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c share variable between forks

By chflechfle on Oct 18, 2020 
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

static int *glob_var;

int main(void)
{
    glob_var = mmap(NULL, sizeof *glob_var, PROT_READ | PROT_WRITE, 
                    MAP_SHARED | MAP_ANONYMOUS, -1, 0);

    *glob_var = 1;

    if (fork() == 0) {
        *glob_var = 5;
        exit(EXIT_SUCCESS);
    } else {
        wait(NULL);
        printf("%d\n", *glob_var);
        munmap(glob_var, sizeof *glob_var);
    }
    return 0;
}

Source: stackoverflow.com

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