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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. 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.
-.\"
-.\"     $OpenBSD: system.3,v 1.14 2016/02/05 18:09:19 espie Exp $
-.\"
-.Dd $Mdocdate: February 5 2016 $
-.Dt SYSTEM 3
-.Os
-.Sh NAME
-.Nm system
-.Nd pass a command to the shell
-.Sh SYNOPSIS
-.In 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
-.Dv NULL ,
-.Fn system
-will return non-zero.
-Otherwise,
-.Fn system
-returns the termination status of the shell in the format specified by
-.Xr waitpid 2 .
-.Pp
-Note that fork handlers established using
-.Xr pthread_atfork 3
-are not called when a multithreaded program calls
-.Fn system .
-.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 waitpid 2 ,
-.Xr popen 3
-.Sh STANDARDS
-The
-.Fn system
-function conforms to
-.St -ansiC
-and
-.St -p1003.2-92 .
-.Sh HISTORY
-The
-.Fn system
-function first appeared in
-.At v6 .
-.Sh CAVEATS
-Never supply the
-.Fn system
-function with a command containing any part of an unsanitized user-supplied
-string.
-Shell meta-characters present will be honored by the
-.Xr sh 1
-command interpreter.
-.Pp
-It is often simpler to bypass the shell and run an external command using
-.Xr fork 2 ,
-.Xr execlp 3 ,
-and
-.Xr waitpid 2
-directly instead of having to sanitize a string for shell consumption.