getsid man page on Debian

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GETSID(2)		   Linux Programmer's Manual		     GETSID(2)

NAME
       getsid - get session ID

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getsid():
	   Since glibc 2.12:
	       _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 500 ||
	       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
	   Before glibc 2.12:
	       _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

DESCRIPTION
       getsid(0) returns the session ID of  the	 calling  process.   getsid(p)
       returns	the session ID of the process with process ID p.  (The session
       ID of a process is the process group ID of the session leader.)

RETURN VALUE
       On success, a session ID is returned.  On  error,  (pid_t) -1  will  be
       returned, and errno is set appropriately.

ERRORS
       EPERM  A	 process  with	process ID p exists, but it is not in the same
	      session as the calling process, and the implementation considers
	      this an error.

       ESRCH  No process with process ID p was found.

VERSIONS
       This system call is available on Linux since version 2.0.

CONFORMING TO
       SVr4, POSIX.1-2001.

NOTES
       Linux does not return EPERM.

SEE ALSO
       getpgid(2), setsid(2), credentials(7)

COLOPHON
       This  page  is  part of release 3.27 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2010-09-20			     GETSID(2)
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