NAME
setsid —
create session and set process
group ID
LIBRARY
Standard C Library (libc, -lc)
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
getsid(2),
setpgid(2),
tcgetpgrp(3),
tcsetpgrp(3)
STANDARDS
The
setsid() function conforms to
IEEE Std
1003.1-1990 (“POSIX.1”).