TCGETPGRP(3P)                                       POSIX Programmer's Manual                                      TCGETPGRP(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       tcgetpgrp - get the foreground process group ID

SYNOPSIS
       #include <unistd.h>

       pid_t tcgetpgrp(int fildes);


DESCRIPTION
       The  tcgetpgrp()  function shall return the value of the process group ID of the foreground process group associated with
       the terminal.

       If there is no foreground process group, tcgetpgrp() shall return a value greater than 1 that does not match the  process
       group ID of any existing process group.

       The  tcgetpgrp() function is allowed from a process that is a member of a background process group; however, the informa-
       tion may be subsequently changed by a process that is a member of a foreground process group.

RETURN VALUE
       Upon successful completion, tcgetpgrp() shall return the value of the process group ID of the foreground process  associ-
       ated with the terminal. Otherwise, -1 shall be returned and errno set to indicate the error.

ERRORS
       The tcgetpgrp() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       ENOTTY The calling process does not have a controlling terminal, or the file is not the controlling terminal.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       setsid(), setpgid(), tcsetpgrp(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open  Group
       Standard   is   the   referee   document.   The   original   Standard   can   be   obtained  online  at  http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 TCGETPGRP(3P)