mirror of https://github.com/t1meshift/os_labs.git
41 lines
789 B
C
41 lines
789 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/wait.h>
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// A macro to simplify my life
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#define FORK_TASK(IN_FORK, IN_THIS) { \
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int f = fork(); \
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switch (f) { \
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case -1: perror("fork() returned an error!"); exit(1); \
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case 0: IN_FORK; exit(0); \
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default: IN_THIS; \
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} \
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}
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int main() {
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// Task 1
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printf("\n\nTask 1\n");
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int x = 100;
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FORK_TASK(
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{
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// `x' is copied from parent process
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assert(x == 100);
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x = 50;
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},
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{
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printf("Fork executed, pid: %d\n", f);
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x = 20;
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assert(x == 20);
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int kk = wait(NULL);
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printf("AFTER wait, pid: %d\n", kk);
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assert(x == 20);
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}
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)
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alarm(2);
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return 0;
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}
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