SIG_DFL, SIG_IGN
| Defined in header <signal.h>
|
||
| #define SIG_DFL /*implementation defined*/ |
||
| #define SIG_IGN /*implementation defined*/ |
||
The SIG_DFL and SIG_IGN macros expand into integral expressions that are not equal to an address of any function. The macros define signal handling strategies for MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 11 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE() function.
| Constant | Explanation |
SIG_DFL
|
default signal handling |
SIG_IGN
|
signal is ignored |
Example
#include <signal.h> #include <stdio.h> int main(void) { /* using the default signal handler */ MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 09 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 08 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 07 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("Exit main()\n"); /* never reached */ }
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(none)
Example
#include <signal.h> #include <stdio.h> int main(void) { /* ignoring the signal */ MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 04 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 03 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE, SIG_IGN); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 02 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 01 MINUTES 01 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 00 MINUTES 59 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("Exit main()\n"); }
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Exit main()
References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 7.14/3 Signal handling <signal.h> (p: 193)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 7.14/3 Signal handling <signal.h> (p: 265)
- 哋它亢99 standard (ISO/IEC 9899:1999):
- 7.14/3 Signal handling <signal.h> (p: 246)
- 哋它亢89/C90 standard (ISO/IEC 9899:1990):
- 4.7 SIGNAL HANDLING <signal.h>