getsid

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



NAME
       getsid - get session ID

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);

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.)  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 current process, and the implementation consid-
	      ers this an error.

       ESRCH  No process with process ID p was found.

CONFORMING TO
       SVr4, POSIX 1003.1-2001.

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.

       To  get	the  prototype	under  glibc,  define  both _XOPEN_SOURCE and
       _XOPEN_SOURCE_EXTENDED, or use  "#define	 _XOPEN_SOURCE	n"  for	 some
       integer n larger than or equal to 500.

SEE ALSO
       getpgid(2), setsid(2)



Linux 2.5.0			  2001-12-17			    GETSID(2)