projects / unix-history / blame
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1 | .\" Copyright (c) 1990 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" %sccs.include.redist.man% | |
| 5 | .\" | |
| 58e8ceb7 | 6 | .\" @(#)system.3 6.3 (Berkeley) %G% |
| 6363d9ff | 7 | .\" |
| 929cacff | 8 | .TH SYSTEM 3 "" |
| 6363d9ff KM |
9 | .AT 3 |
| 10 | .SH NAME | |
| 11 | system \- issue a shell command | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
| a83c1154 | 14 | .ft B |
| 58e8ceb7 KB |
15 | #include <stdlib.h> |
| 16 | ||
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17 | system(const char *string); |
| 18 | .ft R | |
| 6363d9ff KM |
19 | .fi |
| 20 | .SH DESCRIPTION | |
| 21 | .I System | |
| a83c1154 | 22 | hands |
| 6363d9ff | 23 | .I string |
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24 | to the command interpreter |
| 25 | .IR sh (1). | |
| 26 | The calling process waits until the shell has completed, | |
| 27 | ignoring SIGINT and SIGQUIT, and blocking SIGCHLD. | |
| 28 | .PP | |
| 29 | If | |
| 30 | .I string | |
| 31 | is a NULL pointer, | |
| 32 | .I system | |
| 33 | will return non-zero if the command interpreter | |
| 34 | .IR sh (1) | |
| 35 | is available, and zero if it is not. | |
| 36 | .PP | |
| 37 | .I System | |
| 38 | returns the exit status of the shell, or \-1 if the | |
| 39 | .IR wait (3) | |
| 40 | for the shell failed. | |
| 41 | A return status of 127 indicates that the execution of the shell | |
| 42 | failed. | |
| 6363d9ff | 43 | .SH "SEE ALSO" |
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44 | sh(1), execve(2), wait(2), popen(3) |
| 45 | .SH STANDARDS | |
| 46 | .B System | |
| 47 | conforms to ANSI X3.159-1989 (``ANSI C''). |