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

NAME
     ggeettssiidd - get process session

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     pidt
     ggeettssiidd(pidt pid);

DESCRIPTION
     The session ID of the process identified by pid is returned by ggeettssiidd().
     If pid is zero, ggeettssiidd() returns the session ID of the current process.

RETURN VALUES
     Upon successful completion, the function ggeettssiidd() returns the session ID
     of the specified process; otherwise, it returns a value of -1 and sets
     errno to indicate an error.

EERRRROORRSS
     The ggeettssiidd() system call will fail if:

     [ESRCH]            There is no process with a process ID equal to pid.

     Note that an implementation may restrict this function call to processes
     within the same session ID as the calling process.

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

HISTORY
     The ggeettssiidd() function call appeared in FreeBSD 3.0.  The ggeettssiidd() func-
     tion call is derived from its usage in AT&T System V UNIX.

BSD                             August 19, 1997                            BSD