Created
February 27, 2014 18:32
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <sys/wait.h> | |
#include <sys/types.h> | |
#include <unistd.h> | |
#include <string.h> | |
#define N 10 | |
int main(int argc, char **argv) | |
{ | |
pid_t pid; // fork | |
int i, j, conto, max=0, | |
fd[2]; // pipe | |
char l; | |
if(argc != 2) | |
{ | |
printf("Usage: %s <numbers>\n",argv[0]); | |
return -1; | |
} | |
if(pipe(fd) < 0) | |
{ | |
puts("Errore nella pipe!"); | |
return -1; | |
} | |
for(i=0; i < N; i++) | |
{ | |
switch(pid = fork()) | |
{ | |
case -1: | |
puts("Errore nella fork!"); | |
exit(-1); | |
break; | |
case 0: | |
//Sono uno dei figli | |
l = (char)(((int)'0')+i); | |
conto = 0; | |
for(j=0; j < strlen(argv[1]); j++) | |
if(argv[1][j] == l) | |
conto++; | |
printf("FIGLIO: La lettera che ho cercato è: %c\n ed ha %d occorrenze\n", l, conto); | |
close(fd[0]); | |
write(fd[1], &conto, sizeof(int)); | |
exit(1); | |
break; | |
default: | |
//Sono il padre | |
wait(NULL); | |
} | |
} | |
close(fd[1]); | |
for(i=0; i < N; i++) | |
{ | |
read(fd[0], &conto, sizeof(int)); | |
if(conto > max) | |
max = i; | |
printf("PADRE: %d = %d\n", i, conto); | |
} | |
printf("Il risultato delle occorrenze maggiore è: %d\n", max); | |
return 0; | |
} |
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