_Exit

 

C

Language

headers

Type support

Dynamic memory management

Error handling

Program utilities

Variadic function support

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Thread support (C11)

Atomic operations (C11)

Technical Specifications

 

Program support utilities

Program termination
abort exit quick_exit (C11) _Exit (C99)	atexit at_quick_exit (C11) EXIT_SUCCESSEXIT_FAILURE
Communicating with the environment
system	getenvgetenv_s (C11)
Signals
signal raise sig_atomic_t	SIG_DFLSIG_IGN SIG_ERR
Signal types
SIGABRTSIGFPESIGILLSIGINTSIGSEGVSIGTERM
Non-local jumps
setjmp
longjmp
Types
jmp_buf

 

void _Exit( int exit_code );		(since C99) (until C11)
_Noreturn void _Exit( int exit_code );		(since C11)

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

Destructors of variables with automatic, thread local and static storage durations are not called. Functions passed to at_quick_exit() or atexit() are not called. Whether open resources such as files are closed is implementation defined. If exit_code is EXIT_FAILURE, an implementation-defined status, indicating unsuccessful termination, is returned. In other cases implementation-defined status value is returned.

Parameters

exit_code

-

exit status of the program

Return value

(none)

Example

Run this code

#include <stdlib.h>
#include <stdio.h>
 
/* _Exit does not call functions registered with atexit. */
void f1(void)
{
    puts("pushed first");
}
 
void f2(void)
{
    puts("pushed second");
}
 
int main(void)
{
    printf("Enter main()\n");
    atexit(f1);
    atexit(f2);
    fflush(stdout);   /* _Exit does not flush unwritten buffered data */
    _Exit(0);
}

Output:

Enter main()

References

• C11 standard (ISO/IEC 9899:2011):

• 7.22.4.5 The _Exit function (p: 352)

• C99 standard (ISO/IEC 9899:1999):

• 7.20.4.4 The _Exit function (p: 316)

See also

abort	causes abnormal program termination (without cleaning up) (function)
exit	causes normal program termination with cleaning up (function)
C++ documentation for _Exit