Linux管道編程執行個體，linux編程執行個體

Linux管道編程執行個體，linux編程執行個體

#include <unistd.h>#include <signal.h>#include <stdio.h>char parent[] = "a message from parrent";char child[] = "a message from child";main (){    int chan1[2], chan2[2];    int pid;    char buf[100];    pipe(chan1);    pipe(chan2);    pid=fork();    if(pid > 0)    {        close(chan1[0]);        close(chan2[1]);        write(chan1[1], parent, sizeof(parent));        close(chan1[1]);        read(chan2[0],buf, 100);        printf("%s\n", buf);        close(chan2[0]);    }    else if(pid == 0)    {        close(chan1[1]);        close(chan2[0]);        read(chan1[0], buf, 100);        printf("%s\n", buf);        write(chan2[1], child, sizeof(child));        close(chan2[1]);        close(chan1[0]);    }}

linux管道編程問題

就是C語言的
 
linux管道編程 100解

//具體不懂得地方你晚上再問我吧
#include<unistd.h>
#include<stdio.h>
#include<sys/types.h>
#include<stdlib.h>
#include<fcntl.h>
#include<string.h>

int main(int argc, char *argv) {
int fd[2];
int len;
pid_t pid;
char filename[10];
char childbuf[10];
if (pipe(fd) < 0) {
perror("pipe error!");
exit(1);
}
if ((pid = fork()) < 0) {
perror("fork error!");
exit(1);
}
if (pid == 0) {

close(fd[1]);
len = read(fd[0], childbuf, 100);
childbuf[len] = '\0';
printf("%s\n", childbuf);
if (execlp("cat", "cat", childbuf, (char*) 0) < 0) {
perror("exec error!");
exit(1);
}
} else {
close(fd[0]);
printf("請輸入檔案名稱\n");
scanf("%s", filename);
write(fd[1], filename, strlen(filename));
waitpid(pid, NULL, 0);
return 0;
}
}