getsid man page on OpenDarwin

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

NAME
     getsid — get process session

LIBRARY
     Standard C Library (libc, -lc)

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:

     [ESRCH]		if 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 getsid() function call appeared in FreeBSD 3.0.  The getsid() func‐
     tion call is derived from its usage in AT&T System V UNIX.

BSD				August 19, 1997				   BSD
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