diff options
Diffstat (limited to 'src/signals.c')
| -rw-r--r-- | src/signals.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/src/signals.c b/src/signals.c deleted file mode 100644 index 331e8035..00000000 --- a/src/signals.c +++ /dev/null @@ -1,168 +0,0 @@ -#include "common.h" - -typedef enum signal_action { - NETDATA_SIGNAL_END_OF_LIST, - NETDATA_SIGNAL_IGNORE, - NETDATA_SIGNAL_EXIT_CLEANLY, - NETDATA_SIGNAL_SAVE_DATABASE, - NETDATA_SIGNAL_LOG_ROTATE, - NETDATA_SIGNAL_RELOAD_HEALTH, - NETDATA_SIGNAL_FATAL, -} SIGNAL_ACTION; - -static struct { - int signo; // the signal - const char *name; // the name of the signal - size_t count; // the number of signals received - SIGNAL_ACTION action; // the action to take -} signals_waiting[] = { - { SIGPIPE, "SIGPIPE", 0, NETDATA_SIGNAL_IGNORE }, - { SIGINT , "SIGINT", 0, NETDATA_SIGNAL_EXIT_CLEANLY }, - { SIGQUIT, "SIGQUIT", 0, NETDATA_SIGNAL_EXIT_CLEANLY }, - { SIGTERM, "SIGTERM", 0, NETDATA_SIGNAL_EXIT_CLEANLY }, - { SIGHUP, "SIGHUP", 0, NETDATA_SIGNAL_LOG_ROTATE }, - { SIGUSR1, "SIGUSR1", 0, NETDATA_SIGNAL_SAVE_DATABASE }, - { SIGUSR2, "SIGUSR2", 0, NETDATA_SIGNAL_RELOAD_HEALTH }, - { SIGBUS, "SIGBUS", 0, NETDATA_SIGNAL_FATAL }, - - // terminator - { 0, "NONE", 0, NETDATA_SIGNAL_END_OF_LIST } -}; - -static void signal_handler(int signo) { - // find the entry in the list - int i; - for(i = 0; signals_waiting[i].action != NETDATA_SIGNAL_END_OF_LIST ; i++) { - if(unlikely(signals_waiting[i].signo == signo)) { - signals_waiting[i].count++; - - if(signals_waiting[i].action == NETDATA_SIGNAL_FATAL) { - char buffer[200 + 1]; - snprintfz(buffer, 200, "\nSIGNAL HANLDER: received: %s. Oops! This is bad!\n", signals_waiting[i].name); - if(write(STDERR_FILENO, buffer, strlen(buffer)) == -1) { - // nothing to do - we cannot write but there is no way to complaint about it - ; - } - } - - return; - } - } -} - -void signals_block(void) { - sigset_t sigset; - sigfillset(&sigset); - - if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) - error("SIGNAL: Could not block signals for threads"); -} - -void signals_unblock(void) { - sigset_t sigset; - sigfillset(&sigset); - - if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) { - error("SIGNAL: Could not unblock signals for threads"); - } -} - -void signals_init(void) { - // Catch signals which we want to use - struct sigaction sa; - sa.sa_flags = 0; - - // ignore all signals while we run in a signal handler - sigfillset(&sa.sa_mask); - - int i; - for (i = 0; signals_waiting[i].action != NETDATA_SIGNAL_END_OF_LIST; i++) { - if(signals_waiting[i].action == NETDATA_SIGNAL_IGNORE) - sa.sa_handler = SIG_IGN; - else - sa.sa_handler = signal_handler; - - if(sigaction(signals_waiting[i].signo, &sa, NULL) == -1) - error("SIGNAL: Failed to change signal handler for: %s", signals_waiting[i].name); - } -} - -void signals_reset(void) { - struct sigaction sa; - sigemptyset(&sa.sa_mask); - sa.sa_handler = SIG_DFL; - sa.sa_flags = 0; - - int i; - for (i = 0; signals_waiting[i].action != NETDATA_SIGNAL_END_OF_LIST; i++) { - if(sigaction(signals_waiting[i].signo, &sa, NULL) == -1) - error("SIGNAL: Failed to reset signal handler for: %s", signals_waiting[i].name); - } -} - -void signals_handle(void) { - while(1) { - - // pause() causes the calling process (or thread) to sleep until a signal - // is delivered that either terminates the process or causes the invocation - // of a signal-catching function. - if(pause() == -1 && errno == EINTR) { - - // loop once, but keep looping while signals are coming in - // this is needed because a few operations may take some time - // so we need to check for new signals before pausing again - int found = 1; - while(found) { - found = 0; - - // execute the actions of the signals - int i; - for (i = 0; signals_waiting[i].action != NETDATA_SIGNAL_END_OF_LIST; i++) { - if (signals_waiting[i].count) { - found = 1; - signals_waiting[i].count = 0; - const char *name = signals_waiting[i].name; - - switch (signals_waiting[i].action) { - case NETDATA_SIGNAL_RELOAD_HEALTH: - error_log_limit_unlimited(); - info("SIGNAL: Received %s. Reloading HEALTH configuration...", name); - health_reload(); - error_log_limit_reset(); - break; - - case NETDATA_SIGNAL_SAVE_DATABASE: - error_log_limit_unlimited(); - info("SIGNAL: Received %s. Saving databases...", name); - rrdhost_save_all(); - info("Databases saved."); - error_log_limit_reset(); - break; - - case NETDATA_SIGNAL_LOG_ROTATE: - error_log_limit_unlimited(); - info("SIGNAL: Received %s. Reopening all log files...", name); - reopen_all_log_files(); - error_log_limit_reset(); - break; - - case NETDATA_SIGNAL_EXIT_CLEANLY: - info("SIGNAL: Received %s. Cleaning up to exit...", name); - netdata_cleanup_and_exit(0); - exit(0); - - case NETDATA_SIGNAL_FATAL: - fatal("SIGNAL: Received %s. netdata now exits.", name); - - default: - info("SIGNAL: Received %s. No signal handler configured. Ignoring it.", name); - break; - } - } - } - } - } - else - error("SIGNAL: pause() returned but it was not interrupted by a signal."); - } -} |