Contents of /tags/mkinitrd-6_1_7/busybox/procps/watch.c
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Fri Oct 16 13:40:14 2009 UTC (14 years, 11 months ago) by niro
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Fri Oct 16 13:40:14 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 2139 byte(s)
tagged 'mkinitrd-6_1_7'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini watch implementation for busybox |
4 | * |
5 | * Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de> |
6 | * Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
9 | */ |
10 | |
11 | /* BB_AUDIT SUSv3 N/A */ |
12 | /* BB_AUDIT GNU defects -- only option -n is supported. */ |
13 | |
14 | #include "libbb.h" |
15 | |
16 | // procps 2.0.18: |
17 | // watch [-d] [-n seconds] |
18 | // [--differences[=cumulative]] [--interval=seconds] command |
19 | // |
20 | // procps-3.2.3: |
21 | // watch [-dt] [-n seconds] |
22 | // [--differences[=cumulative]] [--interval=seconds] [--no-title] command |
23 | // |
24 | // (procps 3.x and procps 2.x are forks, not newer/older versions of the same) |
25 | |
26 | int watch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
27 | int watch_main(int argc UNUSED_PARAM, char **argv) |
28 | { |
29 | unsigned opt; |
30 | unsigned period = 2; |
31 | unsigned width, new_width; |
32 | char *header; |
33 | char *cmd; |
34 | |
35 | opt_complementary = "-1:n+"; // at least one param; -n NUM |
36 | // "+": stop at first non-option (procps 3.x only) |
37 | opt = getopt32(argv, "+dtn:", &period); |
38 | argv += optind; |
39 | |
40 | // watch from both procps 2.x and 3.x does concatenation. Example: |
41 | // watch ls -l "a /tmp" "2>&1" -- ls won't see "a /tmp" as one param |
42 | cmd = *argv; |
43 | while (*++argv) |
44 | cmd = xasprintf("%s %s", cmd, *argv); // leaks cmd |
45 | |
46 | width = (unsigned)-1; // make sure first time new_width != width |
47 | header = NULL; |
48 | while (1) { |
49 | printf("\033[H\033[J"); |
50 | if (!(opt & 0x2)) { // no -t |
51 | const unsigned time_len = sizeof("1234-67-90 23:56:89"); |
52 | time_t t; |
53 | |
54 | get_terminal_width_height(STDIN_FILENO, &new_width, NULL); |
55 | if (new_width != width) { |
56 | width = new_width; |
57 | free(header); |
58 | header = xasprintf("Every %us: %-*s", period, (int)width, cmd); |
59 | } |
60 | time(&t); |
61 | if (time_len < width) |
62 | strftime(header + width - time_len, time_len, |
63 | "%Y-%m-%d %H:%M:%S", localtime(&t)); |
64 | |
65 | puts(header); |
66 | } |
67 | fflush(stdout); |
68 | // TODO: 'real' watch pipes cmd's output to itself |
69 | // and does not allow it to overflow the screen |
70 | // (taking into account linewrap!) |
71 | system(cmd); |
72 | sleep(period); |
73 | } |
74 | return 0; // gcc thinks we can reach this :) |
75 | } |