summaryrefslogtreecommitdiffstats
path: root/daemon/signals.c
diff options
context:
space:
mode:
Diffstat (limited to 'daemon/signals.c')
-rw-r--r--daemon/signals.c253
1 files changed, 0 insertions, 253 deletions
diff --git a/daemon/signals.c b/daemon/signals.c
deleted file mode 100644
index 4f2254334..000000000
--- a/daemon/signals.c
+++ /dev/null
@@ -1,253 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-
-#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_REOPEN_LOGS,
- NETDATA_SIGNAL_RELOAD_HEALTH,
- NETDATA_SIGNAL_FATAL,
- NETDATA_SIGNAL_CHILD,
-} 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_REOPEN_LOGS },
- { SIGUSR1, "SIGUSR1", 0, NETDATA_SIGNAL_SAVE_DATABASE },
- { SIGUSR2, "SIGUSR2", 0, NETDATA_SIGNAL_RELOAD_HEALTH },
- { SIGBUS, "SIGBUS", 0, NETDATA_SIGNAL_FATAL },
- { SIGCHLD, "SIGCHLD", 0, NETDATA_SIGNAL_CHILD },
-
- // 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, sizeof(buffer) - 1, "\nSIGNAL HANDLER: 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 complain about it
- ;
- }
- }
-
- return;
- }
- }
-}
-
-void signals_block(void) {
- sigset_t sigset;
- sigfillset(&sigset);
-
- if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1)
- netdata_log_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) {
- netdata_log_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++) {
- switch (signals_waiting[i].action) {
- case NETDATA_SIGNAL_IGNORE:
- sa.sa_handler = SIG_IGN;
- break;
- default:
- sa.sa_handler = signal_handler;
- break;
- }
-
- if(sigaction(signals_waiting[i].signo, &sa, NULL) == -1)
- netdata_log_error("SIGNAL: Failed to change signal handler for: %s", signals_waiting[i].name);
- }
-}
-
-void signals_restore_SIGCHLD(void)
-{
- struct sigaction sa;
-
- sa.sa_flags = 0;
- sigfillset(&sa.sa_mask);
- sa.sa_handler = signal_handler;
-
- if(sigaction(SIGCHLD, &sa, NULL) == -1)
- netdata_log_error("SIGNAL: Failed to change signal handler for: SIGCHLD");
-}
-
-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)
- netdata_log_error("SIGNAL: Failed to reset signal handler for: %s", signals_waiting[i].name);
- }
-}
-
-// reap_child reaps the child identified by pid.
-static void reap_child(pid_t pid) {
- siginfo_t i;
-
- errno = 0;
- netdata_log_debug(D_CHILDS, "SIGNAL: reap_child(%d)...", pid);
- if (netdata_waitid(P_PID, (id_t)pid, &i, WEXITED|WNOHANG) == -1) {
- if (errno != ECHILD)
- netdata_log_error("SIGNAL: waitid(%d): failed to wait for child", pid);
- else
- netdata_log_info("SIGNAL: waitid(%d): failed - it seems the child is already reaped", pid);
- return;
- }
- else if (i.si_pid == 0) {
- // Process didn't exit, this shouldn't happen.
- netdata_log_error("SIGNAL: waitid(%d): reports pid 0 - child has not exited", pid);
- return;
- }
-
- switch (i.si_code) {
- case CLD_EXITED:
- netdata_log_info("SIGNAL: reap_child(%d) exited with code: %d", pid, i.si_status);
- break;
- case CLD_KILLED:
- netdata_log_info("SIGNAL: reap_child(%d) killed by signal: %d", pid, i.si_status);
- break;
- case CLD_DUMPED:
- netdata_log_info("SIGNAL: reap_child(%d) dumped core by signal: %d", pid, i.si_status);
- break;
- case CLD_STOPPED:
- netdata_log_info("SIGNAL: reap_child(%d) stopped by signal: %d", pid, i.si_status);
- break;
- case CLD_TRAPPED:
- netdata_log_info("SIGNAL: reap_child(%d) trapped by signal: %d", pid, i.si_status);
- break;
- case CLD_CONTINUED:
- netdata_log_info("SIGNAL: reap_child(%d) continued by signal: %d", pid, i.si_status);
- break;
- default:
- netdata_log_info("SIGNAL: reap_child(%d) gave us a SIGCHLD with code %d and status %d.", pid, i.si_code, i.si_status);
- break;
- }
-}
-
-// reap_children reaps all pending children which are not managed by myp.
-static void reap_children() {
- siginfo_t i;
-
- while(1) {
- i.si_pid = 0;
- if (netdata_waitid(P_ALL, (id_t)0, &i, WEXITED|WNOHANG|WNOWAIT) == -1 || i.si_pid == 0)
- // nothing to do
- return;
-
- reap_child(i.si_pid);
- }
-}
-
-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:
- nd_log_limits_unlimited();
- netdata_log_info("SIGNAL: Received %s. Reloading HEALTH configuration...", name);
- nd_log_limits_reset();
- execute_command(CMD_RELOAD_HEALTH, NULL, NULL);
- break;
-
- case NETDATA_SIGNAL_SAVE_DATABASE:
- nd_log_limits_unlimited();
- netdata_log_info("SIGNAL: Received %s. Saving databases...", name);
- nd_log_limits_reset();
- execute_command(CMD_SAVE_DATABASE, NULL, NULL);
- break;
-
- case NETDATA_SIGNAL_REOPEN_LOGS:
- nd_log_limits_unlimited();
- netdata_log_info("SIGNAL: Received %s. Reopening all log files...", name);
- nd_log_limits_reset();
- execute_command(CMD_REOPEN_LOGS, NULL, NULL);
- break;
-
- case NETDATA_SIGNAL_EXIT_CLEANLY:
- nd_log_limits_unlimited();
- netdata_log_info("SIGNAL: Received %s. Cleaning up to exit...", name);
- commands_exit();
- netdata_cleanup_and_exit(0);
- exit(0);
- break;
-
- case NETDATA_SIGNAL_FATAL:
- fatal("SIGNAL: Received %s. netdata now exits.", name);
- break;
-
- case NETDATA_SIGNAL_CHILD:
- reap_children();
- break;
-
- default:
- netdata_log_info("SIGNAL: Received %s. No signal handler configured. Ignoring it.", name);
- break;
- }
- }
- }
- }
- }
- else
- netdata_log_error("SIGNAL: pause() returned but it was not interrupted by a signal.");
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-21 10:55:51 +0000