getsid (2)

Leading comments

Copyright (c) 1997 Peter Wemm <peter@FreeBSD.org>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other ma...

(The comments found at the beginning of the groff file "man2/getsid.2freebsd".)

NAME

getsid - get process session

LIBRARY

Lb libc

SYNOPSIS

In unistd.h Ft pid_t Fn getsid pid_t pid

DESCRIPTION

The session ID of the process identified by Fa pid is returned by Fn getsid . If Fa pid is zero, Fn getsid returns the session ID of the current process.

RETURN VALUES

Upon successful completion, the Fn getsid system call returns the session ID of the specified process; otherwise, it returns a value of -1 and sets errno to indicate an error.

ERRORS

The Fn getsid system call will succeed unless:

Bq Er ESRCH

if there is no process with a process ID equal to Fa pid .

Note that an implementation may restrict this system call to processes within the same session ID as the calling process.

SEE ALSO

getpgid(2), getpgrp(2), setpgid(2), setsid(2), termios(4)

HISTORY

The Fn getsid system call appeared in Fx 3.0 . The Fn getsid system call is derived from its usage in AT&T System V .