PipeLine

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
/*
* hien thi msg & giao tiep giua cha-con
*/
void error(char *msg) {
perror(msg);
exit(-1);
}
void main() {
int p;
int tube[2];
char c;
int rep;
setbuf(stdout,NULL); /* std output khong dung vung dem Les entrées */
if (pipe(tube)==-1) /* tao pipe */
error("pipe");
p=fork(); /* tao con */
if (p==-1)
error("fork");
if (p==0) { /* QT con */
close(tube[1]);
while (read(tube[0], &c, sizeof(char))) { /* Doc tung char tu pipe.*/
if ((c<='z') && (c>='a')) {
printf("Con: <%c>\n",c);
}
}
close(tube[0]);
}
else { /* cha */
close(tube[0]);
printf("PID con: %d\n",p);
while ((rep=getchar())!=EOF) { /* Doc ky ty tu stdinput & goi qua
pipe. */
c=(char) rep;
write(tube[1],&c,sizeof(char));
}
close(tube[1]);
}
}