2faeeff4c9
Stop calling system calls "function calls". Use "The .Fn system call" a-la "The .Nm utility". When referring to a non-BSD implementation in the HISTORY section, call syscall a function, to be safe.
86 lines
3.0 KiB
Groff
86 lines
3.0 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)setsid.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt SETSID 2
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.Os
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.Sh NAME
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.Nm setsid
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.Nd create session and set process group ID
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft pid_t
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.Fn setsid void
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.Sh DESCRIPTION
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The
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.Fn setsid
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system call creates a new session.
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The calling process is the session leader of the new session, is the
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process group leader of a new process group and has no controlling
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terminal.
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The calling process is the only process in either the session or the
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process group.
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.Sh RETURN VALUES
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Upon successful completion, the
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.Fn setsid
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system call returns the value of the process group ID of the new process
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group, which is the same as the process ID of the calling process.
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If an error occurs,
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.Fn setsid
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returns -1 and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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The
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.Fn setsid
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EPERM
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The calling process is already a process group leader, or the process
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group ID of a process other than the calling process matches the process
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ID of the calling process.
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.El
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.Sh SEE ALSO
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.Xr setpgid 2 ,
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.Xr tcgetpgrp 3 ,
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.Xr tcsetpgrp 3
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.Sh STANDARDS
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The
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.Fn setsid
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system call is expected to be compliant with the
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.St -p1003.1-90
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specification.
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