2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
27 #include <sys/types.h>
33 #include "dynamic-string.h"
42 VLOG_DEFINE_THIS_MODULE(vlog);
44 COVERAGE_DEFINE(vlog_recursive);
46 /* ovs_assert() logs the assertion message, so using ovs_assert() in this
47 * source file could cause recursion. */
49 #define ovs_assert use_assert_instead_of_ovs_assert_in_this_module
51 /* Name for each logging level. */
52 static const char *const level_names[VLL_N_LEVELS] = {
53 #define VLOG_LEVEL(NAME, SYSLOG_LEVEL) #NAME,
58 /* Syslog value for each logging level. */
59 static const int syslog_levels[VLL_N_LEVELS] = {
60 #define VLOG_LEVEL(NAME, SYSLOG_LEVEL) SYSLOG_LEVEL,
65 /* The log modules. */
66 #if USE_LINKER_SECTIONS
67 extern struct vlog_module *__start_vlog_modules[];
68 extern struct vlog_module *__stop_vlog_modules[];
69 #define vlog_modules __start_vlog_modules
70 #define n_vlog_modules (__stop_vlog_modules - __start_vlog_modules)
72 #define VLOG_MODULE VLOG_DEFINE_MODULE__
73 #include "vlog-modules.def"
76 struct vlog_module *vlog_modules[] = {
77 #define VLOG_MODULE(NAME) &VLM_##NAME,
78 #include "vlog-modules.def"
81 #define n_vlog_modules ARRAY_SIZE(vlog_modules)
84 /* Information about each facility. */
86 const char *name; /* Name. */
87 char *pattern; /* Current pattern. */
88 bool default_pattern; /* Whether current pattern is the default. */
90 static struct facility facilities[VLF_N_FACILITIES] = {
91 #define VLOG_FACILITY(NAME, PATTERN) {#NAME, PATTERN, true},
96 /* VLF_FILE configuration. */
97 static char *log_file_name;
98 static int log_fd = -1;
100 /* vlog initialized? */
101 static bool vlog_inited;
103 static void format_log_message(const struct vlog_module *, enum vlog_level,
104 enum vlog_facility, unsigned int msg_num,
105 const char *message, va_list, struct ds *)
107 static void vlog_write_file(struct ds *);
108 static void vlog_update_async_log_fd(void);
110 /* Searches the 'n_names' in 'names'. Returns the index of a match for
111 * 'target', or 'n_names' if no name matches. */
113 search_name_array(const char *target, const char *const *names, size_t n_names)
117 for (i = 0; i < n_names; i++) {
119 if (!strcasecmp(names[i], target)) {
126 /* Returns the name for logging level 'level'. */
128 vlog_get_level_name(enum vlog_level level)
130 assert(level < VLL_N_LEVELS);
131 return level_names[level];
134 /* Returns the logging level with the given 'name', or VLL_N_LEVELS if 'name'
135 * is not the name of a logging level. */
137 vlog_get_level_val(const char *name)
139 return search_name_array(name, level_names, ARRAY_SIZE(level_names));
142 /* Returns the name for logging facility 'facility'. */
144 vlog_get_facility_name(enum vlog_facility facility)
146 assert(facility < VLF_N_FACILITIES);
147 return facilities[facility].name;
150 /* Returns the logging facility named 'name', or VLF_N_FACILITIES if 'name' is
151 * not the name of a logging facility. */
153 vlog_get_facility_val(const char *name)
157 for (i = 0; i < VLF_N_FACILITIES; i++) {
158 if (!strcasecmp(facilities[i].name, name)) {
165 /* Returns the name for logging module 'module'. */
167 vlog_get_module_name(const struct vlog_module *module)
172 /* Returns the logging module named 'name', or NULL if 'name' is not the name
173 * of a logging module. */
175 vlog_module_from_name(const char *name)
177 struct vlog_module **mp;
179 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
180 if (!strcasecmp(name, (*mp)->name)) {
187 /* Returns the current logging level for the given 'module' and 'facility'. */
189 vlog_get_level(const struct vlog_module *module, enum vlog_facility facility)
191 assert(facility < VLF_N_FACILITIES);
192 return module->levels[facility];
196 update_min_level(struct vlog_module *module)
198 enum vlog_facility facility;
200 module->min_level = VLL_OFF;
201 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
202 if (log_fd >= 0 || facility != VLF_FILE) {
203 enum vlog_level level = module->levels[facility];
204 if (level > module->min_level) {
205 module->min_level = level;
212 set_facility_level(enum vlog_facility facility, struct vlog_module *module,
213 enum vlog_level level)
215 assert(facility >= 0 && facility < VLF_N_FACILITIES);
216 assert(level < VLL_N_LEVELS);
219 struct vlog_module **mp;
221 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
222 (*mp)->levels[facility] = level;
223 update_min_level(*mp);
226 module->levels[facility] = level;
227 update_min_level(module);
231 /* Sets the logging level for the given 'module' and 'facility' to 'level'. A
232 * null 'module' or a 'facility' of VLF_ANY_FACILITY is treated as a wildcard
233 * across all modules or facilities, respectively. */
235 vlog_set_levels(struct vlog_module *module, enum vlog_facility facility,
236 enum vlog_level level)
238 assert(facility < VLF_N_FACILITIES || facility == VLF_ANY_FACILITY);
239 if (facility == VLF_ANY_FACILITY) {
240 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
241 set_facility_level(facility, module, level);
244 set_facility_level(facility, module, level);
249 do_set_pattern(enum vlog_facility facility, const char *pattern)
251 struct facility *f = &facilities[facility];
252 if (!f->default_pattern) {
255 f->default_pattern = false;
257 f->pattern = xstrdup(pattern);
260 /* Sets the pattern for the given 'facility' to 'pattern'. */
262 vlog_set_pattern(enum vlog_facility facility, const char *pattern)
264 assert(facility < VLF_N_FACILITIES || facility == VLF_ANY_FACILITY);
265 if (facility == VLF_ANY_FACILITY) {
266 for (facility = 0; facility < VLF_N_FACILITIES; facility++) {
267 do_set_pattern(facility, pattern);
270 do_set_pattern(facility, pattern);
274 /* Returns the name of the log file used by VLF_FILE, or a null pointer if no
275 * log file has been set. (A non-null return value does not assert that the
276 * named log file is in use: if vlog_set_log_file() or vlog_reopen_log_file()
277 * fails, it still sets the log file name.) */
279 vlog_get_log_file(void)
281 return log_file_name;
284 /* Sets the name of the log file used by VLF_FILE to 'file_name', or to the
285 * default file name if 'file_name' is null. Returns 0 if successful,
286 * otherwise a positive errno value. */
288 vlog_set_log_file(const char *file_name)
290 char *old_log_file_name;
291 struct vlog_module **mp;
294 /* Close old log file. */
296 VLOG_INFO("closing log file");
301 /* Update log file name and free old name. The ordering is important
302 * because 'file_name' might be 'log_file_name' or some suffix of it. */
303 old_log_file_name = log_file_name;
304 log_file_name = (file_name
306 : xasprintf("%s/%s.log", ovs_logdir(), program_name));
307 free(old_log_file_name);
308 file_name = NULL; /* Might have been freed. */
310 /* Open new log file and update min_levels[] to reflect whether we actually
311 * have a log_file. */
312 log_fd = open(log_file_name, O_WRONLY | O_CREAT | O_APPEND, 0666);
314 vlog_update_async_log_fd();
316 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
317 update_min_level(*mp);
320 /* Log success or failure. */
322 VLOG_WARN("failed to open %s for logging: %s",
323 log_file_name, strerror(errno));
326 VLOG_INFO("opened log file %s", log_file_name);
333 /* Closes and then attempts to re-open the current log file. (This is useful
334 * just after log rotation, to ensure that the new log file starts being used.)
335 * Returns 0 if successful, otherwise a positive errno value. */
337 vlog_reopen_log_file(void)
339 struct stat old, new;
341 /* Skip re-opening if there's nothing to reopen. */
342 if (!log_file_name) {
346 /* Skip re-opening if it would be a no-op because the old and new files are
347 * the same. (This avoids writing "closing log file" followed immediately
348 * by "opened log file".) */
350 && !fstat(log_fd, &old)
351 && !stat(log_file_name, &new)
352 && old.st_dev == new.st_dev
353 && old.st_ino == new.st_ino) {
357 return vlog_set_log_file(log_file_name);
360 /* Set debugging levels. Returns null if successful, otherwise an error
361 * message that the caller must free(). */
363 vlog_set_levels_from_string(const char *s_)
365 char *s = xstrdup(s_);
366 char *save_ptr = NULL;
370 word = strtok_r(s, " ,:\t", &save_ptr);
371 if (word && !strcasecmp(word, "PATTERN")) {
372 enum vlog_facility facility;
374 word = strtok_r(NULL, " ,:\t", &save_ptr);
376 msg = xstrdup("missing facility");
380 facility = (!strcasecmp(word, "ANY")
382 : vlog_get_facility_val(word));
383 if (facility == VLF_N_FACILITIES) {
384 msg = xasprintf("unknown facility \"%s\"", word);
387 vlog_set_pattern(facility, save_ptr);
389 struct vlog_module *module = NULL;
390 enum vlog_level level = VLL_N_LEVELS;
391 enum vlog_facility facility = VLF_N_FACILITIES;
393 for (; word != NULL; word = strtok_r(NULL, " ,:\t", &save_ptr)) {
394 if (!strcasecmp(word, "ANY")) {
396 } else if (vlog_get_facility_val(word) != VLF_N_FACILITIES) {
397 if (facility != VLF_N_FACILITIES) {
398 msg = xstrdup("cannot specify multiple facilities");
401 facility = vlog_get_facility_val(word);
402 } else if (vlog_get_level_val(word) != VLL_N_LEVELS) {
403 if (level != VLL_N_LEVELS) {
404 msg = xstrdup("cannot specify multiple levels");
407 level = vlog_get_level_val(word);
408 } else if (vlog_module_from_name(word)) {
410 msg = xstrdup("cannot specify multiple modules");
413 module = vlog_module_from_name(word);
415 msg = xasprintf("no facility, level, or module \"%s\"", word);
420 if (facility == VLF_N_FACILITIES) {
421 facility = VLF_ANY_FACILITY;
423 if (level == VLL_N_LEVELS) {
426 vlog_set_levels(module, facility, level);
434 /* Set debugging levels. Abort with an error message if 's' is invalid. */
436 vlog_set_levels_from_string_assert(const char *s)
438 char *error = vlog_set_levels_from_string(s);
440 ovs_fatal(0, "%s", error);
444 /* If 'arg' is null, configure maximum verbosity. Otherwise, sets
445 * configuration according to 'arg' (see vlog_set_levels_from_string()). */
447 vlog_set_verbosity(const char *arg)
450 char *msg = vlog_set_levels_from_string(arg);
452 ovs_fatal(0, "processing \"%s\": %s", arg, msg);
455 vlog_set_levels(NULL, VLF_ANY_FACILITY, VLL_DBG);
460 vlog_unixctl_set(struct unixctl_conn *conn, int argc, const char *argv[],
461 void *aux OVS_UNUSED)
465 for (i = 1; i < argc; i++) {
466 char *msg = vlog_set_levels_from_string(argv[i]);
468 unixctl_command_reply_error(conn, msg);
473 unixctl_command_reply(conn, NULL);
477 vlog_unixctl_list(struct unixctl_conn *conn, int argc OVS_UNUSED,
478 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
480 char *msg = vlog_get_levels();
481 unixctl_command_reply(conn, msg);
486 vlog_unixctl_reopen(struct unixctl_conn *conn, int argc OVS_UNUSED,
487 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
490 int error = vlog_reopen_log_file();
492 unixctl_command_reply_error(conn, strerror(errno));
494 unixctl_command_reply(conn, NULL);
497 unixctl_command_reply_error(conn, "Logging to file not configured");
502 set_all_rate_limits(bool enable)
504 struct vlog_module **mp;
506 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
507 (*mp)->honor_rate_limits = enable;
512 set_rate_limits(struct unixctl_conn *conn, int argc,
513 const char *argv[], bool enable)
518 for (i = 1; i < argc; i++) {
519 if (!strcasecmp(argv[i], "ANY")) {
520 set_all_rate_limits(enable);
522 struct vlog_module *module = vlog_module_from_name(argv[i]);
524 unixctl_command_reply_error(conn, "unknown module");
527 module->honor_rate_limits = enable;
531 set_all_rate_limits(enable);
533 unixctl_command_reply(conn, NULL);
537 vlog_enable_rate_limit(struct unixctl_conn *conn, int argc,
538 const char *argv[], void *aux OVS_UNUSED)
540 set_rate_limits(conn, argc, argv, true);
544 vlog_disable_rate_limit(struct unixctl_conn *conn, int argc,
545 const char *argv[], void *aux OVS_UNUSED)
547 set_rate_limits(conn, argc, argv, false);
550 /* Initializes the logging subsystem and registers its unixctl server
555 static char *program_name_copy;
563 /* openlog() is allowed to keep the pointer passed in, without making a
564 * copy. The daemonize code sometimes frees and replaces 'program_name',
565 * so make a private copy just for openlog(). (We keep a pointer to the
566 * private copy to suppress memory leak warnings in case openlog() does
567 * make its own copy.) */
568 program_name_copy = program_name ? xstrdup(program_name) : NULL;
569 openlog(program_name_copy, LOG_NDELAY, LOG_DAEMON);
573 char *s = xastrftime("%a, %d %b %Y %H:%M:%S", now, true);
574 VLOG_ERR("current time is negative: %s (%ld)", s, (long int) now);
578 unixctl_command_register(
579 "vlog/set", "{spec | PATTERN:facility:pattern}",
580 1, INT_MAX, vlog_unixctl_set, NULL);
581 unixctl_command_register("vlog/list", "", 0, 0, vlog_unixctl_list, NULL);
582 unixctl_command_register("vlog/enable-rate-limit", "[module]...",
583 0, INT_MAX, vlog_enable_rate_limit, NULL);
584 unixctl_command_register("vlog/disable-rate-limit", "[module]...",
585 0, INT_MAX, vlog_disable_rate_limit, NULL);
586 unixctl_command_register("vlog/reopen", "", 0, 0,
587 vlog_unixctl_reopen, NULL);
590 /* Closes the logging subsystem. */
600 /* Print the current logging level for each module. */
602 vlog_get_levels(void)
604 struct ds s = DS_EMPTY_INITIALIZER;
605 struct vlog_module **mp;
606 struct svec lines = SVEC_EMPTY_INITIALIZER;
610 ds_put_format(&s, " console syslog file\n");
611 ds_put_format(&s, " ------- ------ ------\n");
613 for (mp = vlog_modules; mp < &vlog_modules[n_vlog_modules]; mp++) {
617 ds_put_format(&line, "%-16s %4s %4s %4s",
618 vlog_get_module_name(*mp),
619 vlog_get_level_name(vlog_get_level(*mp, VLF_CONSOLE)),
620 vlog_get_level_name(vlog_get_level(*mp, VLF_SYSLOG)),
621 vlog_get_level_name(vlog_get_level(*mp, VLF_FILE)));
622 if (!(*mp)->honor_rate_limits) {
623 ds_put_cstr(&line, " (rate limiting disabled)");
625 ds_put_char(&line, '\n');
627 svec_add_nocopy(&lines, ds_steal_cstr(&line));
631 SVEC_FOR_EACH (i, line, &lines) {
632 ds_put_cstr(&s, line);
634 svec_destroy(&lines);
639 /* Returns true if a log message emitted for the given 'module' and 'level'
640 * would cause some log output, false if that module and level are completely
643 vlog_is_enabled(const struct vlog_module *module, enum vlog_level level)
645 return module->min_level >= level;
649 fetch_braces(const char *p, const char *def, char *out, size_t out_size)
652 size_t n = strcspn(p + 1, "}");
653 size_t n_copy = MIN(n, out_size - 1);
654 memcpy(out, p + 1, n_copy);
658 ovs_strlcpy(out, def, out_size);
664 format_log_message(const struct vlog_module *module, enum vlog_level level,
665 enum vlog_facility facility, unsigned int msg_num,
666 const char *message, va_list args_, struct ds *s)
673 for (p = facilities[facility].pattern; *p != '\0'; ) {
674 enum { LEFT, RIGHT } justify = RIGHT;
676 size_t length, field, used;
679 ds_put_char(s, *p++);
693 while (isdigit((unsigned char)*p)) {
694 field = (field * 10) + (*p - '0');
701 ds_put_cstr(s, program_name);
704 p = fetch_braces(p, "", tmp, sizeof tmp);
705 ds_put_cstr(s, vlog_get_module_name(module));
708 p = fetch_braces(p, "%Y-%m-%d %H:%M:%S", tmp, sizeof tmp);
709 ds_put_strftime(s, tmp, time_wall(), false);
712 p = fetch_braces(p, "%Y-%m-%d %H:%M:%S", tmp, sizeof tmp);
713 ds_put_strftime(s, tmp, time_wall(), true);
716 /* Format user-supplied log message and trim trailing new-lines. */
718 va_copy(args, args_);
719 ds_put_format_valist(s, message, args);
721 while (s->length > length && s->string[s->length - 1] == '\n') {
726 ds_put_format(s, "%u", msg_num);
729 ds_put_char(s, '\n');
732 ds_put_cstr(s, vlog_get_level_name(level));
735 ds_put_format(s, "%ld", (long int) getpid());
738 ds_put_format(s, "%lld", time_msec() - time_boot_msec());
741 ds_put_cstr(s, subprogram_name[0] ? subprogram_name : "main");
744 if (subprogram_name[0]) {
745 ds_put_format(s, "(%s)", subprogram_name);
749 ds_put_char(s, p[-1]);
752 used = s->length - length;
754 size_t n_pad = field - used;
755 if (justify == RIGHT) {
756 ds_put_uninit(s, n_pad);
757 memmove(&s->string[length + n_pad], &s->string[length], used);
758 memset(&s->string[length], pad, n_pad);
760 ds_put_char_multiple(s, pad, n_pad);
766 /* Writes 'message' to the log at the given 'level' and as coming from the
769 * Guaranteed to preserve errno. */
771 vlog_valist(const struct vlog_module *module, enum vlog_level level,
772 const char *message, va_list args)
774 bool log_to_console = module->levels[VLF_CONSOLE] >= level;
775 bool log_to_syslog = module->levels[VLF_SYSLOG] >= level;
776 bool log_to_file = module->levels[VLF_FILE] >= level && log_fd >= 0;
777 if (log_to_console || log_to_syslog || log_to_file) {
778 int save_errno = errno;
779 static unsigned int msg_num;
785 ds_reserve(&s, 1024);
788 if (log_to_console) {
789 format_log_message(module, level, VLF_CONSOLE, msg_num,
791 ds_put_char(&s, '\n');
792 fputs(ds_cstr(&s), stderr);
796 int syslog_level = syslog_levels[level];
797 char *save_ptr = NULL;
800 format_log_message(module, level, VLF_SYSLOG, msg_num,
802 for (line = strtok_r(s.string, "\n", &save_ptr); line;
803 line = strtok_r(NULL, "\n", &save_ptr)) {
804 syslog(syslog_level, "%s", line);
809 format_log_message(module, level, VLF_FILE, msg_num,
811 ds_put_char(&s, '\n');
821 vlog(const struct vlog_module *module, enum vlog_level level,
822 const char *message, ...)
826 va_start(args, message);
827 vlog_valist(module, level, message, args);
831 /* Logs 'message' to 'module' at maximum verbosity, then exits with a failure
832 * exit code. Always writes the message to stderr, even if the console
833 * facility is disabled.
835 * Choose this function instead of vlog_abort_valist() if the daemon monitoring
836 * facility shouldn't automatically restart the current daemon. */
838 vlog_fatal_valist(const struct vlog_module *module_,
839 const char *message, va_list args)
841 struct vlog_module *module = CONST_CAST(struct vlog_module *, module_);
843 /* Don't log this message to the console to avoid redundancy with the
844 * message written by the later ovs_fatal_valist(). */
845 module->levels[VLF_CONSOLE] = VLL_OFF;
847 vlog_valist(module, VLL_EMER, message, args);
848 ovs_fatal_valist(0, message, args);
851 /* Logs 'message' to 'module' at maximum verbosity, then exits with a failure
852 * exit code. Always writes the message to stderr, even if the console
853 * facility is disabled.
855 * Choose this function instead of vlog_abort() if the daemon monitoring
856 * facility shouldn't automatically restart the current daemon. */
858 vlog_fatal(const struct vlog_module *module, const char *message, ...)
862 va_start(args, message);
863 vlog_fatal_valist(module, message, args);
867 /* Logs 'message' to 'module' at maximum verbosity, then calls abort(). Always
868 * writes the message to stderr, even if the console facility is disabled.
870 * Choose this function instead of vlog_fatal_valist() if the daemon monitoring
871 * facility should automatically restart the current daemon. */
873 vlog_abort_valist(const struct vlog_module *module_,
874 const char *message, va_list args)
876 struct vlog_module *module = (struct vlog_module *) module_;
878 /* Don't log this message to the console to avoid redundancy with the
879 * message written by the later ovs_abort_valist(). */
880 module->levels[VLF_CONSOLE] = VLL_OFF;
882 vlog_valist(module, VLL_EMER, message, args);
883 ovs_abort_valist(0, message, args);
886 /* Logs 'message' to 'module' at maximum verbosity, then calls abort(). Always
887 * writes the message to stderr, even if the console facility is disabled.
889 * Choose this function instead of vlog_fatal() if the daemon monitoring
890 * facility should automatically restart the current daemon. */
892 vlog_abort(const struct vlog_module *module, const char *message, ...)
896 va_start(args, message);
897 vlog_abort_valist(module, message, args);
902 vlog_should_drop(const struct vlog_module *module, enum vlog_level level,
903 struct vlog_rate_limit *rl)
905 if (!module->honor_rate_limits) {
909 if (!vlog_is_enabled(module, level)) {
913 if (!token_bucket_withdraw(&rl->token_bucket, VLOG_MSG_TOKENS)) {
914 time_t now = time_now();
915 if (!rl->n_dropped) {
916 rl->first_dropped = now;
918 rl->last_dropped = now;
924 time_t now = time_now();
925 unsigned int first_dropped_elapsed = now - rl->first_dropped;
926 unsigned int last_dropped_elapsed = now - rl->last_dropped;
929 "Dropped %u log messages in last %u seconds (most recently, "
930 "%u seconds ago) due to excessive rate",
931 rl->n_dropped, first_dropped_elapsed, last_dropped_elapsed);
939 vlog_rate_limit(const struct vlog_module *module, enum vlog_level level,
940 struct vlog_rate_limit *rl, const char *message, ...)
942 if (!vlog_should_drop(module, level, rl)) {
945 va_start(args, message);
946 vlog_valist(module, level, message, args);
954 printf("\nLogging options:\n"
955 " -v, --verbose=[SPEC] set logging levels\n"
956 " -v, --verbose set maximum verbosity level\n"
957 " --log-file[=FILE] enable logging to specified FILE\n"
958 " (default: %s/%s.log)\n",
959 ovs_logdir(), program_name);
962 static bool vlog_async_inited = false;
964 static worker_request_func vlog_async_write_request_cb;
967 vlog_write_file(struct ds *s)
969 if (worker_is_running()) {
970 static bool in_worker_request = false;
971 if (!in_worker_request) {
972 in_worker_request = true;
974 worker_request(s->string, s->length,
975 &log_fd, vlog_async_inited ? 0 : 1,
976 vlog_async_write_request_cb, NULL, NULL);
977 vlog_async_inited = true;
979 in_worker_request = false;
982 /* We've been entered recursively. This can happen if
983 * worker_request(), or a function that it calls, tries to log
984 * something. We can't call worker_request() recursively, so fall
985 * back to writing the log file directly. */
986 COVERAGE_INC(vlog_recursive);
989 ignore(write(log_fd, s->string, s->length));
993 vlog_update_async_log_fd(void)
995 if (worker_is_running()) {
996 worker_request(NULL, 0, &log_fd, 1, vlog_async_write_request_cb,
998 vlog_async_inited = true;
1003 vlog_async_write_request_cb(struct ofpbuf *request,
1004 const int *fd, size_t n_fds)
1013 if (request->size > 0) {
1014 ignore(write(log_fd, request->data, request->size));