Commit | Line | Data |
---|---|---|
d8525fbd | 1 | /* |
d633e577 JA |
2 | * A tee implementation using sys_tee. Stores stdin input in the given file |
3 | * and duplicates that to stdout. | |
d8525fbd JA |
4 | */ |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <string.h> | |
9 | #include <fcntl.h> | |
10 | #include <string.h> | |
d8525fbd JA |
11 | #include <sys/types.h> |
12 | #include <errno.h> | |
13 | #include <assert.h> | |
14 | #include <limits.h> | |
15 | ||
16 | #include "splice.h" | |
17 | ||
0769b9c0 JA |
18 | static int splice_flags; |
19 | ||
d8525fbd JA |
20 | static int do_splice(int infd, int outfd, unsigned int len, char *msg) |
21 | { | |
22 | while (len) { | |
13b72067 | 23 | int written = ssplice(infd, NULL, outfd, NULL, len, splice_flags); |
d8525fbd JA |
24 | |
25 | if (written <= 0) | |
26 | return error(msg); | |
27 | ||
28 | len -= written; | |
29 | } | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
f91353a3 JA |
34 | static int usage(char *name) |
35 | { | |
0769b9c0 | 36 | fprintf(stderr, "... | %s: [-m(ove)] outfile\n", name); |
f91353a3 JA |
37 | return 1; |
38 | } | |
39 | ||
0769b9c0 JA |
40 | static int parse_options(int argc, char *argv[]) |
41 | { | |
42 | int c, index = 1; | |
43 | ||
44 | while ((c = getopt(argc, argv, "m")) != -1) { | |
45 | switch (c) { | |
46 | case 'm': | |
47 | splice_flags = SPLICE_F_MOVE; | |
48 | index++; | |
49 | break; | |
50 | default: | |
51 | return -1; | |
52 | } | |
53 | } | |
54 | ||
55 | return index; | |
56 | } | |
57 | ||
d8525fbd JA |
58 | int main(int argc, char *argv[]) |
59 | { | |
0769b9c0 | 60 | int fd, index; |
d8525fbd | 61 | |
f91353a3 JA |
62 | if (argc < 2) |
63 | return usage(argv[0]); | |
d8525fbd | 64 | |
76797253 | 65 | if (check_input_pipe()) |
f91353a3 | 66 | return usage(argv[0]); |
d8525fbd | 67 | |
0769b9c0 JA |
68 | index = parse_options(argc, argv); |
69 | if (index == -1 || index + 1 > argc) | |
70 | return usage(argv[0]); | |
71 | ||
72 | fd = open(argv[index], O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
d8525fbd JA |
73 | if (fd < 0) |
74 | return error("open output"); | |
75 | ||
76 | do { | |
13b72067 | 77 | int tee_len = stee(STDIN_FILENO, STDOUT_FILENO, INT_MAX, 0); |
d8525fbd JA |
78 | |
79 | if (tee_len < 0) { | |
80 | if (errno == EAGAIN) { | |
81 | usleep(1000); | |
82 | continue; | |
83 | } | |
84 | return error("tee"); | |
85 | } else if (!tee_len) | |
86 | break; | |
87 | ||
88 | /* | |
89 | * Send output to file, also consumes input pipe. | |
90 | */ | |
91 | if (do_splice(STDIN_FILENO, fd, tee_len, "splice-file")) | |
92 | break; | |
93 | } while (1); | |
94 | ||
95 | return 0; | |
96 | } |