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setsid(1) [bsd man page]

SETSID(1)							   User Commands							 SETSID(1)

setsid - run a program in a new session SYNOPSIS
setsid [options] program [arguments] DESCRIPTION
setsid runs a program in a new session. The command calls fork(2) if already a process group leader. Otherwise, it executes a program in the current process. OPTIONS
-c, --ctty Set the controlling terminal to the current one. -w, --wait Wait for the execution of the program to end, and return the exit value of this program as the return value of setsid. -V, --version Display version information and exit. -h, --help Display help text and exit. SEE ALSO
setsid(2) AUTHOR
Rick Sladkey <> AVAILABILITY
The setsid command is part of the util-linux package and is available from util-linux July 2014 SETSID(1)

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

setsid - creates a session and sets the process group ID SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
setsid() creates a new session if the calling process is not a process group leader. The calling process is the leader of the new session, the process group leader of the new process group, and has no controlling tty. The process group ID and session ID of the calling process are set to the PID of the calling process. The calling process will be the only process in this new process group and in this new session. RETURN VALUE
The session ID of the calling process. ERRORS
On error, -1 will be returned. The only error which can happen is EPERM. It is returned when the process group ID of any process equals the PID of the calling process. Thus, in particular, setsid fails if the calling process is already a process group leader. NOTES
A process group leader is a process with process group ID equal to its PID. In order to be sure that setsid will succeed, fork and exit, and have the child do setsid(). CONFORMING TO
setpgid(2), setpgrp(2) Linux 1.0.0 1994-08-27 SETSID(2)

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