Contents of /tags/mkinitrd-6_3_1/busybox/procps/watch.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/procps/watch.c
File MIME type: text/plain
File size: 2453 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/procps/watch.c
File MIME type: text/plain
File size: 2453 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
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 | #if 0 // maybe ENABLE_DESKTOP? |
36 | // procps3 compat - "echo TEST | watch cat" doesn't show TEST: |
37 | close(STDIN_FILENO); |
38 | xopen("/dev/null", O_RDONLY); |
39 | #endif |
40 | |
41 | opt_complementary = "-1:n+"; // at least one param; -n NUM |
42 | // "+": stop at first non-option (procps 3.x only) |
43 | opt = getopt32(argv, "+dtn:", &period); |
44 | argv += optind; |
45 | |
46 | // watch from both procps 2.x and 3.x does concatenation. Example: |
47 | // watch ls -l "a /tmp" "2>&1" - ls won't see "a /tmp" as one param |
48 | cmd = *argv; |
49 | while (*++argv) |
50 | cmd = xasprintf("%s %s", cmd, *argv); // leaks cmd |
51 | |
52 | width = (unsigned)-1; // make sure first time new_width != width |
53 | header = NULL; |
54 | while (1) { |
55 | printf("\033[H\033[J"); |
56 | if (!(opt & 0x2)) { // no -t |
57 | const unsigned time_len = sizeof("1234-67-90 23:56:89"); |
58 | time_t t; |
59 | |
60 | // STDERR_FILENO is procps3 compat: |
61 | // "watch ls 2>/dev/null" does not detect tty size |
62 | get_terminal_width_height(STDERR_FILENO, &new_width, NULL); |
63 | if (new_width != width) { |
64 | width = new_width; |
65 | free(header); |
66 | header = xasprintf("Every %us: %-*s", period, (int)width, cmd); |
67 | } |
68 | time(&t); |
69 | if (time_len < width) |
70 | strftime(header + width - time_len, time_len, |
71 | "%Y-%m-%d %H:%M:%S", localtime(&t)); |
72 | |
73 | // compat: empty line between header and cmd output |
74 | printf("%s\n\n", header); |
75 | } |
76 | fflush_all(); |
77 | // TODO: 'real' watch pipes cmd's output to itself |
78 | // and does not allow it to overflow the screen |
79 | // (taking into account linewrap!) |
80 | system(cmd); |
81 | sleep(period); |
82 | } |
83 | return 0; // gcc thinks we can reach this :) |
84 | } |