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我寫這個程序來測試FIFO中Ubuntu.The主程序創建子進程寫的東西，然後父讀取並打印無法打開FIFO
/*
communication with named pipe(or FIFO)
@author myqiqiang
@email [email protected]
*/
#include<sys/types.h>
#include<sys/stat.h>
#include<stdio.h>
#include<errno.h>
#include<fcntl.h>
#include<string.h>
#define FIFO_SERVER "/home/myqiqiang/fifoserver" //fifo directioy
#define BUFFERSIZE 80
void main()
{
pid_t pc;
int flag,fd;
char data[BUFFERSIZE+1];
char* test="a test string";
if(mkfifo(FIFO_SERVER,O_CREAT|O_EXCL)<0) //create fifo
{
printf("create named pipe failed\n");
exit(1);
}
printf("create named pipe sucessfully\n");
pc=fork(); //create process
if(pc==0)
{
memset(data,0,strlen(test));
fd=open(FIFO_SERVER,O_WRONLY,0); //open the fifo
if(fd==-1) //if open failed
{
printf("write:cann't open the named pipe\n");
unlink(FIFO_SERVER);
exit(1);
}
flag=write(fd,test,13); //write data
if(flag==-1) //write failed
{
printf("write data error\n");
unlink(FIFO_SERVER);
exit(1);
}
printf("write data successfully\n");
close(fd); //clsoe fifo
unlink(FIFO_SERVER); //delete fifo
}
else
if(pc>0)
{
memset(data,0,strlen(test));
fd=open(FIFO_SERVER,O_RDONLY,0);
if(fd==-1)
{
printf("read:cann't open the named pipe\n");
unlink(FIFO_SERVER);
exit(1);
}
flag=read(fd,data,13);
if(flag==-1)
{
printf("read data error\n");
unlink(FIFO_SERVER);
exit(1);
}
printf("the data is%s\n",data);
close(fd);
unlink(FIFO_SERVER);
}
else
{
printf("create process error!\n");
unlink(FIFO_SERVER);
exit(1);
}
}
但是，它顯示了這個每我執行的時間，我相信前鋒已經得到了證明。
[email protected]:~/code/ch03/experiment$ ./3
create named pipe sucessfully
read:cann't open the named pipe
write:cann't open the named pipe
當'mkfifo'或'open'失敗時使用'perror'。你想知道什麼是'errno' –