← 返回第 15 章 套接字和标准 I/O

syscpy.c

#include <stdio.h>
#include <fcntl.h>
#define BUF_SIZE 3

int main(int argc, char *argv[])
{
    int fd1, fd2;
    int len;
    char buf[BUF_SIZE];

    fd1 = open("news.txt", O_RDONLY);
    fd2 = open("cpy.txt", O_WRONLY | O_CREAT | O_TRUNC);

    while ((len = read(fd1, buf, sizeof(buf))) > 0)
        write(fd2, buf, len);

    close(fd1);
    close(fd2);

    return 0;
}