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  12 .\" Copyright 2015 Joyent, Inc.
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  14 .Dd May 11, 2016
  15 .Dt PASFD 3PROC
  16 .Os
  17 .Sh NAME
  18 .Nm Pasfd
  19 .Nd obtain the process address space file descriptor
  20 .Sh SYNOPSIS
  21 .Lb libproc
  22 .In libproc.h
  23 .Ft int
  24 .Fo Pasfd
  25 .Fa "struct ps_prochandle *P"
  26 .Fc
  27 .Sh DESCRIPTION
  28 The
  29 .Fn Pasfd
  30 funtion returns a file descriptor that allows direct access to the
  31 address space of the process handle
  32 .Fa P .
  33 A defined file descriptor is provided when using the
  34 .Xr Pcreate 3PROC ,
  35 .Xr Pgrab 3PROC ,
  36 .Xr Pgrab_file 3PROC ,
  37 and
  38 .Xr Pgrab_core 3PROC
  39 functions.
  40 Note that the address space may be different in each of these cases and doesn't
  41 necessarily correspond to the /proc
  42 .Sy as
  43 file, except for live processes.
  44 Other means of obtaining a
  45 .Sy libproc
  46 process handle may not define a file descriptor that contains the
  47 address space.
  48 .Pp
  49 The returned file descriptor must not be closed and is only valid for
  50 as long as the corresponding process handle
  51 .Fa P
  52 is valid.
  53 After a call to
  54 .Xr Prelease 3PROC
  55 the file descriptor is invalidated.
  56 .Sh RETURN VALUES
  57 Upon successful completion, the
  58 .Fn Pasfd
  59 function returns a valid file descriptor.
  60 Otherwise, if none exists, then
  61 .Sy -1
  62 is returned.
  63 .Sh INTERFACE STABILITY
  64 .Sy Uncommitted
  65 .Sh MT-LEVEL
  66 See
  67 .Sy LOCKING
  68 in
  69 .Xr libproc 3LIB .
  70 .Sh SEE ALSO
  71 .Xr libproc 3LIB ,
  72 .Xr Pcreate 3PROC ,
  73 .Xr Pgrab 3PROC ,
  74 .Xr Pgrab_core 3PROC ,
  75 .Xr Pgrab_file 3PROC ,
  76 .Xr Prelease 3PROC ,
  77 .Xr proc 4