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Diffstat (limited to 'lib/libc/stdlib/system.3')
-rw-r--r-- | lib/libc/stdlib/system.3 | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/libc/stdlib/system.3 b/lib/libc/stdlib/system.3 new file mode 100644 index 0000000..3d13489 --- /dev/null +++ b/lib/libc/stdlib/system.3 @@ -0,0 +1,99 @@ +.\" 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 +.\" $FreeBSD$ +.\" +.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 *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. +.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. |