SIG_ERR

 

C

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Program support utilities

Program termination
abort exit quick_exit (C++11) _Exit (C++11)	atexit at_quick_exit (C++11) EXIT_SUCCESSEXIT_FAILURE
Communicating with the environment
system	getenv
Signals
signal raise sig_atomic_t	SIG_DFLSIG_IGN SIG_ERR
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SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM
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setjmp
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jmp_buf

 

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

Run this code

#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()

See also

signal	sets a signal handler for particular signal (function)
C++ documentation for SIG_ERR