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setsid() - Unix, Linux System Call
setsid - creates a session and sets the process group ID
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.
The session ID of the calling process.
On error, -1 is returned, and
errno is set.
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.
A child created via
inherits its parents session ID.
The session ID is preserved across an
A process group leader is a process with process group ID equal
to its PID. In order to be sure that
setsid() will succeed,
exit(), and have the child do