2 * A rewrite of the original Debian's start-stop-daemon Perl script
3 * in C (faster - it is executed many times during system startup).
5 * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>,
21 #define VERSION "version 0.3, 1996-06-05"
23 static int testmode = 0;
24 static int quietmode = 0;
25 static int exitnodo = 1;
28 static int signal_nr = 15;
29 static int user_id = -1;
30 static const char *userspec = NULL;
31 static const char *cmdname = NULL;
32 static char *execname = NULL;
33 static char *startas = NULL;
34 static const char *pidfile = NULL;
35 static const char *progname = "";
37 static struct stat exec_stat;
40 struct pid_list *next;
44 static struct pid_list *found = NULL;
45 static struct pid_list *killed = NULL;
47 static void *xmalloc(int size);
48 static void push(struct pid_list **list, int pid);
49 static void do_help(void);
50 static void parse_options(int argc, char * const *argv);
51 static int pid_is_exec(int pid, const struct stat *esb);
52 static int pid_is_user(int pid, int uid);
53 static int pid_is_cmd(int pid, const char *name);
54 static void check(int pid);
55 static void do_pidfile(const char *name);
56 static void do_procfs(void);
57 static void do_stop(void);
60 static void fatal(const char *format, ...)
61 __attribute__((noreturn, format(printf, 1, 2)));
62 static void badusage(const char *msg)
63 __attribute__((noreturn));
65 static void fatal(const char *format, ...);
66 static void badusage(const char *msg);
70 fatal(const char *format, ...)
74 fprintf(stderr, "%s: ", progname);
75 va_start(arglist, format);
76 vfprintf(stderr, format, arglist);
91 fatal("malloc(%d) failed", size);
96 push(struct pid_list **list, int pid)
100 p = xmalloc(sizeof(*p));
111 start-stop-daemon for Debian Linux - small and fast C version written by\n\
112 Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, public domain.\n"
116 start-stop-daemon -S|--start options ... -- arguments ...\n\
117 start-stop-daemon -K|--stop options ...\n\
118 start-stop-daemon -H|--help\n\
119 start-stop-daemon -V|--version\n\
121 Options (at least one of --exec|--pidfile|--user is required):
122 -x|--exec <executable> program to start/check if it is running\n\
123 -p|--pidfile <pid-file> pid file to check\n\
124 -u|--user <username>|<uid> stop this user's processes\n\
125 -n|--name <process-name> stop processes with this name\n\
126 -s|--signal <signal> signal to send (default 15)\n\
127 -a|--startas <pathname> program to start (default <executable>)\n\
128 -t|--test test mode, don't do anything\n\
129 -o|--oknodo exit status 0 (not 1) if nothing done\n\
130 -q|--quiet | -v, --verbose\n\
132 Exit status: 0 = done 1 = nothing done (=> 0 if --oknodo) 2 = trouble\n");
137 badusage(const char *msg)
140 fprintf(stderr, "%s: %s\n", progname, msg);
141 fprintf(stderr, "Try `%s --help' for more information.\n", progname);
147 parse_options(int argc, char * const *argv)
149 static struct option longopts[] = {
150 { "help", 0, NULL, 'H'},
151 { "stop", 0, NULL, 'K'},
152 { "start", 0, NULL, 'S'},
153 { "version", 0, NULL, 'V'},
154 { "startas", 1, NULL, 'a'},
155 { "name", 1, NULL, 'n'},
156 { "oknodo", 0, NULL, 'o'},
157 { "pidfile", 1, NULL, 'p'},
158 { "quiet", 0, NULL, 'q'},
159 { "signal", 1, NULL, 's'},
160 { "test", 0, NULL, 't'},
161 { "user", 1, NULL, 'u'},
162 { "verbose", 0, NULL, 'v'},
163 { "exec", 1, NULL, 'x'},
169 c = getopt_long(argc, argv, "HKSVa:n:op:qs:tu:vx:",
170 longopts, (int *) 0);
174 case 'H': /* --help */
177 case 'K': /* --stop */
180 case 'S': /* --start */
183 case 'V': /* --version */
184 printf("start-stop-daemon " VERSION "\n");
186 case 'a': /* --startas <pathname> */
189 case 'n': /* --name <process-name> */
192 case 'o': /* --oknodo */
195 case 'p': /* --pidfile <pid-file> */
198 case 'q': /* --quiet */
201 case 's': /* --signal <signal> */
202 if (sscanf(optarg, "%d", &signal_nr) != 1)
203 badusage("--signal takes a numeric argument");
205 case 't': /* --test */
208 case 'u': /* --user <username>|<uid> */
211 case 'v': /* --verbose */
214 case 'x': /* --exec <executable> */
218 badusage(""); /* message printed by getopt */
223 badusage("need one of --start or --stop");
225 if (!execname && !pidfile && !userspec)
226 badusage("need at least one of --exec, --pidfile or --user");
231 if (start && !startas)
232 badusage("--start needs --exec or --startas");
237 pid_is_exec(int pid, const struct stat *esb)
242 sprintf(buf, "/proc/%d/exe", pid);
243 if (stat(buf, &sb) != 0)
245 return (sb.st_dev == esb->st_dev && sb.st_ino == esb->st_ino);
250 pid_is_user(int pid, int uid)
255 sprintf(buf, "/proc/%d", pid);
256 if (stat(buf, &sb) != 0)
258 return (sb.st_uid == uid);
263 pid_is_cmd(int pid, const char *name)
269 sprintf(buf, "/proc/%d/stat", pid);
273 while ((c = getc(f)) != EOF && c != '(')
279 /* this hopefully handles command names containing ')' */
280 while ((c = getc(f)) != EOF && c == *name)
283 return (c == ')' && *name == '\0');
290 if (execname && !pid_is_exec(pid, &exec_stat))
292 if (userspec && !pid_is_user(pid, user_id))
294 if (cmdname && !pid_is_cmd(pid, cmdname))
301 do_pidfile(const char *name)
306 f = fopen(name, "r");
308 if (fscanf(f, "%d", &pid) == 1)
319 struct dirent *entry;
322 procdir = opendir("/proc");
324 fatal("opendir /proc: %s", strerror(errno));
327 while ((entry = readdir(procdir)) != NULL) {
328 if (sscanf(entry->d_name, "%d", &pid) != 1)
335 fatal("nothing in /proc - not mounted?");
346 strcpy(what, cmdname);
348 strcpy(what, execname);
350 sprintf(what, "process in pidfile `%s'", pidfile);
352 sprintf(what, "process(es) owned by `%s'", userspec);
354 fatal("internal error, please report");
358 printf("no %s found; none killed.\n", what);
361 for (p = found; p; p = p->next) {
363 printf("would send signal %d to %d.\n",
365 else if (kill(p->pid, signal_nr) == 0)
366 push(&killed, p->pid);
368 printf("%s: warning: failed to kill %d: %s\n",
369 progname, p->pid, strerror(errno));
371 if (quietmode < 0 && killed) {
372 printf("stopped %s (pid", what);
373 for (p = killed; p; p = p->next)
374 printf(" %d", p->pid);
381 main(int argc, char **argv)
385 parse_options(argc, argv);
389 if (execname && stat(execname, &exec_stat))
390 fatal("stat %s: %s", execname, strerror(errno));
392 if (userspec && sscanf(userspec, "%d", &user_id) != 1) {
395 pw = getpwnam(userspec);
397 fatal("user `%s' not found\n", userspec);
399 user_id = pw->pw_uid;
414 printf("%s already running.\n", execname);
418 printf("would start %s ", startas);
420 printf("%s ", *argv++);
425 printf("starting %s ...\n", startas);
427 execv(startas, argv);
428 fatal("unable to start %s: %s", startas, strerror(errno));