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13111 Want futimes() and lutimes() functions
Change-ID: I3be82d4242255a4100f8c35db373eb9140402fc4
@@ -1,45 +1,62 @@
UTIMES(2) System Calls UTIMES(2)
NAME
- utimes, futimesat - set file access and modification times
+ utimes, lutimes, futimes, futimesat, utimens, utimensat - set file
+ access and modification times
SYNOPSIS
#include <sys/time.h>
int utimes(const char *path, const struct timeval times[2]);
+ int lutimes(const char *path, const struct timeval times[2]);
+
+
+ int futimes(int fildes, const struct timeval times[2]);
+
+
int futimesat(int fildes, const char *path,
const struct timeval times[2]);
#include <sys/stat.h>
- int futimens(int filedes, const timespec_t nstimes[2]);
+ int futimens(int fildes, const timespec_t nstimes[2]);
- int utimensat(int filedes, const char *path,
+ int utimensat(int fildes, const char *path,
const timespec_t nstimes[2], int flag);
DESCRIPTION
The utimes() function sets the access and modification times of the
file pointed to by the path argument to the value of the times
argument. It allows time specifications accurate to the microsecond.
+ The lutimes() function operates like utimes() except if path points to
+ a symbolic link; in that case lutimes() changes the access and
+ modifications times of the link, while utimes() changes the file that
+ is referenced by the link.
+
+
+ The futimes() function sets the access and modification times of the
+ file referenced by the file descriptor fildes.
+
+
The futimesat() function also sets access and modification times. See
fsattr(5). If path is a relative path name, however, futimesat()
resolves the path relative to the fildes argument rather than the
current working directory. If fildes is set to AT_FDCWD, defined in
<fcntl.h>, futimesat() resolves the path relative to the current
working directory. If path is a null pointer, futimesat() sets the
access and modification times on the file referenced by fildes. The
- fildes argument is ignored even when futimesat() is provided with an
- absolute path.
+ fildes argument is ignored if futimesat() is provided with an absolute
+ path.
The times argument is an array of timeval structures. The first array
member represents the date and time of last access, and the second
member represents the date and time of last modification. The times in
@@ -57,32 +74,34 @@
The futimens() and utimensat() functions also set access and
modification times; however, instead of taking struct timeval, they
take timespec_t which allows for nanosecond granularity. The futimens()
function sets the access and modification times on the file descriptor
- referenced by filedes.
+ referenced by fildes.
The utimensat() function determines the file to set the access and
- modification times in an similar way to futemsat(). If the argument
- path is an absolute path, then the argument filedes is ignored;
+ modification times in an similar way to futimesat(). If the argument
+ path is an absolute path, then the argument fildes is ignored;
otherwise, path is interpreted as a path relative to the directory
- specified by filedes. If filedes is set to AT_FDCWD, then path is
+ specified by fildes. If fildes is set to AT_FDCWD, then path is
resolved relative to the current working directory. The behavior when
encountering symbolic links may be controlled by the value of the flag
argument. If the value of flag is the constant AT_SYMLINK_NOFOLLOW,
then when a symbolic link is encountered while resolving a path, it
- will not be followed. Otherwise, the value of flag should be 0.
+ will not be followed. Otherwise, the value of flag should be 0. Note
+ that, unlike futimesat(), utimensat() does not accept a null pointer
+ for the path argument.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned,
errno is set to indicate the error, and the file times will not be
affected.
ERRORS
- The utimes(), futimesat(), futimens(), and utimensat() functions will
- fail if:
+ The utimes(), lutimes(), futimes(), futimesat(), futimens(), and
+ utimensat() functions will fail if:
EACCES
Search permission is denied by a component of the path
prefix; or the times argument is a null pointer and the
effective user ID of the process does not match the
@@ -89,19 +108,17 @@
owner of the file and write access is denied.
EFAULT
The path or times argument points to an illegal
- address. For futimesat(), path might have the value
- NULL if the fildes argument refers to a valid open file
- descriptor.
+ address.
EINTR
A signal was caught during the execution of the
- utimes(), futimesat(), futimens(), or utimensat()
- functions.
+ utimes(), lutimes(), futimes(), futimesat(),
+ futimens(), or utimensat() functions.
EINVAL
The number of microseconds specified in one or both of
the timeval structures pointed to by times was greater
@@ -178,10 +195,10 @@
For utimes(), utimensat() and futimensat(), see standards(5).
SEE ALSO
- futimens(2), stat(2), utime(2), attributes(5), fsattr(5), standards(5)
+ fBstat(2), utime(2), attributes(5), fsattr(5), standards(5)
- December 20, 2014 UTIMES(2)
+ September 6, 2020 UTIMES(2)