3 const char *program_name = "";
4 unsigned long long debug_flags = DEBUG;
6 int access_log_syslog = 1;
7 int error_log_syslog = 1;
8 int output_log_syslog = 1; // debug log
10 int stdaccess_fd = -1;
11 FILE *stdaccess = NULL;
13 const char *stdaccess_filename = NULL;
14 const char *stderr_filename = NULL;
15 const char *stdout_filename = NULL;
17 void syslog_init(void) {
21 openlog(program_name, LOG_PID, LOG_DAEMON);
26 int open_log_file(int fd, FILE **fp, const char *filename, int *enabled_syslog) {
29 if(!filename || !*filename || !strcmp(filename, "none"))
30 filename = "/dev/null";
32 if(!strcmp(filename, "syslog")) {
33 filename = "/dev/null";
35 if(enabled_syslog) *enabled_syslog = 1;
37 else if(enabled_syslog) *enabled_syslog = 0;
39 // don't do anything if the user is willing
40 // to have the standard one
41 if(!strcmp(filename, "system"))
44 if(!strcmp(filename, "stdout"))
47 else if(!strcmp(filename, "stderr"))
51 f = open(filename, O_WRONLY | O_APPEND | O_CREAT, 0664);
53 error("Cannot open file '%s'. Leaving %d to its default.", filename, fd);
58 // if there is a level-2 file pointer
59 // flush it before switching the level-1 fds
63 if(fd != f && fd != -1) {
64 // it automatically closes
67 error("Cannot dup2() new fd %d to old fd %d for '%s'", f, fd, filename);
71 // info("dup2() new fd %d to old fd %d for '%s'", f, fd, filename);
76 if(fp && *fp == NULL) {
77 // info("fdopen(%d) on filename '%s'", fd, filename);
79 FILE *n = fdopen(fd, "a");
81 error("Cannot fdopen() fd %d ('%s')", fd, filename);
84 if (setvbuf(n, NULL, _IOLBF, 0) != 0)
85 error("Cannot set line buffering on fd %d ('%s')", fd, filename);
100 void reopen_all_log_files() {
102 open_log_file(STDOUT_FILENO, &stdout, stdout_filename, &output_log_syslog);
105 open_log_file(STDERR_FILENO, &stderr, stderr_filename, &error_log_syslog);
107 if(stdaccess_filename)
108 stdaccess_fd = open_log_file(stdaccess_fd, &stdaccess, stdaccess_filename, &access_log_syslog);
111 void open_all_log_files() {
113 open_log_file(STDIN_FILENO, &stdin, "/dev/null", NULL);
115 open_log_file(STDOUT_FILENO, &stdout, stdout_filename, &output_log_syslog);
116 open_log_file(STDERR_FILENO, &stderr, stderr_filename, &error_log_syslog);
117 stdaccess_fd = open_log_file(stdaccess_fd, &stdaccess, stdaccess_filename, &access_log_syslog);
120 // ----------------------------------------------------------------------------
121 // error log throttling
123 time_t error_log_throttle_period = 1200;
124 unsigned long error_log_errors_per_period = 200;
126 int error_log_limit(int reset) {
127 static time_t start = 0;
128 static unsigned long counter = 0, prevented = 0;
130 // do not throttle if the period is 0
131 if(error_log_throttle_period == 0)
134 // prevent all logs if the errors per period is 0
135 if(error_log_errors_per_period == 0)
138 time_t now = time(NULL);
139 if(!start) start = now;
144 fprintf(stderr, "%s: Resetting logging for process '%s' (prevented %lu logs in the last %ld seconds).\n"
157 // detect if we log too much
160 if(now - start > error_log_throttle_period) {
163 fprintf(stderr, "%s: Resuming logging from process '%s' (prevented %lu logs in the last %ld seconds).\n"
167 , error_log_throttle_period
171 // restart the period accounting
180 if(counter > error_log_errors_per_period) {
183 fprintf(stderr, "%s: Too many logs (%lu logs in %ld seconds, threshold is set to %lu logs in %ld seconds). Preventing more logs from process '%s' for %ld seconds.\n"
187 , error_log_errors_per_period
188 , error_log_throttle_period
190 , start + error_log_throttle_period - now);
195 // prevent logging this error
202 // ----------------------------------------------------------------------------
206 // this should print the date in a buffer the way it
207 // is now, logs from multiple threads may be multiplexed
209 void log_date(FILE *out)
213 struct tm *tmp, tmbuf;
216 tmp = localtime_r(&t, &tmbuf);
218 if (tmp == NULL) return;
219 if (unlikely(strftime(outstr, sizeof(outstr), "%y-%m-%d %H:%M:%S", tmp) == 0)) return;
221 fprintf(out, "%s: ", outstr);
224 // ----------------------------------------------------------------------------
227 void debug_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
232 va_start( args, fmt );
233 printf("DEBUG (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
238 if(output_log_syslog) {
239 va_start( args, fmt );
240 vsyslog(LOG_ERR, fmt, args );
247 // ----------------------------------------------------------------------------
250 void info_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
254 // prevent logging too much
255 if(error_log_limit(0)) return;
259 va_start( args, fmt );
260 if(debug_flags) fprintf(stderr, "INFO (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
261 else fprintf(stderr, "INFO: %s: ", program_name);
262 vfprintf( stderr, fmt, args );
267 if(error_log_syslog) {
268 va_start( args, fmt );
269 vsyslog(LOG_INFO, fmt, args );
274 // ----------------------------------------------------------------------------
277 void error_int( const char *prefix, const char *file, const char *function, const unsigned long line, const char *fmt, ... )
281 // prevent logging too much
282 if(error_log_limit(0)) return;
286 va_start( args, fmt );
287 if(debug_flags) fprintf(stderr, "%s (%04lu@%-10.10s:%-15.15s): %s: ", prefix, line, file, function, program_name);
288 else fprintf(stderr, "%s: %s: ", prefix, program_name);
289 vfprintf( stderr, fmt, args );
294 fprintf(stderr, " (errno %d, %s)\n", errno, strerror_r(errno, buf, 1023));
300 if(error_log_syslog) {
301 va_start( args, fmt );
302 vsyslog(LOG_ERR, fmt, args );
307 void fatal_int( const char *file, const char *function, const unsigned long line, const char *fmt, ... )
313 va_start( args, fmt );
314 if(debug_flags) fprintf(stderr, "FATAL (%04lu@%-10.10s:%-15.15s): %s: ", line, file, function, program_name);
315 else fprintf(stderr, "FATAL: %s: ", program_name);
316 vfprintf( stderr, fmt, args );
322 if(error_log_syslog) {
323 va_start( args, fmt );
324 vsyslog(LOG_CRIT, fmt, args );
328 netdata_cleanup_and_exit(1);
331 // ----------------------------------------------------------------------------
334 void log_access( const char *fmt, ... )
341 va_start( args, fmt );
342 vfprintf( stdaccess, fmt, args );
344 fputc('\n', stdaccess);
347 if(access_log_syslog) {
348 va_start( args, fmt );
349 vsyslog(LOG_INFO, fmt, args );