NAME
getsid() — get session ID
SYNOPSIS
#include <sys/types.h>
pid_t getsid (pid_t pid);
DESCRIPTION
The
getsid()
function returns the session ID of the specified process.
If
pid
is
0,
the call applies to the current process.
For this to be allowed,
the current process and the referenced
process must be in the same session.
RETURN VALUE
Upon successful completion,
getsid()
returns the session ID
of the specified process.
Otherwise, it returns a value of
-l
and sets
errno
to indicate the error.
ERRORS
If the
getsid()
function fails,
it sets
errno
(see
errno(2))
to one of the following values:
- [EPERM]
The current process and the specified process are
not in the same session.
- [ESRCH]
No process can be found corresponding to that
specified by
pid.
