1<html lang="en"> 2<head> 3<title>exit - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Stdlib.html#Stdlib" title="Stdlib"> 9<link rel="prev" href="gvcvt.html#gvcvt" title="gvcvt"> 10<link rel="next" href="getenv.html#getenv" title="getenv"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="exit"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="getenv.html#getenv">getenv</a>, 31Previous: <a rel="previous" accesskey="p" href="gvcvt.html#gvcvt">gvcvt</a>, 32Up: <a rel="up" accesskey="u" href="Stdlib.html#Stdlib">Stdlib</a> 33<hr> 34</div> 35 36<h3 class="section">2.17 <code>exit</code>—end program execution</h3> 37 38<p><a name="index-exit-30"></a><strong>Synopsis</strong> 39<pre class="example"> #include <stdlib.h> 40 void exit(int <var>code</var>); 41 42</pre> 43 <p><strong>Description</strong><br> 44Use <code>exit</code> to return control from a program to the host operating 45environment. Use the argument <var>code</var> to pass an exit status to the 46operating environment: two particular values, <code>EXIT_SUCCESS</code> and 47<code>EXIT_FAILURE</code>, are defined in `<code>stdlib.h</code>' to indicate success or 48failure in a portable fashion. 49 50 <p><code>exit</code> does two kinds of cleanup before ending execution of your 51program. First, it calls all application-defined cleanup functions 52you have enrolled with <code>atexit</code>. Second, files and streams are 53cleaned up: any pending output is delivered to the host system, each 54open file or stream is closed, and files created by <code>tmpfile</code> are 55deleted. 56 57 <p><br> 58<strong>Returns</strong><br> 59<code>exit</code> does not return to its caller. 60 61 <p><br> 62<strong>Portability</strong><br> 63ANSI C requires <code>exit</code>, and specifies that <code>EXIT_SUCCESS</code> and 64<code>EXIT_FAILURE</code> must be defined. 65 66 <p>Supporting OS subroutines required: <code>_exit</code>. 67 68 <p><br> 69 70 </body></html> 71 72