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#include <unistd.h> // fork, write, close, sleep
#include <fcntl.h> // open
#include <stdio.h> // perror
int main(int argc, char* argv[]) {
pid_t f = fork();
int file = open("test.txt", O_WRONLY);
if (file < 0) {
perror("open");
return 1;
}
if (f == 0) { // in child
char buf = 'c';
for (int i = 0; i < 5; i++) {
sleep(2);
if(write(file, &buf, 1) < 0) {
perror("write");
return 2;
}
}
}
else {
char buf = 'p';
for (int i = 0; i < 5; i++) {
if(write(file, &buf, 1) < 0) {
perror("write");
return 3;
}
sleep(1);
}
}
close(file);
}
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