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main.c
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main.c
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/* -*-pgsql-c-*- */
/*
* $Header: /cvsroot/pgpool/pgpool-II/main.c,v 1.55 2009/11/14 11:36:35 t-ishii Exp $
*
* pgpool: a language independent connection pool server for PostgreSQL
* written by Tatsuo Ishii
*
* Copyright (c) 2003-2009 PgPool Global Development Group
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation, and that the name of the
* author not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. The author makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*/
#include "pool.h"
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/time.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "version.h"
#include "parser/pool_memory.h"
#include "parser/pool_string.h"
/*
* Process pending signal actions.
*/
#define CHECK_REQUEST \
do { \
if (wakeup_request) \
{ \
wakeup_children(); \
wakeup_request = 0; \
} \
if (failover_request) \
{ \
failover(); \
failover_request = 0; \
} \
if (sigchld_request) \
{ \
reaper(); \
} \
if (reload_config_request) \
{ \
reload_config(); \
reload_config_request = 0; \
} \
} while (0)
#define PGPOOLMAXLITSENQUEUELENGTH 10000
static void daemonize(void);
static int read_pid_file(void);
static void write_pid_file(void);
static pid_t pcp_fork_a_child(int unix_fd, int inet_fd, char *pcp_conf_file);
static pid_t fork_a_child(int unix_fd, int inet_fd, int id);
static int create_unix_domain_socket(struct sockaddr_un un_addr_tmp);
static int create_inet_domain_socket(const char *hostname, const int port);
static void myexit(int code);
static void failover(void);
static void reaper(void);
static void wakeup_children(void);
static void reload_config(void);
static int pool_pause(struct timeval *timeout);
static void pool_sleep(unsigned int second);
static void kill_all_children(int sig);
static int get_next_master_node(void);
static RETSIGTYPE exit_handler(int sig);
static RETSIGTYPE reap_handler(int sig);
static RETSIGTYPE failover_handler(int sig);
static RETSIGTYPE reload_config_handler(int sig);
static RETSIGTYPE health_check_timer_handler(int sig);
static RETSIGTYPE wakeup_handler(int sig);
static void usage(void);
static void show_version(void);
static void stop_me(void);
static int trigger_failover_command(int node, const char *command_line);
static struct sockaddr_un un_addr; /* unix domain socket path */
static struct sockaddr_un pcp_un_addr; /* unix domain socket path for PCP */
ProcessInfo *pids; /* shmem child pid table */
/*
* shmem connection info table
* this is a two dimension array. i.e.:
* con_info[pool_config->num_init_children][pool_config->max_pool]
*/
ConnectionInfo *con_info;
static int unix_fd; /* unix domain socket fd */
static int inet_fd; /* inet domain socket fd */
static int pcp_pid; /* pid for child process handling PCP */
static int pcp_unix_fd; /* unix domain socket fd for PCP (not used) */
static int pcp_inet_fd; /* inet domain socket fd for PCP */
static char pcp_conf_file[POOLMAXPATHLEN+1]; /* path for pcp.conf */
static char conf_file[POOLMAXPATHLEN+1];
static char hba_file[POOLMAXPATHLEN+1];
static int exiting = 0; /* non 0 if I'm exiting */
static int switching = 0; /* non 0 if I'm fail overing or degenerating */
#ifdef NOT_USED
static int degenerated = 0; /* set non 0 if already degenerated */
#endif
static int clear_cache = 0; /* non 0 if clear chache option (-c) is given */
static int not_detach = 0; /* non 0 if non detach option (-n) is given */
int debug = 0; /* non 0 if debug option is given (-d) */
pid_t mypid; /* pgpool parent process id */
long int weight_master; /* normalized weight of master (0-RAND_MAX range) */
static int stop_sig = SIGTERM; /* stopping signal default value */
static volatile sig_atomic_t health_check_timer_expired; /* non 0 if health check timer expired */
POOL_REQUEST_INFO *Req_info; /* request info area in shared memory */
volatile sig_atomic_t *InRecovery; /* non 0 if recovery is started */
volatile sig_atomic_t reload_config_request = 0;
static volatile sig_atomic_t failover_request = 0;
static volatile sig_atomic_t sigchld_request = 0;
static volatile sig_atomic_t wakeup_request = 0;
static int pipe_fds[2]; /* for delivering signals */
int my_proc_id;
int myargc;
char **myargv;
/*
* pgpool main program
*/
int main(int argc, char **argv)
{
int opt;
int i;
int pid;
int size;
int retrycnt;
int sys_retrycnt;
myargc = argc;
myargv = argv;
snprintf(conf_file, sizeof(conf_file), "%s/%s", DEFAULT_CONFIGDIR, POOL_CONF_FILE_NAME);
snprintf(pcp_conf_file, sizeof(pcp_conf_file), "%s/%s", DEFAULT_CONFIGDIR, PCP_PASSWD_FILE_NAME);
snprintf(hba_file, sizeof(hba_file), "%s/%s", DEFAULT_CONFIGDIR, HBA_CONF_FILE_NAME);
while ((opt = getopt(argc, argv, "a:cdf:F:hm:nv")) != -1)
{
switch (opt)
{
case 'a': /* specify hba configuration file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(hba_file, optarg, sizeof(hba_file));
break;
case 'c': /* clear cache option */
clear_cache = 1;
break;
case 'd': /* debug option */
debug = 1;
break;
case 'f': /* specify configuration file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(conf_file, optarg, sizeof(conf_file));
break;
case 'F': /* specify PCP password file */
if (!optarg)
{
usage();
exit(1);
}
strncpy(pcp_conf_file, optarg, sizeof(pcp_conf_file));
break;
case 'h':
usage();
exit(0);
break;
case 'm': /* stop mode */
if (!optarg)
{
usage();
exit(1);
}
if (*optarg == 's' || !strcmp("smart", optarg))
stop_sig = SIGTERM; /* smart shutdown */
else if (*optarg == 'f' || !strcmp("fast", optarg))
stop_sig = SIGINT; /* fast shutdown */
else if (*optarg == 'i' || !strcmp("immediate", optarg))
stop_sig = SIGQUIT; /* immediate shutdown */
else
{
usage();
exit(1);
}
break;
case 'n': /* no detaching control ttys */
not_detach = 1;
break;
case 'v':
show_version();
exit(0);
default:
usage();
exit(1);
}
}
mypid = getpid();
if (pool_init_config())
exit(1);
if (pool_get_config(conf_file, INIT_CONFIG))
{
pool_error("Unable to get configuration. Exiting...");
exit(1);
}
if (pool_config->enable_pool_hba)
load_hba(hba_file);
/*
* If a non-switch argument remains, then it should be either "reload" or "stop".
*/
if (optind == (argc - 1))
{
if (!strcmp(argv[optind], "reload"))
{
pid_t pid;
pid = read_pid_file();
if (pid < 0)
{
pool_error("could not read pid file");
pool_shmem_exit(1);
exit(1);
}
if (kill(pid, SIGHUP) == -1)
{
pool_error("could not reload configuration file pid: %d. reason: %s", pid, strerror(errno));
pool_shmem_exit(1);
exit(1);
}
pool_shmem_exit(0);
exit(0);
}
if (!strcmp(argv[optind], "stop"))
{
stop_me();
pool_shmem_exit(0);
exit(0);
}
else
{
usage();
pool_shmem_exit(1);
exit(1);
}
}
/*
* else if no non-switch argument remains, then it should be a start request
*/
else if (optind == argc)
{
pid = read_pid_file();
if (pid > 0)
{
if (kill(pid, 0) == 0)
{
fprintf(stderr, "pid file found. is another pgpool(%d) is running?\n", pid);
exit(1);
}
else
fprintf(stderr, "pid file found but it seems bogus. Trying to start pgpool anyway...\n");
}
}
/*
* otherwise an error...
*/
else
{
usage();
exit(1);
}
/* set signal masks */
poolinitmask();
if (not_detach)
write_pid_file();
else
daemonize();
if (pool_semaphore_create(MAX_NUM_SEMAPHORES))
{
pool_error("Unable to create semaphores. Exiting...");
pool_shmem_exit(1);
exit(1);
}
/* clear cache */
if (clear_cache && pool_config->enable_query_cache && SYSDB_STATUS == CON_UP)
{
Interval interval[1];
interval[0].quantity = 0;
interval[0].unit = second;
pool_clear_cache_by_time(interval, 1);
}
/* set unix domain socket path */
snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/.s.PGSQL.%d",
pool_config->socket_dir,
pool_config->port);
/* set up signal handlers */
pool_signal(SIGPIPE, SIG_IGN);
/* create unix domain socket */
unix_fd = create_unix_domain_socket(un_addr);
/* create inet domain socket if any */
if (pool_config->listen_addresses[0])
{
inet_fd = create_inet_domain_socket(pool_config->listen_addresses, pool_config->port);
}
size = pool_config->num_init_children * pool_config->max_pool * sizeof(ConnectionInfo);
con_info = pool_shared_memory_create(size);
if (con_info == NULL)
{
pool_error("failed to allocate connection informations");
myexit(1);
}
memset(con_info, 0, size);
size = pool_config->num_init_children * (sizeof(ProcessInfo));
pids = pool_shared_memory_create(size);
if (pids == NULL)
{
pool_error("failed to allocate pids");
myexit(1);
}
memset(pids, 0, size);
for (i = 0; i < pool_config->num_init_children; i++)
{
pids[i].connection_info = &con_info[i * pool_config->max_pool];
}
/* create fail over/switch over event area */
Req_info = pool_shared_memory_create(sizeof(POOL_REQUEST_INFO));
if (Req_info == NULL)
{
pool_error("failed to allocate Req_info");
myexit(1);
}
/* initialize Req_info */
Req_info->kind = NODE_UP_REQUEST;
memset(Req_info->node_id, -1, sizeof(int) * MAX_NUM_BACKENDS);
Req_info->master_node_id = get_next_master_node();
Req_info->conn_counter = 0;
InRecovery = pool_shared_memory_create(sizeof(int));
if (InRecovery == NULL)
{
pool_error("failed to allocate InRecovery");
myexit(1);
}
*InRecovery = 0;
/*
* We need to block signal here. Otherwise child might send some
* signals, for example SIGUSR1(fail over). Children will inherit
* signal blocking but they do unblock signals at the very beginning
* of process. So this is harmless.
*/
POOL_SETMASK(&BlockSig);
/* fork the children */
for (i=0;i<pool_config->num_init_children;i++)
{
pids[i].pid = fork_a_child(unix_fd, inet_fd, i);
pids[i].start_time = time(NULL);
}
/* set up signal handlers */
pool_signal(SIGTERM, exit_handler);
pool_signal(SIGINT, exit_handler);
pool_signal(SIGQUIT, exit_handler);
pool_signal(SIGCHLD, reap_handler);
pool_signal(SIGUSR1, failover_handler);
pool_signal(SIGUSR2, wakeup_handler);
pool_signal(SIGHUP, reload_config_handler);
/* create pipe for delivering event */
if (pipe(pipe_fds) < 0)
{
pool_error("failed to create pipe");
myexit(1);
}
pool_log("pgpool successfully started");
/* fork a child for PCP handling */
snprintf(pcp_un_addr.sun_path, sizeof(pcp_un_addr.sun_path), "%s/.s.PGSQL.%d",
pool_config->pcp_socket_dir,
pool_config->pcp_port);
pcp_unix_fd = create_unix_domain_socket(pcp_un_addr);
/* maybe change "*" to pool_config->pcp_listen_addresses */
pcp_inet_fd = create_inet_domain_socket("*", pool_config->pcp_port);
pcp_pid = pcp_fork_a_child(pcp_unix_fd, pcp_inet_fd, pcp_conf_file);
retrycnt = 0; /* reset health check retry counter */
sys_retrycnt = 0; /* reset SystemDB health check retry counter */
/*
* This is the main loop
*/
for (;;)
{
CHECK_REQUEST;
/* do we need health checking for PostgreSQL? */
if (pool_config->health_check_period > 0)
{
int sts;
int sys_sts = 0;
unsigned int sleep_time;
if (retrycnt == 0)
{
pool_debug("starting health checking");
}
else
{
pool_debug("retrying %d th health checking", retrycnt);
}
if (pool_config->health_check_timeout > 0)
{
/*
* set health checker timeout. we want to detect
* communication path failure much earlier before
* TCP/IP stack detects it.
*/
pool_signal(SIGALRM, health_check_timer_handler);
alarm(pool_config->health_check_timeout);
}
/*
* do actual health check. trying to connect to the backend
*/
errno = 0;
health_check_timer_expired = 0;
POOL_SETMASK(&UnBlockSig);
sts = health_check();
POOL_SETMASK(&BlockSig);
if (pool_config->parallel_mode || pool_config->enable_query_cache)
sys_sts = system_db_health_check();
if ((sts > 0 || sys_sts < 0) && (errno != EINTR || (errno == EINTR && health_check_timer_expired)))
{
if (sts > 0)
{
sts--;
if (!pool_config->parallel_mode)
{
pool_log("set %d th backend down status", sts);
Req_info->kind = NODE_DOWN_REQUEST;
Req_info->node_id[0] = sts;
failover();
/* need to distribute this info to children */
}
else
{
retrycnt++;
pool_signal(SIGALRM, SIG_IGN); /* Cancel timer */
if (retrycnt > NUM_BACKENDS)
{
/* retry count over */
pool_log("set %d th backend down status", sts);
Req_info->kind = NODE_DOWN_REQUEST;
Req_info->node_id[0] = sts;
failover();
retrycnt = 0;
}
else
{
/* continue to retry */
sleep_time = pool_config->health_check_period/NUM_BACKENDS;
pool_debug("retry sleep time: %d seconds", sleep_time);
pool_sleep(sleep_time);
continue;
}
}
}
if (sys_sts < 0)
{
sys_retrycnt++;
pool_signal(SIGALRM, SIG_IGN);
if (sys_retrycnt > NUM_BACKENDS)
{
pool_log("set SystemDB down status");
SYSDB_STATUS = CON_DOWN;
sys_retrycnt = 0;
}
else if (sts == 0) /* goes to sleep only when SystemDB alone was down */
{
sleep_time = pool_config->health_check_period/NUM_BACKENDS;
pool_debug("retry sleep time: %d seconds", sleep_time);
pool_sleep(sleep_time);
continue;
}
}
}
if (pool_config->health_check_timeout > 0)
{
/* seems ok. cancel health check timer */
pool_signal(SIGALRM, SIG_IGN);
}
sleep_time = pool_config->health_check_period;
pool_sleep(sleep_time);
}
else
{
for (;;)
{
int r;
struct timeval t = {3, 0};
POOL_SETMASK(&UnBlockSig);
r = pool_pause(&t);
POOL_SETMASK(&BlockSig);
if (r > 0)
break;
}
}
}
pool_shmem_exit(0);
}
static void show_version(void)
{
fprintf(stderr, "%s version %s (%s)\n", PACKAGE, VERSION, PGPOOLVERSION);
}
static void usage(void)
{
fprintf(stderr, "%s version %s (%s),\n", PACKAGE, VERSION, PGPOOLVERSION);
fprintf(stderr, " a generic connection pool/replication/load balance server for PostgreSQL\n\n");
fprintf(stderr, "Usage:\n");
fprintf(stderr, " pgpool [ -c] [ -f CONFIG_FILE ] [ -F PCP_CONFIG_FILE ] [ -a HBA_CONFIG_FILE ]\n");
fprintf(stderr, " [ -n ] [ -d ]\n");
fprintf(stderr, " pgpool [ -f CONFIG_FILE ] [ -F PCP_CONFIG_FILE ] [ -a HBA_CONFIG_FILE ]\n");
fprintf(stderr, " [ -m SHUTDOWN-MODE ] stop\n");
fprintf(stderr, " pgpool [ -f CONFIG_FILE ] [ -F PCP_CONFIG_FILE ] [ -a HBA_CONFIG_FILE ] reload\n\n");
fprintf(stderr, "Common options:\n");
fprintf(stderr, " -a HBA_CONFIG_FILE Sets the path to the pool_hba.conf configuration file\n");
fprintf(stderr, " (default: %s/%s)\n",DEFAULT_CONFIGDIR, HBA_CONF_FILE_NAME);
fprintf(stderr, " -f CONFIG_FILE Sets the path to the pgpool.conf configuration file\n");
fprintf(stderr, " (default: %s/%s)\n",DEFAULT_CONFIGDIR, POOL_CONF_FILE_NAME);
fprintf(stderr, " -F PCP_CONFIG_FILE Sets the path to the pcp.conf configuration file\n");
fprintf(stderr, " (default: %s/%s)\n",DEFAULT_CONFIGDIR, PCP_PASSWD_FILE_NAME);
fprintf(stderr, " -h Prints this help\n\n");
fprintf(stderr, "Start options:\n");
fprintf(stderr, " -c Clears query cache (enable_query_cache must be on)\n");
fprintf(stderr, " -n Don't run in daemon mode, does not detach control tty\n");
fprintf(stderr, " -d Debug mode\n\n");
fprintf(stderr, "Stop options:\n");
fprintf(stderr, " -m SHUTDOWN-MODE Can be \"smart\", \"fast\", or \"immediate\"\n\n");
fprintf(stderr, "Shutdown modes are:\n");
fprintf(stderr, " smart quit after all clients have disconnected\n");
fprintf(stderr, " fast quit directly, with proper shutdown\n");
fprintf(stderr, " immediate quit without complete shutdown; will lead to recovery on restart\n");
}
/*
* detach control ttys
*/
static void daemonize(void)
{
int i;
pid_t pid;
int fdlimit;
pid = fork();
if (pid == (pid_t) -1)
{
pool_error("fork() failed. reason: %s", strerror(errno));
pool_shmem_exit(1);
exit(1);
return; /* not reached */
}
else if (pid > 0)
{ /* parent */
pool_shmem_exit(0);
exit(0);
}
#ifdef HAVE_SETSID
if (setsid() < 0)
{
pool_error("setsid() failed. reason:%s", strerror(errno));
pool_shmem_exit(1);
exit(1);
}
#endif
mypid = getpid();
chdir("/");
i = open("/dev/null", O_RDWR);
dup2(i, 0);
dup2(i, 1);
dup2(i, 2);
fdlimit = sysconf(_SC_OPEN_MAX);
for (i = 3; i < fdlimit; i++)
close(i);
write_pid_file();
}
/*
* stop myself
*/
static void stop_me(void)
{
pid_t pid;
pid = read_pid_file();
if (pid < 0)
{
pool_error("could not read pid file");
pool_shmem_exit(1);
exit(1);
}
if (kill(pid, stop_sig) == -1)
{
pool_error("could not stop pid: %d. reason: %s", pid, strerror(errno));
pool_shmem_exit(1);
exit(1);
}
fprintf(stderr, "stop request sent to pgpool. waiting for termination...");
while (kill(pid, 0) == 0)
{
fprintf(stderr, ".");
sleep(1);
}
fprintf(stderr, "done.\n");
}
/*
* read the pid file
*/
static int read_pid_file(void)
{
FILE *fd;
char pidbuf[128];
fd = fopen(pool_config->pid_file_name, "r");
if (!fd)
{
return -1;
}
if (fread(pidbuf, 1, sizeof(pidbuf), fd) <= 0)
{
pool_error("could not read pid file as %s. reason: %s",
pool_config->pid_file_name, strerror(errno));
fclose(fd);
return -1;
}
fclose(fd);
return(atoi(pidbuf));
}
/*
* write the pid file
*/
static void write_pid_file(void)
{
FILE *fd;
char pidbuf[128];
fd = fopen(pool_config->pid_file_name, "w");
if (!fd)
{
pool_error("could not open pid file as %s. reason: %s",
pool_config->pid_file_name, strerror(errno));
pool_shmem_exit(1);
exit(1);
}
snprintf(pidbuf, sizeof(pidbuf), "%d", (int)getpid());
fwrite(pidbuf, strlen(pidbuf)+1, 1, fd);
if (fclose(fd))
{
pool_error("could not write pid file as %s. reason: %s",
pool_config->pid_file_name, strerror(errno));
pool_shmem_exit(1);
exit(1);
}
}
/*
* fork a child for PCP
*/
pid_t pcp_fork_a_child(int unix_fd, int inet_fd, char *pcp_conf_file)
{
pid_t pid;
pid = fork();
if (pid == 0)
{
close(pipe_fds[0]);
close(pipe_fds[1]);
myargv = save_ps_display_args(myargc, myargv);
/* call PCP child main */
POOL_SETMASK(&UnBlockSig);
reload_config_request = 0;
pcp_do_child(unix_fd, inet_fd, pcp_conf_file);
}
else if (pid == -1)
{
pool_error("fork() failed. reason: %s", strerror(errno));
myexit(1);
}
return pid;
}
/*
* fork a child
*/
pid_t fork_a_child(int unix_fd, int inet_fd, int id)
{
pid_t pid;
pid = fork();
if (pid == 0)
{
/* Before we unconditionally closed pipe_fds[0] and pipe_fds[1]
* here, which is apparently wrong since in the start up of
* pgpool, pipe(2) is not called yet and it mistakenly closes
* fd 0. Now we check the fd > 0 before close(), expecting
* pipe returns fds greater than 0. Note that we cannot
* unconditionally remove close(2) calls since fork_a_child()
* may be called *after* pgpool starting up.
*/
if (pipe_fds[0] > 0)
{
close(pipe_fds[0]);
close(pipe_fds[1]);
}
myargv = save_ps_display_args(myargc, myargv);
/* call child main */
POOL_SETMASK(&UnBlockSig);
reload_config_request = 0;
my_proc_id = id;
do_child(unix_fd, inet_fd);
}
else if (pid == -1)
{
pool_error("fork() failed. reason: %s", strerror(errno));
myexit(1);
}
return pid;
}
/*
* create inet domain socket
*/
static int create_inet_domain_socket(const char *hostname, const int port)
{
struct sockaddr_in addr;
int fd;
int status;
int one = 1;
int len;
int backlog;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd == -1)
{
pool_error("Failed to create INET domain socket. reason: %s", strerror(errno));
myexit(1);
}
if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one,
sizeof(one))) == -1)
{
pool_error("setsockopt() failed. reason: %s", strerror(errno));
myexit(1);
}
memset((char *) &addr, 0, sizeof(addr));
((struct sockaddr *)&addr)->sa_family = AF_INET;
if (strcmp(hostname, "*")==0)
{
addr.sin_addr.s_addr = htonl(INADDR_ANY);
}
else
{
struct hostent *hostinfo;
hostinfo = gethostbyname(hostname);
if (!hostinfo)
{
pool_error("could not resolve host name \"%s\": %s", hostname, hstrerror(h_errno));
myexit(1);
}
addr.sin_addr = *(struct in_addr *) hostinfo->h_addr;
}
addr.sin_port = htons(port);
len = sizeof(struct sockaddr_in);
status = bind(fd, (struct sockaddr *)&addr, len);
if (status == -1)
{
char *host = "", *serv = "";
char hostname[NI_MAXHOST], servname[NI_MAXSERV];
if (getnameinfo((struct sockaddr *) &addr, len, hostname, sizeof(hostname), servname, sizeof(servname), 0) == 0) {
host = hostname;
serv = servname;
}
pool_error("bind(%s:%s) failed. reason: %s", host, serv, strerror(errno));
myexit(1);
}
backlog = pool_config->num_init_children * 2;
if (backlog > PGPOOLMAXLITSENQUEUELENGTH)
backlog = PGPOOLMAXLITSENQUEUELENGTH;
status = listen(fd, backlog);
if (status < 0)
{
pool_error("listen() failed. reason: %s", strerror(errno));
myexit(1);
}
return fd;
}
/*
* create UNIX domain socket
*/
static int create_unix_domain_socket(struct sockaddr_un un_addr_tmp)
{
struct sockaddr_un addr;
int fd;
int status;
int len;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1)
{
pool_error("Failed to create UNIX domain socket. reason: %s", strerror(errno));
myexit(1);
}
memset((char *) &addr, 0, sizeof(addr));
((struct sockaddr *)&addr)->sa_family = AF_UNIX;
snprintf(addr.sun_path, sizeof(addr.sun_path), un_addr_tmp.sun_path);
len = sizeof(struct sockaddr_un);
status = bind(fd, (struct sockaddr *)&addr, len);
if (status == -1)
{
pool_error("bind(%s) failed. reason: %s", addr.sun_path, strerror(errno));
myexit(1);
}
if (chmod(un_addr_tmp.sun_path, 0777) == -1)
{
pool_error("chmod() failed. reason: %s", strerror(errno));
myexit(1);
}
status = listen(fd, PGPOOLMAXLITSENQUEUELENGTH);
if (status < 0)
{
pool_error("listen() failed. reason: %s", strerror(errno));
myexit(1);
}
return fd;
}
static void myunlink(const char* path)
{
if (unlink(path) == 0) return;
pool_error("unlink(%s) failed: %s", path, strerror(errno));
}
static void myexit(int code)
{
int i;
if (getpid() != mypid)
return;
if (pids != NULL) {
POOL_SETMASK(&AuthBlockSig);
exiting = 1;
for (i = 0; i < pool_config->num_init_children; i++)
{
pid_t pid = pids[i].pid;
if (pid)
{
kill(pid, SIGTERM);
}
}
while (wait(NULL) > 0)
;
if (errno != ECHILD)
pool_error("wait() failed. reason:%s", strerror(errno));
POOL_SETMASK(&UnBlockSig);
}
myunlink(un_addr.sun_path);
myunlink(pcp_un_addr.sun_path);
myunlink(pool_config->pid_file_name);
pool_shmem_exit(code);
exit(code);
}
void notice_backend_error(int node_id)