busybox/procps/watch.c

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2002-09-16 14:40:04 +05:30
/* 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)
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*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
//config:config WATCH
//config: bool "watch (4.4 kb)"
//config: default y
//config: help
//config: watch is used to execute a program periodically, showing
//config: output to the screen.
//applet:IF_WATCH(APPLET(watch, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_WATCH) += watch.o
//usage:#define watch_trivial_usage
//usage: "[-n SEC] [-t] PROG ARGS"
//usage:#define watch_full_usage "\n\n"
//usage: "Run PROG periodically\n"
//usage: "\n -n Loop period in seconds (default 2)"
//usage: "\n -t Don't print header"
//usage:
//usage:#define watch_example_usage
//usage: "$ watch date\n"
//usage: "Mon Dec 17 10:31:40 GMT 2000\n"
//usage: "Mon Dec 17 10:31:42 GMT 2000\n"
//usage: "Mon Dec 17 10:31:44 GMT 2000"
/* BB_AUDIT SUSv3 N/A */
/* BB_AUDIT GNU defects -- only option -n is supported. */
#include "libbb.h"
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#define ESC "\033"
// 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;
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int watch_main(int argc UNUSED_PARAM, char **argv)
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{
unsigned opt;
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unsigned period = 2;
unsigned width, new_width;
char *header;
char *cmd;
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#if 0 // maybe ENABLE_DESKTOP?
// procps3 compat - "echo TEST | watch cat" doesn't show TEST:
close(STDIN_FILENO);
xopen("/dev/null", O_RDONLY);
#endif
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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// "+": stop at first non-option (procps 3.x only); -n NUM
// at least one param
opt = getopt32(argv, "^+" "dtn:+" "\0" "-1", &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
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width = (unsigned)-1; // make sure first time new_width != width
header = NULL;
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while (1) {
/* home; clear to the end of screen */
printf(ESC"[H" ESC"[J");
if (!(opt & 0x2)) { // no -t
const unsigned time_len = sizeof("1234-67-90 23:56:89");
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// STDERR_FILENO is procps3 compat:
// "watch ls 2>/dev/null" does not detect tty size
new_width = get_terminal_width(STDERR_FILENO);
if (new_width != width) {
width = new_width;
free(header);
header = xasprintf("Every %us: %-*s", period, (int)width, cmd);
}
if (time_len < width) {
strftime_YYYYMMDDHHMMSS(
header + width - time_len,
time_len,
/*time_t*:*/ NULL
);
}
// compat: empty line between header and cmd output
printf("%s\n\n", header);
}
fflush_all();
// 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);
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}
return 0; // gcc thinks we can reach this :)
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}