hush/procps/watch.c
Denis Vlasenko 68404f13d4 *: add -Wunused-parameter; fix resulting breakage
function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped
2008-03-17 09:00:54 +00:00

76 lines
2.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini watch implementation for busybox
*
* Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
* Copyrigjt (C) Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 N/A */
/* BB_AUDIT GNU defects -- only option -n is supported. */
#include "libbb.h"
// procps 2.0.18:
// watch [-d] [-n seconds]
// [--differences[=cumulative]] [--interval=seconds] command
//
// procps-3.2.3:
// watch [-dt] [-n seconds]
// [--differences[=cumulative]] [--interval=seconds] [--no-title] command
//
// (procps 3.x and procps 2.x are forks, not newer/older versions of the same)
int watch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int watch_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
unsigned opt;
unsigned period = 2;
int width, new_width;
char *header;
char *cmd;
opt_complementary = "-1:n+"; // at least one param; -n NUM
// "+": stop at first non-option (procps 3.x only)
opt = getopt32(argv, "+dtn:", &period);
argv += optind;
// watch from both procps 2.x and 3.x does concatenation. Example:
// watch ls -l "a /tmp" "2>&1" -- ls won't see "a /tmp" as one param
cmd = *argv;
while (*++argv)
cmd = xasprintf("%s %s", cmd, *argv); // leaks cmd
width = -1; // make sure first time new_width != width
header = NULL;
while (1) {
printf("\033[H\033[J");
if (!(opt & 0x2)) { // no -t
const int time_len = sizeof("1234-67-90 23:56:89");
time_t t;
get_terminal_width_height(STDIN_FILENO, &new_width, NULL);
if (new_width != width) {
width = new_width;
free(header);
header = xasprintf("Every %us: %-*s", period, width, cmd);
}
time(&t);
if (time_len < width)
strftime(header + width - time_len, time_len,
"%Y-%m-%d %H:%M:%S", localtime(&t));
puts(header);
}
fflush(stdout);
// TODO: 'real' watch pipes cmd's output to itself
// and does not allow it to overflow the screen
// (taking into account linewrap!)
system(cmd);
sleep(period);
}
return 0; // gcc thinks we can reach this :)
}