When a parent process forks, we understand that the child is created; it is a copy of the parent. This will include the VAS, and, thus, the data and stack segments. Keeping this fact in mind, check out the following code snippet (ch10/fork5.c):
static int g=7;[...]int main(int argc, char **argv) [...] int loc=8; switch((ret = fork())) { case -1 : FATAL("fork failed, aborting!\n"); case 0 : /* Child */ printf("Child process, PID %d:\n", getpid()); loc ++; g --; printf( " loc=%d g=%d\n", loc, g); printf("Child (%d) done, exiting ...\n", getpid()); exit(EXIT_SUCCESS); default : /* Parent */ #if 1 sleep(2); /* let the child run first */ #endif printf("Parent process, PID %d:\n", getpid()); loc --; g ++; printf( " loc=%d ...
