atexit with _exit C interview question


atexit with _exit C interview question


Question: In the code below, the atexit() function is not being called. Can you tell why?
#include

void func(void)
{
    printf("\n Cleanup function called \n");
    return;
}

int main(void)
{
    int i = 0;

    atexit(func);

    for(;i<0xffffff _exit="" i="" pre="">
Answer: This behavior is due to the use of function _exit(). This function does not call the clean-up functions like atexit() etc. If atexit() is required to be called then exit() or ‘return’ should be used.

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