GETSID(3)                  POSIX Programmer's Manual                 GETSID(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NAME
       getsid -- get the process group ID of a session leader

SYNOPSIS
       #include <unistd.h>

       pid_t getsid(pid_t pid);

DESCRIPTION
       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.

RETURN VALUE
       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.

ERRORS
       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.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec, fork(), getpid(), getpgid(), setpgid(), setsid()

       The Base Definitions volume of POSIX.1-2017, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                            GETSID(3)
