GETSID(3P) POSIX Programmer's Manual GETSID(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEgetsid — get the process group ID of a session leader
pid_t getsid(pid_t pid);
The getsid() function shall obtain the process group ID of the process
that is the session leader of the process specified by pid. If pid is
(pid_t)0, it specifies the calling process.
Upon successful completion, getsid() shall return the process group ID
of the session leader of the specified process. Otherwise, it shall
return −1 and set errno to indicate the error.
The getsid() function shall fail if:
EPERM The process specified by pid is not in the same session as the
calling process, and the implementation does not allow access to
the process group ID of the session leader of that process from
the calling process.
ESRCH There is no process with a process ID equal to pid.
The following sections are informative.
exec, fork(), getpid(), getpgid(), setpgid(), setsid()
The Base Definitions volume of POSIX.1‐2008, <unistd.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.unix.org/online.html .
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IEEE/The Open Group 2013 GETSID(3P)