setsid(2)setsid(2)Namesetsid - POSIX create session and set process group ID
Syntax
#include <sys/types.h>
pid_t
setsid()Description
The system call creates a new session, if the calling process is not a
process group leader. The calling process is the session leader of the
new session, the process group leader of the new process group, and
does not have a controlling terminal. The process group ID of the
calling process is set equal to the process ID of the calling process.
Return Values
Upon successful completion, the system call returns the value of the
process group ID of the calling process. If the system call fails, -1
is returned, and the global variable errno indicates the reason.
Diagnostics
The system call fails and a new session is not created if the following
occurs:
[EPERM] The calling process is already a process group leader.
The process group ID of a process other than the calling
process matches the process ID of the calling process.
See Alsogetpgrp(2), setpgid(3)setsid(2)