GETSID(2)		   Linux Programmers Manual		    GETSID(2)



NAME
       getsid - get session ID

SYNOPSIS
       #include 

       pid_t getsid(pid_t pid);

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

       getsid(): _XOPEN_SOURCE >= 500

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.

CONFORMING TO
       SVr4, POSIX.1-2001.

NOTES
       Linux does not return EPERM.

       Linux has this system call since Linux 1.3.44.  There is  libc  support
       since libc 5.2.19.

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

COLOPHON
       This  page  is  part of release 3.05 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				  2007-07-26			     GETSID(2)