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GETSID(P)		   POSIX Programmer's Manual		     GETSID(P)

NAME
       getsid - get the process group ID of a session leader

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);

DESCRIPTION
       The  getsid() function shall obtain the process group ID of the process
       that is the session leader of the process specified by pid. If  pid  is
       (pid_t)0, it specifies the calling process.

RETURN VALUE
       Upon  successful completion, getsid() shall return the process group ID
       of the session leader of the specified process.	 Otherwise,  it	 shall
       return (pid_t)-1 and set errno to indicate the error.

ERRORS
       The getsid() function shall fail if:

       EPERM  The  process  specified by pid is not in the same session as the
	      calling process, and the implementation does not allow access to
	      the  process group ID of the session leader of that process from
	      the calling process.

       ESRCH  There is no process with a process ID equal to pid.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec() , fork() , getpid() , getpgid() , setpgid()  ,  setsid()	,  the
       Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			     GETSID(P)
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