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 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 associated 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, 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(P)