NAME
setsid —
create session and set process group
ID
LIBRARY
library “libc”
SYNOPSIS
#include
<unistd.h>
pid_t
setsid(void);
DESCRIPTION
Thesetsid()
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.
RETURN VALUES
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. If an error
occurs, setsid() returns -1 and the global variable
errno is set to indicate the error.
ERRORS
The setsid() function will fail if:
- [
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 expected to be
compliant with the IEEE Std 1003.1-1990
(“POSIX.1”) specification.