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 .