| | 1 | .\" Copyright (c) 1990, 1991, 1993 |
| | 2 | .\" The Regents of the University of California. All rights reserved. |
| | 3 | .\" |
| | 4 | .\" This code is derived from software contributed to Berkeley by |
| | 5 | .\" the American National Standards Committee X3, on Information |
| | 6 | .\" Processing Systems. |
| | 7 | .\" |
| | 8 | .\" Redistribution and use in source and binary forms, with or without |
| | 9 | .\" modification, are permitted provided that the following conditions |
| | 10 | .\" are met: |
| | 11 | .\" 1. Redistributions of source code must retain the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer. |
| | 13 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 14 | .\" notice, this list of conditions and the following disclaimer in the |
| | 15 | .\" documentation and/or other materials provided with the distribution. |
| | 16 | .\" 4. Neither the name of the University nor the names of its contributors |
| | 17 | .\" may be used to endorse or promote products derived from this software |
| | 18 | .\" without specific prior written permission. |
| | 19 | .\" |
| | 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 30 | .\" SUCH DAMAGE. |
| | 31 | .\" |
| | 32 | .\" @(#)system.3 8.1 (Berkeley) 6/4/93 |
| | 33 | .\" $FreeBSD: src/lib/libc/stdlib/system.3,v 1.13 2008/06/26 08:24:59 danger Exp $ |
| | 34 | .\" |
| | 35 | .Dd June 4, 1993 |
| | 36 | .Dt SYSTEM 3 |
| | 37 | .Os |
| | 38 | .Sh NAME |
| | 39 | .Nm system |
| | 40 | .Nd pass a command to the shell |
| | 41 | .Sh LIBRARY |
| | 42 | .Lb libc |
| | 43 | .Sh SYNOPSIS |
| | 44 | .In stdlib.h |
| | 45 | .Ft int |
| | 46 | .Fn system "const char *string" |
| | 47 | .Sh DESCRIPTION |
| | 48 | The |
| | 49 | .Fn system |
| | 50 | function |
| | 51 | hands the argument |
| | 52 | .Fa string |
| | 53 | to the command interpreter |
| | 54 | .Xr sh 1 . |
| | 55 | The calling process waits for the shell |
| | 56 | to finish executing the command, |
| | 57 | ignoring |
| | 58 | .Dv SIGINT |
| | 59 | and |
| | 60 | .Dv SIGQUIT , |
| | 61 | and blocking |
| | 62 | .Dv SIGCHLD . |
| | 63 | .Pp |
| | 64 | If |
| | 65 | .Fa string |
| | 66 | is a |
| | 67 | .Dv NULL |
| | 68 | pointer, |
| | 69 | .Fn system |
| | 70 | will return non-zero if the command interpreter |
| | 71 | .Xr sh 1 |
| | 72 | is available, and zero if it is not. |
| | 73 | .Sh RETURN VALUES |
| | 74 | The |
| | 75 | .Fn system |
| | 76 | function |
| | 77 | returns the exit status of the shell as returned by |
| | 78 | .Xr waitpid 2 , |
| | 79 | or \-1 if an error occurred when invoking |
| | 80 | .Xr fork 2 |
| | 81 | or |
| | 82 | .Xr waitpid 2 . |
| | 83 | A return value of 127 means the execution of the shell |
| | 84 | failed. |
| | 85 | .Sh SEE ALSO |
| | 86 | .Xr sh 1 , |
| | 87 | .Xr execve 2 , |
| | 88 | .Xr fork 2 , |
| | 89 | .Xr waitpid 2 , |
| | 90 | .Xr popen 3 |
| | 91 | .Sh STANDARDS |
| | 92 | The |
| | 93 | .Fn system |
| | 94 | function |
| | 95 | conforms to |
| | 96 | .St -isoC |
| | 97 | and is expected to be |
| | 98 | .St -p1003.2 |
| | 99 | compatible. |
projects / apple / libc.git / blame_incremental