| 词条 | C signal handling | ||||||
| 释义 |
In the C Standard Library, signal processing defines how a program handles various 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 interactive attention key on a keyboard). Standard signals{{also|Unix signal}}The C standard defines only 6 signals. They are all defined in
Additional signals may be specified in the HandlingA signal can be generated by calling A signal handler is a function which is called by the target environment when the corresponding signal occurs. The target environment suspends execution of the program until the signal handler returns or calls Signal handlers can be set be with If the signal reports an error within the program (and the signal is not asynchronous), the signal handler can terminate by calling Functions
Example usage
static void catch_function(int signo) { } int main(void) { if (signal(SIGINT, catch_function) == SIG_ERR) { fputs("An error occurred while setting a signal handler.\", stderr); return EXIT_FAILURE; } puts("Raising the interactive attention signal."); if (raise(SIGINT) != 0) { fputs("Error raising the signal.\", stderr); return EXIT_FAILURE; } puts("Exiting."); return EXIT_SUCCESS; // exiting after raising signal} See also
References1. ^{{cite book | url=http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf | title=ISO/IEC 9899:1999 specification | at=p. 258, § 7.14 Signal handling}} {{Use dmy dates|date=January 2012}}2. ^{{cite web | url=http://pubs.opengroup.org/onlinepubs/007904975/ | title=The Open Group Base Specifications Issue 6 - signal.h - signals | accessdate=10 January 2012}} 3. ^https://www.cs.drexel.edu/cgi-bin/manServer.pl/signal.2 Signal(2) manpage 1 : C standard library |
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