exit
From cppreference.com
C
Concurrency support (C11)
Program support utilities
Program termination
Unreachable control flow
(C23)
Communicating with the environment
(C11)
Memory alignment query
(C23)
Signals
Signal types
Non-local jumps
Types
Defined in header
<stdlib.h>
void exit( int exit_code );
(until C11)
_Noreturn void exit( int exit_code );
(since C11) (until C23)
[[noreturn]] void exit( int exit_code );
(since C23)
Causes normal program termination to occur.
Several cleanup steps are performed:
- functions passed to atexit are called, in reverse order of registration
- all C streams are flushed and closed
- files created by tmpfile are removed
- control is returned to the host environment. If
exit_codeis zero or EXIT_SUCCESS , an implementation-defined status indicating successful termination is returned. Ifexit_codeis EXIT_FAILURE , an implementation-defined status indicating unsuccessful termination is returned. In other cases implementation-defined status value is returned.
[edit] Notes
The functions registered with at_quick_exit are not called.
The behavior is undefined if a program calls exit more than once, or if it calls exit and quick_exit
The behavior is undefined if during a call to a function registered with atexit , the function exits with longjmp .
Returning from the the main function, either by a return statement or by reaching the end of the function, executes exit(), passing the argument of the return statement (or 0 if implicit return was used) as exit_code.
[edit] Parameters
exit_code
-
exit status of the program
[edit] Return value
(none)
[edit] Example
Run this code
#include <stdio.h> #include <stdlib.h> int main(void) { FILE *fp = fopen ("data.txt","r"); if (fp == NULL ) { fprintf (stderr, "error opening file data.txt in function main()\n"); exit( EXIT_FAILURE ); } fclose (fp); printf ("Normal Return\n"); return EXIT_SUCCESS ; }
Possible output:
error opening file data.txt in function main()
[edit] References
- C17 standard (ISO/IEC 9899:2018):
- 7.22.4.4 The exit function (p: 256)
- C11 standard (ISO/IEC 9899:2011):
- 7.22.4.4 The exit function (p: 351-352)
- C99 standard (ISO/IEC 9899:1999):
- 7.20.4.3 The exit function (p: 315-316)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.10.4.3 The exit function
[edit] See also
C++ documentation for exit