NAME
getsid —
get process session
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 function
getsid() returns the session ID of the specified
process; otherwise, it returns a value of -1 and sets
errno to indicate an error.
ERRORS
getsid() will succeed unless:
- [
EPERM] - The current process and the process pid are not in the same session.
- [
ESRCH] - There is no process with a process ID equal to pid.
SEE ALSO
STANDARDS
getsid() conforms to IEEE
Std 1003.1-2008 (“POSIX.1”).
HISTORY
The getsid() function call is derived from
its usage in AT&T System V UNIX, and is
mandated by X/Open Portability Guide Issue 4
(“XPG4”).