setsid (2)

Leading comments

 Copyright (c) 1991, 1993
	The Regents of the University of California.  All rights reserved.

 Redistribution and use in source and binary forms, with or without
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 1. Redistributions of source code must retain the above copyright
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    notice, this list of conditions and the following...

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

NAME

setsid - create session and set process group ID

LIBRARY

Lb libc

SYNOPSIS

In unistd.h Ft pid_t Fn setsid void

DESCRIPTION

The Fn setsid system call creates a new session. The calling process is the session leader of the new session, is the process group leader of a new process group and has no controlling terminal. The calling process is the only process in either the session or the process group.

RETURN VALUES

Upon successful completion, the Fn setsid system call returns the value of the process group ID of the new process group, which is the same as the process ID of the calling process. If an error occurs, Fn setsid returns -1 and the global variable errno is set to indicate the error.

ERRORS

The Fn setsid system call will fail if:

Bq Er EPERM

The calling process is already a process group leader, or the process group ID of a process other than the calling process matches the process ID of the calling process.

SEE ALSO

setpgid(2), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS

The Fn setsid system call is expected to be compliant with the St -p1003.1-90 specification.