54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#define _GNU_SOURCE
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#include <fcntl.h>
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#include <sys/sendfile.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char *argv[]) {
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if (argc != 3) {
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fprintf(stderr, "用法: %s <源文件> <目标文件>\n", argv[0]);
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return 1;
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}
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const char *src_path = argv[1];
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const char *dst_path = argv[2];
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int src_fd = open(src_path, O_RDONLY);
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if (src_fd < 0) {
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perror("打开源文件失败");
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return 1;
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}
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int dst_fd = open(dst_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if (dst_fd < 0) {
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perror("打开目标文件失败");
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close(src_fd);
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return 1;
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}
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struct stat stat_buf;
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if (fstat(src_fd, &stat_buf) < 0) {
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perror("fstat失败");
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close(src_fd);
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close(dst_fd);
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return 1;
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}
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off_t offset = 0;
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ssize_t sent = sendfile(dst_fd, src_fd, &offset, stat_buf.st_size);
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if (sent < 0) {
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perror("sendfile失败");
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close(src_fd);
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close(dst_fd);
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return 1;
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}
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printf("成功复制 %zd 字节，从 %s 到 %s\n", sent, src_path, dst_path);
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close(src_fd);
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close(dst_fd);
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return 0;
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}
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