Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 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> |
Bernhard Reutner-Fischer | 73561cc | 2006-08-28 23:31:54 +0000 | [diff] [blame] | 6 | * Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 7 | * |
Rob Landley | 399d2b5 | 2006-05-25 23:02:40 +0000 | [diff] [blame] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 9 | */ |
| 10 | |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 11 | /* BB_AUDIT SUSv3 N/A */ |
| 12 | /* BB_AUDIT GNU defects -- only option -n is supported. */ |
| 13 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 14 | #include "libbb.h" |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 15 | |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 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) |
Bernhard Reutner-Fischer | 73561cc | 2006-08-28 23:31:54 +0000 | [diff] [blame] | 25 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 26 | int watch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | 68404f1 | 2008-03-17 09:00:54 +0000 | [diff] [blame] | 27 | int watch_main(int argc ATTRIBUTE_UNUSED, char **argv) |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 28 | { |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 29 | unsigned opt; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 30 | unsigned period = 2; |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 31 | unsigned width, new_width; |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 32 | char *header; |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 33 | char *cmd; |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 34 | |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 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); |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 38 | argv += optind; |
Rob Landley | 399d2b5 | 2006-05-25 23:02:40 +0000 | [diff] [blame] | 39 | |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 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 |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 45 | |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 46 | width = (unsigned)-1; // make sure first time new_width != width |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 47 | header = NULL; |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 48 | while (1) { |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 49 | printf("\033[H\033[J"); |
| 50 | if (!(opt & 0x2)) { // no -t |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 51 | const unsigned time_len = sizeof("1234-67-90 23:56:89"); |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 52 | time_t t; |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 53 | |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 54 | get_terminal_width_height(STDIN_FILENO, &new_width, NULL); |
| 55 | if (new_width != width) { |
| 56 | width = new_width; |
| 57 | free(header); |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 58 | header = xasprintf("Every %us: %-*s", period, (int)width, cmd); |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 59 | } |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 60 | time(&t); |
Denis Vlasenko | 28b2991 | 2008-02-24 14:33:17 +0000 | [diff] [blame] | 61 | if (time_len < width) |
| 62 | strftime(header + width - time_len, time_len, |
| 63 | "%Y-%m-%d %H:%M:%S", localtime(&t)); |
| 64 | |
Denis Vlasenko | 8d73c35 | 2006-10-20 23:48:30 +0000 | [diff] [blame] | 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); |
Rob Landley | 399d2b5 | 2006-05-25 23:02:40 +0000 | [diff] [blame] | 72 | sleep(period); |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 73 | } |
Denis Vlasenko | 703aa13 | 2006-10-23 22:43:02 +0000 | [diff] [blame] | 74 | return 0; // gcc thinks we can reach this :) |
Glenn L McGrath | 18b76e6 | 2002-09-16 09:10:04 +0000 | [diff] [blame] | 75 | } |