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  12 .\" Copyright 2015 Joyent, Inc.
  13 .\"
  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 LIBRARY
  21 .Lb libproc
  22 .Sh SYNOPSIS
  23 .In libproc.h
  24 .Ft int
  25 .Fo Pasfd
  26 .Fa "struct ps_prochandle *P"
  27 .Fc
  28 .Sh DESCRIPTION
  29 The
  30 .Fn Pasfd
  31 funtion returns a file descriptor that allows direct access to the
  32 address space of the process handle
  33 .Fa P .
  34 A defined file descriptor is provided when using the
  35 .Xr Pcreate 3PROC ,
  36 .Xr Pgrab 3PROC ,
  37 .Xr Pgrab_file 3PROC ,
  38 and
  39 .Xr Pgrab_core 3PROC
  40 functions.
  41 Note that the address space may be different in each of these cases and doesn't
  42 necessarily correspond to the /proc
  43 .Sy as
  44 file, except for live processes.
  45 Other means of obtaining a
  46 .Sy libproc
  47 process handle may not define a file descriptor that contains the
  48 address space.
  49 .Pp
  50 The returned file descriptor must not be closed and is only valid for
  51 as long as the corresponding process handle
  52 .Fa P
  53 is valid.
  54 After a call to
  55 .Xr Prelease 3PROC
  56 the file descriptor is invalidated.
  57 .Sh RETURN VALUES
  58 Upon successful completion, the
  59 .Fn Pasfd
  60 function returns a valid file descriptor.
  61 Otherwise, if none exists, then
  62 .Sy -1
  63 is returned.
  64 .Sh INTERFACE STABILITY
  65 .Sy Uncommitted
  66 .Sh MT-LEVEL
  67 See
  68 .Sy LOCKING
  69 in
  70 .Xr libproc 3LIB .
  71 .Sh SEE ALSO
  72 .Xr libproc 3LIB ,
  73 .Xr Pcreate 3PROC ,
  74 .Xr Pgrab 3PROC ,
  75 .Xr Pgrab_core 3PROC ,
  76 .Xr Pgrab_file 3PROC ,
  77 .Xr Prelease 3PROC ,
  78 .Xr proc 4