92 lines
3.1 KiB
HTML
92 lines
3.1 KiB
HTML
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-->
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<html>
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<head>
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<title>system</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>system</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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system - run command as subprocess
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</p>
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<h3>Library</h3>
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<p>
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Standard C Library (libc, -lc)
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>#include <stdlib.h></tt><br>
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<br>
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<tt>int</tt><br>
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<tt>system(const char *</tt><em>command</em><tt>);</tt>
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</p>
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<h3>Description</h3>
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<p>
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The <tt>system</tt> routine executes <em>command</em> as if it were
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typed into the shell.
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</p>
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<h3>Return Values</h3>
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<p>
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On success, system returns the exit status returned from
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<A HREF=../syscall/waitpid.html>waitpid</A>.
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On error, -1 is returned, and <A HREF=../syscall/errno.html>errno</A>
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is set according to the error encountered.
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</p>
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<h3>Errors</h3>
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<p>
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Any of the errors from <A HREF=../syscall/fork.html>fork</A> or
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<A HREF=../syscall/waitpid.html>waitpid</A>. Errors generated during
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<A HREF=../syscall/execv.html>execv</A> cannot readily be reported
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back in detail.
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</p>
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<h3>Restrictions</h3>
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<p>
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In OS/161 there may be no shell and when there is the shell's behavior
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and syntax is not specified. For this reason we make no assumptions
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about the shell's operation, and assume <tt>system</tt> cannot
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reliably use the shell to parse and execute <em>command</em>.
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Instead, <tt>system</tt> does this itself, in a way which may not
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necessarily be compatible with the shell as it finally appears. You
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may want to change <tt>system</tt> to invoke the shell in a suitable
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fashion when/if a shell is available.
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</p>
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</body>
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</html>
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