7.20.4.3 The exit function

Synopsis

1

#include <stdlib.h>
void exit(int status);

Description

2

The exit function causes normal program termination to occur. If more than one call to the exit function is executed by a program, the behavior is undefined.

3

First, all functions registered by the atexit function are called, in the reverse order of their registration,[1] except that a function is called after any previously registered functions that had already been called at the time it was registered. If, during the call to any such function, a call to the longjmp function is made that would terminate the call to the registered function, the behavior is undefined.

4

Next, all open streams with unwritten buffered data are flushed, all open streams are closed, and all files created by the tmpfile function are removed.

5

Finally, control is returned to the host environment. If the value of status is zero or EXIT_SUCCESS, an implementation-defined form of the status successful termination is returned. If the value of status is EXIT_FAILURE, an implementation-defined form of the status unsuccessful termination is returned. Otherwise the status returned is implementation-defined.

Returns

6

The exit function cannot return to its caller.

Footnotes

[1]

Each function is called as many times as it was registered, and in the correct order with respect to other registered functions.