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



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

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 ter-
       minal 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 appli-
       cation 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 process is blocking or
       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.

       ENOTTY The calling process does not have a controlling terminal, or the file is not the controlling terminal, or the con-
              trolling 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 IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                 TCSETPGRP(3P)