101 lines
3.3 KiB
HTML
101 lines
3.3 KiB
HTML
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<html>
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<head>
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<title>execvp</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>execvp</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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execvp - execute a program found on the search path
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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 <unistd.h></tt><br>
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<br>
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<tt>int</tt><br>
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<tt>execvp(const char *</tt><em>program</em><tt>,
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char **</tt><em>args</em><tt>);</tt>
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</p>
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<h3>Description</h3>
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<p>
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<tt>execvp</tt> searches for <em>program</em> on the program search
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path and execs it with <A HREF=../syscall/execv.html>execv</A> if
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found. If <em>program</em> is not found or a serious error occurs, it
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returns.
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</p>
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<p>
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If <em>program</em> contains a slash, no search is done; the specified
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string is passed directly to <tt>execv</tt>.
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</p>
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<p>
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The <em>args</em> argument should be prepared exactly as for
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<tt>execv</tt>.
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</p>
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<p>
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The search path is a colon-delimited list of directories retrieved by
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calling <A HREF=getenv.html>getenv</A> to retrieve the <tt>PATH</tt>
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environment variable. Unless you implement <tt>execve</tt> and
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environment variable passing, the value used is from a default
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environment compiled into libc. This path searches the <tt>/bin</tt>,
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<tt>/sbin</tt>, and <tt>/testbin</tt> directories.
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</p>
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<h3>Return Values</h3>
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<p>
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On success, <tt>execvp</tt> does not return; instead, the new program
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begins executing. On failure, <tt>execvp</tt> returns -1, and sets
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<A HREF=errno.html>errno</A> to a suitable error code for the error
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condition encountered.
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</p>
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<h3>Errors</h3>
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<p>
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<tt>execvp</tt> can fail for any of the reasons <tt>execv</tt> can.
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In addition, it produces ENOENT if the requested program is not
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found.
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</p>
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</body>
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</html>
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