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stdlib/FreeBSD/system.3 Libc-1725.40.4 /dev/null
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-.\" Copyright (c) 1990, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)system.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/stdlib/system.3,v 1.13 2008/06/26 08:24:59 danger Exp $
-.\"
-.Dd June 4, 1993
-.Dt SYSTEM 3
-.Os
-.Sh NAME
-.Nm system
-.Nd pass a command to the shell
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdlib.h
-.Ft int
-.Fn system "const char *command"
-.Sh DESCRIPTION
-The
-.Fn system
-function
-hands the argument
-.Fa command
-to the command interpreter
-.Xr sh 1 .
-The calling process waits for the shell
-to finish executing the command,
-ignoring
-.Dv SIGINT
-and
-.Dv SIGQUIT ,
-and blocking
-.Dv SIGCHLD .
-.Pp
-If
-.Fa command
-is a
-.Dv NULL
-pointer,
-.Fn system
-will return non-zero if the command interpreter
-.Xr sh 1
-is available, and zero if it is not.
-.Sh RETURN VALUES
-The
-.Fn system
-function
-returns the exit status of the shell as returned by
-.Xr waitpid 2 ,
-or \-1 if an error occurred when invoking
-.Xr fork 2
-or
-.Xr waitpid 2 .
-A return value of 127 means the execution of the shell
-failed.
-.Sh SEE ALSO
-.Xr sh 1 ,
-.Xr execve 2 ,
-.Xr fork 2 ,
-.Xr waitpid 2 ,
-.Xr popen 3
-.Sh STANDARDS
-The
-.Fn system
-function
-conforms to
-.St -isoC
-and is expected to be
-.St -p1003.2
-compatible.