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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 (consult 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  information  may  be	subse‐
       quently	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 associated with the termi‐
       nal. 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, Copyright (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.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			 TCGETPGRP(3P)

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