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Commit | Line | Data |
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51d0a545 HH |
1 | #define _GNU_SOURCE |
2 | #include <fcntl.h> | |
3 | #include <stdio.h> | |
4 | #include <stdlib.h> | |
5 | #include <unistd.h> | |
6 | #include <errno.h> | |
7 | #include <limits.h> | |
8 | ||
f59664a0 HH |
9 | #define BUFLEN 4096 |
10 | ||
51d0a545 HH |
11 | int |
12 | main(int argc, char *argv[]) | |
13 | { | |
14 | int fd; | |
15 | int len, slen; | |
16 | ||
17 | if (argc != 2) { | |
18 | fprintf(stderr, "Usage: %s <file>\n", argv[0]); | |
19 | exit(EXIT_FAILURE); | |
20 | } | |
21 | ||
22 | fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
23 | if (fd == -1) { | |
24 | perror("open"); | |
25 | exit(EXIT_FAILURE); | |
26 | } | |
27 | ||
28 | fprintf(stderr, "Logging to %s: ", argv[1]); | |
29 | ||
f59664a0 HH |
30 | slen = 0; |
31 | ||
51d0a545 HH |
32 | do { |
33 | len = splice(STDIN_FILENO, NULL, fd, NULL, | |
f59664a0 | 34 | BUFLEN, SPLICE_F_MOVE); |
51d0a545 HH |
35 | |
36 | if (len < 0) { | |
37 | if (errno == EAGAIN) | |
38 | continue; | |
39 | perror("tee"); | |
40 | exit(EXIT_FAILURE); | |
41 | } else | |
42 | if (len == 0) | |
43 | break; | |
f59664a0 HH |
44 | slen += len; |
45 | if ((slen/BUFLEN) > 0) { | |
46 | fprintf(stderr, "."); | |
47 | } | |
48 | slen = slen % BUFLEN; | |
49 | ||
51d0a545 HH |
50 | } while (1); |
51 | close(fd); | |
52 | fprintf(stderr, "\n"); | |
53 | exit(EXIT_SUCCESS); | |
f59664a0 | 54 | } |