Page MenuHomeClusterLabs Projects
Files F7631709

subsystems.c
No OneTemporary
Actions

subsystems.c
View Options

/*
* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
*
* This program 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 2 of the License, or (at your option) any later version.
*
* This software 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <crm_internal.h>
#include <unistd.h> /* for access */
#include <sys/types.h> /* for calls to open */
#include <sys/stat.h> /* for calls to open */
#include <fcntl.h> /* for calls to open */
#include <pwd.h> /* for getpwuid */
#include <grp.h> /* for initgroups */
#include <errno.h>
#include <sys/wait.h>
#include <sys/time.h> /* for getrlimit */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/resource.h> /* for getrlimit */
#include <crm/crm.h>
#include <crm/msg_xml.h>
#include <crm/common/xml.h>
#include <crm/cib.h>
#include <crmd_fsa.h>
#include <crmd_messages.h>
#include <crmd_callbacks.h>
#include <crmd.h>
#include <crm/common/util.h>
static void
crmdManagedChildDied(GPid pid, gint status, gpointer user_data)
{
struct crm_subsystem_s *the_subsystem = user_data;
if(WIFSIGNALED(status)) {
int signo = WTERMSIG(status);
int core = WCOREDUMP(status);
crm_notice("Child process %s terminated with signal %d (pid=%d, core=%d)",
the_subsystem->name, signo, the_subsystem->pid, core);
} else if(WIFEXITED(status)) {
int exitcode = WEXITSTATUS(status);
do_crm_log(exitcode == 0 ? LOG_INFO : LOG_ERR,
"Child process %s exited (pid=%d, rc=%d)", the_subsystem->name, the_subsystem->pid, exitcode);
} else {
crm_err("Process %s:[%d] exited?", the_subsystem->name, the_subsystem->pid);
}
}
gboolean
stop_subsystem(struct crm_subsystem_s *the_subsystem, gboolean force_quit)
{
int quit_signal = SIGTERM;
crm_trace("Stopping sub-system \"%s\"", the_subsystem->name);
clear_bit(fsa_input_register, the_subsystem->flag_required);
if (the_subsystem->pid <= 0) {
crm_trace("Client %s not running", the_subsystem->name);
return FALSE;
}
if (is_set(fsa_input_register, the_subsystem->flag_connected) == FALSE) {
/* running but not yet connected */
crm_debug("Stopping %s before it had connected", the_subsystem->name);
}
/*
if(force_quit && the_subsystem->sent_kill == FALSE) {
quit_signal = SIGKILL;
} else if(force_quit) {
crm_debug("Already sent -KILL to %s: [%d]",
the_subsystem->name, the_subsystem->pid);
}
*/
errno = 0;
if (kill(the_subsystem->pid, quit_signal) == 0) {
crm_info("Sent -TERM to %s: [%d]", the_subsystem->name, the_subsystem->pid);
the_subsystem->sent_kill = TRUE;
} else {
crm_perror(LOG_ERR, "Sent -TERM to %s: [%d]", the_subsystem->name, the_subsystem->pid);
}
return TRUE;
}
gboolean
start_subsystem(struct crm_subsystem_s * the_subsystem)
{
pid_t pid;
struct stat buf;
int s_res;
unsigned int j;
struct rlimit oflimits;
const char *devnull = "/dev/null";
crm_info("Starting sub-system \"%s\"", the_subsystem->name);
if (the_subsystem->pid > 0) {
crm_warn("Client %s already running as pid %d",
the_subsystem->name, (int)the_subsystem->pid);
/* starting a started X is not an error */
return TRUE;
}
/*
* We want to ensure that the exec will succeed before
* we bother forking.
*/
if (access(the_subsystem->path, F_OK | X_OK) != 0) {
crm_perror(LOG_ERR, "Cannot (access) exec %s", the_subsystem->path);
return FALSE;
}
s_res = stat(the_subsystem->command, &buf);
if (s_res != 0) {
crm_perror(LOG_ERR, "Cannot (stat) exec %s", the_subsystem->command);
return FALSE;
}
/* We need to fork so we can make child procs not real time */
switch (pid = fork()) {
case -1:
crm_err("Cannot fork.");
return FALSE;
default: /* Parent */
g_child_watch_add(pid, crmdManagedChildDied, the_subsystem);
crm_trace("Client %s is has pid: %d", the_subsystem->name, pid);
the_subsystem->pid = pid;
return TRUE;
case 0: /* Child */
/* create a new process group to avoid
* being interupted by heartbeat
*/
setpgid(0, 0);
break;
}
crm_debug("Executing \"%s (%s)\" (pid %d)",
the_subsystem->command, the_subsystem->name, (int)getpid());
/* A precautionary measure */
getrlimit(RLIMIT_NOFILE, &oflimits);
for (j = 0; j < oflimits.rlim_cur; ++j) {
close(j);
}
(void)open(devnull, O_RDONLY); /* Stdin: fd 0 */
(void)open(devnull, O_WRONLY); /* Stdout: fd 1 */
(void)open(devnull, O_WRONLY); /* Stderr: fd 2 */
{
char *opts[] = { strdup(the_subsystem->command), NULL };
(void)execvp(the_subsystem->command, opts);
}
/* Should not happen */
crm_perror(LOG_ERR, "FATAL: Cannot exec %s", the_subsystem->command);
exit(100); /* Suppress respawning */
return TRUE; /* never reached */
}

File Metadata

Mime Type
text/x-c
Expires
Thu, Oct 16, 3:06 PM (13 h, 56 m)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
2529759
Default Alt Text
subsystems.c (5 KB)

Event Timeline