| <html lang="en"> |
| <head> |
| <title>Alarm Signals - The GNU C Library</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="The GNU C Library"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Standard-Signals.html#Standard-Signals" title="Standard Signals"> |
| <link rel="prev" href="Termination-Signals.html#Termination-Signals" title="Termination Signals"> |
| <link rel="next" href="Asynchronous-I_002fO-Signals.html#Asynchronous-I_002fO-Signals" title="Asynchronous I/O Signals"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| This file documents the GNU C library. |
| |
| This is Edition 0.12, last updated 2007-10-27, |
| of `The GNU C Library Reference Manual', for version |
| 2.8 (Sourcery G++ Lite 2011.03-41). |
| |
| Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001, 2002, |
| 2003, 2007, 2008, 2010 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Free Software Needs Free Documentation'' |
| and ``GNU Lesser General Public License'', the Front-Cover texts being |
| ``A GNU Manual'', and with the Back-Cover Texts as in (a) below. A |
| copy of the license is included in the section entitled "GNU Free |
| Documentation License". |
| |
| (a) The FSF's Back-Cover Text is: ``You have the freedom to |
| copy and modify this GNU manual. Buying copies from the FSF |
| supports it in developing GNU and promoting software freedom.''--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Alarm-Signals"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Asynchronous-I_002fO-Signals.html#Asynchronous-I_002fO-Signals">Asynchronous I/O Signals</a>, |
| Previous: <a rel="previous" accesskey="p" href="Termination-Signals.html#Termination-Signals">Termination Signals</a>, |
| Up: <a rel="up" accesskey="u" href="Standard-Signals.html#Standard-Signals">Standard Signals</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">24.2.3 Alarm Signals</h4> |
| |
| <p>These signals are used to indicate the expiration of timers. |
| See <a href="Setting-an-Alarm.html#Setting-an-Alarm">Setting an Alarm</a>, for information about functions that cause |
| these signals to be sent. |
| |
| <p>The default behavior for these signals is to cause program termination. |
| This default is rarely useful, but no other default would be useful; |
| most of the ways of using these signals would require handler functions |
| in any case. |
| |
| <!-- signal.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>SIGALRM</b><var><a name="index-SIGALRM-2861"></a></var><br> |
| <blockquote><p>This signal typically indicates expiration of a timer that measures real |
| or clock time. It is used by the <code>alarm</code> function, for example. |
| </p></blockquote></div> |
| <a name="index-alarm-signal-2862"></a> |
| <!-- signal.h --> |
| <!-- BSD --> |
| |
| <div class="defun"> |
| — Macro: int <b>SIGVTALRM</b><var><a name="index-SIGVTALRM-2863"></a></var><br> |
| <blockquote><p>This signal typically indicates expiration of a timer that measures CPU |
| time used by the current process. The name is an abbreviation for |
| “virtual time alarm”. |
| </p></blockquote></div> |
| <a name="index-virtual-time-alarm-signal-2864"></a> |
| <!-- signal.h --> |
| <!-- BSD --> |
| |
| <div class="defun"> |
| — Macro: int <b>SIGPROF</b><var><a name="index-SIGPROF-2865"></a></var><br> |
| <blockquote><p>This signal typically indicates expiration of a timer that measures |
| both CPU time used by the current process, and CPU time expended on |
| behalf of the process by the system. Such a timer is used to implement |
| code profiling facilities, hence the name of this signal. |
| </p></blockquote></div> |
| <a name="index-profiling-alarm-signal-2866"></a> |
| |
| </body></html> |
| |
