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.
SEE ALSO
STANDARDS
The setsid() function is compliant with
the IEEE Std 1003.1-2008 (“POSIX.1”)
specification.