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Linux 2.6 - man page for getsid (linux section 3posix)

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 vol-
       ume 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					GETSID(P)


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