quick_exit

 

C

Compiler support

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

Algorithms

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 <stdlib.h>
_Noreturn void quick_exit( int exit_code );		(since C11) (until C23)
[[noreturn]] void quick_exit( int exit_code );		(since C23)

Causes normal program termination to occur without completely cleaning the resources.

Functions passed to at_quick_exit are called in reverse order of their registration. After calling the registered functions, calls _Exit(exit_code).

Functions passed to atexit or signal handlers passed to signal are not called.

Parameters

exit_code

-

exit status of the program

Return value

(none)

Example

Run this code

#include <stdlib.h>
#include <stdio.h>
 
void f1(void)
{
    puts("pushed first");
    fflush(stdout);
}
 
void f2(void)
{
    puts("pushed second");
}
 
void f3(void)
{
    puts("won't be called");
}
 
int main(void)
{
    at_quick_exit(f1);
    at_quick_exit(f2);
    atexit(f3);
    quick_exit(0);
}

Output:

pushed second
pushed first

References

• C17 standard (ISO/IEC 9899:2018):

• 7.22.4.7 The quick_exit function (p: 257)

• C11 standard (ISO/IEC 9899:2011):

• 7.22.4.7 The quick_exit function (p: 353)

See also

abort	causes abnormal program termination (without cleaning up) (function)
atexit	registers a function to be called on exit() invocation (function)
at_quick_exit (C11)	registers a function to be called on quick_exit invocation (function)
C++ documentation for quick_exit