Question

How to implement functions that will called when process is terminated with exit function in C

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static void atexitF1(void) {
    printf("atexitF1\n");
}

static void atexitF2(void) {
    printf("atexitF2\n");
}

int main() {
    if (atexit(atexitF1) != 0) {
        perror("atexit");
        exit(EXIT_FAILURE);
    }

    if (atexit(atexitF2) != 0) {
        perror("atexit");
        exit(EXIT_FAILURE);
    }

    printf("Executing program...\n");
    sleep(2);

    exit(EXIT_SUCCESS);
}


 
 
 
/*
run
 
Executing program...
atexitF2
atexitF1
 
*/

 

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