/* * wee-signal.c - signal functions * * Copyright (C) 2021-2023 Sébastien Helleu * * This file is part of WeeChat, the extensible chat client. * * WeeChat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * WeeChat is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with WeeChat. If not, see . */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "weechat.h" #include "wee-signal.h" #include "wee-config.h" #include "wee-debug.h" #include "wee-eval.h" #include "wee-hook.h" #include "wee-input.h" #include "wee-log.h" #include "wee-string.h" #include "../gui/gui-buffer.h" #include "../plugins/plugin.h" struct t_signal signal_list[] = { { SIGHUP, "hup" }, { SIGINT, "int" }, { SIGQUIT, "quit" }, { SIGKILL, "kill" }, { SIGTERM, "term" }, { SIGUSR1, "usr1" }, { SIGUSR2, "usr2" }, { 0, NULL }, }; volatile sig_atomic_t signal_sighup_count = 0; volatile sig_atomic_t signal_sigquit_count = 0; volatile sig_atomic_t signal_sigterm_count = 0; volatile sig_atomic_t signal_sigusr1_count = 0; volatile sig_atomic_t signal_sigusr2_count = 0; /* * Callback for system signal SIGHUP. */ void signal_sighup_cb () { signal_sighup_count++; } /* * Callback for system signal SIGQUIT. */ void signal_sigquit_cb () { signal_sigquit_count++; } /* * Callback for system signal SIGTERM. */ void signal_sigterm_cb () { signal_sigterm_count++; } /* * Callback for system signal SIGUSR1. */ void signal_sigusr1_cb () { signal_sigusr1_count++; } /* * Callback for system signal SIGUSR2. */ void signal_sigusr2_cb () { signal_sigusr2_count++; } /* * Gets a signal index with a signal number; only some commonly used signal * names are supported here (see declaration of signal_list[]). * * Returns the index of signal in structure string_signal, -1 if not found. */ int signal_search_number (int signal_number) { int i; for (i = 0; signal_list[i].name; i++) { if (signal_list[i].signal == signal_number) return i; } /* signal not found */ return -1; } /* * Gets a signal number with a name; only some commonly used signal names are * supported here (see declaration of signal_list[]). * * Returns the signal number, -1 if not found. */ int signal_search_name (const char *name) { int i; if (!name) return -1; for (i = 0; signal_list[i].name; i++) { if (string_strcasecmp (signal_list[i].name, name) == 0) return signal_list[i].signal; } /* signal not found */ return -1; } /* * Catches a system signal. */ void signal_catch (int signum, void (*handler)(int)) { struct sigaction act; sigemptyset (&act.sa_mask); act.sa_flags = 0; act.sa_handler = handler; sigaction (signum, &act, NULL); } /* * Sends a WeeChat signal on a system signal received. * * Returns: * WEECHAT_RC_OK: the WeeChat handler must be executed * WEECHAT_RC_OK_EAT: signal eaten, the WeeChat handler must NOT be executed */ int signal_send_to_weechat (int signal_index) { int rc; char str_signal[32]; if (signal_index < 0) return WEECHAT_RC_OK; snprintf (str_signal, sizeof (str_signal), "signal_sig%s", signal_list[signal_index].name); rc = hook_signal_send (str_signal, WEECHAT_HOOK_SIGNAL_STRING, NULL); return (rc == WEECHAT_RC_OK_EAT) ? WEECHAT_RC_OK_EAT : WEECHAT_RC_OK; } /* * Evaluates and executes the command bound to a signal. */ void signal_exec_command (int signal_index, const char *command) { char str_signal[32], *signal_upper, **commands, **ptr_command; char *command_eval; if (!command || !command[0]) return; snprintf (str_signal, sizeof (str_signal), "sig%s", signal_list[signal_index].name); commands = string_split_command (command, ';'); if (commands) { for (ptr_command = commands; *ptr_command; ptr_command++) { command_eval = eval_expression (*ptr_command, NULL, NULL, NULL); if (command_eval) { signal_upper = string_toupper (str_signal); log_printf ("Signal %s received, executing command: \"%s\"", (signal_upper) ? signal_upper : str_signal, command_eval); if (signal_upper) free (signal_upper); (void) input_data (gui_buffer_search_main (), command_eval, NULL, 0); free (command_eval); } } string_free_split_command (commands); } } /* * Handles a specific signal received: */ void signal_handle_number (int signal_number, int count, const char *command) { int i, signal_index, rc; if (count == 0) return; signal_index = signal_search_number (signal_number); if (signal_index < 0) return; for (i = 0; i < count; i++) { rc = signal_send_to_weechat (signal_index); if (rc == WEECHAT_RC_OK_EAT) continue; signal_exec_command (signal_index, command); } } /* * Handles signals received: sends WeeChat signal and executes the configured * command (is signal not eaten). */ void signal_handle () { /* SIGUSR1 */ signal_handle_number (SIGUSR1, signal_sigusr1_count, CONFIG_STRING(config_signal_sigusr1)); signal_sigusr1_count = 0; /* SIGUSR2 */ signal_handle_number (SIGUSR2, signal_sigusr2_count, CONFIG_STRING(config_signal_sigusr2)); signal_sigusr2_count = 0; /* SIGHUP */ signal_handle_number (SIGHUP, signal_sighup_count, CONFIG_STRING(config_signal_sighup)); signal_sighup_count = 0; /* SIGQUIT */ signal_handle_number (SIGQUIT, signal_sigquit_count, CONFIG_STRING(config_signal_sigquit)); signal_sigquit_count = 0; /* SIGTERM */ signal_handle_number (SIGTERM, signal_sigterm_count, CONFIG_STRING(config_signal_sigterm)); signal_sigterm_count = 0; } /* * Initializes signal. */ void signal_init () { /* ignore some signals */ signal_catch (SIGINT, SIG_IGN); signal_catch (SIGPIPE, SIG_IGN); /* catch signals that can be customized */ signal_catch (SIGHUP, &signal_sighup_cb); signal_catch (SIGQUIT, &signal_sigquit_cb); signal_catch (SIGTERM, &signal_sigterm_cb); signal_catch (SIGUSR1, &signal_sigusr1_cb); signal_catch (SIGUSR2, &signal_sigusr2_cb); /* in case of crash (oh no!) */ signal_catch (SIGSEGV, &debug_sigsegv_cb); }