SIG_ERR
From cppreference.com
| Defined in header <signal.h>
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#define SIG_ERR /* implementation defined */
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A value of type void (*)(int). When returned by signal, indicates that an error has occurred.
Example
Run this code
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
void signal_handler(int sig)
{
printf("Received signal: %d\n", sig);
}
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
- C17 standard (ISO/IEC 9899:2018):
- 7.14/3 Signal handling <signal.h> (p: 194)
- 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
| |
