#include <termios.h>

     pid_t
     tcgetsid(int fildes);

DESCRIPTION

     The tcgetsid() function obtains the process group ID of the session for
     which the terminal specified by fildes is the controlling terminal.

RETURN VALUES

     Upon successful completion, tcgetsid() returns the process group ID asso-
     ciated with the terminal.  Otherwise, a value of (pid_t)-1 is returned
     and errno is set to indicate the error.

ERRORS

     The tcgetsid() function will fail if:

     [EACCES]           The fildes argument is not associated with a control-
                        ling terminal.

     [EBADF]            The fildes argument is not a valid file descriptor.

     [ENOTTY]           The file associated with fildes is not a terminal.

SEE ALSO

     getsid(2), setpgid(2), setsid(2), tcgetpgrp(3), termios(4)

STANDARDS

     The tcgetsid() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD                            December 20, 2003                           BSD