Created
March 31, 2017 18:16
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06_dup2
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#include <stdlib.h> | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <time.h> | |
#include <sys/types.h> | |
#include <sys/wait.h> | |
void main() | |
{ | |
int fd[2]; | |
int pid; | |
//time_t start = time(NULL), end; | |
//if (pid = fork() == 0){ | |
if (pipe(fd) == -1) { | |
printf("No se pudo crear el pipe\n"); | |
exit(-1); | |
} | |
if ((pid = fork()) == -1) { | |
printf("no se pudo crear un hijo\n"); | |
exit(-1); | |
} | |
if (pid == 0) { //soy hijo | |
dup2(fd[1], STDOUT_FILENO); | |
//close(STDOUT_FILENO); // cierra descriptor 1 | |
//dup(mi_pipe[1]); // duplica descriptor mi_pipe[1] con 1 | |
close(fd[0]); // cierra lado de lectura del pipe | |
//close(fd[1]); | |
execlp("ls", "ls", (char*)NULL); // si esto funciona no hay retorno | |
} | |
else { | |
dup2(fd[0], STDIN_FILENO); | |
//close(STDIN_FILENO); // cierra descriptor 0 | |
//dup(mi_pipe[0]); // duplica descriptor mi_pipe[0] con 0 | |
close(fd[1]); // cierra lado de escritura | |
//close(fd[0]); | |
execlp("wc", "wc", "-l", (char*)NULL); // si esto funciona no hay retorno | |
} | |
/*}else{ | |
wait(NULL); | |
end = time(NULL); | |
printf("Time: %ld\n", start); | |
printf("Time: %ld\n", end); | |
printf("Time: %ld\n", end - start); | |
printf("Time: %.f\n", difftime(start, end)); | |
}*/ | |
} |
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