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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 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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                        TCGETPGRP(3P)