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.1‐2017, <sys_types.h>, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  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 .

       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 .