* Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
* Adapted for busybox David Kimdon <dwhedon@gordian.com>
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-/* NB: we have a problem here with /proc/NN/exe usage, similar to
- * one fixed in killall/pidof */
+/*
+This is how it is supposed to work:
+
+start-stop-daemon [OPTIONS] [--start|--stop] [[--] arguments...]
+
+One (only) of these must be given:
+ -S,--start Start
+ -K,--stop Stop
+
+Search for matching processes.
+If --stop is given, stop all matching processes (by sending a signal).
+If --start is given, start a new process unless a matching process was found.
+
+Options controlling process matching
+(if multiple conditions are specified, all must match):
+ -u,--user USERNAME|UID Only consider this user's processes
+ -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 that were started with this
+ command in /proc/$PID/exe and /proc/$PID/cmdline
+ (/proc/$PID/cmdline is a bbox extension)
+ Unlike -n, we match against the full path:
+ "ntpd" != "./ntpd" != "/path/to/ntpd"
+ -p,--pidfile PID_FILE Look for processes with PID from this file
+
+Options which are valid for --start only:
+ -x,--exec EXECUTABLE Program to run (1st arg of execvp). Mandatory.
+ -a,--startas NAME argv[0] (defaults to EXECUTABLE)
+ -b,--background Put process into background
+ -N,--nicelevel N Add N to process' nice level
+ -c,--chuid USER[:[GRP]] Change to specified user [and group]
+ -m,--make-pidfile Write PID to the pidfile
+ (both -m and -p must be given!)
+
+Options which are valid for --stop only:
+ -s,--signal SIG Signal to send (default:TERM)
+ -t,--test Exit with status 0 if process is found
+ (we don't actually start or stop daemons)
+
+Misc options:
+ -o,--oknodo Exit with status 0 if nothing is done
+ -q,--quiet Quiet
+ -v,--verbose Verbose
+*/
+//config:config START_STOP_DAEMON
+//config: bool "start-stop-daemon"
+//config: default y
+//config: help
+//config: start-stop-daemon is used to control the creation and
+//config: termination of system-level processes, usually the ones
+//config: started during the startup of the system.
+//config:
+//config:config FEATURE_START_STOP_DAEMON_LONG_OPTIONS
+//config: bool "Enable long options"
+//config: default y
+//config: depends on START_STOP_DAEMON && LONG_OPTS
+//config:
+//config:config FEATURE_START_STOP_DAEMON_FANCY
+//config: bool "Support additional arguments"
+//config: default y
+//config: depends on START_STOP_DAEMON
+//config: help
+//config: -o|--oknodo ignored since we exit with 0 anyway
+//config: -v|--verbose
+//config: -N|--nicelevel N
+
+//applet:IF_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, BB_DIR_SBIN, BB_SUID_DROP, start_stop_daemon))
+
+//kbuild:lib-$(CONFIG_START_STOP_DAEMON) += start_stop_daemon.o
+
+//usage:#define start_stop_daemon_trivial_usage
+//usage: "[OPTIONS] [-S|-K] ... [-- ARGS...]"
+//usage:#define start_stop_daemon_full_usage "\n\n"
+//usage: "Search for matching processes, and then\n"
+//usage: "-K: stop all matching processes.\n"
+//usage: "-S: start a process unless a matching process is found.\n"
+//usage: IF_FEATURE_START_STOP_DAEMON_LONG_OPTIONS(
+//usage: "\nProcess matching:"
+//usage: "\n -u,--user USERNAME|UID Match only this user's processes"
+//usage: "\n -n,--name NAME Match processes with NAME"
+//usage: "\n in comm field in /proc/PID/stat"
+//usage: "\n -x,--exec EXECUTABLE Match processes with this command"
+//usage: "\n in /proc/PID/{exe,cmdline}"
+//usage: "\n -p,--pidfile FILE Match a process with PID from the file"
+//usage: "\n All specified conditions must match"
+//usage: "\n-S only:"
+//usage: "\n -x,--exec EXECUTABLE Program to run"
+//usage: "\n -a,--startas NAME Zeroth argument"
+//usage: "\n -b,--background Background"
+//usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
+//usage: "\n -N,--nicelevel N Change nice level"
+//usage: )
+//usage: "\n -c,--chuid USER[:[GRP]] Change to user/group"
+//usage: "\n -m,--make-pidfile Write PID to the pidfile specified by -p"
+//usage: "\n-K only:"
+//usage: "\n -s,--signal SIG Signal to send"
+//usage: "\n -t,--test Match only, exit with 0 if a process is found"
+//usage: "\nOther:"
+//usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
+//usage: "\n -o,--oknodo Exit with status 0 if nothing is done"
+//usage: "\n -v,--verbose Verbose"
+//usage: )
+//usage: "\n -q,--quiet Quiet"
+//usage: )
+//usage: IF_NOT_FEATURE_START_STOP_DAEMON_LONG_OPTIONS(
+//usage: "\nProcess matching:"
+//usage: "\n -u USERNAME|UID Match only this user's processes"
+//usage: "\n -n NAME Match processes with NAME"
+//usage: "\n in comm field in /proc/PID/stat"
+//usage: "\n -x EXECUTABLE Match processes with this command"
+//usage: "\n command in /proc/PID/cmdline"
+//usage: "\n -p FILE Match a process with PID from the file"
+//usage: "\n All specified conditions must match"
+//usage: "\n-S only:"
+//usage: "\n -x EXECUTABLE Program to run"
+//usage: "\n -a NAME Zeroth argument"
+//usage: "\n -b Background"
+//usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
+//usage: "\n -N N Change nice level"
+//usage: )
+//usage: "\n -c USER[:[GRP]] Change to user/group"
+//usage: "\n -m Write PID to the pidfile specified by -p"
+//usage: "\n-K only:"
+//usage: "\n -s SIG Signal to send"
+//usage: "\n -t Match only, exit with 0 if a process is found"
+//usage: "\nOther:"
+//usage: IF_FEATURE_START_STOP_DAEMON_FANCY(
+//usage: "\n -o Exit with status 0 if nothing is done"
+//usage: "\n -v Verbose"
+//usage: )
+//usage: "\n -q Quiet"
+//usage: )
-#include <getopt.h>
#include <sys/resource.h>
/* Override ENABLE_FEATURE_PIDFILE */
#define WANT_PIDFILE 1
#include "libbb.h"
+#include "common_bufsiz.h"
struct pid_list {
struct pid_list *next;
pid_t pid;
};
+enum {
+ CTX_STOP = (1 << 0),
+ CTX_START = (1 << 1),
+ OPT_BACKGROUND = (1 << 2), // -b
+ OPT_QUIET = (1 << 3), // -q
+ 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;
+ struct pid_list *found_procs;
char *userspec;
char *cmdname;
char *execname;
char *pidfile;
+ char *execname_cmpbuf;
+ unsigned execname_sizeof;
int user_id;
- smallint quiet;
smallint signal_nr;
-};
-#define G (*(struct globals*)&bb_common_bufsiz1)
-#define found (G.found )
+} FIX_ALIASING;
+#define G (*(struct globals*)bb_common_bufsiz1)
#define userspec (G.userspec )
#define cmdname (G.cmdname )
#define execname (G.execname )
#define pidfile (G.pidfile )
#define user_id (G.user_id )
-#define quiet (G.quiet )
#define signal_nr (G.signal_nr )
-#define INIT_G() \
- do { \
- user_id = -1; \
- signal_nr = 15; \
- } while (0)
+#define INIT_G() do { \
+ setup_common_bufsiz(); \
+ 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/%u/exe") + sizeof(int)*3];
+ sprintf(buf, "/proc/%u/exe", (unsigned)pid);
+ if (stat(buf, &st) < 0)
+ return 0;
+ if (st.st_dev == execstat.st_dev
+ && st.st_ino == execstat.st_ino)
+ return 1;
+ return 0;
+}
+#endif
-static int pid_is_exec(pid_t pid, const char *name)
+static int pid_is_exec(pid_t pid)
{
- char buf[sizeof("/proc//exe") + sizeof(int)*3];
- char *execbuf;
- int n;
-
- sprintf(buf, "/proc/%u/exe", pid);
- n = strlen(name) + 1;
- execbuf = xzalloc(n + 1);
- readlink(buf, execbuf, n);
- /* if readlink fails because link target is longer than strlen(name),
- * execbuf still contains "", and strcmp will return !0. */
- n = strcmp(execbuf, name);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(execbuf);
- return !n; /* nonzero (true) if execbuf == name */
+ ssize_t bytes;
+ char buf[sizeof("/proc/%u/cmdline") + sizeof(int)*3];
+ char *procname, *exelink;
+ int match;
+
+ procname = buf + sprintf(buf, "/proc/%u/exe", (unsigned)pid) - 3;
+
+ exelink = xmalloc_readlink(buf);
+ match = (exelink && strcmp(execname, exelink) == 0);
+ free(exelink);
+ if (match)
+ return match;
+
+ strcpy(procname, "cmdline");
+ bytes = open_read_close(buf, G.execname_cmpbuf, G.execname_sizeof);
+ if (bytes > 0) {
+ G.execname_cmpbuf[bytes] = '\0';
+ return strcmp(execname, G.execname_cmpbuf) == 0;
+ }
+ return 0;
}
-static int pid_is_user(int pid, int uid)
+static int pid_is_name(pid_t pid)
{
- struct stat sb;
- char buf[sizeof("/proc/") + sizeof(int)*3];
+ /* /proc/PID/stat is "PID (comm_15_bytes_max) ..." */
+ char buf[32]; /* should be enough */
+ char *p, *pe;
- sprintf(buf, "/proc/%u", pid);
- if (stat(buf, &sb) != 0)
+ 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 */
+ p = strchr(buf, '(');
+ if (!p)
+ return 0;
+ pe = strrchr(++p, ')');
+ if (!pe)
+ return 0;
+ *pe = '\0';
+ /* 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 (sb.st_uid == uid);
+ return strcmp(p, cmdname) == 0;
}
-static int pid_is_cmd(pid_t pid, const char *name)
+static int pid_is_user(int pid)
{
- char fname[sizeof("/proc//stat") + sizeof(int)*3];
- char *buf;
- int r = 0;
-
- sprintf(fname, "/proc/%u/stat", pid);
- buf = xmalloc_open_read_close(fname, NULL);
- if (buf) {
- char *p = strchr(buf, '(');
- if (p) {
- char *pe = strrchr(++p, ')');
- if (pe) {
- *pe = '\0';
- r = !strcmp(p, name);
- }
- }
- free(buf);
- }
- return r;
+ 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)
{
struct pid_list *p;
- if (execname && !pid_is_exec(pid, execname)) {
+ if (execname && !pid_is_exec(pid)) {
return;
}
- if (userspec && !pid_is_user(pid, user_id)) {
+ if (cmdname && !pid_is_name(pid)) {
return;
}
- if (cmdname && !pid_is_cmd(pid, cmdname)) {
+ if (userspec && !pid_is_user(pid)) {
return;
}
p = xmalloc(sizeof(*p));
- p->next = found;
+ p->next = G.found_procs;
p->pid = pid;
- found = p;
+ G.found_procs = p;
}
static void do_pidfile(void)
FILE *f;
unsigned pid;
- f = fopen(pidfile, "r");
+ f = fopen_for_read(pidfile);
if (f) {
if (fscanf(f, "%u", &pid) == 1)
check(pid);
procdir = xopendir("/proc");
pid = 0;
- while ((entry = readdir(procdir)) != NULL) {
+ while (1) {
+ errno = 0; /* clear any previous error */
+ entry = readdir(procdir);
+// 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 */
+ break;
pid = bb_strtou(entry->d_name, NULL, 10);
- if (errno)
+ if (errno) /* NaN */
continue;
check(pid);
}
struct pid_list *p;
int killed = 0;
- do_procinit();
-
if (cmdname) {
if (ENABLE_FEATURE_CLEAN_UP) what = xstrdup(cmdname);
if (!ENABLE_FEATURE_CLEAN_UP) what = cmdname;
} 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)
+ if (!G.found_procs) {
+ if (!QUIET)
printf("no %s found; none killed\n", what);
killed = -1;
goto ret;
}
- for (p = found; p; p = p->next) {
- if (kill(p->pid, signal_nr) == 0) {
- p->pid = - p->pid;
+ for (p = G.found_procs; p; p = p->next) {
+ if (kill(p->pid, TEST ? 0 : signal_nr) == 0) {
killed++;
} else {
- bb_perror_msg("warning: killing process %u", p->pid);
+ bb_perror_msg("warning: killing process %u", (unsigned)p->pid);
+ p->pid = 0;
+ if (TEST) {
+ /* Example: -K --test --pidfile PIDFILE detected
+ * that PIDFILE's pid doesn't exist */
+ killed = -1;
+ goto ret;
+ }
}
}
- if (!quiet && killed) {
+ if (!QUIET && killed) {
printf("stopped %s (pid", what);
- for (p = found; p; p = p->next)
- if (p->pid < 0)
- printf(" %u", - p->pid);
+ for (p = G.found_procs; p; p = p->next)
+ 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"
;
#endif
-enum {
- CTX_STOP = 0x1,
- CTX_START = 0x2,
- OPT_BACKGROUND = 0x4, // -b
- OPT_QUIET = 0x8, // -q
- OPT_MAKEPID = 0x10, // -m
- OPT_a = 0x20, // -a
- OPT_n = 0x40, // -n
- OPT_s = 0x80, // -s
- OPT_u = 0x100, // -u
- OPT_c = 0x200, // -c
- OPT_x = 0x400, // -x
- OPT_p = 0x800, // -p
- OPT_OKNODO = 0x1000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -o
- OPT_VERBOSE = 0x2000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -v
- OPT_NICELEVEL = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
-};
-
int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int start_stop_daemon_main(int argc, char **argv)
+int start_stop_daemon_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opt;
char *signame;
char *startas;
char *chuid;
+#ifdef OLDER_VERSION_OF_X
+ struct stat execstat;
+#endif
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
// char *retry_arg = NULL;
// int retries = -1;
applet_long_options = start_stop_daemon_longopts;
#endif
- /* Check required one context option was given */
- opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
- opt = getopt32(argv, "KSbqma:n:s:u:c:x:p:"
- USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
-// USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
+ /* -K or -S is required; they are mutually exclusive */
+ /* -p is required if -m is given */
+ /* -xpun (at least one) is required if -K is given */
+ /* -xa (at least one) is required if -S is given */
+ /* -q turns off -v */
+ opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa"
+ IF_FEATURE_START_STOP_DAEMON_FANCY("q-v");
+ opt = getopt32(argv, "KSbqtma:n:s:u:c:x:p:"
+ IF_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
&startas, &cmdname, &signame, &userspec, &chuid, &execname, &pidfile
- USE_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
-// USE_FEATURE_START_STOP_DAEMON_FANCY(,&retry_arg)
+ IF_FEATURE_START_STOP_DAEMON_FANCY(,&opt_N)
+ /* We accept and ignore -R <param> / --retry <param> */
+ IF_FEATURE_START_STOP_DAEMON_FANCY(,NULL)
);
- quiet = (opt & OPT_QUIET) && !(opt & OPT_VERBOSE);
-
if (opt & OPT_s) {
signal_nr = get_signum(signame);
if (signal_nr < 0) bb_show_usage();
if (!(opt & OPT_a))
startas = execname;
+ if (!execname) /* in case -a is given and -x is not */
+ execname = startas;
+ if (execname) {
+ G.execname_sizeof = strlen(execname) + 1;
+ G.execname_cmpbuf = xmalloc(G.execname_sizeof + 1);
+ }
-// USE_FEATURE_START_STOP_DAEMON_FANCY(
+// IF_FEATURE_START_STOP_DAEMON_FANCY(
// if (retry_arg)
-// retries = xatoi_u(retry_arg);
+// retries = xatoi_positive(retry_arg);
// )
- argc -= optind;
+ //argc -= optind;
argv += optind;
if (userspec) {
if (errno)
user_id = xuname2uid(userspec);
}
+ /* Both start and stop need to know current processes */
+ do_procinit();
if (opt & CTX_STOP) {
int i = do_stop();
return (opt & OPT_OKNODO) ? 0 : (i <= 0);
}
- do_procinit();
-
- if (found) {
- if (!quiet)
- printf("%s already running\n%d\n", execname, found->pid);
+ if (G.found_procs) {
+ if (!QUIET)
+ printf("%s is already running\n%u\n", execname, (unsigned)G.found_procs->pid);
return !(opt & OPT_OKNODO);
}
+
+#ifdef OLDER_VERSION_OF_X
+ if (execname)
+ xstat(execname, &execstat);
+#endif
+
*--argv = startas;
if (opt & OPT_BACKGROUND) {
#if BB_MMU
- bb_daemonize(0);
+ bb_daemonize(DAEMON_DEVNULL_STDIO + DAEMON_CLOSE_EXTRA_FDS + DAEMON_DOUBLE_FORK);
+ /* DAEMON_DEVNULL_STDIO is superfluous -
+ * it's always done by bb_daemonize() */
#else
- pid_t pid = vfork();
- if (pid < 0) /* error */
- bb_perror_msg_and_die("vfork");
+ pid_t pid = xvfork();
if (pid != 0) {
/* parent */
/* why _exit? the child may have changed the stack,
* so "return 0" may do bad things */
- _exit(0);
+ _exit(EXIT_SUCCESS);
}
- /* child */
+ /* Child */
setsid(); /* detach from controlling tty */
/* Redirect stdio to /dev/null, close extra FDs.
* We do not actually daemonize because of DAEMON_ONLY_SANITIZE */
- bb_daemonize_or_rexec(
- DAEMON_DEVNULL_STDIO
+ bb_daemonize_or_rexec(DAEMON_DEVNULL_STDIO
+ DAEMON_CLOSE_EXTRA_FDS
+ DAEMON_ONLY_SANITIZE,
NULL /* argv, unused */ );
#endif
}
if (opt & OPT_MAKEPID) {
- /* user wants _us_ to make the pidfile */
+ /* User wants _us_ to make the pidfile */
write_pidfile(pidfile);
}
if (opt & OPT_c) {
struct bb_uidgid_t ugid;
parse_chown_usergroup_or_die(&ugid, chuid);
- if (ugid.gid != (gid_t) -1) xsetgid(ugid.gid);
- if (ugid.uid != (uid_t) -1) xsetuid(ugid.uid);
+ if (ugid.uid != (uid_t) -1L) {
+ struct passwd *pw = xgetpwuid(ugid.uid);
+ if (ugid.gid != (gid_t) -1L)
+ pw->pw_gid = ugid.gid;
+ /* initgroups, setgid, setuid: */
+ change_identity(pw);
+ } else if (ugid.gid != (gid_t) -1L) {
+ xsetgid(ugid.gid);
+ setgroups(1, &ugid.gid);
+ }
}
#if ENABLE_FEATURE_START_STOP_DAEMON_FANCY
if (opt & OPT_NICELEVEL) {
}
}
#endif
- execv(startas, argv);
- bb_perror_msg_and_die("cannot start %s", startas);
+ execvp(startas, argv);
+ bb_perror_msg_and_die("can't execute '%s'", startas);
}
projects / oweals / busybox.git / blobdiff