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#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
pid_t fpid = fork();
if (fpid < 0) {
perror("fork");
return 1;
}
int f = open("test.txt", O_CREAT | O_WRONLY | O_APPEND, 0755);
if (f < 0) {
perror("open test.txt");
return 2;
}
if (fpid == 0) { // in child
sleep(2);
int ws = write(f, "From Child 1\n", 13);
if (ws < 0) {
perror("write from child");
return 3;
}
sleep(5);
ws = write(f, "From Child 2\n", 13);
if (ws < 0) {
perror("write from child");
return 3;
}
}
else {
int ws = write(f, "From Parent 1\n", 14);
if (ws < 0) {
perror("write from child");
return 3;
}
sleep(3);
ws = write(f, "From Parent 2\n", 14);
if (ws < 0) {
perror("write from child");
return 3;
}
sleep(5);
}
}
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