GETSID(2) |
FreeBSD System Calls Manual |
GETSID(2) |
NAME
getsid —
get process session
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include < unistd.h>
pid_t
getsid( pid_t pid);
DESCRIPTION
The session ID of the process identified by
pid is returned by
getsid(). If
pid is zero,
getsid() returns the session ID of the current process.
RETURN VALUES
Upon successful completion, the
getsid() system call returns the session ID of the specified process; otherwise, it returns a value of -1 and sets errno to indicate an error.
ERRORS
The
getsid() system call will succeed unless:
-
[
ESRCH]
-
if there is no process with a process ID equal to
pid.
Note that an implementation may restrict this system call to processes within the same session ID as the calling process.
HISTORY
The
getsid() system call appeared in
FreeBSD 3.0. The
getsid() system call is derived from its usage in AT&T System V UNIX.