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

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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：

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/** *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);}

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/** *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);}

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运行结果：

terminal1:

[socol@localhost gtk]$ ./fifo_w

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

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