raise

< c‎ | program
 
C
 
Program support utilities
Program termination
Communicating with the environment
Signals
Signal types
Non-local jumps
Types
 
Defined in header <signal.h>
int raise( int sig );

Sends signal sig to the program. The signal handler, specified using signal(), is invoked.

If the user-defined signal handling strategy is not set using signal() yet, it is implementation-defined whether the signal will be ignored or default handler will be invoked.

Parameters

sig - the signal to be sent. It can be an implementation-defined value or one of the following values:
defines signal types
(macro constant)


Return value

​0​ upon success, non-zero value on failure.

Example

Run this code
#include <signal.h>
#include <stdio.h>
 
void signal_handler(int signal)
{
    printf("Received signal %d\n", signal);
}
 
int main(void)
{
    // Install a signal handler.
    signal(SIGTERM, signal_handler);
 
    printf("Sending signal %d\n", SIGTERM);
    raise(SIGTERM);
    printf("Exit main()\n");
}

Output: 

Sending signal 15
Received signal 15
Exit main()

References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.14.2.1 The raise function (p: 267)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.14.2.1 The raise function (p: 248)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.7.2.1 The raise function

See also

 sets a signal handler for particular signal
(function)