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10596 Convert streamio(7I) to mandoc
*** 1,718 ****
STREAMIO(7I) Ioctl Requests STREAMIO(7I)
-
-
NAME
streamio - STREAMS ioctl commands
SYNOPSIS
#include <sys/types.h>
#include <stropts.h>
#include <sys/conf.h>
! int ioctl(int fildes, int command, ... /*arg*/);
-
DESCRIPTION
! STREAMS (see Intro(3)) ioctl commands are a subset of the ioctl(2)
commands and perform a variety of control functions on streams.
-
The fildes argument is an open file descriptor that refers to a stream.
The command argument determines the control function to be performed as
! described below. The arg argument represents additional information
! that is needed by this command. The type of arg depends upon the
! command, but it is generally an integer or a pointer to a command-
! specific data structure. The command and arg arguments are interpreted
! by the STREAM head. Certain combinations of these arguments may be
! passed to a module or driver in the stream.
-
Since these STREAMS commands are ioctls, they are subject to the errors
described in ioctl(2). In addition to those errors, the call will fail
with errno set to EINVAL, without processing a control function, if the
! STREAM referenced by fildes is linked below a multiplexor, or if
! command is not a valid value for a stream.
-
Also, as described in ioctl(2), STREAMS modules and drivers can detect
! errors. In this case, the module or driver sends an error message to
! the STREAM head containing an error value. This causes subsequent calls
! to fail with errno set to this value.
IOCTLS
! The following ioctl commands, with error values indicated, are
applicable to all STREAMS files:
! I_PUSH
! Pushes the module whose name is pointed to by arg onto
! the top of the current stream, just below the STREAM
! head. If the STREAM is a pipe, the module will be
! inserted between the stream heads of both ends of the
! pipe. It then calls the open routine of the newly-pushed
! module. On failure, errno is set to one of the following
! values:
! EINVAL
! Invalid module name.
! EFAULT
! arg points outside the allocated address
! space.
! ENXIO
! Open routine of new module failed.
! ENXIO
! Hangup received on fildes.
! ENOTSUP
! Pushing a module is not supported on this
! stream.
!
! I_POP
! Removes the module just below the STREAM head of the
! STREAM pointed to by fildes. To remove a module from a
! pipe requires that the module was pushed on the side it
! is being removed from. arg should be 0 in an I_POP
! request. On failure, errno is set to one of the
! following values:
!
! EINVAL
! No module present in the stream.
!
!
! ENXIO
! Hangup received on fildes.
!
!
! EPERM
! Attempt to pop through an anchor by an
! unprivileged process.
!
!
! ENOTSUP
! Removal is not supported.
!
!
!
! I_ANCHOR
! Positions the stream anchor to be at the stream's module
directly below the stream head. Once this has been done,
! only a privileged process may pop modules below the
! anchor on the stream. arg must be 0 in an I_ANCHOR
! request. On failure, errno is set to the following
! value:
! EINVAL
! Request to put an anchor on a pipe.
! I_LOOK
! Retrieves the name of the module just below the stream
! head of the stream pointed to by fildes, and places it
! in a null terminated character string pointed at by arg.
! The buffer pointed to by arg should be at least
! FMNAMESZ+1 bytes long. This requires the declaration
! #include <sys/conf.h>. On failure, errno is set to one
! of the following values:
! EFAULT
! arg points outside the allocated address
! space.
!
!
! EINVAL
! No module present in stream.
!
!
!
! I_FLUSH
! This request flushes all input and/or output queues,
depending on the value of arg. Legal arg values are:
! FLUSHR
! Flush read queues.
! FLUSHW
! Flush write queues.
! FLUSHRW
! Flush read and write queues.
! If a pipe or FIFO does not have any modules pushed, the
! read queue of the stream head on either end is flushed
! depending on the value of arg.
! If FLUSHR is set and fildes is a pipe, the read queue
! for that end of the pipe is flushed and the write queue
! for the other end is flushed. If fildes is a FIFO, both
! queues are flushed.
! If FLUSHW is set and fildes is a pipe and the other end
! of the pipe exists, the read queue for the other end of
! the pipe is flushed and the write queue for this end is
! flushed. If fildes is a FIFO, both queues of the FIFO
! are flushed.
- If FLUSHRW is set, all read queues are flushed, that is,
- the read queue for the FIFO and the read queue on both
- ends of the pipe are flushed.
-
- Correct flush handling of a pipe or FIFO with modules
- pushed is achieved via the pipemod module. This module
- should be the first module pushed onto a pipe so that it
- is at the midpoint of the pipe itself.
-
On failure, errno is set to one of the following values:
! ENOSR
! Unable to allocate buffers for flush message
! due to insufficient stream memory resources.
! EINVAL
! Invalid arg value.
!
! ENXIO
! Hangup received on fildes.
!
!
!
! I_FLUSHBAND
! Flushes a particular band of messages. arg points to a
bandinfo structure that has the following members:
unsigned char bi_pri;
int bi_flag;
! The bi_flag field may be one of FLUSHR, FLUSHW, or
! FLUSHRW as described earlier.
! I_SETSIG
! Informs the stream head that the user wishes the kernel
! to issue the SIGPOLL signal (see signal(3C)) when a
! particular event has occurred on the stream associated
! with fildes. I_SETSIG supports an asynchronous
! processing capability in streams. The value of arg is a
! bitmask that specifies the events for which the user
! should be signaled. It is the bitwise OR of any
! combination of the following constants:
! S_INPUT
! Any message other than an M_PCPROTO has
! arrived on a stream head read queue. This
! event is maintained for compatibility with
! previous releases. This event is triggered
! even if the message is of zero length.
! S_RDNORM
! An ordinary (non-priority) message has
! arrived on a stream head read queue. This
! event is triggered even if the message is
! of zero length.
!
! S_RDBAND
! A priority band message (band > 0) has
! arrived on a stream head read queue. This
! event is triggered even if the message is
! of zero length.
!
!
! S_HIPRI
! A high priority message is present on the
! stream head read queue. This event is
! triggered even if the message is of zero
! length.
!
!
! S_OUTPUT
! The write queue just below the stream head
! is no longer full. This notifies the user
! that there is room on the queue for sending
! (or writing) data downstream.
!
!
! S_WRNORM
! This event is the same as S_OUTPUT.
!
!
! S_WRBAND
! A priority band greater than 0 of a queue
! downstream exists and is writable. This
! notifies the user that there is room on the
! queue for sending (or writing) priority
data downstream.
! S_MSG
! A STREAMS signal message that contains the
SIGPOLL signal has reached the front of the
stream head read queue.
! S_ERROR
! An M_ERROR message has reached the stream
! head.
- S_HANGUP
- An M_HANGUP message has reached the stream
- head.
-
-
- S_BANDURG
- When used in conjunction with S_RDBAND,
- SIGURG is generated instead of SIGPOLL when
- a priority message reaches the front of the
- stream head read queue.
-
A user process may choose to be signaled only of high
! priority messages by setting the arg bitmask to the
! value S_HIPRI.
Processes that wish to receive SIGPOLL signals must
explicitly register to receive them using I_SETSIG. If
! several processes register to receive this signal for
! the same event on the same stream, each process will be
! signaled when the event occurs.
If the value of arg is zero, the calling process will be
! unregistered and will not receive further SIGPOLL
! signals. On failure, errno is set to one of the
! following values:
! EINVAL
! arg value is invalid or arg is zero and
! process is not registered to receive the
! SIGPOLL signal.
! EAGAIN
! Allocation of a data structure to store the
! signal request failed.
!
!
!
! I_GETSIG
! Returns the events for which the calling process is
currently registered to be sent a SIGPOLL signal. The
! events are returned as a bitmask pointed to by arg,
! where the events are those specified in the description
! of I_SETSIG above. On failure, errno is set to one of
! the following values:
! EINVAL
! Process not registered to receive the SIGPOLL
signal.
! EFAULT
! arg points outside the allocated address
! space.
! I_FIND
! Compares the names of all modules currently present in
! the stream to the name pointed to by arg, and returns 1
! if the named module is present in the stream. It returns
! 0 if the named module is not present. On failure, errno
! is set to one of the following values:
!
! EFAULT
! arg points outside the allocated address
! space.
!
!
! EINVAL
! arg does not contain a valid module name.
!
!
!
! I_PEEK
! Allows a user to retrieve the information in the first
message on the stream head read queue without taking the
message off the queue. I_PEEK is analogous to getmsg(2)
! except that it does not remove the message from the
! queue. arg points to a strpeek structure, which contains
! the following members:
struct strbuf ctlbuf;
struct strbuf databuf;
long flags;
! The maxlen field in the ctlbuf and databuf strbuf
! structures (see getmsg(2)) must be set to the number of
! bytes of control information and/or data information,
! respectively, to retrieve. flags may be set to RS_HIPRI
! or 0. If RS_HIPRI is set, I_PEEK will look for a high
! priority message on the stream head read queue.
! Otherwise, I_PEEK will look for the first message on the
! stream head read queue.
! I_PEEK returns 1 if a message was retrieved, and returns
! 0 if no message was found on the stream head read queue.
! It does not wait for a message to arrive. On return,
! ctlbuf specifies information in the control buffer,
! databuf specifies information in the data buffer, and
! flags contains the value RS_HIPRI or 0. On failure,
! errno is set to the following value:
! EFAULT
! arg points, or the buffer area specified in
! ctlbuf or databuf is, outside the allocated
! address space.
! EBADMSG
! Queued message to be read is not valid for
! I_PEEK.
! EINVAL
! Illegal value for flags.
!
!
! ENOSR
! Unable to allocate buffers to perform the
! I_PEEK due to insufficient STREAMS memory
! resources.
!
!
!
! I_SRDOPT
! Sets the read mode (see read(2)) using the value of the
argument arg. Legal arg values are:
! RNORM
! Byte-stream mode, the default.
! RMSGD
! Message-discard mode.
! RMSGN
! Message-nondiscard mode.
! In addition, the stream head's treatment of control
! messages may be changed by setting the following flags
! in arg:
! RPROTNORM
! Reject read() with EBADMSG if a control
! message is at the front of the stream head
! read queue.
! RPROTDAT
! Deliver the control portion of a message as
! data when a user issues read(). This is the
! default behavior.
!
! RPROTDIS
! Discard the control portion of a message,
! delivering any data portion, when a user
! issues a read().
!
On failure, errno is set to the following value:
! EINVAL
! arg is not one of the above legal values, or
! arg is the bitwise inclusive OR of RMSGD and
! RMSGN.
! I_GRDOPT
! Returns the current read mode setting in an int pointed
! to by the argument arg. Read modes are described in
! read(). On failure, errno is set to the following value:
! EFAULT
! arg points outside the allocated address
! space.
-
-
- I_NREAD
- Counts the number of data bytes in data blocks in the
- first message on the stream head read queue, and places
- this value in the location pointed to by arg. The return
- value for the command is the number of messages on the
- stream head read queue. For example, if zero is returned
- in arg, but the ioctl return value is greater than zero,
- this indicates that a zero-length message is next on the
- queue. On failure, errno is set to the following value:
-
- EFAULT
- arg points outside the allocated address
- space.
-
-
-
- I_FDINSERT
- Creates a message from specified buffer(s), adds
- information about another stream and sends the message
- downstream. The message contains a control part and an
- optional data part. The data and control parts to be
- sent are distinguished by placement in separate buffers,
- as described below.
-
- The arg argument points to a strfdinsert structure,
- which contains the following members:
-
struct strbuf ctlbuf;
struct strbuf databuf;
t_uscalar_t flags;
int fildes;
int offset;
The len member in the ctlbuf strbuf structure (see
! putmsg(2)) must be set to the size of a t_uscalar_t
! plus the number of bytes of control information to be
! sent with the message. The fildes member specifies the
! file descriptor of the other stream, and the offset
! member, which must be suitably aligned for use as a
! t_uscalar_t, specifies the offset from the start of the
! control buffer where I_FDINSERT will store a t_uscalar_t
! whose interpretation is specific to the stream end. The
! len member in the databuf strbuf structure must be set
! to the number of bytes of data information to be sent
! with the message, or to 0 if no data part is to be sent.
The flags member specifies the type of message to be
! created. A normal message is created if flags is set to
! 0, and a high-priority message is created if flags is
! set to RS_HIPRI. For non-priority messages, I_FDINSERT
! will block if the stream write queue is full due to
! internal flow control conditions. For priority messages,
! I_FDINSERT does not block on this condition. For non-
! priority messages, I_FDINSERT does not block when the
! write queue is full and O_NDELAY or O_NONBLOCK is set.
! Instead, it fails and sets errno to EAGAIN.
! I_FDINSERT also blocks, unless prevented by lack of
! internal resources, waiting for the availability of
! message blocks in the stream, regardless of priority or
! whether O_NDELAY or O_NONBLOCK has been specified. No
! partial message is sent.
! The ioctl() function with the I_FDINSERT command will
! fail if:
! EAGAIN
! A non-priority message is specified, the
! O_NDELAY or O_NONBLOCK flag is set, and the
! stream write queue is full due to internal
! flow control conditions.
! ENOSR
! Buffers can not be allocated for the message
! that is to be created.
!
!
! EFAULT
! The arg argument points, or the buffer area
specified in ctlbuf or databuf is, outside the
allocated address space.
! EINVAL
! One of the following: The fildes member of the
! strfdinsert structure is not a valid, open
! stream file descriptor; the size of a
! t_uscalar_t plus offset is greater than the
! len member for the buffer specified through
! ctlptr; the offset member does not specify a
! properly-aligned location in the data buffer;
! or an undefined value is stored in flags.
!
! ENXIO
! Hangup received on the fildes argument of the
! ioctl call or the fildes member of the
! strfdinsert structure.
!
!
! ERANGE
! The len field for the buffer specified through
! databuf does not fall within the range
! specified by the maximum and minimum packet
! sizes of the topmost stream module; or the len
! member for the buffer specified through
! databuf is larger than the maximum configured
! size of the data part of a message; or the len
! member for the buffer specified through ctlbuf
! is larger than the maximum configured size of
the control part of a message.
! I_FDINSERT can also fail if an error message was
! received by the stream head of the stream corresponding
! to the fildes member of the strfdinsert structure. In
! this case, errno will be set to the value in the
! message.
! I_STR
! Constructs an internal STREAMS ioctl message from the
! data pointed to by arg, and sends that message
! downstream.
! This mechanism is provided to send user ioctl requests
! to downstream modules and drivers. It allows information
! to be sent with the ioctl, and will return to the user
! any information sent upstream by the downstream
! recipient. I_STR blocks until the system responds with
! either a positive or negative acknowledgement message,
! or until the request times out after some period of
! time. If the request times out, it fails with errno set
! to ETIME.
- To send requests downstream, arg must point to a
- strioctl structure which contains the following members:
-
int ic_cmd;
int ic_timout;
int ic_len;
char *ic_dp;
! ic_cmd is the internal ioctl command intended for a
! downstream module or driver and ic_timout is the number
! of seconds (-1 = infinite, 0 = use default, >0 = as
! specified) an I_STR request will wait for
! acknowledgement before timing out. ic_len is the number
! of bytes in the data argument and ic_dp is a pointer to
! the data argument. The ic_len field has two uses: on
! input, it contains the length of the data argument
! passed in, and on return from the command, it contains
! the number of bytes being returned to the user (the
! buffer pointed to by ic_dp should be large enough to
! contain the maximum amount of data that any module or
! the driver in the stream can return).
! At most one I_STR can be active on a stream. Further
! I_STR calls will block until the active I_STR completes
! via a positive or negative acknowlegment, a timeout,
! or an error condition at the stream head. By setting
! the ic_timout field to 0, the user is requesting
! STREAMS to provide the DEFAULT timeout. The default
! timeout is specific to the STREAMS implementation and
! may vary depending on which release of Solaris you are
! using. For Solaris 8 (and earlier versions), the default
! timeout is fifteen seconds. The O_NDELAY and O_NONBLOCK
! (see open(2)) flags have no effect on this call.
! The stream head will convert the information pointed to
! by the strioctl structure to an internal ioctl command
! message and send it downstream. On failure, errno is set
! to one of the following values:
! ENOSR
! Unable to allocate buffers for the ioctl
! message due to insufficient STREAMS memory
! resources.
! EFAULT
! Either arg points outside the allocated
! address space, or the buffer area specified by
! ic_dp and ic_len (separately for data sent and
! data returned) is outside the allocated
! address space.
! EINVAL
! ic_len is less than 0 or ic_len is larger than
! the maximum configured size of the data part
! of a message or ic_timout is less than -1.
!
!
! ENXIO
! Hangup received on fildes.
!
!
! ETIME
! A downstream ioctl timed out before
acknowledgement was received.
! An I_STR can also fail while waiting for an
! acknowledgement if a message indicating an error or a
! hangup is received at the stream head. In addition, an
! error code can be returned in the positive or negative
! acknowledgement message, in the event the ioctl command
! sent downstream fails. For these cases, I_STR will fail
! with errno set to the value in the message.
!
! I_SWROPT
! Sets the write mode using the value of the argument arg.
Legal bit settings for arg are:
! SNDZERO
! Send a zero-length message downstream when a
! write of 0 bytes occurs.
! To not send a zero-length message when a write of 0
! bytes occurs, this bit must not be set in arg.
On failure, errno may be set to the following value:
! EINVAL
! arg is not the above legal value.
- I_GWROPT
- Returns the current write mode setting, as described
- above, in the int that is pointed to by the argument
- arg.
-
-
- I_SENDFD
- Requests the stream associated with fildes to send a
- message, containing a file pointer, to the stream head
- at the other end of a stream pipe. The file pointer
- corresponds to arg, which must be an open file
- descriptor.
-
I_SENDFD converts arg into the corresponding system file
! pointer. It allocates a message block and inserts the
! file pointer in the block. The user id and group id
! associated with the sending process are also inserted.
! This message is placed directly on the read queue (see
! Intro(3)) of the stream head at the other end of the
! stream pipe to which it is connected. On failure, errno
! is set to one of the following values:
! EAGAIN
! The sending stream is unable to allocate a
! message block to contain the file pointer.
! EAGAIN
! The read queue of the receiving stream head is
! full and cannot accept the message sent by
! I_SENDFD.
EBADF
arg is not a valid, open file descriptor.
--- 1,522 ----
STREAMIO(7I) Ioctl Requests STREAMIO(7I)
NAME
streamio - STREAMS ioctl commands
SYNOPSIS
#include <sys/types.h>
#include <stropts.h>
#include <sys/conf.h>
! int
! ioctl(int fildes, int command, ... /*arg*/);
DESCRIPTION
! STREAMS (see Intro(3)) ioctl() commands are a subset of the ioctl(2)
commands and perform a variety of control functions on streams.
The fildes argument is an open file descriptor that refers to a stream.
The command argument determines the control function to be performed as
! described below. The arg argument represents additional information that
! is needed by this command. The type of arg depends upon the command, but
! it is generally an integer or a pointer to a command-specific data
! structure. The command and arg arguments are interpreted by the STREAM
! head. Certain combinations of these arguments may be passed to a module
! or driver in the stream.
Since these STREAMS commands are ioctls, they are subject to the errors
described in ioctl(2). In addition to those errors, the call will fail
with errno set to EINVAL, without processing a control function, if the
! STREAM referenced by fildes is linked below a multiplexor, or if command
! is not a valid value for a stream.
Also, as described in ioctl(2), STREAMS modules and drivers can detect
! errors. In this case, the module or driver sends an error message to the
! STREAM head containing an error value. This causes subsequent calls to
! fail with errno set to this value.
IOCTLS
! The following ioctl() commands, with error values indicated, are
applicable to all STREAMS files:
! I_PUSH Pushes the module whose name is pointed to by arg onto the
! top of the current stream, just below the STREAM head. If
! the STREAM is a pipe, the module will be inserted between
! the stream heads of both ends of the pipe. It then calls
! the open routine of the newly-pushed module. On failure,
! errno is set to one of the following values:
! EINVAL Invalid module name.
+ EFAULT arg points outside the allocated address space.
! ENXIO Open routine of new module failed.
+ ENXIO Hangup received on fildes.
! ENOTSUP Pushing a module is not supported on this stream.
+ I_POP Removes the module just below the STREAM head of the STREAM
+ pointed to by fildes. To remove a module from a pipe
+ requires that the module was pushed on the side it is being
+ removed from. arg should be 0 in an I_POP request. On
+ failure, errno is set to one of the following values:
! EINVAL No module present in the stream.
+ ENXIO Hangup received on fildes.
! EPERM Attempt to pop through an anchor by an unprivileged
! process.
+ ENOTSUP Removal is not supported.
! I_ANCHOR Positions the stream anchor to be at the stream's module
directly below the stream head. Once this has been done,
! only a privileged process may pop modules below the anchor
! on the stream. arg must be 0 in an I_ANCHOR request. On
! failure, errno is set to the following value:
! EINVAL Request to put an anchor on a pipe.
+ I_LOOK Retrieves the name of the module just below the stream head
+ of the stream pointed to by fildes, and places it in a null
+ terminated character string pointed at by arg. The buffer
+ pointed to by arg should be at least FMNAMESZ+1 bytes long.
+ This requires the declaration `#include <sys/conf.h>'. On
+ failure, errno is set to one of the following values:
+ EFAULT arg points outside the allocated address space.
! EINVAL No module present in stream.
! I_FLUSH This request flushes all input and/or output queues,
depending on the value of arg. Legal arg values are:
! FLUSHR Flush read queues.
+ FLUSHW Flush write queues.
! FLUSHRW Flush read and write queues.
+ If a pipe or FIFO does not have any modules pushed, the read
+ queue of the stream head on either end is flushed depending
+ on the value of arg.
! If FLUSHR is set and fildes is a pipe, the read queue for
! that end of the pipe is flushed and the write queue for the
! other end is flushed. If fildes is a FIFO, both queues are
! flushed.
! If FLUSHW is set and fildes is a pipe and the other end of
! the pipe exists, the read queue for the other end of the
! pipe is flushed and the write queue for this end is flushed.
! If fildes is a FIFO, both queues of the FIFO are flushed.
! If FLUSHRW is set, all read queues are flushed, that is, the
! read queue for the FIFO and the read queue on both ends of
! the pipe are flushed.
! Correct flush handling of a pipe or FIFO with modules pushed
! is achieved via the pipemod module. This module should be
! the first module pushed onto a pipe so that it is at the
! midpoint of the pipe itself.
On failure, errno is set to one of the following values:
! ENOSR Unable to allocate buffers for flush message due to
! insufficient stream memory resources.
+ EINVAL Invalid arg value.
! ENXIO Hangup received on fildes.
! I_FLUSHBAND Flushes a particular band of messages. arg points to a
bandinfo structure that has the following members:
unsigned char bi_pri;
int bi_flag;
! The bi_flag field may be one of FLUSHR, FLUSHW, or FLUSHRW
! as described earlier.
+ I_SETSIG Informs the stream head that the user wishes the kernel to
+ issue the SIGPOLL signal (see signal(3C)) when a particular
+ event has occurred on the stream associated with fildes.
+ I_SETSIG supports an asynchronous processing capability in
+ streams. The value of arg is a bitmask that specifies the
+ events for which the user should be signaled. It is the
+ bitwise OR of any combination of the following constants:
! S_INPUT Any message other than an M_PCPROTO has arrived
! on a stream head read queue. This event is
! maintained for compatibility with previous
! releases. This event is triggered even if the
! message is of zero length.
! S_RDNORM An ordinary (non-priority) message has arrived on
! a stream head read queue. This event is
! triggered even if the message is of zero length.
+ S_RDBAND A priority band message (band > 0) has arrived on
+ a stream head read queue. This event is
+ triggered even if the message is of zero length.
! S_HIPRI A high priority message is present on the stream
! head read queue. This event is triggered even if
! the message is of zero length.
! S_OUTPUT The write queue just below the stream head is no
! longer full. This notifies the user that there
! is room on the queue for sending (or writing)
data downstream.
+ S_WRNORM This event is the same as S_OUTPUT.
! S_WRBAND A priority band greater than 0 of a queue
! downstream exists and is writable. This notifies
! the user that there is room on the queue for
! sending (or writing) priority data downstream.
!
! S_MSG A STREAMS signal message that contains the
SIGPOLL signal has reached the front of the
stream head read queue.
+ S_ERROR An M_ERROR message has reached the stream head.
! S_HANGUP An M_HANGUP message has reached the stream head.
+ S_BANDURG When used in conjunction with S_RDBAND, SIGURG is
+ generated instead of SIGPOLL when a priority
+ message reaches the front of the stream head read
+ queue.
A user process may choose to be signaled only of high
! priority messages by setting the arg bitmask to the value
! S_HIPRI.
Processes that wish to receive SIGPOLL signals must
explicitly register to receive them using I_SETSIG. If
! several processes register to receive this signal for the
! same event on the same stream, each process will be signaled
! when the event occurs.
If the value of arg is zero, the calling process will be
! unregistered and will not receive further SIGPOLL signals.
! On failure, errno is set to one of the following values:
! EINVAL arg value is invalid or arg is zero and process is
! not registered to receive the SIGPOLL signal.
+ EAGAIN Allocation of a data structure to store the signal
+ request failed.
! I_GETSIG Returns the events for which the calling process is
currently registered to be sent a SIGPOLL signal. The
! events are returned as a bitmask pointed to by arg, where
! the events are those specified in the description of
! I_SETSIG above. On failure, errno is set to one of the
! following values:
! EINVAL Process not registered to receive the SIGPOLL
signal.
+ EFAULT arg points outside the allocated address space.
! I_FIND Compares the names of all modules currently present in the
! stream to the name pointed to by arg, and returns 1 if the
! named module is present in the stream. It returns 0 if the
! named module is not present. On failure, errno is set to
! one of the following values:
+ EFAULT arg points outside the allocated address space.
+ EINVAL arg does not contain a valid module name.
! I_PEEK Allows a user to retrieve the information in the first
message on the stream head read queue without taking the
message off the queue. I_PEEK is analogous to getmsg(2)
! except that it does not remove the message from the queue.
! arg points to a strpeek structure, which contains the
! following members:
struct strbuf ctlbuf;
struct strbuf databuf;
long flags;
! The maxlen field in the ctlbuf and databuf strbuf structures
! (see getmsg(2)) must be set to the number of bytes of
! control information and/or data information, respectively,
! to retrieve. flags may be set to RS_HIPRI or 0. If
! RS_HIPRI is set, I_PEEK will look for a high priority
! message on the stream head read queue. Otherwise, I_PEEK
! will look for the first message on the stream head read
! queue.
! I_PEEK returns 1 if a message was retrieved, and returns 0
! if no message was found on the stream head read queue. It
! does not wait for a message to arrive. On return, ctlbuf
! specifies information in the control buffer, databuf
! specifies information in the data buffer, and flags contains
! the value RS_HIPRI or 0. On failure, errno is set to the
! following value:
! EFAULT arg points, or the buffer area specified in ctlbuf
! or databuf is, outside the allocated address space.
+ EBADMSG Queued message to be read is not valid for I_PEEK.
! EINVAL Illegal value for flags.
+ ENOSR Unable to allocate buffers to perform the I_PEEK
+ due to insufficient STREAMS memory resources.
! I_SRDOPT Sets the read mode (see read(2)) using the value of the
argument arg. Legal arg values are:
! RNORM Byte-stream mode, the default.
+ RMSGD Message-discard mode.
! RMSGN Message-nondiscard mode.
+ In addition, the stream head's treatment of control messages
+ may be changed by setting the following flags in arg:
! RPROTNORM Reject read(2) with EBADMSG if a control message
! is at the front of the stream head read queue.
! RPROTDAT Deliver the control portion of a message as data
! when a user issues read(2). This is the default
! behavior.
! RPROTDIS Discard the control portion of a message,
! delivering any data portion, when a user issues a
! read(2).
+ On failure, errno is set to the following value:
! EINVAL arg is not one of the above legal values, or arg is
! the bitwise inclusive OR of RMSGD and RMSGN.
! I_GRDOPT Returns the current read mode setting in an int pointed to
! by the argument arg. Read modes are described in read(2).
On failure, errno is set to the following value:
! EFAULT arg points outside the allocated address space.
+ I_NREAD Counts the number of data bytes in data blocks in the first
+ message on the stream head read queue, and places this value
+ in the location pointed to by arg. The return value for the
+ command is the number of messages on the stream head read
+ queue. For example, if zero is returned in arg, but the
+ ioctl() return value is greater than zero, this indicates
+ that a zero-length message is next on the queue. On
+ failure, errno is set to the following value:
+ EFAULT arg points outside the allocated address space.
! I_FDINSERT Creates a message from specified buffer(s), adds information
! about another stream and sends the message downstream. The
! message contains a control part and an optional data part.
! The data and control parts to be sent are distinguished by
! placement in separate buffers, as described below.
! The arg argument points to a strfdinsert structure, which
! contains the following members:
struct strbuf ctlbuf;
struct strbuf databuf;
t_uscalar_t flags;
int fildes;
int offset;
The len member in the ctlbuf strbuf structure (see
! putmsg(2)) must be set to the size of a t_uscalar_t plus the
! number of bytes of control information to be sent with the
! message. The fildes member specifies the file descriptor of
! the other stream, and the offset member, which must be
! suitably aligned for use as a t_uscalar_t, specifies the
! offset from the start of the control buffer where I_FDINSERT
! will store a t_uscalar_t whose interpretation is specific to
! the stream end. The len member in the databuf strbuf
! structure must be set to the number of bytes of data
! information to be sent with the message, or to 0 if no data
! part is to be sent.
The flags member specifies the type of message to be
! created. A normal message is created if flags is set to 0,
! and a high-priority message is created if flags is set to
! RS_HIPRI. For non-priority messages, I_FDINSERT will block
! if the stream write queue is full due to internal flow
! control conditions. For priority messages, I_FDINSERT does
! not block on this condition. or non-priority messages,
! I_FDINSERT does not block when the write queue is full and
! O_NDELAY or O_NONBLOCK is set. Instead, it fails and sets
! errno to EAGAIN.
! I_FDINSERT also blocks, unless prevented by lack of internal
! resources, waiting for the availability of message blocks in
! the stream, regardless of priority or whether O_NDELAY or
! O_NONBLOCK has been specified. No partial message is sent.
! The ioctl() function with the I_FDINSERT command will fail
! if:
! EAGAIN A non-priority message is specified, the O_NDELAY or
! O_NONBLOCK flag is set, and the stream write queue
! is full due to internal flow control conditions.
+ ENOSR Buffers can not be allocated for the message that is
+ to be created.
! EFAULT The arg argument points, or the buffer area
specified in ctlbuf or databuf is, outside the
allocated address space.
+ EINVAL One of the following: The fildes member of the
+ strfdinsert structure is not a valid, open stream
+ file descriptor; the size of a t_uscalar_t plus
+ offset is greater than the len member for the buffer
+ specified through ctlptr; the offset member does not
+ specify a properly-aligned location in the data
+ buffer; or an undefined value is stored in flags.
! ENXIO Hangup received on the fildes argument of the
! ioctl() call or the fildes member of the strfdinsert
! structure.
! ERANGE The len field for the buffer specified through
! databuf does not fall within the range specified by
! the maximum and minimum packet sizes of the topmost
! stream module; or the len member for the buffer
! specified through databuf is larger than the maximum
! configured size of the data part of a message; or
! the len member for the buffer specified through
! ctlbuf is larger than the maximum configured size of
the control part of a message.
! I_FDINSERT can also fail if an error message was received by
! the stream head of the stream corresponding to the fildes
! member of the strfdinsert structure. In this case, errno
! will be set to the value in the message.
+ I_STR Constructs an internal STREAMS ioctl message from the data
+ pointed to by arg, and sends that message downstream.
! This mechanism is provided to send user ioctl() requests to
! downstream modules and drivers. It allows information to be
! sent with the ioctl(), and will return to the user any
! information sent upstream by the downstream recipient.
! I_STR blocks until the system responds with either a
! positive or negative acknowledgement message, or until the
! request times out after some period of time. If the request
! times out, it fails with errno set to ETIME.
! To send requests downstream, arg must point to a strioctl
! structure which contains the following members:
int ic_cmd;
int ic_timout;
int ic_len;
char *ic_dp;
! ic_cmd is the internal ioctl() command intended for a
! downstream module or driver and ic_timout is the number of
! seconds (-1 = infinite, 0 = use default, >0 = as specified)
! an I_STR request will wait for acknowledgement before timing
! out. ic_len is the number of bytes in the data argument and
! ic_dp is a pointer to the data argument. The ic_len field
! has two uses: on input, it contains the length of the data
! argument passed in, and on return from the command, it
! contains the number of bytes being returned to the user (the
! buffer pointed to by ic_dp should be large enough to contain
! the maximum amount of data that any module or the driver in
! the stream can return).
! At most one I_STR can be active on a stream. Further I_STR
! calls will block until the active I_STR completes via a
! positive or negative acknowlegment, a timeout, or an error
! condition at the stream head. By setting the ic_timout
! field to 0, the user is requesting STREAMS to provide the
! DEFAULT timeout. The default timeout is specific to the
! STREAMS implementation and may vary depending on which
! release of Solaris you are using. For Solaris 8 (and
! earlier versions), the default timeout is fifteen seconds.
! The O_NDELAY and O_NONBLOCK (see open(2)) flags have no
! effect on this call.
! The stream head will convert the information pointed to by
! the strioctl structure to an internal ioctl() command
! message and send it downstream. On failure, errno is set to
! one of the following values:
! ENOSR Unable to allocate buffers for the ioctl() message
! due to insufficient STREAMS memory resources.
+ EFAULT Either arg points outside the allocated address
+ space, or the buffer area specified by ic_dp and
+ ic_len (separately for data sent and data returned)
+ is outside the allocated address space.
! EINVAL ic_len is less than 0 or ic_len is larger than the
! maximum configured size of the data part of a
! message or ic_timout is less than -1.
+ ENXIO Hangup received on fildes.
! ETIME A downstream ioctl() timed out before
acknowledgement was received.
! An I_STR can also fail while waiting for an acknowledgement
! if a message indicating an error or a hangup is received at
! the stream head. In addition, an error code can be returned
! in the positive or negative acknowledgement message, in the
! event the ioctl command sent downstream fails. For these
! cases, I_STR will fail with errno set to the value in the
! message.
! I_SWROPT Sets the write mode using the value of the argument arg.
Legal bit settings for arg are:
! SNDZERO Send a zero-length message downstream when a write
! of 0 bytes occurs.
! To not send a zero-length message when a write of 0 bytes
! occurs, this bit must not be set in arg.
On failure, errno may be set to the following value:
! EINVAL arg is not the above legal value.
+ I_GWROPT Returns the current write mode setting, as described above,
+ in the int that is pointed to by the argument arg.
+ I_SENDFD Requests the stream associated with fildes to send a
+ message, containing a file pointer, to the stream head at
+ the other end of a stream pipe. The file pointer
+ corresponds to arg, which must be an open file descriptor.
I_SENDFD converts arg into the corresponding system file
! pointer. It allocates a message block and inserts the file
! pointer in the block. The user id and group id associated
! with the sending process are also inserted. This message is
! placed directly on the read queue (see Intro(3)) of the
! stream head at the other end of the stream pipe to which it
! is connected. On failure, errno is set to one of the
! following values:
! EAGAIN The sending stream is unable to allocate a message
! block to contain the file pointer.
+ EAGAIN The read queue of the receiving stream head is full
+ and cannot accept the message sent by I_SENDFD.
! EBADF arg is not a valid, open file descriptor.
+ EINVAL fildes is not connected to a stream pipe.
ENXIO Hangup received on fildes.
I_RECVFD Retrieves the file descriptor associated with the message
sent by an I_SENDFD ioctl() over a stream pipe. arg is a
*** 710,803 ****
The read queue of the receiving stream head is
full and cannot accept the message sent by
I_SENDFD.
! EBADF
! arg is not a valid, open file descriptor.
- EINVAL
- fildes is not connected to a stream pipe.
-
-
- ENXIO
- Hangup received on fildes.
-
-
-
- I_RECVFD
- Retrieves the file descriptor associated with the
- message sent by an I_SENDFD ioctl over a stream pipe.
- arg is a pointer to a data buffer large enough to hold
- an strrecvfd data structure containing the following
- members:
-
int fd;
uid_t uid;
gid_t gid;
! fd is an integer file descriptor. uid and gid are the
! user id and group id, respectively, of the sending
! stream.
! If O_NDELAY and O_NONBLOCK are clear (see open(2)),
! I_RECVFD will block until a message is present at the
! stream head. If O_NDELAY or O_NONBLOCK is set, I_RECVFD
! will fail with errno set to EAGAIN if no message is
! present at the stream head.
! If the message at the stream head is a message sent by
! an I_SENDFD, a new user file descriptor is allocated for
! the file pointer contained in the message. The new file
descriptor is placed in the fd field of the strrecvfd
structure. The structure is copied into the user data
! buffer pointed to by arg. On failure, errno is set to
! one of the following values:
! EAGAIN
! A message is not present at the stream head
! read queue, and the O_NDELAY or O_NONBLOCK
! flag is set.
! EBADMSG
! The message at the stream head read queue
! is not a message containing a passed file
! descriptor.
! EFAULT
! arg points outside the allocated address
! space.
!
! EMFILE
! NOFILES file descriptors are currently
! open.
!
!
! ENXIO
! Hangup received on fildes.
!
!
! EOVERFLOW
! uid or gid is too large to be stored in the
structure pointed to by arg.
-
- I_LIST
- Allows the user to list all the module names on the
- stream, up to and including the topmost driver name. If
- arg is NULL, the return value is the number of modules,
- including the driver, that are on the stream pointed to
- by fildes. This allows the user to allocate enough space
- for the module names. If arg is non-null, it should
- point to an str_list structure that has the following
- members:
-
int sl_nmods;
struct str_mlist *sl_modlist;
The str_mlist structure has the following member:
--- 514,575 ----
EBADF arg is not a valid, open file descriptor.
EINVAL fildes is not connected to a stream pipe.
! ENXIO Hangup received on fildes.
+ I_RECVFD Retrieves the file descriptor associated with the message
+ sent by an I_SENDFD ioctl() over a stream pipe. arg is a
+ pointer to a data buffer large enough to hold an strrecvfd
+ data structure containing the following members:
int fd;
uid_t uid;
gid_t gid;
! fd is an integer file descriptor. uid and gid are the user
! id and group id, respectively, of the sending stream.
! If O_NDELAY and O_NONBLOCK are clear (see open(2)), I_RECVFD
! will block until a message is present at the stream head.
! If O_NDELAY or O_NONBLOCK is set, I_RECVFD will fail with
! errno set to EAGAIN if no message is present at the stream
! head.
! If the message at the stream head is a message sent by an
! I_SENDFD, a new user file descriptor is allocated for the
! file pointer contained in the message. The new file
descriptor is placed in the fd field of the strrecvfd
structure. The structure is copied into the user data
! buffer pointed to by arg. On failure, errno is set to one
! of the following values:
! EAGAIN A message is not present at the stream head read
! queue, and the O_NDELAY or O_NONBLOCK flag is
! set.
+ EBADMSG The message at the stream head read queue is not
+ a message containing a passed file descriptor.
! EFAULT arg points outside the allocated address space.
+ EMFILE NOFILES file descriptors are currently open.
! ENXIO Hangup received on fildes.
! EOVERFLOW uid or gid is too large to be stored in the
structure pointed to by arg.
+ I_LIST Allows the user to list all the module names on the stream,
+ up to and including the topmost driver name. If arg is
+ NULL, the return value is the number of modules, including
+ the driver, that are on the stream pointed to by fildes.
+ This allows the user to allocate enough space for the module
+ names. If arg is non-null, it should point to an str_list
+ structure that has the following members:
int sl_nmods;
struct str_mlist *sl_modlist;
The str_mlist structure has the following member:
*** 804,1202 ****
char l_name[FMNAMESZ+1];
The sl_nmods member indicates the number of entries the
process has allocated in the array. Upon return, the
sl_modlist member of the str_list structure contains the
! list of module names, and the number of entries that
! have been filled into the sl_modlist array is found in
! the sl_nmods member (the number includes the number of
! modules including the driver). The return value from
! ioctl() is 0. The entries are filled in starting at the
! top of the stream and continuing downstream until either
! the end of the stream is reached, or the number of
! requested modules (sl_nmods) is satisfied. On failure,
! errno may be set to one of the following values:
! EINVAL
! The sl_nmods member is less than 1.
! EAGAIN
! Unable to allocate buffers
! I_ATMARK
! Allows the user to see if the current message on the
! stream head read queue is ``marked'' by some module
! downstream. arg determines how the checking is done when
! there may be multiple marked messages on the stream head
! read queue. It may take the following values:
! ANYMARK
! Check if the message is marked.
! LASTMARK
! Check if the message is the last one marked
! on the queue.
! The return value is 1 if the mark condition is satisfied
! and 0 otherwise. On failure, errno is set to the
! following value:
! EINVAL
! Invalid arg value.
!
!
! I_CKBAND
! Check if the message of a given priority band exists on
! the stream head read queue. This returns 1 if a message
! of a given priority exists, 0 if not, or -1 on error.
! arg should be an integer containing the value of the
! priority band in question. On failure, errno is set to
! the following value:
!
! EINVAL
! Invalid arg value.
!
!
!
! I_GETBAND
! Returns the priority band of the first message on the
! stream head read queue in the integer referenced by arg.
! On failure, errno is set to the following value:
!
! ENODATA
! No message on the stream head read queue.
!
!
!
! I_CANPUT
! Check if a certain band is writable. arg is set to the
priority band in question. The return value is 0 if the
priority band arg is flow controlled, 1 if the band is
! writable, or -1 on error. On failure, errno is set to
! the following value:
! EINVAL
! Invalid arg value.
! I_SETCLTIME
! Allows the user to set the time the stream head will
! delay when a stream is closing and there are data on the
! write queues. Before closing each module and driver,
! the stream head will delay for the specified amount of
! time to allow the data to drain. Note, however, that the
! module or driver may itself delay in its close routine;
! this delay is independent of the stream head's delay and
! is not settable. If, after the delay, data are still
! present, data will be flushed. arg is a pointer to an
! integer containing the number of milliseconds to delay,
! rounded up to the nearest legal value on the system.
! The default is fifteen seconds. On failure, errno is set
! to the following value:
! EINVAL
! Invalid arg value.
! I_GETCLTIME
! Returns the close time delay in the integer pointed by
! arg.
-
- I_SERROPT
- Sets the error mode using the value of the argument arg.
-
- Normally stream head errors are persistent; once they
- are set due to an M_ERROR or M_HANGUP, the error
- condition will remain until the stream is closed. This
- option can be used to set the stream head into non-
- persistent error mode i.e. once the error has been
- returned in response to a read(2), getmsg(2), ioctl(2),
- write(2), or putmsg(2) call the error condition will be
- cleared. The error mode can be controlled independently
- for read and write side errors. Legal arg values are
- either none or one of:
-
- RERRNORM
- Persistent read errors, the default.
-
-
- RERRNONPERSIST
- Non-persistent read errors.
-
OR'ed with either none or one of:
! WERRNORM
! Persistent write errors, the default.
! WERRNONPERSIST
! Non-persistent write errors.
!
! When no value is specified e.g. for
! the read side error behavior then the
! behavior for that side will be left
unchanged.
On failure, errno is set to the following value:
! EINVAL
! arg is not one of the above legal values.
- I_GERROPT
- Returns the current error mode setting in an int pointed
- to by the argument arg. Error modes are described above
- for I_SERROPT. On failure,errno is set to the following
- value:
-
- EFAULT
- arg points outside the allocated address
- space.
-
-
-
-
The following four commands are used for connecting and disconnecting
multiplexed STREAMS configurations.
! I_LINK
! Connects two streams, where fildes is the file descriptor
! of the stream connected to the multiplexing driver, and
! arg is the file descriptor of the stream connected to
! another driver. The stream designated by arg gets
! connected below the multiplexing driver. I_LINK requires
! the multiplexing driver to send an acknowledgement message
! to the stream head regarding the linking operation. This
! call returns a multiplexor ID number (an identifier used
! to disconnect the multiplexor, see I_UNLINK) on success,
! and -1 on failure. On failure, errno is set to one of the
! following values:
! ENXIO
! Hangup received on fildes.
! ETIME
! Time out before acknowledgement message was
! received at stream head.
! EAGAIN
! Temporarily unable to allocate storage to
! perform the I_LINK.
! ENOSR
! Unable to allocate storage to perform the I_LINK
! due to insufficient STREAMS memory resources.
! EBADF
! arg is not a valid, open file descriptor.
- EINVAL
- fildes stream does not support multiplexing.
-
-
- EINVAL
- arg is not a stream, or is already linked under
- a multiplexor.
-
-
- EINVAL
- The specified link operation would cause a
- ``cycle'' in the resulting configuration; that
- is, a driver would be linked into the
- multiplexing configuration in more than one
- place.
-
-
- EINVAL
- fildes is the file descriptor of a pipe or FIFO.
-
-
- EINVAL
- Either the upper or lower stream has a major
- number >= the maximum major number on the
- system.
-
An I_LINK can also fail while waiting for the multiplexing
driver to acknowledge the link request, if a message
! indicating an error or a hangup is received at the stream
! head of fildes. In addition, an error code can be returned
! in the positive or negative acknowledgement message. For
! these cases, I_LINK will fail with errno set to the value
! in the message.
! I_UNLINK
! Disconnects the two streams specified by fildes and arg.
! fildes is the file descriptor of the stream connected to
! the multiplexing driver. arg is the multiplexor ID number
! that was returned by the I_LINK. If arg is -1, then all
! streams that were linked to fildes are disconnected. As
! in I_LINK, this command requires the multiplexing driver
! to acknowledge the unlink. On failure, errno is set to one
! of the following values:
! ENXIO
! Hangup received on fildes.
! ETIME
! Time out before acknowledgement message was
! received at stream head.
! ENOSR
! Unable to allocate storage to perform the
! I_UNLINK due to insufficient STREAMS memory
! resources.
! EINVAL
! arg is an invalid multiplexor ID number or
! fildes is not the stream on which the I_LINK
! that returned arg was performed.
! EINVAL
! fildes is the file descriptor of a pipe or FIFO.
! An I_UNLINK can also fail while waiting for the
! multiplexing driver to acknowledge the link request, if a
! message indicating an error or a hangup is received at the
! stream head of fildes. In addition, an error code can be
! returned in the positive or negative acknowledgement
! message. For these cases, I_UNLINK will fail with errno
! set to the value in the message.
! I_PLINK
! Connects two streams, where fildes is the file descriptor
! of the stream connected to the multiplexing driver, and
! arg is the file descriptor of the stream connected to
! another driver. The stream designated by arg gets
! connected via a persistent link below the multiplexing
! driver. I_PLINK requires the multiplexing driver to send
! an acknowledgement message to the stream head regarding
! the linking operation. This call creates a persistent link
! that continues to exist even if the file descriptor fildes
! associated with the upper stream to the multiplexing
! driver is closed. This call returns a multiplexor ID
! number (an identifier that may be used to disconnect the
! multiplexor, see I_PUNLINK) on success, and -1 on failure.
! On failure, errno is set to one of the following values:
!
! ENXIO
! Hangup received on fildes.
!
!
! ETIME
! Time out before acknowledgement message was
! received at the stream head.
!
!
! EAGAIN
! Unable to allocate STREAMS storage to perform
! the I_PLINK.
!
!
! EBADF
! arg is not a valid, open file descriptor.
!
!
! EINVAL
! fildes does not support multiplexing.
!
!
! EINVAL
! arg is not a stream or is already linked under a
multiplexor.
! EINVAL
! The specified link operation would cause a
! ``cycle'' in the resulting configuration; that
! is, if a driver would be linked into the
! multiplexing configuration in more than one
! place.
! EINVAL
! fildes is the file descriptor of a pipe or FIFO.
! An I_PLINK can also fail while waiting for the
! multiplexing driver to acknowledge the link request, if a
! message indicating an error on a hangup is received at the
! stream head of fildes. In addition, an error code can be
! returned in the positive or negative acknowledgement
! message. For these cases, I_PLINK will fail with errno
! set to the value in the message.
! I_PUNLINK
! Disconnects the two streams specified by fildes and arg
! that are connected with a persistent link. fildes is the
! file descriptor of the stream connected to the
! multiplexing driver. arg is the multiplexor ID number that
! was returned by I_PLINK when a stream was linked below the
! multiplexing driver. If arg is MUXID_ALL then all streams
! that are persistent links to fildes are disconnected. As
! in I_PLINK, this command requires the multiplexing driver
! to acknowledge the unlink. On failure, errno is set to one
! of the following values:
! ENXIO
! Hangup received on fildes.
! ETIME
! Time out before acknowledgement message was
! received at the stream head.
-
- EAGAIN
- Unable to allocate buffers for the
- acknowledgement message.
-
-
- EINVAL
- Invalid multiplexor ID number.
-
-
- EINVAL
- fildes is the file descriptor of a pipe or FIFO.
-
- An I_PUNLINK can also fail while waiting for the
- multiplexing driver to acknowledge the link request if a
- message indicating an error or a hangup is received at the
- stream head of fildes. In addition, an error code can be
- returned in the positive or negative acknowledgement
- message. For these cases, I_PUNLINK will fail with errno
- set to the value in the message.
-
-
RETURN VALUES
! Unless specified otherwise above, the return value from ioctl() is 0
upon success and -1 upon failure, with errno set as indicated.
SEE ALSO
! Intro(3), close(2), fcntl(2), getmsg(2), ioctl(2), open(2), poll(2),
! putmsg(2), read(2), write(2), signal(3C), signal.h(3HEAD),
-
STREAMS Programming Guide
!
!
! April 8, 2009 STREAMIO(7I)
--- 576,852 ----
char l_name[FMNAMESZ+1];
The sl_nmods member indicates the number of entries the
process has allocated in the array. Upon return, the
sl_modlist member of the str_list structure contains the
! list of module names, and the number of entries that have
! been filled into the sl_modlist array is found in the
! sl_nmods member (the number includes the number of modules
! including the driver). The return value from ioctl() is 0.
! The entries are filled in starting at the top of the stream
! and continuing downstream until either the end of the stream
! is reached, or the number of requested modules (sl_nmods) is
! satisfied. On failure, errno may be set to one of the
! following values:
! EINVAL The sl_nmods member is less than 1.
+ EAGAIN Unable to allocate buffers
! I_ATMARK Allows the user to see if the current message on the stream
! head read queue is "marked" by some module downstream. arg
! determines how the checking is done when there may be
! multiple marked messages on the stream head read queue. It
! may take the following values:
+ ANYMARK Check if the message is marked.
+ LASTMARK Check if the message is the last one marked on the
+ queue.
! The return value is 1 if the mark condition is satisfied and
! 0 otherwise. On failure, errno is set to the following
! value:
! EINVAL Invalid arg value.
+ I_CKBAND Check if the message of a given priority band exists on the
+ stream head read queue. This returns 1 if a message of a
+ given priority exists, 0 if not, or -1 on error. arg should
+ be an integer containing the value of the priority band in
+ question. On failure, errno is set to the following value:
! EINVAL Invalid arg value.
! I_GETBAND Returns the priority band of the first message on the stream
! head read queue in the integer referenced by arg. On
! failure, errno is set to the following value:
! ENODATA No message on the stream head read queue.
! I_CANPUT Check if a certain band is writable. arg is set to the
priority band in question. The return value is 0 if the
priority band arg is flow controlled, 1 if the band is
! writable, or -1 on error. On failure, errno is set to the
! following value:
! EINVAL Invalid arg value.
+ I_SETCLTIME Allows the user to set the time the stream head will delay
+ when a stream is closing and there are data on the write
+ queues. Before closing each module and driver, the stream
+ head will delay for the specified amount of time to allow
+ the data to drain. Note, however, that the module or driver
+ may itself delay in its close routine; this delay is
+ independent of the stream head's delay and is not settable.
+ If, after the delay, data are still present, data will be
+ flushed. arg is a pointer to an integer containing the
+ number of milliseconds to delay, rounded up to the nearest
+ legal value on the system. The default is fifteen seconds.
+ On failure, errno is set to the following value:
+ EINVAL Invalid arg value.
! I_GETCLTIME Returns the close time delay in the integer pointed by arg.
! I_SERROPT Sets the error mode using the value of the argument arg.
+ Normally stream head errors are persistent; once they are
+ set due to an M_ERROR or M_HANGUP, the error condition will
+ remain until the stream is closed. This option can be used
+ to set the stream head into non-persistent error mode i.e.
+ once the error has been returned in response to a read(2),
+ getmsg(2), ioctl(2), write(2), or putmsg(2) call the error
+ condition will be cleared. The error mode can be controlled
+ independently for read and write side errors. Legal arg
+ values are either none or one of:
+ RERRNORM Persistent read errors, the default.
! RERRNONPERSIST Non-persistent read errors.
OR'ed with either none or one of:
! WERRNORM Persistent write errors, the default.
+ WERRNONPERSIST Non-persistent write errors.
! When no value is specified e.g. for the read side error
! behavior then the behavior for that side will be left
unchanged.
On failure, errno is set to the following value:
! EINVAL arg is not one of the above legal values.
+ I_GERROPT Returns the current error mode setting in an int pointed to
+ by the argument arg. Error modes are described above for
+ I_SERROPT. On failure, errno is set to the following value:
+ EFAULT arg points outside the allocated address space.
The following four commands are used for connecting and disconnecting
multiplexed STREAMS configurations.
! I_LINK Connects two streams, where fildes is the file descriptor of
! the stream connected to the multiplexing driver, and arg is
! the file descriptor of the stream connected to another driver.
! The stream designated by arg gets connected below the
! multiplexing driver. I_LINK requires the multiplexing driver
! to send an acknowledgement message to the stream head
! regarding the linking operation. This call returns a
! multiplexor ID number (an identifier used to disconnect the
! multiplexor, see I_UNLINK) on success, and -1 on failure. On
! failure, errno is set to one of the following values:
! ENXIO Hangup received on fildes.
+ ETIME Time out before acknowledgement message was received
+ at stream head.
! EAGAIN Temporarily unable to allocate storage to perform the
! I_LINK.
+ ENOSR Unable to allocate storage to perform the I_LINK due
+ to insufficient STREAMS memory resources.
! EBADF arg is not a valid, open file descriptor.
+ EINVAL fildes stream does not support multiplexing.
! EINVAL is not a stream, or is already linked under a
! multiplexor.
+ EINVAL The specified link operation would cause a "cycle" in
+ the resulting configuration; that is, a driver would
+ be linked into the multiplexing configuration in more
+ than one place.
! EINVAL fildes is the file descriptor of a pipe or FIFO.
+ EINVAL Either the upper or lower stream has a major number >=
+ the maximum major number on the system.
An I_LINK can also fail while waiting for the multiplexing
driver to acknowledge the link request, if a message
! indicating an error or a hangup is received at the stream head
! of fildes. In addition, an error code can be returned in the
! positive or negative acknowledgement message. For these
! cases, I_LINK will fail with errno set to the value in the
! message.
+ I_UNLINK Disconnects the two streams specified by fildes and arg.
+ fildes is the file descriptor of the stream connected to the
+ multiplexing driver. arg is the multiplexor ID number that
+ was returned by the I_LINK. If arg is -1, then all streams
+ that were linked to fildes are disconnected. As in I_LINK,
+ this command requires the multiplexing driver to acknowledge
+ the unlink. On failure, errno is set to one of the following
+ values:
! ENXIO Hangup received on fildes.
! ETIME Time out before acknowledgement message was received
! at stream head.
+ ENOSR Unable to allocate storage to perform the I_UNLINK due
+ to insufficient STREAMS memory resources.
! EINVAL arg is an invalid multiplexor ID number or fildes is
! not the stream on which the I_LINK that returned arg
! was performed.
+ EINVAL fildes is the file descriptor of a pipe or FIFO.
! An I_UNLINK can also fail while waiting for the multiplexing
! driver to acknowledge the link request, if a message
! indicating an error or a hangup is received at the stream head
! of fildes. In addition, an error code can be returned in the
! positive or negative acknowledgement message. For these
! cases, I_UNLINK will fail with errno set to the value in the
! message.
+ I_PLINK Connects two streams, where fildes is the file descriptor of
+ the stream connected to the multiplexing driver, and arg is
+ the file descriptor of the stream connected to another driver.
+ The stream designated by arg gets connected via a persistent
+ link below the multiplexing driver. I_PLINK requires the
+ multiplexing driver to send an acknowledgement message to the
+ stream head regarding the linking operation. This call
+ creates a persistent link that continues to exist even if the
+ file descriptor fildes associated with the upper stream to the
+ multiplexing driver is closed. This call returns a
+ multiplexor ID number (an identifier that may be used to
+ disconnect the multiplexor, see I_PUNLINK) on success, and -1
+ on failure. On failure, errno is set to one of the following
+ values:
! ENXIO Hangup received on fildes.
+ ETIME Time out before acknowledgement message was received
+ at the stream head.
! EAGAIN Unable to allocate STREAMS storage to perform the
! I_PLINK.
! EBADF arg is not a valid, open file descriptor.
+ EINVAL fildes does not support multiplexing.
! EINVAL arg is not a stream or is already linked under a
multiplexor.
+ EINVAL The specified link operation would cause a "cycle" in
+ the resulting configuration; that is, if a driver
+ would be linked into the multiplexing configuration in
+ more than one place.
! EINVAL fildes is the file descriptor of a pipe or FIFO.
+ An I_PLINK can also fail while waiting for the multiplexing
+ driver to acknowledge the link request, if a message
+ indicating an error on a hangup is received at the stream head
+ of fildes. In addition, an error code can be returned in the
+ positive or negative acknowledgement message. For these
+ cases, I_PLINK will fail with errno set to the value in the
+ message.
! I_PUNLINK Disconnects the two streams specified by fildes and arg that
! are connected with a persistent link. fildes is the file
! descriptor of the stream connected to the multiplexing driver.
! arg is the multiplexor ID number that was returned by I_PLINK
! when a stream was linked below the multiplexing driver. If
! arg is MUXID_ALL then all streams that are persistent links to
! fildes are disconnected. As in I_PLINK, this command requires
! the multiplexing driver to acknowledge the unlink. On
! failure, errno is set to one of the following values:
! ENXIO Hangup received on fildes.
+ ETIME Time out before acknowledgement message was received
+ at the stream head.
! EAGAIN Unable to allocate buffers for the acknowledgement
! message.
! EINVAL Invalid multiplexor ID number.
+ EINVAL fildes is the file descriptor of a pipe or FIFO.
! An I_PUNLINK can also fail while waiting for the multiplexing
! driver to acknowledge the link request if a message indicating
! an error or a hangup is received at the stream head of fildes.
! In addition, an error code can be returned in the positive or
! negative acknowledgement message. For these cases, I_PUNLINK
! will fail with errno set to the value in the message.
RETURN VALUES
! Unless specified otherwise above, the return value from ioctl(2) is 0
upon success and -1 upon failure, with errno set as indicated.
SEE ALSO
! close(2), fcntl(2), getmsg(2), ioctl(2), open(2), poll(2), putmsg(2),
! read(2), write(2), Intro(3), signal(3C), signal.h(3HEAD)
STREAMS Programming Guide
! illumos October 29, 2017 illumos