| Program termination | |||||||||||||||||||||
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| Unreachable control flow | |||||||||||||||||||||
(C23) | |||||||||||||||||||||
| Communicating with the environment | |||||||||||||||||||||
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| Memory alignment query | |||||||||||||||||||||
(C23) | |||||||||||||||||||||
| Signals | |||||||||||||||||||||
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| Non-local jumps | |||||||||||||||||||||
| Types | |||||||||||||||||||||
Defined in header <stdlib.h> | ||
void _Exit(int exit_code); | (since C99) (until C11) | |
_Noreturnvoid _Exit(int exit_code); | (since C11) (until C23) | |
[[noreturn]]void _Exit(int exit_code); | (since C23) | |
Causes normal program termination to occur without completely cleaning the resources.
Functions passed toat_quick_exit() oratexit() are not called. Whether open streams with unwritten buffered data are flushed, open streams are closed, or temporary files are removed is implementation-defined.
Ifexit_code is0 orEXIT_SUCCESS, an implementation-defined status indicating successful termination is returned to the host environment. Ifexit_code isEXIT_FAILURE, an implementation-defined status, indicatingunsuccessful termination, is returned. In other cases an implementation-defined status value is returned.
Contents |
| exit_code | - | exit status of the program |
(none)
#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 may not flush unwritten buffered data */ _Exit(0);}
Output:
Enter main()
| causes abnormal program termination (without cleaning up) (function)[edit] | |
| causes normal program termination with cleaning up (function)[edit] | |
C++ documentation for_Exit | |
