Options controlling process matching:
-u,--user USERNAME|UID Only consider this user's processes
- -n,--name PROCESS_NAME Look for processes with matching argv[0]
- or /proc/$PID/exe or /proc/$PID/stat (comm field).
+ -n,--name PROCESS_NAME Look for processes by matching PROCESS_NAME
+ with comm field in /proc/$PID/stat.
Only basename is compared:
"ntpd" == "./ntpd" == "/path/to/ntpd".
[TODO: can PROCESS_NAME be a full pathname? Should we require full match then
with /proc/$PID/exe or argv[0] (comm can't be matched, it never contains path)]
- -x,--exec EXECUTABLE Look for processes with matching /proc/$PID/exe.
- Match is performed using device+inode.
+ -x,--exec EXECUTABLE Look for processes that were started with this
+ command in /proc/$PID/cmdline.
+ Unlike -n, we match against the full path:
+ "ntpd" != "./ntpd" != "/path/to/ntpd"
-p,--pidfile PID_FILE Look for processes with PID from this file
+If multiple conditions are specified, all must match.
Options which are valid for --start only:
-x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
-c,--chuid USER[:[GRP]] Change to specified user [and group]
-m,--make-pidfile Write PID to the pidfile
(both -m and -p must be given!)
-Misc options:
+
+Options which are valid for --stop only:
-s,--signal SIG Signal to send (default:TERM)
+ -t,--test Exit with status 0 if process is found
+ (we don't actually start or stop daemons)
+
+Misc options:
-o,--oknodo Exit with status 0 if nothing is done
-q,--quiet Quiet
-v,--verbose Verbose
CTX_START = (1 << 1),
OPT_BACKGROUND = (1 << 2), // -b
OPT_QUIET = (1 << 3), // -q
- OPT_MAKEPID = (1 << 4), // -m
- OPT_a = (1 << 5), // -a
- OPT_n = (1 << 6), // -n
- OPT_s = (1 << 7), // -s
- OPT_u = (1 << 8), // -u
- OPT_c = (1 << 9), // -c
- OPT_x = (1 << 10), // -x
- OPT_p = (1 << 11), // -p
- OPT_OKNODO = (1 << 12) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
- OPT_VERBOSE = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
- OPT_NICELEVEL = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
+ OPT_TEST = (1 << 4), // -t
+ OPT_MAKEPID = (1 << 5), // -m
+ OPT_a = (1 << 6), // -a
+ OPT_n = (1 << 7), // -n
+ OPT_s = (1 << 8), // -s
+ OPT_u = (1 << 9), // -u
+ OPT_c = (1 << 10), // -c
+ OPT_x = (1 << 11), // -x
+ OPT_p = (1 << 12), // -p
+ OPT_OKNODO = (1 << 13) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
+ OPT_VERBOSE = (1 << 14) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
+ OPT_NICELEVEL = (1 << 15) * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
};
#define QUIET (option_mask32 & OPT_QUIET)
+#define TEST (option_mask32 & OPT_TEST)
struct globals {
struct pid_list *found;
char *pidfile;
int user_id;
smallint signal_nr;
- struct stat execstat;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define found (G.found )
#define pidfile (G.pidfile )
#define user_id (G.user_id )
#define signal_nr (G.signal_nr )
-#define execstat (G.execstat )
#define INIT_G() \
do { \
user_id = -1; \
signal_nr = 15; \
} while (0)
-
+#ifdef OLDER_VERSION_OF_X
+/* -x,--exec EXECUTABLE
+ * Look for processes with matching /proc/$PID/exe.
+ * Match is performed using device+inode.
+ */
static int pid_is_exec(pid_t pid)
{
struct stat st;
char buf[sizeof("/proc//exe") + sizeof(int)*3];
- sprintf(buf, "/proc/%u/exe", pid);
+ sprintf(buf, "/proc/%u/exe", (unsigned)pid);
if (stat(buf, &st) < 0)
return 0;
if (st.st_dev == execstat.st_dev
return 1;
return 0;
}
+#endif
-static int pid_is_user(int pid)
+static int pid_is_exec(pid_t pid)
{
- struct stat sb;
- char buf[sizeof("/proc/") + sizeof(int)*3];
-
- sprintf(buf, "/proc/%u", pid);
- if (stat(buf, &sb) != 0)
- return 0;
- return (sb.st_uid == (uid_t)user_id);
+ ssize_t bytes;
+ char buf[PATH_MAX];
+
+ sprintf(buf, "/proc/%u/cmdline", (unsigned)pid);
+ bytes = open_read_close(buf, buf, sizeof(buf) - 1);
+ if (bytes > 0) {
+ buf[bytes] = '\0';
+ return strcmp(buf, execname) == 0;
+ }
+ return 0;
}
-static int pid_is_cmd(pid_t pid)
+static int pid_is_name(pid_t pid)
{
- char buf[256]; /* is it big enough? */
+ /* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
+ char buf[32]; /* should be enough */
char *p, *pe;
- sprintf(buf, "/proc/%u/stat", pid);
+ sprintf(buf, "/proc/%u/stat", (unsigned)pid);
if (open_read_close(buf, buf, sizeof(buf) - 1) < 0)
return 0;
buf[sizeof(buf) - 1] = '\0'; /* paranoia */
if (!pe)
return 0;
*pe = '\0';
- return !strcmp(p, cmdname);
+ /* we require comm to match and to not be truncated */
+ /* in Linux, if comm is 15 chars, it may be a truncated
+ * name, so we don't allow that to match */
+ if (strlen(p) >= COMM_LEN - 1) /* COMM_LEN is 16 */
+ return 0;
+ return strcmp(p, cmdname) == 0;
+}
+
+static int pid_is_user(int pid)
+{
+ struct stat sb;
+ char buf[sizeof("/proc/") + sizeof(int)*3];
+
+ sprintf(buf, "/proc/%u", (unsigned)pid);
+ if (stat(buf, &sb) != 0)
+ return 0;
+ return (sb.st_uid == (uid_t)user_id);
}
static void check(int pid)
if (execname && !pid_is_exec(pid)) {
return;
}
- if (userspec && !pid_is_user(pid)) {
+ if (cmdname && !pid_is_name(pid)) {
return;
}
- if (cmdname && !pid_is_cmd(pid)) {
+ if (userspec && !pid_is_user(pid)) {
return;
}
p = xmalloc(sizeof(*p));
procdir = xopendir("/proc");
pid = 0;
- while(1) {
+ while (1) {
errno = 0; /* clear any previous error */
entry = readdir(procdir);
-// TODO: check for exact errno(s) which mean that we got stale entry
+// TODO: this check is too generic, it's better
+// to check for exact errno(s) which mean that we got stale entry
if (errno) /* Stale entry, process has died after opendir */
continue;
if (!entry) /* EOF, no more entries */
} else if (execname) {
if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(execname);
if (!ENABLE_FEATURE_CLEAN_UP) what = execname;
- } else if (pidfile)
+ } else if (pidfile) {
what = xasprintf("process in pidfile '%s'", pidfile);
- else if (userspec)
+ } else if (userspec) {
what = xasprintf("process(es) owned by '%s'", userspec);
- else
+ } else {
bb_error_msg_and_die("internal error, please report");
+ }
if (!found) {
if (!QUIET)
goto ret;
}
for (p = found; p; p = p->next) {
- if (kill(p->pid, signal_nr) == 0) {
- p->pid = - p->pid;
+ if (TEST || kill(p->pid, signal_nr) == 0) {
killed++;
} else {
- bb_perror_msg("warning: killing process %u", p->pid);
+ p->pid = 0;
+ bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
}
}
if (!QUIET && killed) {
printf("stopped %s (pid", what);
for (p = found; p; p = p->next)
- if (p->pid < 0)
- printf(" %u", - p->pid);
+ if (p->pid)
+ printf(" %u", (unsigned)p->pid);
puts(")");
}
ret:
"start\0" No_argument "S"
"background\0" No_argument "b"
"quiet\0" No_argument "q"
+ "test\0" No_argument "t"
"make-pidfile\0" No_argument "m"
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
"oknodo\0" No_argument "o"
char *signame;
char *startas;
char *chuid;
+ struct stat execstat;
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
// char *retry_arg = NULL;
// int retries = -1;
/* -q turns off -v */
opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
USE_FEATURE_START_STOP_DAEMON_FANCY("q-v");
- opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
+ opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
if (errno)
user_id = xuname2uid(userspec);
}
- if (execname)
- xstat(execname, &execstat);
-
do_procinit(); /* Both start and stop needs to know current processes */
if (opt & CTX_STOP) {
printf("%s already running\n%d\n", execname, found->pid);
return !(opt & OPT_OKNODO);
}
+
+ if (execname)
+ xstat(execname, &execstat);
+
*--argv = startas;
if (opt & OPT_BACKGROUND) {
#if BB_MMU
USE_GETOPT_LONG("--start|--stop") SKIP_GETOPT_LONG("-S|-K") \
"] ... [-- arguments...]"
#define start_stop_daemon_full_usage "\n\n" \
- "Start and stop services\n" \
- "\nOptions:" \
+ "Search for matching processes, and then\n" \
+ "-S: stop all matching processes.\n" \
+ "-K: start a process unless a matching process is found.\n" \
USE_GETOPT_LONG( \
- "\n -S,--start Start" \
- "\n -K,--stop Stop" \
- "\n -a,--startas pathname Start process specified by pathname" \
- "\n -b,--background Put process into background" \
- "\n -u,--user username|uid Stop this user's processes" \
- "\n -x,--exec executable Program to either start or check" \
- "\n -n,--name process-name Stop processes with this name" \
- "\n -p,--pidfile pid-file Save or load pid using a pid-file" \
- "\n -m,--make-pidfile Create the -p file and enter pid in it" \
- "\n -q,--quiet Quiet" \
+ "\nProcess matching:" \
+ "\n -u,--user USERNAME|UID Match only this user's processes" \
+ "\n -n,--name NAME Match processes with NAME" \
+ "\n in comm field in /proc/PID/stat" \
+ "\n -x,--exec EXECUTABLE Match processes with this command" \
+ "\n in /proc/PID/cmdline" \
+ "\n -p,--pidfile FILE Match a process with PID from the file" \
+ "\n All specified conditions must match" \
+ "\n-K only:" \
+ "\n -x,--exec EXECUTABLE Program to run" \
+ "\n -a,--startas NAME Zeroth argument" \
+ "\n -b,--background Background" \
USE_FEATURE_START_STOP_DAEMON_FANCY( \
- "\n -o,--oknodo Exit status 0 if nothing done" \
- "\n -v,--verbose Verbose" \
- "\n -N,--nicelevel N Add N to process's nice level" \
+ "\n -N,--nicelevel N Change nice level" \
) \
- "\n -s,--signal signal Signal to send (default TERM)" \
- "\n -c,--chuid user[:[grp]] Change to specified user/group" \
+ "\n -c,--chuid USER[:[GRP]] Change to user/group" \
+ "\n -m,--make-pidfile Write PID to the pidfile specified by -p" \
+ "\n-S only:" \
+ "\n -s,--signal SIG Signal to send" \
+ "\n -t,--test Match only, exit with 0 if a process is found" \
+ "\nOther:" \
+ USE_FEATURE_START_STOP_DAEMON_FANCY( \
+ "\n -o,--oknodo Exit with status 0 if nothing is done" \
+ "\n -q,--quiet Quiet" \
+ ) \
+ "\n -v,--verbose Verbose" \
) \
SKIP_GETOPT_LONG( \
- "\n -S Start" \
- "\n -K Stop" \
- "\n -a pathname Start process specified by pathname" \
- "\n -b Put process into background" \
- "\n -u username|uid Stop this user's processes" \
- "\n -x executable Program to either start or check" \
- "\n -n process-name Stop processes with this name" \
- "\n -p pid-file Save or load pid using a pid-file" \
- "\n -m Create the -p file and enter pid in it" \
- "\n -q Quiet" \
+ "\nProcess matching:" \
+ "\n -u USERNAME|UID Match only this user's processes" \
+ "\n -n NAME Match processes with NAME" \
+ "\n in comm field in /proc/PID/stat" \
+ "\n -x EXECUTABLE Match processes with this command" \
+ "\n command in /proc/PID/cmdline" \
+ "\n -p FILE Match a process with PID from the file" \
+ "\n All specified conditions must match" \
+ "\n-K only:" \
+ "\n -x EXECUTABLE Program to run" \
+ "\n -a NAME Zeroth argument" \
+ "\n -b Background" \
+ USE_FEATURE_START_STOP_DAEMON_FANCY( \
+ "\n -N N Change nice level" \
+ ) \
+ "\n -c USER[:[GRP]] Change to user/group" \
+ "\n -m Write PID to the pidfile specified by -p" \
+ "\n-S only:" \
+ "\n -s SIG Signal to send" \
+ "\n -t Match only, exit with 0 if a process is found" \
+ "\nOther:" \
USE_FEATURE_START_STOP_DAEMON_FANCY( \
- "\n -o Exit status 0 if nothing done" \
+ "\n -o Exit with status 0 if nothing is done" \
+ "\n -q Quiet" \
+ ) \
"\n -v Verbose" \
- "\n -N N Add N to process's nice level" \
) \
- "\n -s signal Signal to send (default TERM)" \
- "\n -c user[:[grp]] Change to specified user/group" \
- )
#define stat_trivial_usage \
"[OPTION] FILE..."
projects / oweals / busybox.git / commitdiff