raise

 

C

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Language

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Program utilities

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Error handling

Dynamic memory management

Strings library

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Numerics

Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Symbol index

 

Program support utilities

Program termination
abort exit quick_exit (C11) _Exit (C99)	atexit at_quick_exit (C11) EXIT_SUCCESSEXIT_FAILURE
Unreachable control flow
unreachable (C23)
Communicating with the environment
getenvgetenv_s (C11)	system
Memory alignment query
memalignment (C23)
Signals
signal raise sig_atomic_t	SIG_DFLSIG_IGN SIG_ERR
Signal types
SIGABRTSIGFPESIGILL	SIGINTSIGSEGVSIGTERM
Non-local jumps
setjmp	longjmp
Types
jmp_buf

 

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: SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM 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

• C17 standard (ISO/IEC 9899:2018):

• 7.14.2.1 The raise function (p: 194-195)

• 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

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