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authorcvs2svn <cvs2svn@FreeBSD.org>1998-01-10 23:00:07 +0000
committercvs2svn <cvs2svn@FreeBSD.org>1998-01-10 23:00:07 +0000
commit7c6e96080c4fb49bf912942804477d202a53396c (patch)
tree876b1afcb203be407dbb2ddfc69653f78b8680c2 /lib/libc/stdlib/system.3
parent1a06f650e6ca43e02260e8d252597fbed2cea73e (diff)
downloadFreeBSD-src-7c6e96080c4fb49bf912942804477d202a53396c.zip
FreeBSD-src-7c6e96080c4fb49bf912942804477d202a53396c.tar.gz
This commit was manufactured by cvs2svn to create branch 'JB'.
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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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by the University of
-.\" California, Berkeley and its contributors.
-.\" 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
-.\"
-.Dd June 4, 1993
-.Dt SYSTEM 3
-.Os
-.Sh NAME
-.Nm system
-.Nd pass a command to the shell
-.Sh SYNOPSIS
-.Fd #include <stdlib.h>
-.Ft int
-.Fn system "const char *string"
-.Sh DESCRIPTION
-The
-.Fn system
-function
-hands the argument
-.Fa string
-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 string
-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.
-.Pp
-The
-.Fn system
-function
-returns the exit status of the shell, or \-1 if the
-.Xr wait 2
-for the shell failed.
-A return value of 127 means the execution of the shell
-failed.
-.Sh SEE ALSO
-.Xr sh 1 ,
-.Xr execve 2 ,
-.Xr wait 2 ,
-.Xr popen 3
-.Sh STANDARDS
-The
-.Fn system
-function
-conforms to
-.St -ansiC .
-and is expected to be
-.St -p1003.2
-compatible.
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