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1// SPDX-License-Identifier: GPL-2.0
2#include <internal/lib.h>
3#include <inttypes.h>
4#include <subcmd/parse-options.h>
5#include <api/fd/array.h>
6#include <api/fs/fs.h>
7#include <linux/zalloc.h>
8#include <linux/string.h>
9#include <linux/limits.h>
10#include <string.h>
11#include <sys/file.h>
12#include <signal.h>
13#include <stdlib.h>
14#include <time.h>
15#include <stdio.h>
16#include <unistd.h>
17#include <errno.h>
18#include <sys/inotify.h>
19#include <libgen.h>
20#include <sys/types.h>
21#include <sys/socket.h>
22#include <sys/un.h>
23#include <sys/stat.h>
24#include <sys/signalfd.h>
25#include <sys/wait.h>
26#include <poll.h>
27#include "builtin.h"
28#include "perf.h"
29#include "debug.h"
30#include "config.h"
31#include "util.h"
32
33#define SESSION_OUTPUT "output"
34#define SESSION_CONTROL "control"
35#define SESSION_ACK "ack"
36
37/*
38 * Session states:
39 *
40 * OK - session is up and running
41 * RECONFIG - session is pending for reconfiguration,
42 * new values are already loaded in session object
43 * KILL - session is pending to be killed
44 *
45 * Session object life and its state is maintained by
46 * following functions:
47 *
48 * setup_server_config
49 * - reads config file and setup session objects
50 * with following states:
51 *
52 * OK - no change needed
53 * RECONFIG - session needs to be changed
54 * (run variable changed)
55 * KILL - session needs to be killed
56 * (session is no longer in config file)
57 *
58 * daemon__reconfig
59 * - scans session objects and does following actions
60 * for states:
61 *
62 * OK - skip
63 * RECONFIG - session is killed and re-run with new config
64 * KILL - session is killed
65 *
66 * - all sessions have OK state on the function exit
67 */
68enum daemon_session_state {
69 OK,
70 RECONFIG,
71 KILL,
72};
73
74struct daemon_session {
75 char *base;
76 char *name;
77 char *run;
78 char *control;
79 int pid;
80 struct list_head list;
81 enum daemon_session_state state;
82 time_t start;
83};
84
85struct daemon {
86 const char *config;
87 char *config_real;
88 char *config_base;
89 const char *csv_sep;
90 const char *base_user;
91 char *base;
92 struct list_head sessions;
93 FILE *out;
94 char *perf;
95 int signal_fd;
96 time_t start;
97};
98
99static struct daemon __daemon = {
100 .sessions = LIST_HEAD_INIT(__daemon.sessions),
101};
102
103static const char * const daemon_usage[] = {
104 "perf daemon {start|signal|stop|ping} [<options>]",
105 "perf daemon [<options>]",
106 NULL
107};
108
109static volatile sig_atomic_t done;
110
111static void sig_handler(int sig __maybe_unused)
112{
113 done = true;
114}
115
116static struct daemon_session *daemon__add_session(struct daemon *config, char *name)
117{
118 struct daemon_session *session = zalloc(sizeof(*session));
119
120 if (!session)
121 return NULL;
122
123 session->name = strdup(name);
124 if (!session->name) {
125 free(session);
126 return NULL;
127 }
128
129 session->pid = -1;
130 list_add_tail(&session->list, &config->sessions);
131 return session;
132}
133
134static struct daemon_session *daemon__find_session(struct daemon *daemon, char *name)
135{
136 struct daemon_session *session;
137
138 list_for_each_entry(session, &daemon->sessions, list) {
139 if (!strcmp(session->name, name))
140 return session;
141 }
142
143 return NULL;
144}
145
146static int get_session_name(const char *var, char *session, int len)
147{
148 const char *p = var + sizeof("session-") - 1;
149
150 while (*p != '.' && *p != 0x0 && len--)
151 *session++ = *p++;
152
153 *session = 0;
154 return *p == '.' ? 0 : -EINVAL;
155}
156
157static int session_config(struct daemon *daemon, const char *var, const char *value)
158{
159 struct daemon_session *session;
160 char name[100];
161
162 if (get_session_name(var, name, sizeof(name) - 1))
163 return -EINVAL;
164
165 var = strchr(var, '.');
166 if (!var)
167 return -EINVAL;
168
169 var++;
170
171 session = daemon__find_session(daemon, name);
172
173 if (!session) {
174 /* New session is defined. */
175 session = daemon__add_session(daemon, name);
176 if (!session)
177 return -ENOMEM;
178
179 pr_debug("reconfig: found new session %s\n", name);
180
181 /* Trigger reconfig to start it. */
182 session->state = RECONFIG;
183 } else if (session->state == KILL) {
184 /* Current session is defined, no action needed. */
185 pr_debug("reconfig: found current session %s\n", name);
186 session->state = OK;
187 }
188
189 if (!strcmp(var, "run")) {
190 bool same = false;
191
192 if (session->run)
193 same = !strcmp(session->run, value);
194
195 if (!same) {
196 if (session->run) {
197 zfree(&session->run);
198 pr_debug("reconfig: session %s is changed\n", name);
199 }
200
201 session->run = strdup(value);
202 if (!session->run)
203 return -ENOMEM;
204
205 /*
206 * Either new or changed run value is defined,
207 * trigger reconfig for the session.
208 */
209 session->state = RECONFIG;
210 }
211 }
212
213 return 0;
214}
215
216static int server_config(const char *var, const char *value, void *cb)
217{
218 struct daemon *daemon = cb;
219
220 if (strstarts(var, "session-")) {
221 return session_config(daemon, var, value);
222 } else if (!strcmp(var, "daemon.base") && !daemon->base_user) {
223 if (daemon->base && strcmp(daemon->base, value)) {
224 pr_err("failed: can't redefine base, bailing out\n");
225 return -EINVAL;
226 }
227 daemon->base = strdup(value);
228 if (!daemon->base)
229 return -ENOMEM;
230 }
231
232 return 0;
233}
234
235static int client_config(const char *var, const char *value, void *cb)
236{
237 struct daemon *daemon = cb;
238
239 if (!strcmp(var, "daemon.base") && !daemon->base_user) {
240 daemon->base = strdup(value);
241 if (!daemon->base)
242 return -ENOMEM;
243 }
244
245 return 0;
246}
247
248static int check_base(struct daemon *daemon)
249{
250 struct stat st;
251
252 if (!daemon->base) {
253 pr_err("failed: base not defined\n");
254 return -EINVAL;
255 }
256
257 if (stat(daemon->base, &st)) {
258 switch (errno) {
259 case EACCES:
260 pr_err("failed: permission denied for '%s' base\n",
261 daemon->base);
262 return -EACCES;
263 case ENOENT:
264 pr_err("failed: base '%s' does not exists\n",
265 daemon->base);
266 return -EACCES;
267 default:
268 pr_err("failed: can't access base '%s': %s\n",
269 daemon->base, strerror(errno));
270 return -errno;
271 }
272 }
273
274 if ((st.st_mode & S_IFMT) != S_IFDIR) {
275 pr_err("failed: base '%s' is not directory\n",
276 daemon->base);
277 return -EINVAL;
278 }
279
280 return 0;
281}
282
283static int setup_client_config(struct daemon *daemon)
284{
285 struct perf_config_set *set = perf_config_set__load_file(daemon->config_real);
286 int err = -ENOMEM;
287
288 if (set) {
289 err = perf_config_set(set, client_config, daemon);
290 perf_config_set__delete(set);
291 }
292
293 return err ?: check_base(daemon);
294}
295
296static int setup_server_config(struct daemon *daemon)
297{
298 struct perf_config_set *set;
299 struct daemon_session *session;
300 int err = -ENOMEM;
301
302 pr_debug("reconfig: started\n");
303
304 /*
305 * Mark all sessions for kill, the server config
306 * will set following states, see explanation at
307 * enum daemon_session_state declaration.
308 */
309 list_for_each_entry(session, &daemon->sessions, list)
310 session->state = KILL;
311
312 set = perf_config_set__load_file(daemon->config_real);
313 if (set) {
314 err = perf_config_set(set, server_config, daemon);
315 perf_config_set__delete(set);
316 }
317
318 return err ?: check_base(daemon);
319}
320
321static int daemon_session__run(struct daemon_session *session,
322 struct daemon *daemon)
323{
324 char buf[PATH_MAX];
325 char **argv;
326 int argc, fd;
327
328 if (asprintf(&session->base, "%s/session-%s",
329 daemon->base, session->name) < 0) {
330 perror("failed: asprintf");
331 return -1;
332 }
333
334 if (mkdir(session->base, 0755) && errno != EEXIST) {
335 perror("failed: mkdir");
336 return -1;
337 }
338
339 session->start = time(NULL);
340
341 session->pid = fork();
342 if (session->pid < 0)
343 return -1;
344 if (session->pid > 0) {
345 pr_info("reconfig: ruining session [%s:%d]: %s\n",
346 session->name, session->pid, session->run);
347 return 0;
348 }
349
350 if (chdir(session->base)) {
351 perror("failed: chdir");
352 return -1;
353 }
354
355 fd = open("/dev/null", O_RDONLY);
356 if (fd < 0) {
357 perror("failed: open /dev/null");
358 return -1;
359 }
360
361 dup2(fd, 0);
362 close(fd);
363
364 fd = open(SESSION_OUTPUT, O_RDWR|O_CREAT|O_TRUNC, 0644);
365 if (fd < 0) {
366 perror("failed: open session output");
367 return -1;
368 }
369
370 dup2(fd, 1);
371 dup2(fd, 2);
372 close(fd);
373
374 if (mkfifo(SESSION_CONTROL, 0600) && errno != EEXIST) {
375 perror("failed: create control fifo");
376 return -1;
377 }
378
379 if (mkfifo(SESSION_ACK, 0600) && errno != EEXIST) {
380 perror("failed: create ack fifo");
381 return -1;
382 }
383
384 scnprintf(buf, sizeof(buf), "%s record --control=fifo:%s,%s %s",
385 daemon->perf, SESSION_CONTROL, SESSION_ACK, session->run);
386
387 argv = argv_split(buf, &argc);
388 if (!argv)
389 exit(-1);
390
391 exit(execve(daemon->perf, argv, NULL));
392 return -1;
393}
394
395static pid_t handle_signalfd(struct daemon *daemon)
396{
397 struct daemon_session *session;
398 struct signalfd_siginfo si;
399 ssize_t err;
400 int status;
401 pid_t pid;
402
403 /*
404 * Take signal fd data as pure signal notification and check all
405 * the sessions state. The reason is that multiple signals can get
406 * coalesced in kernel and we can receive only single signal even
407 * if multiple SIGCHLD were generated.
408 */
409 err = read(daemon->signal_fd, &si, sizeof(struct signalfd_siginfo));
410 if (err != sizeof(struct signalfd_siginfo)) {
411 pr_err("failed to read signal fd\n");
412 return -1;
413 }
414
415 list_for_each_entry(session, &daemon->sessions, list) {
416 if (session->pid == -1)
417 continue;
418
419 pid = waitpid(session->pid, &status, WNOHANG);
420 if (pid <= 0)
421 continue;
422
423 if (WIFEXITED(status)) {
424 pr_info("session '%s' exited, status=%d\n",
425 session->name, WEXITSTATUS(status));
426 } else if (WIFSIGNALED(status)) {
427 pr_info("session '%s' killed (signal %d)\n",
428 session->name, WTERMSIG(status));
429 } else if (WIFSTOPPED(status)) {
430 pr_info("session '%s' stopped (signal %d)\n",
431 session->name, WSTOPSIG(status));
432 } else {
433 pr_info("session '%s' Unexpected status (0x%x)\n",
434 session->name, status);
435 }
436
437 session->state = KILL;
438 session->pid = -1;
439 }
440
441 return 0;
442}
443
444static int daemon_session__wait(struct daemon_session *session, struct daemon *daemon,
445 int secs)
446{
447 struct pollfd pollfd = {
448 .fd = daemon->signal_fd,
449 .events = POLLIN,
450 };
451 time_t start;
452
453 start = time(NULL);
454
455 do {
456 int err = poll(&pollfd, 1, 1000);
457
458 if (err > 0) {
459 handle_signalfd(daemon);
460 } else if (err < 0) {
461 perror("failed: poll\n");
462 return -1;
463 }
464
465 if (start + secs < time(NULL))
466 return -1;
467 } while (session->pid != -1);
468
469 return 0;
470}
471
472static bool daemon__has_alive_session(struct daemon *daemon)
473{
474 struct daemon_session *session;
475
476 list_for_each_entry(session, &daemon->sessions, list) {
477 if (session->pid != -1)
478 return true;
479 }
480
481 return false;
482}
483
484static int daemon__wait(struct daemon *daemon, int secs)
485{
486 struct pollfd pollfd = {
487 .fd = daemon->signal_fd,
488 .events = POLLIN,
489 };
490 time_t start;
491
492 start = time(NULL);
493
494 do {
495 int err = poll(&pollfd, 1, 1000);
496
497 if (err > 0) {
498 handle_signalfd(daemon);
499 } else if (err < 0) {
500 perror("failed: poll\n");
501 return -1;
502 }
503
504 if (start + secs < time(NULL))
505 return -1;
506 } while (daemon__has_alive_session(daemon));
507
508 return 0;
509}
510
511static int daemon_session__control(struct daemon_session *session,
512 const char *msg, bool do_ack)
513{
514 struct pollfd pollfd = { .events = POLLIN, };
515 char control_path[PATH_MAX];
516 char ack_path[PATH_MAX];
517 int control, ack = -1, len;
518 char buf[20];
519 int ret = -1;
520 ssize_t err;
521
522 /* open the control file */
523 scnprintf(control_path, sizeof(control_path), "%s/%s",
524 session->base, SESSION_CONTROL);
525
526 control = open(control_path, O_WRONLY|O_NONBLOCK);
527 if (control < 0)
528 return -1;
529
530 if (do_ack) {
531 /* open the ack file */
532 scnprintf(ack_path, sizeof(ack_path), "%s/%s",
533 session->base, SESSION_ACK);
534
535 ack = open(ack_path, O_RDONLY, O_NONBLOCK);
536 if (ack < 0) {
537 close(control);
538 return -1;
539 }
540 }
541
542 /* write the command */
543 len = strlen(msg);
544
545 err = writen(control, msg, len);
546 if (err != len) {
547 pr_err("failed: write to control pipe: %d (%s)\n",
548 errno, control_path);
549 goto out;
550 }
551
552 if (!do_ack)
553 goto out;
554
555 /* wait for an ack */
556 pollfd.fd = ack;
557
558 if (!poll(&pollfd, 1, 2000)) {
559 pr_err("failed: control ack timeout\n");
560 goto out;
561 }
562
563 if (!(pollfd.revents & POLLIN)) {
564 pr_err("failed: did not received an ack\n");
565 goto out;
566 }
567
568 err = read(ack, buf, sizeof(buf));
569 if (err > 0)
570 ret = strcmp(buf, "ack\n");
571 else
572 perror("failed: read ack %d\n");
573
574out:
575 if (ack != -1)
576 close(ack);
577
578 close(control);
579 return ret;
580}
581
582static int setup_server_socket(struct daemon *daemon)
583{
584 struct sockaddr_un addr;
585 char path[PATH_MAX];
586 int fd = socket(AF_UNIX, SOCK_STREAM, 0);
587
588 if (fd < 0) {
589 fprintf(stderr, "socket: %s\n", strerror(errno));
590 return -1;
591 }
592
593 if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
594 perror("failed: fcntl FD_CLOEXEC");
595 close(fd);
596 return -1;
597 }
598
599 scnprintf(path, sizeof(path), "%s/control", daemon->base);
600
601 if (strlen(path) + 1 >= sizeof(addr.sun_path)) {
602 pr_err("failed: control path too long '%s'\n", path);
603 close(fd);
604 return -1;
605 }
606
607 memset(&addr, 0, sizeof(addr));
608 addr.sun_family = AF_UNIX;
609
610 strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
611 unlink(path);
612
613 if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
614 perror("failed: bind");
615 close(fd);
616 return -1;
617 }
618
619 if (listen(fd, 1) == -1) {
620 perror("failed: listen");
621 close(fd);
622 return -1;
623 }
624
625 return fd;
626}
627
628enum {
629 CMD_LIST = 0,
630 CMD_SIGNAL = 1,
631 CMD_STOP = 2,
632 CMD_PING = 3,
633 CMD_MAX,
634};
635
636#define SESSION_MAX 64
637
638union cmd {
639 int cmd;
640
641 /* CMD_LIST */
642 struct {
643 int cmd;
644 int verbose;
645 char csv_sep;
646 } list;
647
648 /* CMD_SIGNAL */
649 struct {
650 int cmd;
651 int sig;
652 char name[SESSION_MAX];
653 } signal;
654
655 /* CMD_PING */
656 struct {
657 int cmd;
658 char name[SESSION_MAX];
659 } ping;
660};
661
662enum {
663 PING_OK = 0,
664 PING_FAIL = 1,
665 PING_MAX,
666};
667
668static int daemon_session__ping(struct daemon_session *session)
669{
670 return daemon_session__control(session, "ping", true) ? PING_FAIL : PING_OK;
671}
672
673static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
674{
675 char csv_sep = cmd->list.csv_sep;
676 struct daemon_session *session;
677 time_t curr = time(NULL);
678
679 if (csv_sep) {
680 fprintf(out, "%d%c%s%c%s%c%s/%s",
681 /* pid daemon */
682 getpid(), csv_sep, "daemon",
683 /* base */
684 csv_sep, daemon->base,
685 /* output */
686 csv_sep, daemon->base, SESSION_OUTPUT);
687
688 fprintf(out, "%c%s/%s",
689 /* lock */
690 csv_sep, daemon->base, "lock");
691
692 fprintf(out, "%c%" PRIu64,
693 /* session up time */
694 csv_sep, (uint64_t)((curr - daemon->start) / 60));
695
696 fprintf(out, "\n");
697 } else {
698 fprintf(out, "[%d:daemon] base: %s\n", getpid(), daemon->base);
699 if (cmd->list.verbose) {
700 fprintf(out, " output: %s/%s\n",
701 daemon->base, SESSION_OUTPUT);
702 fprintf(out, " lock: %s/lock\n",
703 daemon->base);
704 fprintf(out, " up: %" PRIu64 " minutes\n",
705 (uint64_t)((curr - daemon->start) / 60));
706 }
707 }
708
709 list_for_each_entry(session, &daemon->sessions, list) {
710 if (csv_sep) {
711 fprintf(out, "%d%c%s%c%s",
712 /* pid */
713 session->pid,
714 /* name */
715 csv_sep, session->name,
716 /* base */
717 csv_sep, session->run);
718
719 fprintf(out, "%c%s%c%s/%s",
720 /* session dir */
721 csv_sep, session->base,
722 /* session output */
723 csv_sep, session->base, SESSION_OUTPUT);
724
725 fprintf(out, "%c%s/%s%c%s/%s",
726 /* session control */
727 csv_sep, session->base, SESSION_CONTROL,
728 /* session ack */
729 csv_sep, session->base, SESSION_ACK);
730
731 fprintf(out, "%c%" PRIu64,
732 /* session up time */
733 csv_sep, (uint64_t)((curr - session->start) / 60));
734
735 fprintf(out, "\n");
736 } else {
737 fprintf(out, "[%d:%s] perf record %s\n",
738 session->pid, session->name, session->run);
739 if (!cmd->list.verbose)
740 continue;
741 fprintf(out, " base: %s\n",
742 session->base);
743 fprintf(out, " output: %s/%s\n",
744 session->base, SESSION_OUTPUT);
745 fprintf(out, " control: %s/%s\n",
746 session->base, SESSION_CONTROL);
747 fprintf(out, " ack: %s/%s\n",
748 session->base, SESSION_ACK);
749 fprintf(out, " up: %" PRIu64 " minutes\n",
750 (uint64_t)((curr - session->start) / 60));
751 }
752 }
753
754 return 0;
755}
756
757static int daemon_session__signal(struct daemon_session *session, int sig)
758{
759 if (session->pid < 0)
760 return -1;
761 return kill(session->pid, sig);
762}
763
764static int cmd_session_kill(struct daemon *daemon, union cmd *cmd, FILE *out)
765{
766 struct daemon_session *session;
767 bool all = false;
768
769 all = !strcmp(cmd->signal.name, "all");
770
771 list_for_each_entry(session, &daemon->sessions, list) {
772 if (all || !strcmp(cmd->signal.name, session->name)) {
773 daemon_session__signal(session, cmd->signal.sig);
774 fprintf(out, "signal %d sent to session '%s [%d]'\n",
775 cmd->signal.sig, session->name, session->pid);
776 }
777 }
778
779 return 0;
780}
781
782static const char *ping_str[PING_MAX] = {
783 [PING_OK] = "OK",
784 [PING_FAIL] = "FAIL",
785};
786
787static int cmd_session_ping(struct daemon *daemon, union cmd *cmd, FILE *out)
788{
789 struct daemon_session *session;
790 bool all = false, found = false;
791
792 all = !strcmp(cmd->ping.name, "all");
793
794 list_for_each_entry(session, &daemon->sessions, list) {
795 if (all || !strcmp(cmd->ping.name, session->name)) {
796 int state = daemon_session__ping(session);
797
798 fprintf(out, "%-4s %s\n", ping_str[state], session->name);
799 found = true;
800 }
801 }
802
803 if (!found && !all) {
804 fprintf(out, "%-4s %s (not found)\n",
805 ping_str[PING_FAIL], cmd->ping.name);
806 }
807 return 0;
808}
809
810static int handle_server_socket(struct daemon *daemon, int sock_fd)
811{
812 int ret = -1, fd;
813 FILE *out = NULL;
814 union cmd cmd;
815
816 fd = accept(sock_fd, NULL, NULL);
817 if (fd < 0) {
818 perror("failed: accept");
819 return -1;
820 }
821
822 if (sizeof(cmd) != readn(fd, &cmd, sizeof(cmd))) {
823 perror("failed: read");
824 goto out;
825 }
826
827 out = fdopen(fd, "w");
828 if (!out) {
829 perror("failed: fdopen");
830 goto out;
831 }
832
833 switch (cmd.cmd) {
834 case CMD_LIST:
835 ret = cmd_session_list(daemon, &cmd, out);
836 break;
837 case CMD_SIGNAL:
838 ret = cmd_session_kill(daemon, &cmd, out);
839 break;
840 case CMD_STOP:
841 done = 1;
842 ret = 0;
843 pr_debug("perf daemon is exciting\n");
844 break;
845 case CMD_PING:
846 ret = cmd_session_ping(daemon, &cmd, out);
847 break;
848 default:
849 break;
850 }
851
852 fclose(out);
853out:
854 /* If out is defined, then fd is closed via fclose. */
855 if (!out)
856 close(fd);
857 return ret;
858}
859
860static int setup_client_socket(struct daemon *daemon)
861{
862 struct sockaddr_un addr;
863 char path[PATH_MAX];
864 int fd = socket(AF_UNIX, SOCK_STREAM, 0);
865
866 if (fd == -1) {
867 perror("failed: socket");
868 return -1;
869 }
870
871 scnprintf(path, sizeof(path), "%s/control", daemon->base);
872
873 if (strlen(path) + 1 >= sizeof(addr.sun_path)) {
874 pr_err("failed: control path too long '%s'\n", path);
875 close(fd);
876 return -1;
877 }
878
879 memset(&addr, 0, sizeof(addr));
880 addr.sun_family = AF_UNIX;
881 strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
882
883 if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
884 perror("failed: connect");
885 close(fd);
886 return -1;
887 }
888
889 return fd;
890}
891
892static void daemon_session__kill(struct daemon_session *session,
893 struct daemon *daemon)
894{
895 int how = 0;
896
897 do {
898 switch (how) {
899 case 0:
900 daemon_session__control(session, "stop", false);
901 break;
902 case 1:
903 daemon_session__signal(session, SIGTERM);
904 break;
905 case 2:
906 daemon_session__signal(session, SIGKILL);
907 break;
908 default:
909 pr_err("failed to wait for session %s\n",
910 session->name);
911 return;
912 }
913 how++;
914
915 } while (daemon_session__wait(session, daemon, 10));
916}
917
918static void daemon__signal(struct daemon *daemon, int sig)
919{
920 struct daemon_session *session;
921
922 list_for_each_entry(session, &daemon->sessions, list)
923 daemon_session__signal(session, sig);
924}
925
926static void daemon_session__delete(struct daemon_session *session)
927{
928 zfree(&session->base);
929 zfree(&session->name);
930 zfree(&session->run);
931 free(session);
932}
933
934static void daemon_session__remove(struct daemon_session *session)
935{
936 list_del(&session->list);
937 daemon_session__delete(session);
938}
939
940static void daemon__stop(struct daemon *daemon)
941{
942 struct daemon_session *session;
943
944 list_for_each_entry(session, &daemon->sessions, list)
945 daemon_session__control(session, "stop", false);
946}
947
948static void daemon__kill(struct daemon *daemon)
949{
950 int how = 0;
951
952 do {
953 switch (how) {
954 case 0:
955 daemon__stop(daemon);
956 break;
957 case 1:
958 daemon__signal(daemon, SIGTERM);
959 break;
960 case 2:
961 daemon__signal(daemon, SIGKILL);
962 break;
963 default:
964 pr_err("failed to wait for sessions\n");
965 return;
966 }
967 how++;
968
969 } while (daemon__wait(daemon, 10));
970}
971
972static void daemon__exit(struct daemon *daemon)
973{
974 struct daemon_session *session, *h;
975
976 list_for_each_entry_safe(session, h, &daemon->sessions, list)
977 daemon_session__remove(session);
978
979 zfree(&daemon->config_real);
980 zfree(&daemon->config_base);
981 zfree(&daemon->base);
982}
983
984static int daemon__reconfig(struct daemon *daemon)
985{
986 struct daemon_session *session, *n;
987
988 list_for_each_entry_safe(session, n, &daemon->sessions, list) {
989 /* No change. */
990 if (session->state == OK)
991 continue;
992
993 /* Remove session. */
994 if (session->state == KILL) {
995 if (session->pid > 0) {
996 daemon_session__kill(session, daemon);
997 pr_info("reconfig: session '%s' killed\n", session->name);
998 }
999 daemon_session__remove(session);
1000 continue;
1001 }
1002
1003 /* Reconfig session. */
1004 if (session->pid > 0) {
1005 daemon_session__kill(session, daemon);
1006 pr_info("reconfig: session '%s' killed\n", session->name);
1007 }
1008 if (daemon_session__run(session, daemon))
1009 return -1;
1010
1011 session->state = OK;
1012 }
1013
1014 return 0;
1015}
1016
1017static int setup_config_changes(struct daemon *daemon)
1018{
1019 char *basen = strdup(daemon->config_real);
1020 char *dirn = strdup(daemon->config_real);
1021 char *base, *dir;
1022 int fd, wd = -1;
1023
1024 if (!dirn || !basen)
1025 goto out;
1026
1027 fd = inotify_init1(IN_NONBLOCK|O_CLOEXEC);
1028 if (fd < 0) {
1029 perror("failed: inotify_init");
1030 goto out;
1031 }
1032
1033 dir = dirname(dirn);
1034 base = basename(basen);
1035 pr_debug("config file: %s, dir: %s\n", base, dir);
1036
1037 wd = inotify_add_watch(fd, dir, IN_CLOSE_WRITE);
1038 if (wd >= 0) {
1039 daemon->config_base = strdup(base);
1040 if (!daemon->config_base) {
1041 close(fd);
1042 wd = -1;
1043 }
1044 } else {
1045 perror("failed: inotify_add_watch");
1046 }
1047
1048out:
1049 free(basen);
1050 free(dirn);
1051 return wd < 0 ? -1 : fd;
1052}
1053
1054static bool process_inotify_event(struct daemon *daemon, char *buf, ssize_t len)
1055{
1056 char *p = buf;
1057
1058 while (p < (buf + len)) {
1059 struct inotify_event *event = (struct inotify_event *) p;
1060
1061 /*
1062 * We monitor config directory, check if our
1063 * config file was changes.
1064 */
1065 if ((event->mask & IN_CLOSE_WRITE) &&
1066 !(event->mask & IN_ISDIR)) {
1067 if (!strcmp(event->name, daemon->config_base))
1068 return true;
1069 }
1070 p += sizeof(*event) + event->len;
1071 }
1072 return false;
1073}
1074
1075static int handle_config_changes(struct daemon *daemon, int conf_fd,
1076 bool *config_changed)
1077{
1078 char buf[4096];
1079 ssize_t len;
1080
1081 while (!(*config_changed)) {
1082 len = read(conf_fd, buf, sizeof(buf));
1083 if (len == -1) {
1084 if (errno != EAGAIN) {
1085 perror("failed: read");
1086 return -1;
1087 }
1088 return 0;
1089 }
1090 *config_changed = process_inotify_event(daemon, buf, len);
1091 }
1092 return 0;
1093}
1094
1095static int setup_config(struct daemon *daemon)
1096{
1097 if (daemon->base_user) {
1098 daemon->base = strdup(daemon->base_user);
1099 if (!daemon->base)
1100 return -ENOMEM;
1101 }
1102
1103 if (daemon->config) {
1104 char *real = realpath(daemon->config, NULL);
1105
1106 if (!real) {
1107 perror("failed: realpath");
1108 return -1;
1109 }
1110 daemon->config_real = real;
1111 return 0;
1112 }
1113
1114 if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK))
1115 daemon->config_real = strdup(perf_etc_perfconfig());
1116 else if (perf_config_global() && perf_home_perfconfig())
1117 daemon->config_real = strdup(perf_home_perfconfig());
1118
1119 return daemon->config_real ? 0 : -1;
1120}
1121
1122#ifndef F_TLOCK
1123#define F_TLOCK 2
1124
1125static int lockf(int fd, int cmd, off_t len)
1126{
1127 if (cmd != F_TLOCK || len != 0)
1128 return -1;
1129
1130 return flock(fd, LOCK_EX | LOCK_NB);
1131}
1132#endif // F_TLOCK
1133
1134/*
1135 * Each daemon tries to create and lock BASE/lock file,
1136 * if it's successful we are sure we're the only daemon
1137 * running over the BASE.
1138 *
1139 * Once daemon is finished, file descriptor to lock file
1140 * is closed and lock is released.
1141 */
1142static int check_lock(struct daemon *daemon)
1143{
1144 char path[PATH_MAX];
1145 char buf[20];
1146 int fd, pid;
1147 ssize_t len;
1148
1149 scnprintf(path, sizeof(path), "%s/lock", daemon->base);
1150
1151 fd = open(path, O_RDWR|O_CREAT|O_CLOEXEC, 0640);
1152 if (fd < 0)
1153 return -1;
1154
1155 if (lockf(fd, F_TLOCK, 0) < 0) {
1156 filename__read_int(path, &pid);
1157 fprintf(stderr, "failed: another perf daemon (pid %d) owns %s\n",
1158 pid, daemon->base);
1159 close(fd);
1160 return -1;
1161 }
1162
1163 scnprintf(buf, sizeof(buf), "%d", getpid());
1164 len = strlen(buf);
1165
1166 if (write(fd, buf, len) != len) {
1167 perror("failed: write");
1168 close(fd);
1169 return -1;
1170 }
1171
1172 if (ftruncate(fd, len)) {
1173 perror("failed: ftruncate");
1174 close(fd);
1175 return -1;
1176 }
1177
1178 return 0;
1179}
1180
1181static int go_background(struct daemon *daemon)
1182{
1183 int pid, fd;
1184
1185 pid = fork();
1186 if (pid < 0)
1187 return -1;
1188
1189 if (pid > 0)
1190 return 1;
1191
1192 if (setsid() < 0)
1193 return -1;
1194
1195 if (check_lock(daemon))
1196 return -1;
1197
1198 umask(0);
1199
1200 if (chdir(daemon->base)) {
1201 perror("failed: chdir");
1202 return -1;
1203 }
1204
1205 fd = open("output", O_RDWR|O_CREAT|O_TRUNC, 0644);
1206 if (fd < 0) {
1207 perror("failed: open");
1208 return -1;
1209 }
1210
1211 if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
1212 perror("failed: fcntl FD_CLOEXEC");
1213 close(fd);
1214 return -1;
1215 }
1216
1217 close(0);
1218 dup2(fd, 1);
1219 dup2(fd, 2);
1220 close(fd);
1221
1222 daemon->out = fdopen(1, "w");
1223 if (!daemon->out) {
1224 close(1);
1225 close(2);
1226 return -1;
1227 }
1228
1229 setbuf(daemon->out, NULL);
1230 return 0;
1231}
1232
1233static int setup_signalfd(struct daemon *daemon)
1234{
1235 sigset_t mask;
1236
1237 sigemptyset(&mask);
1238 sigaddset(&mask, SIGCHLD);
1239
1240 if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)
1241 return -1;
1242
1243 daemon->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1244 return daemon->signal_fd;
1245}
1246
1247static int __cmd_start(struct daemon *daemon, struct option parent_options[],
1248 int argc, const char **argv)
1249{
1250 bool foreground = false;
1251 struct option start_options[] = {
1252 OPT_BOOLEAN('f', "foreground", &foreground, "stay on console"),
1253 OPT_PARENT(parent_options),
1254 OPT_END()
1255 };
1256 int sock_fd = -1, conf_fd = -1, signal_fd = -1;
1257 int sock_pos, file_pos, signal_pos;
1258 struct fdarray fda;
1259 int err = 0;
1260
1261 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1262 if (argc)
1263 usage_with_options(daemon_usage, start_options);
1264
1265 daemon->start = time(NULL);
1266
1267 if (setup_config(daemon)) {
1268 pr_err("failed: config not found\n");
1269 return -1;
1270 }
1271
1272 if (setup_server_config(daemon))
1273 return -1;
1274
1275 if (foreground && check_lock(daemon))
1276 return -1;
1277
1278 if (!foreground) {
1279 err = go_background(daemon);
1280 if (err) {
1281 /* original process, exit normally */
1282 if (err == 1)
1283 err = 0;
1284 daemon__exit(daemon);
1285 return err;
1286 }
1287 }
1288
1289 debug_set_file(daemon->out);
1290 debug_set_display_time(true);
1291
1292 pr_info("daemon started (pid %d)\n", getpid());
1293
1294 fdarray__init(&fda, 3);
1295
1296 sock_fd = setup_server_socket(daemon);
1297 if (sock_fd < 0)
1298 goto out;
1299
1300 conf_fd = setup_config_changes(daemon);
1301 if (conf_fd < 0)
1302 goto out;
1303
1304 signal_fd = setup_signalfd(daemon);
1305 if (signal_fd < 0)
1306 goto out;
1307
1308 sock_pos = fdarray__add(&fda, sock_fd, POLLIN|POLLERR|POLLHUP, 0);
1309 if (sock_pos < 0)
1310 goto out;
1311
1312 file_pos = fdarray__add(&fda, conf_fd, POLLIN|POLLERR|POLLHUP, 0);
1313 if (file_pos < 0)
1314 goto out;
1315
1316 signal_pos = fdarray__add(&fda, signal_fd, POLLIN|POLLERR|POLLHUP, 0);
1317 if (signal_pos < 0)
1318 goto out;
1319
1320 signal(SIGINT, sig_handler);
1321 signal(SIGTERM, sig_handler);
1322 signal(SIGPIPE, SIG_IGN);
1323
1324 while (!done && !err) {
1325 err = daemon__reconfig(daemon);
1326
1327 if (!err && fdarray__poll(&fda, -1)) {
1328 bool reconfig = false;
1329
1330 if (fda.entries[sock_pos].revents & POLLIN)
1331 err = handle_server_socket(daemon, sock_fd);
1332 if (fda.entries[file_pos].revents & POLLIN)
1333 err = handle_config_changes(daemon, conf_fd, &reconfig);
1334 if (fda.entries[signal_pos].revents & POLLIN)
1335 err = handle_signalfd(daemon) < 0;
1336
1337 if (reconfig)
1338 err = setup_server_config(daemon);
1339 }
1340 }
1341
1342out:
1343 fdarray__exit(&fda);
1344
1345 daemon__kill(daemon);
1346 daemon__exit(daemon);
1347
1348 if (sock_fd != -1)
1349 close(sock_fd);
1350 if (conf_fd != -1)
1351 close(conf_fd);
1352 if (signal_fd != -1)
1353 close(signal_fd);
1354
1355 pr_info("daemon exited\n");
1356 fclose(daemon->out);
1357 return err;
1358}
1359
1360static int send_cmd(struct daemon *daemon, union cmd *cmd)
1361{
1362 int ret = -1, fd;
1363 char *line = NULL;
1364 size_t len = 0;
1365 ssize_t nread;
1366 FILE *in = NULL;
1367
1368 if (setup_client_config(daemon))
1369 return -1;
1370
1371 fd = setup_client_socket(daemon);
1372 if (fd < 0)
1373 return -1;
1374
1375 if (sizeof(*cmd) != writen(fd, cmd, sizeof(*cmd))) {
1376 perror("failed: write");
1377 goto out;
1378 }
1379
1380 in = fdopen(fd, "r");
1381 if (!in) {
1382 perror("failed: fdopen");
1383 goto out;
1384 }
1385
1386 while ((nread = getline(&line, &len, in)) != -1) {
1387 if (fwrite(line, nread, 1, stdout) != 1)
1388 goto out_fclose;
1389 fflush(stdout);
1390 }
1391
1392 ret = 0;
1393out_fclose:
1394 fclose(in);
1395 free(line);
1396out:
1397 /* If in is defined, then fd is closed via fclose. */
1398 if (!in)
1399 close(fd);
1400 return ret;
1401}
1402
1403static int send_cmd_list(struct daemon *daemon)
1404{
1405 union cmd cmd;
1406
1407 memset(&cmd, 0, sizeof(cmd));
1408 cmd.list.cmd = CMD_LIST;
1409 cmd.list.verbose = verbose;
1410 cmd.list.csv_sep = daemon->csv_sep ? *daemon->csv_sep : 0;
1411
1412 return send_cmd(daemon, &cmd);
1413}
1414
1415static int __cmd_signal(struct daemon *daemon, struct option parent_options[],
1416 int argc, const char **argv)
1417{
1418 const char *name = "all";
1419 struct option start_options[] = {
1420 OPT_STRING(0, "session", &name, "session",
1421 "Sent signal to specific session"),
1422 OPT_PARENT(parent_options),
1423 OPT_END()
1424 };
1425 union cmd cmd;
1426
1427 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1428 if (argc)
1429 usage_with_options(daemon_usage, start_options);
1430
1431 if (setup_config(daemon)) {
1432 pr_err("failed: config not found\n");
1433 return -1;
1434 }
1435
1436 memset(&cmd, 0, sizeof(cmd));
1437 cmd.signal.cmd = CMD_SIGNAL;
1438 cmd.signal.sig = SIGUSR2;
1439 strncpy(cmd.signal.name, name, sizeof(cmd.signal.name) - 1);
1440
1441 return send_cmd(daemon, &cmd);
1442}
1443
1444static int __cmd_stop(struct daemon *daemon, struct option parent_options[],
1445 int argc, const char **argv)
1446{
1447 struct option start_options[] = {
1448 OPT_PARENT(parent_options),
1449 OPT_END()
1450 };
1451 union cmd cmd;
1452
1453 argc = parse_options(argc, argv, start_options, daemon_usage, 0);
1454 if (argc)
1455 usage_with_options(daemon_usage, start_options);
1456
1457 if (setup_config(daemon)) {
1458 pr_err("failed: config not found\n");
1459 return -1;
1460 }
1461
1462 memset(&cmd, 0, sizeof(cmd));
1463 cmd.cmd = CMD_STOP;
1464 return send_cmd(daemon, &cmd);
1465}
1466
1467static int __cmd_ping(struct daemon *daemon, struct option parent_options[],
1468 int argc, const char **argv)
1469{
1470 const char *name = "all";
1471 struct option ping_options[] = {
1472 OPT_STRING(0, "session", &name, "session",
1473 "Ping to specific session"),
1474 OPT_PARENT(parent_options),
1475 OPT_END()
1476 };
1477 union cmd cmd;
1478
1479 argc = parse_options(argc, argv, ping_options, daemon_usage, 0);
1480 if (argc)
1481 usage_with_options(daemon_usage, ping_options);
1482
1483 if (setup_config(daemon)) {
1484 pr_err("failed: config not found\n");
1485 return -1;
1486 }
1487
1488 memset(&cmd, 0, sizeof(cmd));
1489 cmd.cmd = CMD_PING;
1490 scnprintf(cmd.ping.name, sizeof(cmd.ping.name), "%s", name);
1491 return send_cmd(daemon, &cmd);
1492}
1493
1494static char *alloc_perf_exe_path(void)
1495{
1496 char path[PATH_MAX];
1497
1498 perf_exe(path, sizeof(path));
1499 return strdup(path);
1500}
1501
1502int cmd_daemon(int argc, const char **argv)
1503{
1504 struct option daemon_options[] = {
1505 OPT_INCR('v', "verbose", &verbose, "be more verbose"),
1506 OPT_STRING(0, "config", &__daemon.config,
1507 "config file", "config file path"),
1508 OPT_STRING(0, "base", &__daemon.base_user,
1509 "directory", "base directory"),
1510 OPT_STRING_OPTARG('x', "field-separator", &__daemon.csv_sep,
1511 "field separator", "print counts with custom separator", ","),
1512 OPT_END()
1513 };
1514 int ret = -1;
1515
1516 __daemon.perf = alloc_perf_exe_path();
1517 if (!__daemon.perf)
1518 return -ENOMEM;
1519
1520 __daemon.out = stdout;
1521
1522 argc = parse_options(argc, argv, daemon_options, daemon_usage,
1523 PARSE_OPT_STOP_AT_NON_OPTION);
1524
1525 if (argc) {
1526 if (!strcmp(argv[0], "start"))
1527 ret = __cmd_start(&__daemon, daemon_options, argc, argv);
1528 else if (!strcmp(argv[0], "signal"))
1529 ret = __cmd_signal(&__daemon, daemon_options, argc, argv);
1530 else if (!strcmp(argv[0], "stop"))
1531 ret = __cmd_stop(&__daemon, daemon_options, argc, argv);
1532 else if (!strcmp(argv[0], "ping"))
1533 ret = __cmd_ping(&__daemon, daemon_options, argc, argv);
1534 else
1535 pr_err("failed: unknown command '%s'\n", argv[0]);
1536 } else {
1537 ret = setup_config(&__daemon);
1538 if (ret)
1539 pr_err("failed: config not found\n");
1540 else
1541 ret = send_cmd_list(&__daemon);
1542 }
1543 zfree(&__daemon.perf);
1544 return ret;
1545}