文件复制系统调用版

最新推荐文章于 2023-08-16 14:52:40 发布

原创最新推荐文章于 2023-08-16 14:52:40 发布 · 488 阅读

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本文展示了一个使用 Linux FIFO 实现进程间通信的 C 语言示例程序。该程序通过打开两个 FIFO 文件（一个用于写入，另一个用于读取），实现了简单的数据交换。程序不断向写 FIFO 发送消息，并从读 FIFO 接收数据，直至收到特定结束指令。

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>

int main()
{
char buffer[512] = "Hello Linux\n";
char buf_read[512] = {0};
int fd_read;
int fd_write;
ssize_t nbytes;
char run_data[10] = {0};
int i;

fd_write = open("/home/aa", O_WRONLY);
if (-1 == fd_write)
{
perror("open");
return -1;
}

fd_read = open("/home/bb", O_RDONLY);
if (-1 == fd_read)
{
perror("open");
return -1;
}

printf("Open FIFO success...\n");

while (1)
{
nbytes = write(fd_write, buffer, strlen(buffer));
if (-1 == nbytes)
{
perror("write");
return -1;
}
printf("write %d bytes\n", nbytes);
memset (buffer, 0, sizeof(buffer));

memset(buf_read, 0, sizeof(buf_read));
nbytes = read(fd_read, buf_read, sizeof(buf_read));
if (-1 == nbytes)
{
perror("read");
return -1;
}
printf("Read %d bytes, the content is %s\n", nbytes, buf_read);

fgets(buffer, 10, stdin);
if (strncmp("over", run_data, 4) == 0)
{
break;
}
}

return 0;
}