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 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 POSIX.1‐2008, <sys_types.h>, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have  been  introduced
       during   the   conversion  of  the  source  files  to  man  page  format.  To  report  such  errors,  see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .