86 lines
1.3 KiB
C
86 lines
1.3 KiB
C
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#include <math.h>
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#include <fcntl.h>
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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 <assert.h>
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#include <sys/wait.h>
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void filter(int p)
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{
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while(1){
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int n;
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ssize_t nb_read = read(STDIN_FILENO,&n,sizeof(int));
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if (nb_read <= 0)
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break;
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if ((n%p) !=0)
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write(STDOUT_FILENO,&n,sizeof(int));
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}
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exit(0);
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}
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void seq(int N)
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{
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for(int i = 2;i <= N; i++)
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write(STDOUT_FILENO,&i,sizeof(i));
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exit(0);
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}
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int master()
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{
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int count_primes = 0;
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while(1){
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ssize_t nb_read;
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pid_t p;
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int t[2];
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int prime;
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nb_read = read(STDIN_FILENO,&prime,sizeof(int));
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if (nb_read <=0)
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break;
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printf("prime = %d\n",prime);
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count_primes ++;
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assert(pipe(t) == 0);
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p = fork();
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if (p == 0){
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close(t[0]);
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dup2(t[1],STDOUT_FILENO);
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close(t[1]);
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filter(prime);
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}
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close(t[1]);
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dup2(t[0],STDIN_FILENO);
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close(t[0]);
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}
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return count_primes;
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}
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int main(int argc, char *argv[])
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{
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int t[2];
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pid_t p;
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struct sigaction sa = {0};
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int max = (int)strtol(argv[1],NULL,0);
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sa.sa_flags = SA_NOCLDWAIT;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGCHLD, &sa , NULL);
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assert(pipe(t) == 0);
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p = fork();
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if (p == 0){
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close(t[0]);
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dup2(t[1],STDOUT_FILENO);
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close(t[1]);
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seq(max);
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}
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close(t[1]);
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dup2(t[0],STDIN_FILENO);
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close(t[0]);
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printf("densité = %lf\n",master()*1.0/max);
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return 0;
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}
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