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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "TCSETPGRP" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" tcsetpgrp 
+.SH NAME
+tcsetpgrp \- set the foreground process group ID
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int tcsetpgrp(int\fP \fIfildes\fP\fB, pid_t\fP \fIpgid_id\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+If the process has a controlling terminal, \fItcsetpgrp\fP() shall
+set the foreground process group ID associated with the
+terminal to \fIpgid_id\fP. The application shall ensure that the file
+associated with \fIfildes\fP 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 \fIpgid_id\fP matches a process group
+ID of a process in the same session as the calling
+process.
+.LP
+Attempts to use \fItcsetpgrp\fP() from a process which is a member
+of a background process group on a \fIfildes\fP 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.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 shall be returned. Otherwise, -1 shall
+be returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fItcsetpgrp\fP() function shall fail if:
+.TP 7
+.B EBADF
+The \fIfildes\fP argument is not a valid file descriptor.
+.TP 7
+.B EINVAL
+This implementation does not support the value in the \fIpgid_id\fP
+argument.
+.TP 7
+.B 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.
+.TP 7
+.B EPERM
+The value of \fIpgid_id\fP 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.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fItcgetpgrp\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<sys/types.h>\fP, \fI<unistd.h>\fP
+.SH 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, Copyright (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.opengroup.org/unix/online.html .