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setsid(2) [osx man page]

SETSID(2)						      BSD System Calls Manual							 SETSID(2)

NAME
setsid -- create session and set process group ID SYNOPSIS
#include <unistd.h> pid_t setsid(void); DESCRIPTION
The setsid function 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. Upon successful completion, the setsid function 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. ERRORS
If an error occurs, setsid returns -1 and the global variable errno is set to indicate the error, as follows: [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. LEGACY SYNOPSIS
#include <sys/types.h> #include <unistd.h> The include file <sys/types.h> is necessary. SEE ALSO
setpgid(3), tcgetpgrp(3), tcsetpgrp(3), compat(5) STANDARDS
The setsid function is expected to be compliant with the IEEE Std 1003.1-1988 (``POSIX.1'') specification. BSD
June 4, 1993 BSD

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

NAME
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 terminal. 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
On success, the (new) session ID of the calling process is returned. On error, (pid_t) -1 is returned, and errno is set to indicate the error. ERRORS
EPERM 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. CONFORMING TO
SVr4, POSIX.1-2001. NOTES
A child created via fork(2) inherits its parent's session ID. The session ID is preserved across an execve(2). 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(2) and _exit(2), and have the child do setsid(). SEE ALSO
setsid(1), getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7) COLOPHON
This page is part of release 3.53 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 2013-02-11 SETSID(2)
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