4.4BSD/usr/share/man/cat3/tcgetpgrp.0

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TCGETPGRP(3)                BSD Programmer's Manual               TCGETPGRP(3)

NNAAMMEE
     ttccggeettppggrrpp - get foreground process group ID

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>
     ##iinncclluuddee <<uunniissttdd..hh>>

     _p_i_d___t
     ttccggeettppggrrpp(_i_n_t _f_d);

DDEESSCCRRIIPPTTIIOONN
     The ttccggeettppggrrpp function returns the value of the process group ID of the
     foreground process group associated with the terminal device.  If there
     is no foreground process group, ttccggeettppggrrpp returns an invalid process ID.

EERRRROORRSS
     If an error occurs, ttccggeettppggrrpp returns -1 and the global variable _e_r_r_n_o is
     set to indicate the error, as follows:

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

     [ENOTTY]      The calling process does not have a controlling terminal or
                   the underlying terminal device represented by _f_d is not the
                   controlling terminal.

SSEEEE AALLSSOO
     setpgid(3),  setsid(2),  tcsetpgrp(3)

SSTTAANNDDAARRDDSS
     The ttccggeettppggrrpp function is expected to be compliant with the IEEE
     Std1003.1-1988 (``POSIX'') specification.

4.4BSD                           June 4, 1993                                1