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- .\" Copyright (c) 1990, 1991 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.
- .\"
- .\" from: @(#)system.3 6.5 (Berkeley) 6/29/91
- .\" $Id: system.3,v 1.2 1995/11/01 16:43:27 deraadt Exp $
- .\"
- .Dd June 29, 1991
- .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.
- Otherwise,
- .Fn system
- returns the termination status of the shell in the format specified by
- .Xr waitpid 2 .
- .Sh RETURN VALUES
- If a child process cannot be created, or the termination status of
- the shell cannot be obtained,
- .Fn system
- returns -1 and sets
- .Va errno
- to indicate the error.
- If execution of the shell fails,
- .Fn system
- returns the termination status for a program that terminates with a call of
- .Fn exit 127 .
- .Sh SEE ALSO
- .Xr sh 1 ,
- .Xr execve 2 ,
- .Xr popen 3 ,
- .Xr waitpid 3 ,
- .Sh STANDARDS
- The
- .Fn system
- function
- conforms to
- .St -ansiC
- and
- .St -1003.2-92 .
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