Format
#include <stdlib.h>
int atexit(void (*func)(void));Language Level: ANSI
Threadsafe: Yes.
Description
The atexit() function records the function, pointed to by func, that the system calls at normal program end. For portability, you should use the atexit() function to register a maximum of 32 functions. The functions are processed in a last-in, first-out order. The atexit() function cannot be called from the OPM default activation group. Most functions can be used with the atexit function; however, if the exit function is used the atexit function will fail.
Return Value
The atexit() function returns 0 if it is successful, and nonzero if it fails.
Example that uses atexit()
This example uses the atexit() function to call goodbye() at program end.
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
void goodbye(void);
int rc;
rc = atexit(goodbye);
if (rc != 0)
perror("Error in atexit");
exit(0);
}
void goodbye(void)
/* This function is called at normal program end */
{
printf("The function goodbye was called at program end\n");
}
/**************** Output should be similar to: ******************
The function goodbye was called at program end
*/Related Information