busybox/runit/runsvdir.c
Denys Vlasenko 22542eca18 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>
2017-08-08 21:55:02 +02:00

427 lines
11 KiB
C

/*
Copyright (c) 2001-2006, Gerrit Pape
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */
//config:config RUNSVDIR
//config: bool "runsvdir (6 kb)"
//config: default y
//config: help
//config: runsvdir starts a runsv process for each subdirectory, or symlink to
//config: a directory, in the services directory dir, up to a limit of 1000
//config: subdirectories, and restarts a runsv process if it terminates.
//config:
//config:config FEATURE_RUNSVDIR_LOG
//config: bool "Enable scrolling argument log"
//config: depends on RUNSVDIR
//config: default n
//config: help
//config: Enable feature where second parameter of runsvdir holds last error
//config: message (viewable via top/ps). Otherwise (feature is off
//config: or no parameter), error messages go to stderr only.
//applet:IF_RUNSVDIR(APPLET(runsvdir, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_RUNSVDIR) += runsvdir.o
//usage:#define runsvdir_trivial_usage
//usage: "[-P] [-s SCRIPT] DIR"
//usage:#define runsvdir_full_usage "\n\n"
//usage: "Start a runsv process for each subdirectory. If it exits, restart it.\n"
//usage: "\n -P Put each runsv in a new session"
//usage: "\n -s SCRIPT Run SCRIPT <signo> after signal is processed"
#include <sys/file.h>
#include "libbb.h"
#include "common_bufsiz.h"
#include "runit_lib.h"
#define MAXSERVICES 1000
/* Should be not needed - all dirs are on same FS, right? */
#define CHECK_DEVNO_TOO 0
struct service {
#if CHECK_DEVNO_TOO
dev_t dev;
#endif
ino_t ino;
pid_t pid;
smallint isgone;
};
struct globals {
struct service *sv;
char *svdir;
int svnum;
#if ENABLE_FEATURE_RUNSVDIR_LOG
char *rplog;
struct fd_pair logpipe;
struct pollfd pfd[1];
unsigned stamplog;
#endif
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define sv (G.sv )
#define svdir (G.svdir )
#define svnum (G.svnum )
#define rplog (G.rplog )
#define logpipe (G.logpipe )
#define pfd (G.pfd )
#define stamplog (G.stamplog )
#define INIT_G() do { setup_common_bufsiz(); } while (0)
static void fatal2_cannot(const char *m1, const char *m2)
{
bb_perror_msg_and_die("%s: fatal: can't %s%s", svdir, m1, m2);
/* was exiting 100 */
}
static void warn3x(const char *m1, const char *m2, const char *m3)
{
bb_error_msg("%s: warning: %s%s%s", svdir, m1, m2, m3);
}
static void warn2_cannot(const char *m1, const char *m2)
{
warn3x("can't ", m1, m2);
}
#if ENABLE_FEATURE_RUNSVDIR_LOG
static void warnx(const char *m1)
{
warn3x(m1, "", "");
}
#endif
/* inlining + vfork -> bigger code */
static NOINLINE pid_t runsv(const char *name)
{
pid_t pid;
/* If we got signaled, stop spawning children at once! */
if (bb_got_signal)
return 0;
pid = vfork();
if (pid == -1) {
warn2_cannot("vfork", "");
return 0;
}
if (pid == 0) {
/* child */
if (option_mask32 & 1) /* -P option? */
setsid();
/* man execv:
* "Signals set to be caught by the calling process image
* shall be set to the default action in the new process image."
* Therefore, we do not need this: */
#if 0
bb_signals(0
| (1 << SIGHUP)
| (1 << SIGTERM)
, SIG_DFL);
#endif
execlp("runsv", "runsv", name, (char *) NULL);
fatal2_cannot("start runsv ", name);
}
return pid;
}
/* gcc 4.3.0 does better with NOINLINE */
static NOINLINE int do_rescan(void)
{
DIR *dir;
struct dirent *d;
int i;
struct stat s;
int need_rescan = 0;
dir = opendir(".");
if (!dir) {
warn2_cannot("open directory ", svdir);
return 1; /* need to rescan again soon */
}
for (i = 0; i < svnum; i++)
sv[i].isgone = 1;
while (1) {
errno = 0;
d = readdir(dir);
if (!d)
break;
if (d->d_name[0] == '.')
continue;
if (stat(d->d_name, &s) == -1) {
warn2_cannot("stat ", d->d_name);
continue;
}
if (!S_ISDIR(s.st_mode))
continue;
/* Do we have this service listed already? */
for (i = 0; i < svnum; i++) {
if (sv[i].ino == s.st_ino
#if CHECK_DEVNO_TOO
&& sv[i].dev == s.st_dev
#endif
) {
if (sv[i].pid == 0) /* restart if it has died */
goto run_ith_sv;
sv[i].isgone = 0; /* "we still see you" */
goto next_dentry;
}
}
{ /* Not found, make new service */
struct service *svnew = realloc(sv, (i+1) * sizeof(*sv));
if (!svnew) {
warn2_cannot("start runsv ", d->d_name);
need_rescan = 1;
continue;
}
sv = svnew;
svnum++;
#if CHECK_DEVNO_TOO
sv[i].dev = s.st_dev;
#endif
sv[i].ino = s.st_ino;
run_ith_sv:
sv[i].pid = runsv(d->d_name);
sv[i].isgone = 0;
}
next_dentry: ;
}
i = errno;
closedir(dir);
if (i) { /* readdir failed */
warn2_cannot("read directory ", svdir);
return 1; /* need to rescan again soon */
}
/* Send SIGTERM to runsv whose directories
* were no longer found (-> must have been removed) */
for (i = 0; i < svnum; i++) {
if (!sv[i].isgone)
continue;
if (sv[i].pid)
kill(sv[i].pid, SIGTERM);
svnum--;
sv[i] = sv[svnum];
i--; /* so that we don't skip new sv[i] (bug was here!) */
}
return need_rescan;
}
int runsvdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int runsvdir_main(int argc UNUSED_PARAM, char **argv)
{
struct stat s;
dev_t last_dev = last_dev; /* for gcc */
ino_t last_ino = last_ino; /* for gcc */
time_t last_mtime;
int curdir;
unsigned stampcheck;
int i;
int need_rescan;
bool i_am_init;
char *opt_s_argv[3];
INIT_G();
opt_s_argv[0] = NULL;
opt_s_argv[2] = NULL;
getopt32(argv, "^" "Ps:" "\0" "-1", &opt_s_argv[0]);
argv += optind;
i_am_init = (getpid() == 1);
bb_signals(0
| (1 << SIGTERM)
| (1 << SIGHUP)
/* For busybox's init, SIGTERM == reboot,
* SIGUSR1 == halt,
* SIGUSR2 == poweroff,
* Ctlr-ALt-Del sends SIGINT to init,
* so we need to intercept SIGUSRn and SIGINT too.
* Note that we do not implement actual reboot
* (killall(TERM) + umount, etc), we just pause
* respawing and avoid exiting (-> making kernel oops).
* The user is responsible for the rest.
*/
| (i_am_init ? ((1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGINT)) : 0)
, record_signo);
svdir = *argv++;
#if ENABLE_FEATURE_RUNSVDIR_LOG
/* setup log */
if (*argv) {
rplog = *argv;
if (strlen(rplog) < 7) {
warnx("log must have at least seven characters");
} else if (piped_pair(logpipe)) {
warnx("can't create pipe for log");
} else {
close_on_exec_on(logpipe.rd);
close_on_exec_on(logpipe.wr);
ndelay_on(logpipe.rd);
ndelay_on(logpipe.wr);
if (dup2(logpipe.wr, 2) == -1) {
warnx("can't set filedescriptor for log");
} else {
pfd[0].fd = logpipe.rd;
pfd[0].events = POLLIN;
stamplog = monotonic_sec();
goto run;
}
}
rplog = NULL;
warnx("log service disabled");
}
run:
#endif
curdir = open(".", O_RDONLY|O_NDELAY);
if (curdir == -1)
fatal2_cannot("open current directory", "");
close_on_exec_on(curdir);
stampcheck = monotonic_sec();
need_rescan = 1;
last_mtime = 0;
for (;;) {
unsigned now;
unsigned sig;
/* collect children */
for (;;) {
pid_t pid = wait_any_nohang(NULL);
if (pid <= 0)
break;
for (i = 0; i < svnum; i++) {
if (pid == sv[i].pid) {
/* runsv has died */
sv[i].pid = 0;
need_rescan = 1;
}
}
}
now = monotonic_sec();
if ((int)(now - stampcheck) >= 0) {
/* wait at least a second */
stampcheck = now + 1;
if (stat(svdir, &s) != -1) {
if (need_rescan || s.st_mtime != last_mtime
|| s.st_ino != last_ino || s.st_dev != last_dev
) {
/* svdir modified */
if (chdir(svdir) != -1) {
last_mtime = s.st_mtime;
last_dev = s.st_dev;
last_ino = s.st_ino;
/* if the svdir changed this very second, wait until the
* next second, because we won't be able to detect more
* changes within this second */
while (time(NULL) == last_mtime)
usleep(100000);
need_rescan = do_rescan();
while (fchdir(curdir) == -1) {
warn2_cannot("change directory, pausing", "");
sleep(5);
}
} else {
warn2_cannot("change directory to ", svdir);
}
}
} else {
warn2_cannot("stat ", svdir);
}
}
#if ENABLE_FEATURE_RUNSVDIR_LOG
if (rplog) {
if ((int)(now - stamplog) >= 0) {
write(logpipe.wr, ".", 1);
stamplog = now + 900;
}
}
pfd[0].revents = 0;
#endif
{
unsigned deadline = (need_rescan ? 1 : 5);
#if ENABLE_FEATURE_RUNSVDIR_LOG
if (rplog)
poll(pfd, 1, deadline*1000);
else
#endif
sleep(deadline);
}
#if ENABLE_FEATURE_RUNSVDIR_LOG
if (pfd[0].revents & POLLIN) {
char ch;
while (read(logpipe.rd, &ch, 1) > 0) {
if (ch < ' ')
ch = ' ';
for (i = 6; rplog[i] != '\0'; i++)
rplog[i-1] = rplog[i];
rplog[i-1] = ch;
}
}
#endif
sig = bb_got_signal;
if (!sig)
continue;
bb_got_signal = 0;
/* -s SCRIPT: useful if we are init.
* In this case typically script never returns,
* it halts/powers off/reboots the system. */
if (opt_s_argv[0]) {
pid_t pid;
/* Single parameter: signal# */
opt_s_argv[1] = utoa(sig);
pid = spawn(opt_s_argv);
if (pid > 0) {
/* Remembering to wait for _any_ children,
* not just pid */
while (wait(NULL) != pid)
continue;
}
}
if (sig == SIGHUP) {
for (i = 0; i < svnum; i++)
if (sv[i].pid)
kill(sv[i].pid, SIGTERM);
}
/* SIGHUP or SIGTERM (or SIGUSRn if we are init) */
/* Exit unless we are init */
if (!i_am_init)
return (SIGHUP == sig) ? 111 : EXIT_SUCCESS;
/* init continues to monitor services forever */
} /* for (;;) */
}