1 // SPDX-License-Identifier: GPL-2.0
2 #include <internal/lib.h>
3 #include <subcmd/parse-options.h>
4 #include <api/fd/array.h>
6 #include <linux/zalloc.h>
7 #include <linux/string.h>
8 #include <linux/limits.h>
9 #include <linux/string.h>
18 #include <sys/inotify.h>
20 #include <sys/types.h>
21 #include <sys/socket.h>
24 #include <sys/signalfd.h>
35 #define SESSION_OUTPUT "output"
36 #define SESSION_CONTROL "control"
37 #define SESSION_ACK "ack"
42 * OK - session is up and running
43 * RECONFIG - session is pending for reconfiguration,
44 * new values are already loaded in session object
45 * KILL - session is pending to be killed
47 * Session object life and its state is maintained by
48 * following functions:
51 * - reads config file and setup session objects
52 * with following states:
54 * OK - no change needed
55 * RECONFIG - session needs to be changed
56 * (run variable changed)
57 * KILL - session needs to be killed
58 * (session is no longer in config file)
61 * - scans session objects and does following actions
65 * RECONFIG - session is killed and re-run with new config
66 * KILL - session is killed
68 * - all sessions have OK state on the function exit
70 enum daemon_session_state {
76 struct daemon_session {
82 struct list_head list;
83 enum daemon_session_state state;
92 const char *base_user;
94 struct list_head sessions;
101 static struct daemon __daemon = {
102 .sessions = LIST_HEAD_INIT(__daemon.sessions),
105 static const char * const daemon_usage[] = {
106 "perf daemon start [<options>]",
107 "perf daemon [<options>]",
113 static void sig_handler(int sig __maybe_unused)
118 static struct daemon_session *daemon__add_session(struct daemon *config, char *name)
120 struct daemon_session *session = zalloc(sizeof(*session));
125 session->name = strdup(name);
126 if (!session->name) {
132 list_add_tail(&session->list, &config->sessions);
136 static struct daemon_session *daemon__find_session(struct daemon *daemon, char *name)
138 struct daemon_session *session;
140 list_for_each_entry(session, &daemon->sessions, list) {
141 if (!strcmp(session->name, name))
148 static int get_session_name(const char *var, char *session, int len)
150 const char *p = var + sizeof("session-") - 1;
152 while (*p != '.' && *p != 0x0 && len--)
156 return *p == '.' ? 0 : -EINVAL;
159 static int session_config(struct daemon *daemon, const char *var, const char *value)
161 struct daemon_session *session;
164 if (get_session_name(var, name, sizeof(name) - 1))
167 var = strchr(var, '.');
173 session = daemon__find_session(daemon, name);
176 /* New session is defined. */
177 session = daemon__add_session(daemon, name);
181 pr_debug("reconfig: found new session %s\n", name);
183 /* Trigger reconfig to start it. */
184 session->state = RECONFIG;
185 } else if (session->state == KILL) {
186 /* Current session is defined, no action needed. */
187 pr_debug("reconfig: found current session %s\n", name);
191 if (!strcmp(var, "run")) {
195 same = !strcmp(session->run, value);
200 pr_debug("reconfig: session %s is changed\n", name);
203 session->run = strdup(value);
208 * Either new or changed run value is defined,
209 * trigger reconfig for the session.
211 session->state = RECONFIG;
218 static int server_config(const char *var, const char *value, void *cb)
220 struct daemon *daemon = cb;
222 if (strstarts(var, "session-")) {
223 return session_config(daemon, var, value);
224 } else if (!strcmp(var, "daemon.base") && !daemon->base_user) {
225 if (daemon->base && strcmp(daemon->base, value)) {
226 pr_err("failed: can't redefine base, bailing out\n");
229 daemon->base = strdup(value);
237 static int client_config(const char *var, const char *value, void *cb)
239 struct daemon *daemon = cb;
241 if (!strcmp(var, "daemon.base") && !daemon->base_user) {
242 daemon->base = strdup(value);
250 static int check_base(struct daemon *daemon)
255 pr_err("failed: base not defined\n");
259 if (stat(daemon->base, &st)) {
262 pr_err("failed: permission denied for '%s' base\n",
266 pr_err("failed: base '%s' does not exists\n",
270 pr_err("failed: can't access base '%s': %s\n",
271 daemon->base, strerror(errno));
276 if ((st.st_mode & S_IFMT) != S_IFDIR) {
277 pr_err("failed: base '%s' is not directory\n",
285 static int setup_client_config(struct daemon *daemon)
287 struct perf_config_set *set = perf_config_set__load_file(daemon->config_real);
291 err = perf_config_set(set, client_config, daemon);
292 perf_config_set__delete(set);
295 return err ?: check_base(daemon);
298 static int setup_server_config(struct daemon *daemon)
300 struct perf_config_set *set;
301 struct daemon_session *session;
304 pr_debug("reconfig: started\n");
307 * Mark all sessions for kill, the server config
308 * will set following states, see explanation at
309 * enum daemon_session_state declaration.
311 list_for_each_entry(session, &daemon->sessions, list)
312 session->state = KILL;
314 set = perf_config_set__load_file(daemon->config_real);
316 err = perf_config_set(set, server_config, daemon);
317 perf_config_set__delete(set);
320 return err ?: check_base(daemon);
323 static int daemon_session__run(struct daemon_session *session,
324 struct daemon *daemon)
330 if (asprintf(&session->base, "%s/session-%s",
331 daemon->base, session->name) < 0) {
332 perror("failed: asprintf");
336 if (mkdir(session->base, 0755) && errno != EEXIST) {
337 perror("failed: mkdir");
341 session->start = time(NULL);
343 session->pid = fork();
344 if (session->pid < 0)
346 if (session->pid > 0) {
347 pr_info("reconfig: ruining session [%s:%d]: %s\n",
348 session->name, session->pid, session->run);
352 if (chdir(session->base)) {
353 perror("failed: chdir");
357 fd = open("/dev/null", O_RDONLY);
359 perror("failed: open /dev/null");
366 fd = open(SESSION_OUTPUT, O_RDWR|O_CREAT|O_TRUNC, 0644);
368 perror("failed: open session output");
376 if (mkfifo(SESSION_CONTROL, 0600) && errno != EEXIST) {
377 perror("failed: create control fifo");
381 if (mkfifo(SESSION_ACK, 0600) && errno != EEXIST) {
382 perror("failed: create ack fifo");
386 scnprintf(buf, sizeof(buf), "%s record --control=fifo:%s,%s %s",
387 daemon->perf, SESSION_CONTROL, SESSION_ACK, session->run);
389 argv = argv_split(buf, &argc);
393 exit(execve(daemon->perf, argv, NULL));
397 static pid_t handle_signalfd(struct daemon *daemon)
399 struct daemon_session *session;
400 struct signalfd_siginfo si;
405 err = read(daemon->signal_fd, &si, sizeof(struct signalfd_siginfo));
406 if (err != sizeof(struct signalfd_siginfo))
409 list_for_each_entry(session, &daemon->sessions, list) {
411 if (session->pid != (int) si.ssi_pid)
414 pid = waitpid(session->pid, &status, 0);
415 if (pid == session->pid) {
416 if (WIFEXITED(status)) {
417 pr_info("session '%s' exited, status=%d\n",
418 session->name, WEXITSTATUS(status));
419 } else if (WIFSIGNALED(status)) {
420 pr_info("session '%s' killed (signal %d)\n",
421 session->name, WTERMSIG(status));
422 } else if (WIFSTOPPED(status)) {
423 pr_info("session '%s' stopped (signal %d)\n",
424 session->name, WSTOPSIG(status));
426 pr_info("session '%s' Unexpected status (0x%x)\n",
427 session->name, status);
431 session->state = KILL;
439 static int daemon_session__wait(struct daemon_session *session, struct daemon *daemon,
442 struct pollfd pollfd = {
443 .fd = daemon->signal_fd,
446 pid_t wpid = 0, pid = session->pid;
452 int err = poll(&pollfd, 1, 1000);
455 wpid = handle_signalfd(daemon);
456 } else if (err < 0) {
457 perror("failed: poll\n");
461 if (start + secs < time(NULL))
463 } while (wpid != pid);
468 static bool daemon__has_alive_session(struct daemon *daemon)
470 struct daemon_session *session;
472 list_for_each_entry(session, &daemon->sessions, list) {
473 if (session->pid != -1)
480 static int daemon__wait(struct daemon *daemon, int secs)
482 struct pollfd pollfd = {
483 .fd = daemon->signal_fd,
491 int err = poll(&pollfd, 1, 1000);
494 handle_signalfd(daemon);
495 } else if (err < 0) {
496 perror("failed: poll\n");
500 if (start + secs < time(NULL))
502 } while (daemon__has_alive_session(daemon));
507 static int daemon_session__control(struct daemon_session *session,
508 const char *msg, bool do_ack)
510 struct pollfd pollfd = { .events = POLLIN, };
511 char control_path[PATH_MAX];
512 char ack_path[PATH_MAX];
513 int control, ack = -1, len;
518 /* open the control file */
519 scnprintf(control_path, sizeof(control_path), "%s/%s",
520 session->base, SESSION_CONTROL);
522 control = open(control_path, O_WRONLY|O_NONBLOCK);
527 /* open the ack file */
528 scnprintf(ack_path, sizeof(ack_path), "%s/%s",
529 session->base, SESSION_ACK);
531 ack = open(ack_path, O_RDONLY, O_NONBLOCK);
538 /* write the command */
541 err = writen(control, msg, len);
543 pr_err("failed: write to control pipe: %d (%s)\n",
544 errno, control_path);
551 /* wait for an ack */
554 if (!poll(&pollfd, 1, 2000)) {
555 pr_err("failed: control ack timeout\n");
559 if (!(pollfd.revents & POLLIN)) {
560 pr_err("failed: did not received an ack\n");
564 err = read(ack, buf, sizeof(buf));
566 ret = strcmp(buf, "ack\n");
568 perror("failed: read ack %d\n");
578 static int setup_server_socket(struct daemon *daemon)
580 struct sockaddr_un addr;
582 int fd = socket(AF_UNIX, SOCK_STREAM, 0);
585 fprintf(stderr, "socket: %s\n", strerror(errno));
589 if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
590 perror("failed: fcntl FD_CLOEXEC");
595 scnprintf(path, sizeof(path), "%s/control", daemon->base);
597 if (strlen(path) + 1 >= sizeof(addr.sun_path)) {
598 pr_err("failed: control path too long '%s'\n", path);
603 memset(&addr, 0, sizeof(addr));
604 addr.sun_family = AF_UNIX;
606 strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
609 if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
610 perror("failed: bind");
615 if (listen(fd, 1) == -1) {
616 perror("failed: listen");
632 #define SESSION_MAX 64
648 char name[SESSION_MAX];
654 char name[SESSION_MAX];
664 static int daemon_session__ping(struct daemon_session *session)
666 return daemon_session__control(session, "ping", true) ? PING_FAIL : PING_OK;
669 static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
671 char csv_sep = cmd->list.csv_sep;
672 struct daemon_session *session;
673 time_t curr = time(NULL);
676 fprintf(out, "%d%c%s%c%s%c%s/%s",
678 getpid(), csv_sep, "daemon",
680 csv_sep, daemon->base,
682 csv_sep, daemon->base, SESSION_OUTPUT);
684 fprintf(out, "%c%s/%s",
686 csv_sep, daemon->base, "lock");
688 fprintf(out, "%c%lu",
689 /* session up time */
690 csv_sep, (curr - daemon->start) / 60);
694 fprintf(out, "[%d:daemon] base: %s\n", getpid(), daemon->base);
695 if (cmd->list.verbose) {
696 fprintf(out, " output: %s/%s\n",
697 daemon->base, SESSION_OUTPUT);
698 fprintf(out, " lock: %s/lock\n",
700 fprintf(out, " up: %lu minutes\n",
701 (curr - daemon->start) / 60);
705 list_for_each_entry(session, &daemon->sessions, list) {
707 fprintf(out, "%d%c%s%c%s",
711 csv_sep, session->name,
713 csv_sep, session->run);
715 fprintf(out, "%c%s%c%s/%s",
717 csv_sep, session->base,
719 csv_sep, session->base, SESSION_OUTPUT);
721 fprintf(out, "%c%s/%s%c%s/%s",
722 /* session control */
723 csv_sep, session->base, SESSION_CONTROL,
725 csv_sep, session->base, SESSION_ACK);
727 fprintf(out, "%c%lu",
728 /* session up time */
729 csv_sep, (curr - session->start) / 60);
733 fprintf(out, "[%d:%s] perf record %s\n",
734 session->pid, session->name, session->run);
735 if (!cmd->list.verbose)
737 fprintf(out, " base: %s\n",
739 fprintf(out, " output: %s/%s\n",
740 session->base, SESSION_OUTPUT);
741 fprintf(out, " control: %s/%s\n",
742 session->base, SESSION_CONTROL);
743 fprintf(out, " ack: %s/%s\n",
744 session->base, SESSION_ACK);
745 fprintf(out, " up: %lu minutes\n",
746 (curr - session->start) / 60);
753 static int daemon_session__signal(struct daemon_session *session, int sig)
755 if (session->pid < 0)
757 return kill(session->pid, sig);
760 static int cmd_session_kill(struct daemon *daemon, union cmd *cmd, FILE *out)
762 struct daemon_session *session;
765 all = !strcmp(cmd->signal.name, "all");
767 list_for_each_entry(session, &daemon->sessions, list) {
768 if (all || !strcmp(cmd->signal.name, session->name)) {
769 daemon_session__signal(session, cmd->signal.sig);
770 fprintf(out, "signal %d sent to session '%s [%d]'\n",
771 cmd->signal.sig, session->name, session->pid);
778 static const char *ping_str[PING_MAX] = {
780 [PING_FAIL] = "FAIL",
783 static int cmd_session_ping(struct daemon *daemon, union cmd *cmd, FILE *out)
785 struct daemon_session *session;
786 bool all = false, found = false;
788 all = !strcmp(cmd->ping.name, "all");
790 list_for_each_entry(session, &daemon->sessions, list) {
791 if (all || !strcmp(cmd->ping.name, session->name)) {
792 int state = daemon_session__ping(session);
794 fprintf(out, "%-4s %s\n", ping_str[state], session->name);
799 if (!found && !all) {
800 fprintf(out, "%-4s %s (not found)\n",
801 ping_str[PING_FAIL], cmd->ping.name);
806 static int handle_server_socket(struct daemon *daemon, int sock_fd)
812 fd = accept(sock_fd, NULL, NULL);
814 perror("failed: accept");
818 if (sizeof(cmd) != readn(fd, &cmd, sizeof(cmd))) {
819 perror("failed: read");
823 out = fdopen(fd, "w");
825 perror("failed: fdopen");
831 ret = cmd_session_list(daemon, &cmd, out);
834 ret = cmd_session_kill(daemon, &cmd, out);
839 pr_debug("perf daemon is exciting\n");
842 ret = cmd_session_ping(daemon, &cmd, out);
850 /* If out is defined, then fd is closed via fclose. */
856 static int setup_client_socket(struct daemon *daemon)
858 struct sockaddr_un addr;
860 int fd = socket(AF_UNIX, SOCK_STREAM, 0);
863 perror("failed: socket");
867 scnprintf(path, sizeof(path), "%s/control", daemon->base);
869 if (strlen(path) + 1 >= sizeof(addr.sun_path)) {
870 pr_err("failed: control path too long '%s'\n", path);
875 memset(&addr, 0, sizeof(addr));
876 addr.sun_family = AF_UNIX;
877 strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
879 if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
880 perror("failed: connect");
888 static void daemon_session__kill(struct daemon_session *session,
889 struct daemon *daemon)
896 daemon_session__control(session, "stop", false);
899 daemon_session__signal(session, SIGTERM);
902 daemon_session__signal(session, SIGKILL);
909 } while (daemon_session__wait(session, daemon, 10));
912 static void daemon__signal(struct daemon *daemon, int sig)
914 struct daemon_session *session;
916 list_for_each_entry(session, &daemon->sessions, list)
917 daemon_session__signal(session, sig);
920 static void daemon_session__delete(struct daemon_session *session)
928 static void daemon_session__remove(struct daemon_session *session)
930 list_del(&session->list);
931 daemon_session__delete(session);
934 static void daemon__stop(struct daemon *daemon)
936 struct daemon_session *session;
938 list_for_each_entry(session, &daemon->sessions, list)
939 daemon_session__control(session, "stop", false);
942 static void daemon__kill(struct daemon *daemon)
949 daemon__stop(daemon);
952 daemon__signal(daemon, SIGTERM);
955 daemon__signal(daemon, SIGKILL);
962 } while (daemon__wait(daemon, 10));
965 static void daemon__exit(struct daemon *daemon)
967 struct daemon_session *session, *h;
969 list_for_each_entry_safe(session, h, &daemon->sessions, list)
970 daemon_session__remove(session);
972 free(daemon->config_real);
973 free(daemon->config_base);
977 static int daemon__reconfig(struct daemon *daemon)
979 struct daemon_session *session, *n;
981 list_for_each_entry_safe(session, n, &daemon->sessions, list) {
983 if (session->state == OK)
986 /* Remove session. */
987 if (session->state == KILL) {
988 if (session->pid > 0) {
989 daemon_session__kill(session, daemon);
990 pr_info("reconfig: session '%s' killed\n", session->name);
992 daemon_session__remove(session);
996 /* Reconfig session. */
997 if (session->pid > 0) {
998 daemon_session__kill(session, daemon);
999 pr_info("reconfig: session '%s' killed\n", session->name);
1001 if (daemon_session__run(session, daemon))
1004 session->state = OK;
1010 static int setup_config_changes(struct daemon *daemon)
1012 char *basen = strdup(daemon->config_real);
1013 char *dirn = strdup(daemon->config_real);
1017 if (!dirn || !basen)
1020 fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC);
1022 perror("failed: inotify_init");
1026 dir = dirname(dirn);
1027 base = basename(basen);
1028 pr_debug("config file: %s, dir: %s\n", base, dir);
1030 wd = inotify_add_watch(fd, dir, IN_CLOSE_WRITE);
1032 daemon->config_base = strdup(base);
1033 if (!daemon->config_base) {
1038 perror("failed: inotify_add_watch");
1044 return wd < 0 ? -1 : fd;
1047 static bool process_inotify_event(struct daemon *daemon, char *buf, ssize_t len)
1051 while (p < (buf + len)) {
1052 struct inotify_event *event = (struct inotify_event *) p;
1055 * We monitor config directory, check if our
1056 * config file was changes.
1058 if ((event->mask & IN_CLOSE_WRITE) &&
1059 !(event->mask & IN_ISDIR)) {
1060 if (!strcmp(event->name, daemon->config_base))
1063 p += sizeof(*event) + event->len;
1068 static int handle_config_changes(struct daemon *daemon, int conf_fd,
1069 bool *config_changed)
1074 while (!(*config_changed)) {
1075 len = read(conf_fd, buf, sizeof(buf));
1077 if (errno != EAGAIN) {
1078 perror("failed: read");
1083 *config_changed = process_inotify_event(daemon, buf, len);
1088 static int setup_config(struct daemon *daemon)
1090 if (daemon->base_user) {
1091 daemon->base = strdup(daemon->base_user);
1096 if (daemon->config) {
1097 char *real = realpath(daemon->config, NULL);
1100 perror("failed: realpath");
1103 daemon->config_real = real;
1107 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK))
1108 daemon->config_real = strdup(perf_etc_perfconfig());
1109 else if (perf_config_global() && perf_home_perfconfig())
1110 daemon->config_real = strdup(perf_home_perfconfig());
1112 return daemon->config_real ? 0 : -1;
1118 #include <sys/file.h>
1120 static int lockf(int fd, int cmd, off_t len)
1122 if (cmd != F_TLOCK || len != 0)
1125 return flock(fd, LOCK_EX | LOCK_NB);
1130 * Each daemon tries to create and lock BASE/lock file,
1131 * if it's successful we are sure we're the only daemon
1132 * running over the BASE.
1134 * Once daemon is finished, file descriptor to lock file
1135 * is closed and lock is released.
1137 static int check_lock(struct daemon *daemon)
1139 char path[PATH_MAX];
1144 scnprintf(path, sizeof(path), "%s/lock", daemon->base);
1146 fd = open(path, O_RDWR|O_CREAT|O_CLOEXEC, 0640);
1150 if (lockf(fd, F_TLOCK, 0) < 0) {
1151 filename__read_int(path, &pid);
1152 fprintf(stderr, "failed: another perf daemon (pid %d) owns %s\n",
1158 scnprintf(buf, sizeof(buf), "%d", getpid());
1161 if (write(fd, buf, len) != len) {
1162 perror("failed: write");
1167 if (ftruncate(fd, len)) {
1168 perror("failed: ftruncate");
1176 static int go_background(struct daemon *daemon)
1190 if (check_lock(daemon))
1195 if (chdir(daemon->base)) {
1196 perror("failed: chdir");
1200 fd = open("output", O_RDWR|O_CREAT|O_TRUNC, 0644);
1202 perror("failed: open");
1206 if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
1207 perror("failed: fcntl FD_CLOEXEC");
1217 daemon->out = fdopen(1, "w");
1224 setbuf(daemon->out, NULL);
1228 static int setup_signalfd(struct daemon *daemon)
1233 sigaddset(&mask, SIGCHLD);
1235 if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
1238 daemon->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1239 return daemon->signal_fd;
1242 static int __cmd_start(struct daemon *daemon, struct option parent_options[],
1243 int argc, const char **argv)
1245 bool foreground = false;
1246 struct option start_options[] = {
1247 OPT_BOOLEAN('f', "foreground", &foreground, "stay on console"),
1248 OPT_PARENT(parent_options),
1251 int sock_fd = -1, conf_fd = -1, signal_fd = -1;
1252 int sock_pos, file_pos, signal_pos;
1256 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1258 usage_with_options(daemon_usage, start_options);
1260 daemon->start = time(NULL);
1262 if (setup_config(daemon)) {
1263 pr_err("failed: config not found\n");
1267 if (setup_server_config(daemon))
1270 if (foreground && check_lock(daemon))
1274 err = go_background(daemon);
1276 /* original process, exit normally */
1279 daemon__exit(daemon);
1284 debug_set_file(daemon->out);
1285 debug_set_display_time(true);
1287 pr_info("daemon started (pid %d)\n", getpid());
1289 fdarray__init(&fda, 3);
1291 sock_fd = setup_server_socket(daemon);
1295 conf_fd = setup_config_changes(daemon);
1299 signal_fd = setup_signalfd(daemon);
1303 sock_pos = fdarray__add(&fda, sock_fd, POLLIN|POLLERR|POLLHUP, 0);
1307 file_pos = fdarray__add(&fda, conf_fd, POLLIN|POLLERR|POLLHUP, 0);
1311 signal_pos = fdarray__add(&fda, signal_fd, POLLIN|POLLERR|POLLHUP, 0);
1315 signal(SIGINT, sig_handler);
1316 signal(SIGTERM, sig_handler);
1317 signal(SIGPIPE, SIG_IGN);
1319 while (!done && !err) {
1320 err = daemon__reconfig(daemon);
1322 if (!err && fdarray__poll(&fda, -1)) {
1323 bool reconfig = false;
1325 if (fda.entries[sock_pos].revents & POLLIN)
1326 err = handle_server_socket(daemon, sock_fd);
1327 if (fda.entries[file_pos].revents & POLLIN)
1328 err = handle_config_changes(daemon, conf_fd, &reconfig);
1329 if (fda.entries[signal_pos].revents & POLLIN)
1330 err = handle_signalfd(daemon) < 0;
1333 err = setup_server_config(daemon);
1338 fdarray__exit(&fda);
1340 daemon__kill(daemon);
1341 daemon__exit(daemon);
1350 pr_info("daemon exited\n");
1351 fclose(daemon->out);
1355 static int send_cmd(struct daemon *daemon, union cmd *cmd)
1363 if (setup_client_config(daemon))
1366 fd = setup_client_socket(daemon);
1370 if (sizeof(*cmd) != writen(fd, cmd, sizeof(*cmd))) {
1371 perror("failed: write");
1375 in = fdopen(fd, "r");
1377 perror("failed: fdopen");
1381 while ((nread = getline(&line, &len, in)) != -1) {
1382 if (fwrite(line, nread, 1, stdout) != 1)
1392 /* If in is defined, then fd is closed via fclose. */
1398 static int send_cmd_list(struct daemon *daemon)
1400 union cmd cmd = { .cmd = CMD_LIST, };
1402 cmd.list.verbose = verbose;
1403 cmd.list.csv_sep = daemon->csv_sep ? *daemon->csv_sep : 0;
1405 return send_cmd(daemon, &cmd);
1408 static int __cmd_signal(struct daemon *daemon, struct option parent_options[],
1409 int argc, const char **argv)
1411 const char *name = "all";
1412 struct option start_options[] = {
1413 OPT_STRING(0, "session", &name, "session",
1414 "Sent signal to specific session"),
1415 OPT_PARENT(parent_options),
1420 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1422 usage_with_options(daemon_usage, start_options);
1424 if (setup_config(daemon)) {
1425 pr_err("failed: config not found\n");
1429 cmd.signal.cmd = CMD_SIGNAL,
1430 cmd.signal.sig = SIGUSR2;
1431 strncpy(cmd.signal.name, name, sizeof(cmd.signal.name) - 1);
1433 return send_cmd(daemon, &cmd);
1436 static int __cmd_stop(struct daemon *daemon, struct option parent_options[],
1437 int argc, const char **argv)
1439 struct option start_options[] = {
1440 OPT_PARENT(parent_options),
1443 union cmd cmd = { .cmd = CMD_STOP, };
1445 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1447 usage_with_options(daemon_usage, start_options);
1449 if (setup_config(daemon)) {
1450 pr_err("failed: config not found\n");
1454 return send_cmd(daemon, &cmd);
1457 static int __cmd_ping(struct daemon *daemon, struct option parent_options[],
1458 int argc, const char **argv)
1460 const char *name = "all";
1461 struct option ping_options[] = {
1462 OPT_STRING(0, "session", &name, "session",
1463 "Ping to specific session"),
1464 OPT_PARENT(parent_options),
1467 union cmd cmd = { .cmd = CMD_PING, };
1469 argc = parse_options(argc, argv, ping_options, daemon_usage, 0);
1471 usage_with_options(daemon_usage, ping_options);
1473 if (setup_config(daemon)) {
1474 pr_err("failed: config not found\n");
1478 scnprintf(cmd.ping.name, sizeof(cmd.ping.name), "%s", name);
1479 return send_cmd(daemon, &cmd);
1482 int cmd_daemon(int argc, const char **argv)
1484 struct option daemon_options[] = {
1485 OPT_INCR('v', "verbose", &verbose, "be more verbose"),
1486 OPT_STRING(0, "config", &__daemon.config,
1487 "config file", "config file path"),
1488 OPT_STRING(0, "base", &__daemon.base_user,
1489 "directory", "base directory"),
1490 OPT_STRING_OPTARG('x', "field-separator", &__daemon.csv_sep,
1491 "field separator", "print counts with custom separator", ","),
1495 perf_exe(__daemon.perf, sizeof(__daemon.perf));
1496 __daemon.out = stdout;
1498 argc = parse_options(argc, argv, daemon_options, daemon_usage,
1499 PARSE_OPT_STOP_AT_NON_OPTION);
1502 if (!strcmp(argv[0], "start"))
1503 return __cmd_start(&__daemon, daemon_options, argc, argv);
1504 if (!strcmp(argv[0], "signal"))
1505 return __cmd_signal(&__daemon, daemon_options, argc, argv);
1506 else if (!strcmp(argv[0], "stop"))
1507 return __cmd_stop(&__daemon, daemon_options, argc, argv);
1508 else if (!strcmp(argv[0], "ping"))
1509 return __cmd_ping(&__daemon, daemon_options, argc, argv);
1511 pr_err("failed: unknown command '%s'\n", argv[0]);
1515 if (setup_config(&__daemon)) {
1516 pr_err("failed: config not found\n");
1520 return send_cmd_list(&__daemon);