2 functions to track and manage processes
4 Copyright (C) Ronnie Sahlberg 2012
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "system/wait.h"
22 #include "../include/ctdb_client.h"
23 #include "../include/ctdb_private.h"
24 #include "../common/rb_tree.h"
26 static bool is_child = false;
28 void ctdb_set_child_info(TALLOC_CTX *mem_ctx, const char *child_name_fmt, ...)
31 if (child_name_fmt != NULL) {
35 va_start(ap, child_name_fmt);
36 t = talloc_vasprintf(mem_ctx, child_name_fmt, ap);
37 debug_extra = talloc_asprintf(mem_ctx, "%s:", t);
43 bool ctdb_is_child_process(void)
49 * This function forks a child process and drops the realtime
50 * scheduler for the child process.
52 pid_t ctdb_fork_no_free_ringbuffer(struct ctdb_context *ctdb)
62 ctdb_set_child_info(ctdb, NULL);
64 /* Close the Unix Domain socket and the TCP socket.
65 * This ensures that none of the child processes will
66 * look like the main daemon when it is not running.
67 * tevent needs to be stopped before closing sockets.
69 if (ctdb->ev != NULL) {
70 talloc_free(ctdb->ev);
73 if (ctdb->daemon.sd != -1) {
74 close(ctdb->daemon.sd);
77 if (ctdb->methods != NULL) {
78 ctdb->methods->shutdown(ctdb);
81 /* The child does not need to be realtime */
82 if (ctdb->do_setsched) {
83 ctdb_restore_scheduler(ctdb);
85 ctdb->can_send_controls = false;
90 if (getpid() != ctdb->ctdbd_pid) {
94 process = talloc_asprintf(ctdb->child_processes, "process:%d", (int)pid);
95 trbt_insert32(ctdb->child_processes, pid, process);
100 pid_t ctdb_fork(struct ctdb_context *ctdb)
104 pid = ctdb_fork_no_free_ringbuffer(ctdb);
106 ctdb_log_ringbuffer_free();
113 static void ctdb_sigchld_handler(struct tevent_context *ev,
114 struct tevent_signal *te, int signum, int count,
118 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
123 pid = waitpid(-1, &status, WNOHANG);
125 DEBUG(DEBUG_ERR, (__location__ " waitpid() returned error. errno:%d\n", errno));
131 if (getpid() != ctdb->ctdbd_pid) {
135 process = trbt_lookup32(ctdb->child_processes, pid);
136 if (process == NULL) {
137 DEBUG(DEBUG_ERR,("Got SIGCHLD from pid:%d we didn not spawn with ctdb_fork\n", pid));
140 DEBUG(DEBUG_DEBUG, ("SIGCHLD from %d %s\n", (int)pid, process));
141 talloc_free(process);
147 struct tevent_signal *
148 ctdb_init_sigchld(struct ctdb_context *ctdb)
150 struct tevent_signal *se;
152 ctdb->child_processes = trbt_create(ctdb, 0);
154 se = tevent_add_signal(ctdb->ev, ctdb, SIGCHLD, 0, ctdb_sigchld_handler, ctdb);
159 ctdb_kill(struct ctdb_context *ctdb, pid_t pid, int signum)
164 return kill(pid, signum);
167 if (getpid() != ctdb->ctdbd_pid) {
168 return kill(pid, signum);
171 process = trbt_lookup32(ctdb->child_processes, pid);
172 if (process == NULL) {
173 DEBUG(DEBUG_ERR,("ctdb_kill: trying to kill(%d, %d) a process that does not exist\n", pid, signum));
177 return kill(pid, signum);