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#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
int main() {
int f1 = open("read.txt", O_RDONLY);
if (f1 < 0) {
perror("open read.txt");
return 1;
}
int f2 = open("write.txt", O_CREAT | O_WRONLY | O_TRUNC, 0755);
if (f2 < 0) {
perror("open write.txt");
return 1;
}
pid_t fpid = fork();
if (fpid < 0) {
perror("fork");
return 2;
}
if (fpid == 0) { // child
for (int i = 0; i < 5; i++) {
sleep(2);
write(f2, "abc", 3);
}
}
else {
char buff[3];
for (int i = 0; i < 5; i++) {
read(f1, buff, 3);
write(f2, buff, 3);
sleep(1);
}
}
}
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