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<title>execv</title>
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<h2 align=center>execv</h2>
<h4 align=center>OS/161 Reference Manual</h4>

<h3>Name</h3>
execv - execute a program

<h3>Library</h3>
Standard C Library (libc, -lc)

<h3>Synopsis</h3>
#include &lt;unistd.h&gt;<br>
<br>
int<br>
execv(const char *<em>program</em>, char **<em>args</em>);

<h3>Description</h3>

execv replaces the currently executing program with a newly loaded
program image. This occurs within one process; the process id is
unchanged.
<p>

The pathname of the program to run is passed as <em>program</em>. The
<em>args</em> argument is an array of 0-terminated strings. The array
itself should be terminated by a NULL pointer.
<p>

The argument strings should be copied into the new process as the
new process's argv[] array. In the new process, argv[argc] must be
NULL.
<p>

By convention, argv[0] in new processes contains the name that was
used to invoke the program. This is not necessarily the same as
<em>program</em>, and furthermore is only a convention and should not
be enforced by the kernel.
<p>

The process file table and current working directory are not modified
by execve.

<h3>Return Values</h3>
On success, execv does not return; instead, the new program begins
executing. On failure, execv returns -1, and sets
<A HREF=errno.html>errno</A> to a suitable error code for the error
condition encountered.

<h3>Errors</h3>

The following error codes should be returned under the conditions
given. Other error codes may be returned for other errors not
mentioned here.

<blockquote><table width=90%>
<tr><td width=10%>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td>ENODEV</td>		<td>The device prefix of <em>program</em> did
				not exist.</td></tr>
<tr><td>ENOTDIR</td>	<td>A non-final component of <em>program</em>
				was not a directory.</td></tr>
<tr><td>ENOENT</td>	<td><em>program</em> did not exist.</td></tr>
<tr><td>EISDIR</td>	<td><em>program</em> is a directory.</td></tr>
<tr><td>ENOEXEC</td>	<td><em>program</em> is not in a recognizable
				executable file format, was for the
				wrong platform, or contained invalid
				fields.</td></tr>
<tr><td>ENOMEM</td>	<td>Insufficient virtual memory is available.</td></tr>
<tr><td>E2BIG</td>		<td>The total size of the argument strings is
				too large.</td></tr>
<tr><td>EIO</td>	<td>A hard I/O error occurred.</td></tr>
<tr><td>EFAULT</td>	<td>One of the args is an invalid pointer.</td></tr>
</table></blockquote>

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