TCSETPGRP(3)               POSIX Programmer's Manual              TCSETPGRP(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NAME
       tcsetpgrp -- set the foreground process group ID

SYNOPSIS
       #include <unistd.h>

       int tcsetpgrp(int fildes, pid_t pgid__id);

DESCRIPTION
       If the process has a controlling terminal, tcsetpgrp() shall set the
       foreground process group ID associated with the terminal to pgid__id.
       The application shall ensure that the file associated with fildes is
       the controlling terminal of the calling process and the controlling
       terminal is currently associated with the session of the calling
       process. The application shall ensure that the value of pgid__id matches
       a process group ID of a process in the same session as the calling
       process.

       Attempts to use tcsetpgrp() from a process which is a member of a
       background process group on a fildes associated with its controlling
       terminal shall cause the process group to be sent a SIGTTOU signal. If
       the calling thread is blocking SIGTTOU signals or the process is
       ignoring SIGTTOU signals, the process shall be allowed to perform the
       operation, and no signal is sent.

RETURN VALUE
       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be
       returned and errno set to indicate the error.

ERRORS
       The tcsetpgrp() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EINVAL This implementation does not support the value in the pgid__id
              argument.

       EIO    The process group of the writing process is orphaned, the
              calling thread is not blocking SIGTTOU, and the process is not
              ignoring SIGTTOU.

       ENOTTY The calling process does not have a controlling terminal, or the
              file is not the controlling terminal, or the controlling
              terminal is no longer associated with the session of the calling
              process.

       EPERM  The value of pgid__id is a value supported by the implementation,
              but does not match the process group ID of a process in the same
              session as the calling process.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       tcgetpgrp()

       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 .



IEEE/The Open Group                  2017                         TCSETPGRP(3)
