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GETSID(2)                   BSD System Calls Manual                  GETSID(2)

NAME
     getsid -- get process session

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     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
     getpgid(2), getpgrp(2), setpgid(2), setsid(2), termios(4)

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'').

BSD                             April 28, 2017                             BSD