exit
From cppreference.com
Defined in header <stdlib.h>
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void exit( int exit_code ); |
(until C11) | |
_Noreturn void exit( int exit_code ); |
(since C11) | |
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_code
is zero or EXIT_SUCCESS, an implementation-defined status, indicating successful termination is returned. Ifexit_code
is EXIT_FAILURE, an implementation-defined status, indicating unsuccessful termination is returned. In other cases implementation-defined status value is returned.
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
.
Parameters
exit_code | - | exit status of the program |
Return value
(none)
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()
References
- 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
See also
causes abnormal program termination (without cleaning up) (function) | |
registers a function to be called on exit() invocation (function) | |
(C11) |
causes normal program termination without completely cleaning up (function) |