程序间通讯:FIFO

程序间通信:FIFO

参考自:

http://publib.boulder.ibm.com/infocenter/zos/v1r10/index.jsp?topic=/com.ibm.zos.r10.bpxbd00/rtmkf.htm

 

程序间通信可以使用命名管道FIFO,在硬盘中建立管道文件。具体实例如下:

 

/**
 *gcc -g -o fifo_w fifo_w.c `pkg-config gtk+-2.0 --cflags --libs gthread-2.0`
 *
 */

#define _POSIX_SOURCE
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

main() {
  char fn[]="/tmp/temp.fifo";
  char out[20]="FIFO's are fun!";
  int wfd;

  if (mkfifo(fn, S_IRWXU) != 0)
    perror("mkfifo() error");
  else {
      if ((wfd = open(fn, O_WRONLY)) < 0)
        perror("open() error for write end");
      else {
        if (write(wfd, out, strlen(out)+1) == -1)
          perror("write() error");
        close(wfd);
      }
  }
  unlink(fn);
}

 

/**
 *gcc -g -o fifo_r fifo_r.c `pkg-config gtk+-2.0 --cflags --libs gthread-2.0`
 *
 */
#define _POSIX_SOURCE
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

main() {
  char fn[]="/tmp/temp.fifo";
  char in[20];
  int rfd;

  if ((rfd = open(fn, O_RDONLY|O_NONBLOCK)) < 0)
    perror("open() error for read end");
  else {
      if (read(rfd, in, sizeof(in)) == -1)
        perror("read() error");
      else printf("read '%s' from the FIFO\n", in);
    }
  close(rfd);
}

 

运行结果:

terminal1:

[socol@localhost gtk]$ ./fifo_w

 

terminal2:
[socol@localhost gtk]$ ./fifo_r

read 'FIFO's are fun!' from the FIFO