fifo_write.c
#include <sys/types.h>
#include <sys/stat.h>#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FIFO "/tmp/myfifo"
main(int argc,char** argv)
{
/*參數爲即將寫入的字節數*/
int fd;
char w_buf[100];
int nwrite;
if(fd==-1)
{
if(errno)
{
printf("open error; no reading process\n");
}
}
/*打開FIFO管道,並設置非阻塞標誌*/
fd=open(FIFO,O_WRONLY|O_NONBLOCK,0);
if(argc==1)
{
printf("Please send something\n");
}
strcpy(w_buf,argv[1]);
/*向管道中寫入字符串*/
if((nwrite=write(fd,w_buf,100))==-1)
{
if(errno==EAGAIN)
{
printf("The FIFO has not been read yet. Please try later\n"
}
}
else
{
printf("write %s to the FIFO\n",w_buf);
}
}
fifo_read.c
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FIFO "/tmp/myfifo"
main(int argc,char** argv)
{
/*參數爲即將寫入的字節數*/
int fd;
char buf_r[100];
int nread;
/*創建有名管道,並設置相應的權限*/
if((mkfifo(FIFO,O_CREAT|O_EXCL)<0)&&(errno!=EEXIST))
{
printf("cannot creat fifoserver\n");
}
printf("Preparing for reading bytes\n");
memset(buf_r,0,sizeof(buf_r));
/*打開有名管道,並設置非阻塞標誌*/
fd=open(FIFO,O_RDONLY|O_NONBLOCK,0);
if(fd==-1)
{
perror("open====");
exit(1);
}
while(1)
{
memset(buf_r,0,sizeof(buf_r));
if((nread=read(fd,buf_r,100))==-1)
{
if(errno==EAGAIN)
{
}
}
printf("read %s from FIFO\n",buf_r);
sleep(1);
}
pause();
unlink(FIFO);
}
運行結果:
Preparing for reading bytes
read from FIFO
read from FIFO
read from FIFO
read Helloo from FIFO
read from FIFO
...