75 lines
1.1 KiB
C
75 lines
1.1 KiB
C
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <signal.h>
|
|
void seq(int n)
|
|
{
|
|
for(int i = 2; i <= n; i++)
|
|
write(STDOUT_FILENO, &i, sizeof i);
|
|
exit(0);
|
|
}
|
|
void filtre(int prime)
|
|
{
|
|
while(1){
|
|
int n;
|
|
ssize_t nb_read = read(STDIN_FILENO, &n, sizeof n);
|
|
if (nb_read <= 0)
|
|
break;
|
|
if ((n%prime) != 0)
|
|
write(STDOUT_FILENO, &n, sizeof n);
|
|
|
|
}
|
|
exit(0);
|
|
}
|
|
int main(int argc, char *argv[])
|
|
{
|
|
|
|
pid_t p;
|
|
int fd[2];
|
|
struct sigaction sa = {0};
|
|
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGCHLD, &sa, NULL);
|
|
|
|
int N = strtol(argv[1], NULL, 0);
|
|
assert(pipe(fd) == 0);
|
|
|
|
p = fork();
|
|
|
|
if (p == 0){
|
|
close(fd[0]);
|
|
dup2(fd[1],STDOUT_FILENO);
|
|
close(fd[1]);
|
|
seq(N);
|
|
}
|
|
close(fd[1]);
|
|
dup2(fd[0],STDIN_FILENO);
|
|
close(fd[0]);
|
|
|
|
while(1){
|
|
int prime;
|
|
int fdd[2];
|
|
ssize_t nb_read = read(STDIN_FILENO, &prime, sizeof prime);
|
|
if (nb_read <= 0)
|
|
break;
|
|
printf("%d\n",prime);
|
|
assert(pipe(fdd) == 0);
|
|
p = fork();
|
|
if (p == 0){
|
|
close(fdd[0]);
|
|
dup2(fdd[1],STDOUT_FILENO);
|
|
close(fdd[1]);
|
|
filtre(prime);
|
|
}
|
|
close(fdd[1]);
|
|
dup2(fdd[0], STDIN_FILENO);
|
|
close(fdd[0]);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
}
|