C signal handling: Difference between revisions

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{{C_Standard Library}}

In the [[C Standard Library]], '''signal processing''' defines how a program handles various [[Signal (computing)|signals]] while it executes. A signal can report some exceptional behavior within the program (''such as [[division by zero]]''), or a signal can report some asynchronous event outside the program (''such as someone striking an [[SIGINT (POSIX)|interactive attention key]] on a keyboard'').

==Standard signals==

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*<code>SIGABRT</code> – "abort", abnormal termination.

*<code>SIGFPE</code> – [[Floatingfloating point exception|'''f'''loating '''p'''oint '''e'''xception]].

*<code>SIGILL</code> – "illegal", invalid instruction.

*<code>SIGINT</code> – "interrupt", interactive attention request sent to the program.

*<code>SIGSEGV</code> – "[[segmentation violation|'''seg'''mentation '''v'''iolation]]", invalid memory access.

*<code>SIGTERM</code> – "terminate", termination request sent to the program.

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|}

==Example usage==

لغة النظام

<syntaxhighlight lang="c">

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

volatile sig_atomic_t status = 0;

static void catch_function(int signo) {

status = signo;

puts("Interactive attention signal caught.");

}

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}

puts("Raising the interactive attention signal.");

if (raise(SIGINT) != 0) {

fputs("Error raising the signal.\n", stderr);

return EXIT_FAILURE;

}

if (status == SIGINT) puts("Interactive attention signal caught.");

puts("Exiting.");

return EXIT_SUCCESS;