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 void ctdb_set_child_info(TALLOC_CTX *mem_ctx, const char *child_name_fmt, ...)
28 if (child_name_fmt != NULL) {
32 va_start(ap, child_name_fmt);
33 t = talloc_vasprintf(mem_ctx, child_name_fmt, ap);
34 debug_extra = talloc_asprintf(mem_ctx, "%s:", t);
40 void ctdb_track_child(struct ctdb_context *ctdb, pid_t pid)
44 /* Only CTDB main daemon should track child processes */
45 if (getpid() != ctdb->ctdbd_pid) {
49 process = talloc_asprintf(ctdb->child_processes, "process:%d", (int)pid);
50 trbt_insert32(ctdb->child_processes, pid, process);
54 * This function forks a child process and drops the realtime
55 * scheduler for the child process.
57 pid_t ctdb_fork(struct ctdb_context *ctdb)
66 ctdb_set_child_info(ctdb, NULL);
68 /* Close the Unix Domain socket and the TCP socket.
69 * This ensures that none of the child processes will
70 * look like the main daemon when it is not running.
71 * tevent needs to be stopped before closing sockets.
73 if (ctdb->ev != NULL) {
74 talloc_free(ctdb->ev);
77 if (ctdb->daemon.sd != -1) {
78 close(ctdb->daemon.sd);
81 if (ctdb->methods != NULL) {
82 ctdb->methods->shutdown(ctdb);
85 /* The child does not need to be realtime */
86 if (ctdb->do_setsched) {
89 ctdb->can_send_controls = false;
94 ctdb_track_child(ctdb, pid);
98 static void ctdb_sigchld_handler(struct tevent_context *ev,
99 struct tevent_signal *te, int signum, int count,
103 struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
108 pid = waitpid(-1, &status, WNOHANG);
110 DEBUG(DEBUG_ERR, (__location__ " waitpid() returned error. errno:%d\n", errno));
116 if (getpid() != ctdb->ctdbd_pid) {
120 process = trbt_lookup32(ctdb->child_processes, pid);
121 if (process == NULL) {
122 DEBUG(DEBUG_ERR,("Got SIGCHLD from pid:%d we didn not spawn with ctdb_fork\n", pid));
125 DEBUG(DEBUG_DEBUG, ("SIGCHLD from %d %s\n", (int)pid, process));
126 talloc_free(process);
132 struct tevent_signal *
133 ctdb_init_sigchld(struct ctdb_context *ctdb)
135 struct tevent_signal *se;
137 ctdb->child_processes = trbt_create(ctdb, 0);
139 se = tevent_add_signal(ctdb->ev, ctdb, SIGCHLD, 0, ctdb_sigchld_handler, ctdb);
144 ctdb_kill(struct ctdb_context *ctdb, pid_t pid, int signum)
149 return kill(pid, signum);
152 if (getpid() != ctdb->ctdbd_pid) {
153 return kill(pid, signum);
156 process = trbt_lookup32(ctdb->child_processes, pid);
157 if (process == NULL) {
158 DEBUG(DEBUG_ERR,("ctdb_kill: trying to kill(%d, %d) a process that does not exist\n", pid, signum));
162 return kill(pid, signum);