有名管道的应用

来源：互联网发布：excel数据有效性英文编辑：程序博客网时间：2024/04/29 10:51

通过创建两个管道可以实现进程间的全双工通信，同样也可以通过创建两个FIFO来实现不同进程间的全双工通信。

Server端#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <errno.h>#define FIFO_READ   "readfifo"#define FIFO_WRITE  "writefifo"#define BUF_SIZE    1024int main(int argc, char *argv[]){    int wfd, rfd;    char buf[BUF_SIZE];    int len;    umask(0);    if (mkfifo(FIFO_WRITE, S_IFIFO | 0666)) {        printf("Can't create FIFO %s because %s",FIFO_WRITE,strerror(errno));        exit(1);    }    umask(0);    wfd = open(FIFO_WRITE,O_WRONLY);    if (wfd == -1) {        printf("open FIFO %s error: %s",FIFO_WRITE,strerror(errno));        exit(1);    }    while ((rfd = open(FIFO_READ,O_RDONLY)) == -1) {        sleep(1);    }    while (1) {        printf("Server: ");        fgets(buf, BUF_SIZE, stdin);        buf[strlen(buf)-1] = '\0';        if (strncmp(buf, "quit", 4) == 0) {            close(wfd);            unlink(FIFO_WRITE);            close(rfd);            exit(0);        }        write(wfd,buf,strlen(buf));        len = read(rfd, buf, BUF_SIZE);        if (len > 0) {            buf[len] = '\0';            printf("Client: %s\n",buf);        }    }    return 0;}

Client端#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/stat.h>#include <string.h>#include <errno.h>#include <fcntl.h>#include <unistd.h>#define FIFO_READ   "writefifo"#define FIFO_WRITE  "readfifo"#define BUF_SIZE    1024int main(int argc, char *argv[]){    int wfd, rfd;    char buf[BUF_SIZE];    int len;    umask(0);    if (mkfifo(FIFO_WRITE, S_IFIFO | 0666)) {        printf("Can't create FIFO %s because %s",FIFO_WRITE,strerror(errno));        exit(1);    }    while ((rfd = open(FIFO_READ, O_RDONLY)) == -1) {        sleep(1);    }    wfd = open(FIFO_WRITE, O_WRONLY);    if (wfd == -1) {        printf("Fail to open FIFO %s : %s",FIFO_WRITE,strerror(errno));        exit(-1);    }    while (1) {        len = read(rfd, buf, BUF_SIZE);        if (len > 0) {            buf[len] = '\0';            printf("Server: %s\n",buf);        }        printf("Client: ");        fgets(buf, BUF_SIZE, stdin);        buf[strlen(buf)-1] = '\0';        if (strncmp(buf, "quit", 4) == 0) {            close(wfd);            unlink(FIFO_WRITE);            close(rfd);            exit(0);        }        write(wfd, buf, strlen(buf));    }    return 0;}

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