Defined in header <signal.h> | ||
---|---|---|
#define SIG_ERR /* implementation defined */ |
A value of type void (*)(int)
. When returned by signal
, indicates that an error has occurred.
Example
#include <stdio.h> #include <stdlib.h> #include <signal.h> void signal_handler(int signal) { printf("Received signal %d\n", signal); } int main(void) { /* Install a signal handler. */ if (signal(SIGTERM, signal_handler) == SIG_ERR) { printf("Error while installing a signal handler.\n"); exit(EXIT_FAILURE); } printf("Sending signal %d\n", SIGTERM); if (raise(SIGTERM) != 0) { printf("Error while raising the SIGTERM signal.\n"); exit(EXIT_FAILURE); } printf("Exit main()\n"); return EXIT_SUCCESS; }
Output:
Sending signal 15 Received signal 15 Exit main()
References
- C11 standard (ISO/IEC 9899:2011):
- 7.14/3 Signal handling <signal.h> (p: 265)
- C99 standard (ISO/IEC 9899:1999):
- 7.14/3 Signal handling <signal.h> (p: 246)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.7 SIGNAL HANDLING <signal.h>
See also
sets a signal handler for particular signal (function) | |
C++ documentation for SIG_ERR |
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