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https://github.com/topjohnwu/ndk-busybox.git
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start_stop_daemon: add -test, fix -x to not match by inode,
vastly improve hext text. (mostly by Roy Marples <roy AT marples.name>) function old new delta packed_usage 24124 24190 +66 start_stop_daemon_main 959 991 +32 start_stop_daemon_longopts 149 156 +7 check 1632 1589 -43 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/1 up/down: 105/-43) Total: 62 bytes
This commit is contained in:
Denis Vlasenko
parent
faf334aeb8
commit
e125a683a7
@ -23,15 +23,18 @@ If --start if given, start a new process unless a matching process was found.
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Options controlling process matching:
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-u,--user USERNAME|UID Only consider this user's processes
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-n,--name PROCESS_NAME Look for processes with matching argv[0]
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or /proc/$PID/exe or /proc/$PID/stat (comm field).
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-n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
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with comm field in /proc/$PID/stat.
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Only basename is compared:
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"ntpd" == "./ntpd" == "/path/to/ntpd".
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[TODO: can PROCESS_NAME be a full pathname? Should we require full match then
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with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
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-x,--exec EXECUTABLE Look for processes with matching /proc/$PID/exe.
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Match is performed using device+inode.
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-x,--exec EXECUTABLE Look for processes that were started with this
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command in /proc/$PID/cmdline.
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Unlike -n, we match against the full path:
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"ntpd" != "./ntpd" != "/path/to/ntpd"
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-p,--pidfile PID_FILE Look for processes with PID from this file
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If multiple conditions are specified, all must match.
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Options which are valid for --start only:
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-x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
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@ -41,8 +44,13 @@ Options which are valid for --start only:
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-c,--chuid USER[:[GRP]] Change to specified user [and group]
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-m,--make-pidfile Write PID to the pidfile
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(both -m and -p must be given!)
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Misc options:
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Options which are valid for --stop only:
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-s,--signal SIG Signal to send (default:TERM)
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-t,--test Exit with status 0 if process is found
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(we don't actually start or stop daemons)
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Misc options:
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-o,--oknodo Exit with status 0 if nothing is done
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-q,--quiet Quiet
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-v,--verbose Verbose
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@ -64,19 +72,21 @@ enum {
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CTX_START = (1 << 1),
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OPT_BACKGROUND = (1 << 2), // -b
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OPT_QUIET = (1 << 3), // -q
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OPT_MAKEPID = (1 << 4), // -m
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OPT_a = (1 << 5), // -a
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OPT_n = (1 << 6), // -n
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OPT_s = (1 << 7), // -s
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OPT_u = (1 << 8), // -u
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OPT_c = (1 << 9), // -c
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OPT_x = (1 << 10), // -x
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OPT_p = (1 << 11), // -p
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OPT_OKNODO = (1 << 12) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
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OPT_VERBOSE = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
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OPT_NICELEVEL = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
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OPT_TEST = (1 << 4), // -t
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OPT_MAKEPID = (1 << 5), // -m
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OPT_a = (1 << 6), // -a
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OPT_n = (1 << 7), // -n
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OPT_s = (1 << 8), // -s
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OPT_u = (1 << 9), // -u
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OPT_c = (1 << 10), // -c
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OPT_x = (1 << 11), // -x
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OPT_p = (1 << 12), // -p
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OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
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OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
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OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
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};
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#define QUIET (option_mask32 & OPT_QUIET)
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#define TEST (option_mask32 & OPT_TEST)
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struct globals {
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struct pid_list *found;
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@ -86,7 +96,6 @@ struct globals {
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char *pidfile;
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int user_id;
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smallint signal_nr;
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struct stat execstat;
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define found (G.found )
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@ -96,20 +105,23 @@ struct globals {
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#define pidfile (G.pidfile )
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#define user_id (G.user_id )
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#define signal_nr (G.signal_nr )
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#define execstat (G.execstat )
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#define INIT_G() \
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do { \
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user_id = -1; \
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signal_nr = 15; \
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} while (0)
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#ifdef OLDER_VERSION_OF_X
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/* -x,--exec EXECUTABLE
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* Look for processes with matching /proc/$PID/exe.
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* Match is performed using device+inode.
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*/
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static int pid_is_exec(pid_t pid)
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{
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struct stat st;
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char buf[sizeof("/proc//exe") + sizeof(int)*3];
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sprintf(buf, "/proc/%u/exe", pid);
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sprintf(buf, "/proc/%u/exe", (unsigned)pid);
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if (stat(buf, &st) < 0)
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return 0;
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if (st.st_dev == execstat.st_dev
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@ -117,24 +129,29 @@ static int pid_is_exec(pid_t pid)
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return 1;
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return 0;
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}
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#endif
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static int pid_is_user(int pid)
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static int pid_is_exec(pid_t pid)
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{
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struct stat sb;
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char buf[sizeof("/proc/") + sizeof(int)*3];
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ssize_t bytes;
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char buf[PATH_MAX];
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sprintf(buf, "/proc/%u", pid);
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if (stat(buf, &sb) != 0)
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return 0;
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return (sb.st_uid == (uid_t)user_id);
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sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
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bytes = open_read_close(buf, buf, sizeof(buf) - 1);
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if (bytes > 0) {
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buf[bytes] = '\0';
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return strcmp(buf, execname) == 0;
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}
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return 0;
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}
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static int pid_is_cmd(pid_t pid)
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static int pid_is_name(pid_t pid)
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{
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char buf[256]; /* is it big enough? */
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/* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
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char buf[32]; /* should be enough */
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char *p, *pe;
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sprintf(buf, "/proc/%u/stat", pid);
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sprintf(buf, "/proc/%u/stat", (unsigned)pid);
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if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
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return 0;
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buf[sizeof(buf) - 1] = '\0'; /* paranoia */
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@ -145,7 +162,23 @@ static int pid_is_cmd(pid_t pid)
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if (!pe)
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return 0;
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*pe = '\0';
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return !strcmp(p, cmdname);
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/* we require comm to match and to not be truncated */
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/* in Linux, if comm is 15 chars, it may be a truncated
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* name, so we don't allow that to match */
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if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
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return 0;
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return strcmp(p, cmdname) == 0;
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}
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static int pid_is_user(int pid)
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{
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struct stat sb;
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char buf[sizeof("/proc/") + sizeof(int)*3];
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sprintf(buf, "/proc/%u", (unsigned)pid);
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if (stat(buf, &sb) != 0)
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return 0;
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return (sb.st_uid == (uid_t)user_id);
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}
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static void check(int pid)
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@ -155,10 +188,10 @@ static void check(int pid)
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if (execname && !pid_is_exec(pid)) {
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return;
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}
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if (userspec && !pid_is_user(pid)) {
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if (cmdname && !pid_is_name(pid)) {
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return;
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}
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if (cmdname && !pid_is_cmd(pid)) {
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if (userspec && !pid_is_user(pid)) {
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return;
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}
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p = xmalloc(sizeof(*p));
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@ -195,10 +228,11 @@ static void do_procinit(void)
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procdir = xopendir("/proc");
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pid = 0;
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while(1) {
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while (1) {
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errno = 0; /* clear any previous error */
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entry = readdir(procdir);
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// TODO: check for exact errno(s) which mean that we got stale entry
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// TODO: this check is too generic, it's better
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// to check for exact errno(s) which mean that we got stale entry
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if (errno) /* Stale entry, process has died after opendir */
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continue;
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if (!entry) /* EOF, no more entries */
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@ -225,12 +259,13 @@ static int do_stop(void)
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} else if (execname) {
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if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
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if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
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} else if (pidfile)
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} else if (pidfile) {
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what = xasprintf("process in pidfile '%s'", pidfile);
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else if (userspec)
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} else if (userspec) {
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what = xasprintf("process(es) owned by '%s'", userspec);
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else
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} else {
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bb_error_msg_and_die("internal error, please report");
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}
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if (!found) {
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if (!QUIET)
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@ -239,18 +274,18 @@ static int do_stop(void)
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goto ret;
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}
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for (p = found; p; p = p->next) {
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if (kill(p->pid, signal_nr) == 0) {
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p->pid = - p->pid;
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if (TEST || kill(p->pid, signal_nr) == 0) {
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killed++;
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} else {
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bb_perror_msg("warning: killing process %u", p->pid);
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p->pid = 0;
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bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
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}
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}
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if (!QUIET && killed) {
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printf("stopped %s (pid", what);
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for (p = found; p; p = p->next)
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if (p->pid < 0)
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printf(" %u", - p->pid);
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if (p->pid)
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printf(" %u", (unsigned)p->pid);
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puts(")");
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}
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ret:
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@ -265,6 +300,7 @@ static const char start_stop_daemon_longopts[] ALIGN1 =
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"start\0" No_argument "S"
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"background\0" No_argument "b"
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"quiet\0" No_argument "q"
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"test\0" No_argument "t"
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"make-pidfile\0" No_argument "m"
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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"oknodo\0" No_argument "o"
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@ -291,6 +327,7 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
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char *signame;
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char *startas;
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char *chuid;
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struct stat execstat;
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#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
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// char *retry_arg = NULL;
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// int retries = -1;
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@ -310,7 +347,7 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
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/* -q turns off -v */
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opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
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USE_FEATURE_START_STOP_DAEMON_FANCY("q-v");
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opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
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opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
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USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
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// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
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&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
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@ -338,9 +375,6 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
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if (errno)
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user_id = xuname2uid(userspec);
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}
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if (execname)
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xstat(execname, &execstat);
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do_procinit(); /* Both start and stop needs to know current processes */
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if (opt & CTX_STOP) {
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@ -353,6 +387,10 @@ int start_stop_daemon_main(int argc ATTRIBUTE_UNUSED, char **argv)
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printf("%s already running\n%d\n", execname, found->pid);
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return !(opt & OPT_OKNODO);
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}
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if (execname)
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xstat(execname, &execstat);
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*--argv = startas;
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if (opt & OPT_BACKGROUND) {
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#if BB_MMU
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@ -3613,46 +3613,65 @@
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USE_GETOPT_LONG("--start|--stop") SKIP_GETOPT_LONG("-S|-K") \
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"] ... [-- arguments...]"
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#define start_stop_daemon_full_usage "\n\n" \
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"Start and stop services\n" \
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"\nOptions:" \
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"Search for matching processes, and then\n" \
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"-S: stop all matching processes.\n" \
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"-K: start a process unless a matching process is found.\n" \
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USE_GETOPT_LONG( \
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"\n -S,--start Start" \
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"\n -K,--stop Stop" \
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"\n -a,--startas pathname Start process specified by pathname" \
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"\n -b,--background Put process into background" \
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"\n -u,--user username|uid Stop this user's processes" \
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"\n -x,--exec executable Program to either start or check" \
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"\n -n,--name process-name Stop processes with this name" \
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"\n -p,--pidfile pid-file Save or load pid using a pid-file" \
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"\n -m,--make-pidfile Create the -p file and enter pid in it" \
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"\n -q,--quiet Quiet" \
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"\nProcess matching:" \
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"\n -u,--user USERNAME|UID Match only this user's processes" \
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"\n -n,--name NAME Match processes with NAME" \
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"\n in comm field in /proc/PID/stat" \
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"\n -x,--exec EXECUTABLE Match processes with this command" \
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"\n in /proc/PID/cmdline" \
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"\n -p,--pidfile FILE Match a process with PID from the file" \
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"\n All specified conditions must match" \
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"\n-K only:" \
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"\n -x,--exec EXECUTABLE Program to run" \
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"\n -a,--startas NAME Zeroth argument" \
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"\n -b,--background Background" \
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USE_FEATURE_START_STOP_DAEMON_FANCY( \
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"\n -o,--oknodo Exit status 0 if nothing done" \
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"\n -v,--verbose Verbose" \
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"\n -N,--nicelevel N Add N to process's nice level" \
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"\n -N,--nicelevel N Change nice level" \
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) \
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"\n -s,--signal signal Signal to send (default TERM)" \
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"\n -c,--chuid user[:[grp]] Change to specified user/group" \
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"\n -c,--chuid USER[:[GRP]] Change to user/group" \
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"\n -m,--make-pidfile Write PID to the pidfile specified by -p" \
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"\n-S only:" \
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"\n -s,--signal SIG Signal to send" \
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"\n -t,--test Match only, exit with 0 if a process is found" \
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"\nOther:" \
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USE_FEATURE_START_STOP_DAEMON_FANCY( \
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"\n -o,--oknodo Exit with status 0 if nothing is done" \
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"\n -q,--quiet Quiet" \
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) \
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"\n -v,--verbose Verbose" \
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) \
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SKIP_GETOPT_LONG( \
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"\n -S Start" \
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"\n -K Stop" \
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"\n -a pathname Start process specified by pathname" \
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"\n -b Put process into background" \
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"\n -u username|uid Stop this user's processes" \
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"\n -x executable Program to either start or check" \
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"\n -n process-name Stop processes with this name" \
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"\n -p pid-file Save or load pid using a pid-file" \
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"\n -m Create the -p file and enter pid in it" \
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"\n -q Quiet" \
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"\nProcess matching:" \
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"\n -u USERNAME|UID Match only this user's processes" \
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"\n -n NAME Match processes with NAME" \
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"\n in comm field in /proc/PID/stat" \
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"\n -x EXECUTABLE Match processes with this command" \
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"\n command in /proc/PID/cmdline" \
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"\n -p FILE Match a process with PID from the file" \
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"\n All specified conditions must match" \
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"\n-K only:" \
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"\n -x EXECUTABLE Program to run" \
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"\n -a NAME Zeroth argument" \
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"\n -b Background" \
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USE_FEATURE_START_STOP_DAEMON_FANCY( \
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"\n -o Exit status 0 if nothing done" \
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"\n -v Verbose" \
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"\n -N N Add N to process's nice level" \
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"\n -N N Change nice level" \
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) \
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"\n -c USER[:[GRP]] Change to user/group" \
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"\n -m Write PID to the pidfile specified by -p" \
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"\n-S only:" \
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"\n -s SIG Signal to send" \
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"\n -t Match only, exit with 0 if a process is found" \
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"\nOther:" \
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USE_FEATURE_START_STOP_DAEMON_FANCY( \
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"\n -o Exit with status 0 if nothing is done" \
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"\n -q Quiet" \
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) \
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"\n -v Verbose" \
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) \
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"\n -s signal Signal to send (default TERM)" \
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"\n -c user[:[grp]] Change to specified user/group" \
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)
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#define stat_trivial_usage \
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"[OPTION] FILE..."
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