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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SETSID" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" setsid 
+.SH 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.
+.SH NAME
+setsid \- create session and set process group ID
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+pid_t setsid(void);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsetsid\fP() function shall create a new session, if the calling
+process is not a process group leader. Upon return the
+calling process shall be the session leader of this new session, shall
+be the process group leader of a new process group, and
+shall have no controlling terminal. The process group ID of the calling
+process shall be set equal to the process ID of the calling
+process. The calling process shall be the only process in the new
+process group and the only process in the new session.
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIsetsid\fP() shall return the value
+of the new process group ID of the calling process.
+Otherwise, it shall return (\fBpid_t\fP)-1 and set \fIerrno\fP to
+indicate the error.
+.SH ERRORS
+.LP
+The \fIsetsid\fP() function shall fail if:
+.TP 7
+.B EPERM
+The calling process is already a process group leader, or the process
+group ID of a process other than the calling process
+matches the process ID of the calling process.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+The \fIsetsid\fP() function is similar to the \fIsetpgrp\fP() function
+of System V.
+System V, without job control, groups processes into process groups
+and creates new process groups via \fIsetpgrp\fP(); only one process
+group may be part of a login session.
+.LP
+Job control allows multiple process groups within a login session.
+In order to limit job control actions so that they can only
+affect processes in the same login session, this volume of IEEE\ Std\ 1003.1-2001
+adds the concept of a session that is
+created via \fIsetsid\fP(). The \fIsetsid\fP() function also creates
+the initial process group contained in the session.
+Additional process groups can be created via the \fIsetpgid\fP() function.
+A System V
+process group would correspond to a POSIX System Interfaces session
+containing a single POSIX process group. Note that this
+function requires that the calling process not be a process group
+leader. The usual way to ensure this is true is to create a new
+process with \fIfork\fP() and have it call \fIsetsid\fP(). The \fIfork\fP()
+function guarantees that the process ID of the new process does not
+match any existing
+process group ID.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIgetsid\fP(), \fIsetpgid\fP(), \fIsetpgrp\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 .