/
pg_ctl.c
2573 lines (2245 loc) · 65.7 KB
/
pg_ctl.c
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/*-------------------------------------------------------------------------
*
* pg_ctl --- start/stops/restarts the PostgreSQL server
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
*
* src/bin/pg_ctl/pg_ctl.c
*
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "common/file_perm.h"
#include "common/logging.h"
#include "common/string.h"
#include "getopt_long.h"
#include "utils/pidfile.h"
#ifdef WIN32 /* on Unix, we don't need libpq */
#include "pqexpbuffer.h"
#endif
/* PID can be negative for standalone backend */
typedef long pgpid_t;
typedef enum
{
SMART_MODE,
FAST_MODE,
IMMEDIATE_MODE
} ShutdownMode;
typedef enum
{
POSTMASTER_READY,
POSTMASTER_STILL_STARTING,
POSTMASTER_FAILED
} WaitPMResult;
typedef enum
{
NO_COMMAND = 0,
INIT_COMMAND,
START_COMMAND,
STOP_COMMAND,
RESTART_COMMAND,
RELOAD_COMMAND,
STATUS_COMMAND,
PROMOTE_COMMAND,
LOGROTATE_COMMAND,
KILL_COMMAND,
REGISTER_COMMAND,
UNREGISTER_COMMAND,
RUN_AS_SERVICE_COMMAND
} CtlCommand;
#define DEFAULT_WAIT 60
#define USEC_PER_SEC 1000000
#define WAITS_PER_SEC 10 /* should divide USEC_PER_SEC evenly */
static bool do_wait = true;
static int wait_seconds = DEFAULT_WAIT;
static bool wait_seconds_arg = false;
static bool silent_mode = false;
static ShutdownMode shutdown_mode = FAST_MODE;
static int sig = SIGINT; /* default */
static CtlCommand ctl_command = NO_COMMAND;
static char *pg_data = NULL;
static char *pg_config = NULL;
static char *pgdata_opt = NULL;
static char *post_opts = NULL;
static const char *progname;
static char *log_file = NULL;
static char *exec_path = NULL;
static char *event_source = NULL;
static char *register_servicename = "PostgreSQL"; /* FIXME: + version ID? */
static char *register_username = NULL;
static char *register_password = NULL;
static char *argv0 = NULL;
static bool allow_core_files = false;
static time_t start_time;
static char postopts_file[MAXPGPATH];
static char version_file[MAXPGPATH];
static char pid_file[MAXPGPATH];
static char backup_file[MAXPGPATH];
static char promote_file[MAXPGPATH];
static char logrotate_file[MAXPGPATH];
static volatile pgpid_t postmasterPID = -1;
#ifdef WIN32
static DWORD pgctl_start_type = SERVICE_AUTO_START;
static SERVICE_STATUS status;
static SERVICE_STATUS_HANDLE hStatus = (SERVICE_STATUS_HANDLE) 0;
static HANDLE shutdownHandles[2];
#define shutdownEvent shutdownHandles[0]
#define postmasterProcess shutdownHandles[1]
#endif
static void write_stderr(const char *fmt,...) pg_attribute_printf(1, 2);
static void do_advice(void);
static void do_help(void);
static void set_mode(char *modeopt);
static void set_sig(char *signame);
static void do_init(void);
static void do_start(void);
static void do_stop(void);
static void do_restart(void);
static void do_reload(void);
static void do_status(void);
static void do_promote(void);
static void do_logrotate(void);
static void do_kill(pgpid_t pid);
static void print_msg(const char *msg);
static void adjust_data_dir(void);
#ifdef WIN32
#include <versionhelpers.h>
static bool pgwin32_IsInstalled(SC_HANDLE);
static char *pgwin32_CommandLine(bool);
static void pgwin32_doRegister(void);
static void pgwin32_doUnregister(void);
static void pgwin32_SetServiceStatus(DWORD);
static void WINAPI pgwin32_ServiceHandler(DWORD);
static void WINAPI pgwin32_ServiceMain(DWORD, LPTSTR *);
static void pgwin32_doRunAsService(void);
static int CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo, bool as_service);
static PTOKEN_PRIVILEGES GetPrivilegesToDelete(HANDLE hToken);
#endif
static pgpid_t get_pgpid(bool is_status_request);
static char **readfile(const char *path, int *numlines);
static void free_readfile(char **optlines);
static pgpid_t start_postmaster(void);
static void read_post_opts(void);
static WaitPMResult wait_for_postmaster(pgpid_t pm_pid, bool do_checkpoint);
static bool postmaster_is_alive(pid_t pid);
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_CORE)
static void unlimit_core_size(void);
#endif
static DBState get_control_dbstate(void);
#ifdef WIN32
static void
write_eventlog(int level, const char *line)
{
static HANDLE evtHandle = INVALID_HANDLE_VALUE;
if (silent_mode && level == EVENTLOG_INFORMATION_TYPE)
return;
if (evtHandle == INVALID_HANDLE_VALUE)
{
evtHandle = RegisterEventSource(NULL,
event_source ? event_source : DEFAULT_EVENT_SOURCE);
if (evtHandle == NULL)
{
evtHandle = INVALID_HANDLE_VALUE;
return;
}
}
ReportEvent(evtHandle,
level,
0,
0, /* All events are Id 0 */
NULL,
1,
0,
&line,
NULL);
}
#endif
/*
* Write errors to stderr (or by equal means when stderr is
* not available).
*/
static void
write_stderr(const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
#ifndef WIN32
/* On Unix, we just fprintf to stderr */
vfprintf(stderr, fmt, ap);
#else
/*
* On Win32, we print to stderr if running on a console, or write to
* eventlog if running as a service
*/
if (pgwin32_is_service()) /* Running as a service */
{
char errbuf[2048]; /* Arbitrary size? */
vsnprintf(errbuf, sizeof(errbuf), fmt, ap);
write_eventlog(EVENTLOG_ERROR_TYPE, errbuf);
}
else
/* Not running as service, write to stderr */
vfprintf(stderr, fmt, ap);
#endif
va_end(ap);
}
/*
* Given an already-localized string, print it to stdout unless the
* user has specified that no messages should be printed.
*/
static void
print_msg(const char *msg)
{
if (!silent_mode)
{
fputs(msg, stdout);
fflush(stdout);
}
}
static pgpid_t
get_pgpid(bool is_status_request)
{
FILE *pidf;
long pid;
struct stat statbuf;
if (stat(pg_data, &statbuf) != 0)
{
if (errno == ENOENT)
write_stderr(_("%s: directory \"%s\" does not exist\n"), progname,
pg_data);
else
write_stderr(_("%s: could not access directory \"%s\": %s\n"), progname,
pg_data, strerror(errno));
/*
* The Linux Standard Base Core Specification 3.1 says this should
* return '4, program or service status is unknown'
* https://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
*/
exit(is_status_request ? 4 : 1);
}
if (stat(version_file, &statbuf) != 0 && errno == ENOENT)
{
write_stderr(_("%s: directory \"%s\" is not a database cluster directory\n"),
progname, pg_data);
exit(is_status_request ? 4 : 1);
}
pidf = fopen(pid_file, "r");
if (pidf == NULL)
{
/* No pid file, not an error on startup */
if (errno == ENOENT)
return 0;
else
{
write_stderr(_("%s: could not open PID file \"%s\": %s\n"),
progname, pid_file, strerror(errno));
exit(1);
}
}
if (fscanf(pidf, "%ld", &pid) != 1)
{
/* Is the file empty? */
if (ftell(pidf) == 0 && feof(pidf))
write_stderr(_("%s: the PID file \"%s\" is empty\n"),
progname, pid_file);
else
write_stderr(_("%s: invalid data in PID file \"%s\"\n"),
progname, pid_file);
exit(1);
}
fclose(pidf);
return (pgpid_t) pid;
}
/*
* get the lines from a text file - return NULL if file can't be opened
*
* Trailing newlines are deleted from the lines (this is a change from pre-v10)
*
* *numlines is set to the number of line pointers returned; there is
* also an additional NULL pointer after the last real line.
*/
static char **
readfile(const char *path, int *numlines)
{
int fd;
int nlines;
char **result;
char *buffer;
char *linebegin;
int i;
int n;
int len;
struct stat statbuf;
*numlines = 0; /* in case of failure or empty file */
/*
* Slurp the file into memory.
*
* The file can change concurrently, so we read the whole file into memory
* with a single read() call. That's not guaranteed to get an atomic
* snapshot, but in practice, for a small file, it's close enough for the
* current use.
*/
fd = open(path, O_RDONLY | PG_BINARY, 0);
if (fd < 0)
return NULL;
if (fstat(fd, &statbuf) < 0)
{
close(fd);
return NULL;
}
if (statbuf.st_size == 0)
{
/* empty file */
close(fd);
result = (char **) pg_malloc(sizeof(char *));
*result = NULL;
return result;
}
buffer = pg_malloc(statbuf.st_size + 1);
len = read(fd, buffer, statbuf.st_size + 1);
close(fd);
if (len != statbuf.st_size)
{
/* oops, the file size changed between fstat and read */
free(buffer);
return NULL;
}
/*
* Count newlines. We expect there to be a newline after each full line,
* including one at the end of file. If there isn't a newline at the end,
* any characters after the last newline will be ignored.
*/
nlines = 0;
for (i = 0; i < len; i++)
{
if (buffer[i] == '\n')
nlines++;
}
/* set up the result buffer */
result = (char **) pg_malloc((nlines + 1) * sizeof(char *));
*numlines = nlines;
/* now split the buffer into lines */
linebegin = buffer;
n = 0;
for (i = 0; i < len; i++)
{
if (buffer[i] == '\n')
{
int slen = &buffer[i] - linebegin;
char *linebuf = pg_malloc(slen + 1);
memcpy(linebuf, linebegin, slen);
/* we already dropped the \n, but get rid of any \r too */
if (slen > 0 && linebuf[slen - 1] == '\r')
slen--;
linebuf[slen] = '\0';
result[n++] = linebuf;
linebegin = &buffer[i + 1];
}
}
result[n] = NULL;
free(buffer);
return result;
}
/*
* Free memory allocated for optlines through readfile()
*/
static void
free_readfile(char **optlines)
{
char *curr_line = NULL;
int i = 0;
if (!optlines)
return;
while ((curr_line = optlines[i++]))
free(curr_line);
free(optlines);
}
/*
* start/test/stop routines
*/
/*
* Start the postmaster and return its PID.
*
* Currently, on Windows what we return is the PID of the shell process
* that launched the postmaster (and, we trust, is waiting for it to exit).
* So the PID is usable for "is the postmaster still running" checks,
* but cannot be compared directly to postmaster.pid.
*
* On Windows, we also save aside a handle to the shell process in
* "postmasterProcess", which the caller should close when done with it.
*/
static pgpid_t
start_postmaster(void)
{
char cmd[MAXPGPATH];
#ifndef WIN32
pgpid_t pm_pid;
/* Flush stdio channels just before fork, to avoid double-output problems */
fflush(stdout);
fflush(stderr);
pm_pid = fork();
if (pm_pid < 0)
{
/* fork failed */
write_stderr(_("%s: could not start server: %s\n"),
progname, strerror(errno));
exit(1);
}
if (pm_pid > 0)
{
/* fork succeeded, in parent */
return pm_pid;
}
/* fork succeeded, in child */
/*
* If possible, detach the postmaster process from the launching process
* group and make it a group leader, so that it doesn't get signaled along
* with the current group that launched it.
*/
#ifdef HAVE_SETSID
if (setsid() < 0)
{
write_stderr(_("%s: could not start server due to setsid() failure: %s\n"),
progname, strerror(errno));
exit(1);
}
#endif
/*
* Since there might be quotes to handle here, it is easier simply to pass
* everything to a shell to process them. Use exec so that the postmaster
* has the same PID as the current child process.
*/
if (log_file != NULL)
snprintf(cmd, MAXPGPATH, "exec \"%s\" %s%s < \"%s\" >> \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts,
DEVNULL, log_file);
else
snprintf(cmd, MAXPGPATH, "exec \"%s\" %s%s < \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts, DEVNULL);
(void) execl("/bin/sh", "/bin/sh", "-c", cmd, (char *) NULL);
/* exec failed */
write_stderr(_("%s: could not start server: %s\n"),
progname, strerror(errno));
exit(1);
return 0; /* keep dumb compilers quiet */
#else /* WIN32 */
/*
* As with the Unix case, it's easiest to use the shell (CMD.EXE) to
* handle redirection etc. Unfortunately CMD.EXE lacks any equivalent of
* "exec", so we don't get to find out the postmaster's PID immediately.
*/
PROCESS_INFORMATION pi;
const char *comspec;
/* Find CMD.EXE location using COMSPEC, if it's set */
comspec = getenv("COMSPEC");
if (comspec == NULL)
comspec = "CMD";
if (log_file != NULL)
{
/*
* First, touch the log file. The main value of this is that if the
* file is still locked by a previous postmaster run, we'll wait until
* it comes free, instead of failing with ERROR_SHARING_VIOLATION.
* (It'd be better to open the file in a sharing-friendly mode, but we
* can't use CMD.EXE to do that, so work around it. Note that the
* previous postmaster will still have the file open for a short time
* after removing postmaster.pid.)
*/
FILE *fd = fopen(log_file, "a");
if (fd == NULL)
{
write_stderr(_("%s: could not create log file \"%s\": %s\n"),
progname, log_file, strerror(errno));
exit(1);
}
fclose(fd);
snprintf(cmd, MAXPGPATH, "\"%s\" /C \"\"%s\" %s%s < \"%s\" >> \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL, log_file);
}
else
snprintf(cmd, MAXPGPATH, "\"%s\" /C \"\"%s\" %s%s < \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL);
if (!CreateRestrictedProcess(cmd, &pi, false))
{
write_stderr(_("%s: could not start server: error code %lu\n"),
progname, (unsigned long) GetLastError());
exit(1);
}
/* Don't close command process handle here; caller must do so */
postmasterProcess = pi.hProcess;
CloseHandle(pi.hThread);
return pi.dwProcessId; /* Shell's PID, not postmaster's! */
#endif /* WIN32 */
}
/*
* Wait for the postmaster to become ready.
*
* On Unix, pm_pid is the PID of the just-launched postmaster. On Windows,
* it may be the PID of an ancestor shell process, so we can't check the
* contents of postmaster.pid quite as carefully.
*
* On Windows, the static variable postmasterProcess is an implicit argument
* to this routine; it contains a handle to the postmaster process or an
* ancestor shell process thereof.
*
* Note that the checkpoint parameter enables a Windows service control
* manager checkpoint, it's got nothing to do with database checkpoints!!
*/
static WaitPMResult
wait_for_postmaster(pgpid_t pm_pid, bool do_checkpoint)
{
int i;
for (i = 0; i < wait_seconds * WAITS_PER_SEC; i++)
{
char **optlines;
int numlines;
/*
* Try to read the postmaster.pid file. If it's not valid, or if the
* status line isn't there yet, just keep waiting.
*/
if ((optlines = readfile(pid_file, &numlines)) != NULL &&
numlines >= LOCK_FILE_LINE_PM_STATUS)
{
/* File is complete enough for us, parse it */
pgpid_t pmpid;
time_t pmstart;
/*
* Make sanity checks. If it's for the wrong PID, or the recorded
* start time is before pg_ctl started, then either we are looking
* at the wrong data directory, or this is a pre-existing pidfile
* that hasn't (yet?) been overwritten by our child postmaster.
* Allow 2 seconds slop for possible cross-process clock skew.
*/
pmpid = atol(optlines[LOCK_FILE_LINE_PID - 1]);
pmstart = atol(optlines[LOCK_FILE_LINE_START_TIME - 1]);
if (pmstart >= start_time - 2 &&
#ifndef WIN32
pmpid == pm_pid
#else
/* Windows can only reject standalone-backend PIDs */
pmpid > 0
#endif
)
{
/*
* OK, seems to be a valid pidfile from our child. Check the
* status line (this assumes a v10 or later server).
*/
char *pmstatus = optlines[LOCK_FILE_LINE_PM_STATUS - 1];
if (strcmp(pmstatus, PM_STATUS_READY) == 0 ||
strcmp(pmstatus, PM_STATUS_STANDBY) == 0)
{
/* postmaster is done starting up */
free_readfile(optlines);
return POSTMASTER_READY;
}
}
}
/*
* Free the results of readfile.
*
* This is safe to call even if optlines is NULL.
*/
free_readfile(optlines);
/*
* Check whether the child postmaster process is still alive. This
* lets us exit early if the postmaster fails during startup.
*
* On Windows, we may be checking the postmaster's parent shell, but
* that's fine for this purpose.
*/
#ifndef WIN32
{
int exitstatus;
if (waitpid((pid_t) pm_pid, &exitstatus, WNOHANG) == (pid_t) pm_pid)
return POSTMASTER_FAILED;
}
#else
if (WaitForSingleObject(postmasterProcess, 0) == WAIT_OBJECT_0)
return POSTMASTER_FAILED;
#endif
/* Startup still in process; wait, printing a dot once per second */
if (i % WAITS_PER_SEC == 0)
{
#ifdef WIN32
if (do_checkpoint)
{
/*
* Increment the wait hint by 6 secs (connection timeout +
* sleep). We must do this to indicate to the SCM that our
* startup time is changing, otherwise it'll usually send a
* stop signal after 20 seconds, despite incrementing the
* checkpoint counter.
*/
status.dwWaitHint += 6000;
status.dwCheckPoint++;
SetServiceStatus(hStatus, (LPSERVICE_STATUS) &status);
}
else
#endif
print_msg(".");
}
pg_usleep(USEC_PER_SEC / WAITS_PER_SEC);
}
/* out of patience; report that postmaster is still starting up */
return POSTMASTER_STILL_STARTING;
}
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_CORE)
static void
unlimit_core_size(void)
{
struct rlimit lim;
getrlimit(RLIMIT_CORE, &lim);
if (lim.rlim_max == 0)
{
write_stderr(_("%s: cannot set core file size limit; disallowed by hard limit\n"),
progname);
return;
}
else if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
{
lim.rlim_cur = lim.rlim_max;
setrlimit(RLIMIT_CORE, &lim);
}
}
#endif
static void
read_post_opts(void)
{
if (post_opts == NULL)
{
post_opts = ""; /* default */
if (ctl_command == RESTART_COMMAND)
{
char **optlines;
int numlines;
optlines = readfile(postopts_file, &numlines);
if (optlines == NULL)
{
write_stderr(_("%s: could not read file \"%s\"\n"), progname, postopts_file);
exit(1);
}
else if (numlines != 1)
{
write_stderr(_("%s: option file \"%s\" must have exactly one line\n"),
progname, postopts_file);
exit(1);
}
else
{
char *optline;
char *arg1;
optline = optlines[0];
/*
* Are we at the first option, as defined by space and
* double-quote?
*/
if ((arg1 = strstr(optline, " \"")) != NULL)
{
*arg1 = '\0'; /* terminate so we get only program name */
post_opts = pg_strdup(arg1 + 1); /* point past whitespace */
}
if (exec_path == NULL)
exec_path = pg_strdup(optline);
}
/* Free the results of readfile. */
free_readfile(optlines);
}
}
}
/*
* SIGINT signal handler used while waiting for postmaster to start up.
* Forwards the SIGINT to the postmaster process, asking it to shut down,
* before terminating pg_ctl itself. This way, if the user hits CTRL-C while
* waiting for the server to start up, the server launch is aborted.
*/
static void
trap_sigint_during_startup(int sig)
{
if (postmasterPID != -1)
{
if (kill(postmasterPID, SIGINT) != 0)
write_stderr(_("%s: could not send stop signal (PID: %ld): %s\n"),
progname, (pgpid_t) postmasterPID, strerror(errno));
}
/*
* Clear the signal handler, and send the signal again, to terminate the
* process as normal.
*/
pqsignal(SIGINT, SIG_DFL);
raise(SIGINT);
}
static char *
find_other_exec_or_die(const char *argv0, const char *target, const char *versionstr)
{
int ret;
char *found_path;
found_path = pg_malloc(MAXPGPATH);
if ((ret = find_other_exec(argv0, target, versionstr, found_path)) < 0)
{
char full_path[MAXPGPATH];
if (find_my_exec(argv0, full_path) < 0)
strlcpy(full_path, progname, sizeof(full_path));
if (ret == -1)
write_stderr(_("The program \"%s\" is needed by %s "
"but was not found in the\n"
"same directory as \"%s\".\n"
"Check your installation.\n"),
target, progname, full_path);
else
write_stderr(_("The program \"%s\" was found by \"%s\"\n"
"but was not the same version as %s.\n"
"Check your installation.\n"),
target, full_path, progname);
exit(1);
}
return found_path;
}
static void
do_init(void)
{
char cmd[MAXPGPATH];
if (exec_path == NULL)
exec_path = find_other_exec_or_die(argv0, "initdb", "initdb (PostgreSQL) " PG_VERSION "\n");
if (pgdata_opt == NULL)
pgdata_opt = "";
if (post_opts == NULL)
post_opts = "";
if (!silent_mode)
snprintf(cmd, MAXPGPATH, "\"%s\" %s%s",
exec_path, pgdata_opt, post_opts);
else
snprintf(cmd, MAXPGPATH, "\"%s\" %s%s > \"%s\"",
exec_path, pgdata_opt, post_opts, DEVNULL);
if (system(cmd) != 0)
{
write_stderr(_("%s: database system initialization failed\n"), progname);
exit(1);
}
}
static void
do_start(void)
{
pgpid_t old_pid = 0;
pgpid_t pm_pid;
if (ctl_command != RESTART_COMMAND)
{
old_pid = get_pgpid(false);
if (old_pid != 0)
write_stderr(_("%s: another server might be running; "
"trying to start server anyway\n"),
progname);
}
read_post_opts();
/* No -D or -D already added during server start */
if (ctl_command == RESTART_COMMAND || pgdata_opt == NULL)
pgdata_opt = "";
if (exec_path == NULL)
exec_path = find_other_exec_or_die(argv0, "postgres", PG_BACKEND_VERSIONSTR);
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_CORE)
if (allow_core_files)
unlimit_core_size();
#endif
/*
* If possible, tell the postmaster our parent shell's PID (see the
* comments in CreateLockFile() for motivation). Windows hasn't got
* getppid() unfortunately.
*/
#ifndef WIN32
{
static char env_var[32];
snprintf(env_var, sizeof(env_var), "PG_GRANDPARENT_PID=%d",
(int) getppid());
putenv(env_var);
}
#endif
pm_pid = start_postmaster();
if (do_wait)
{
/*
* If the user interrupts the startup (e.g. with CTRL-C), we'd like to
* abort the server launch. Install a signal handler that will
* forward SIGINT to the postmaster process, while we wait.
*
* (We don't bother to reset the signal handler after the launch, as
* we're about to exit, anyway.)
*/
postmasterPID = pm_pid;
pqsignal(SIGINT, trap_sigint_during_startup);
print_msg(_("waiting for server to start..."));
switch (wait_for_postmaster(pm_pid, false))
{
case POSTMASTER_READY:
print_msg(_(" done\n"));
print_msg(_("server started\n"));
break;
case POSTMASTER_STILL_STARTING:
print_msg(_(" stopped waiting\n"));
write_stderr(_("%s: server did not start in time\n"),
progname);
exit(1);
break;
case POSTMASTER_FAILED:
print_msg(_(" stopped waiting\n"));
write_stderr(_("%s: could not start server\n"
"Examine the log output.\n"),
progname);
exit(1);
break;
}
}
else
print_msg(_("server starting\n"));
#ifdef WIN32
/* Now we don't need the handle to the shell process anymore */
CloseHandle(postmasterProcess);
postmasterProcess = INVALID_HANDLE_VALUE;
#endif
}
static void
do_stop(void)
{
int cnt;
pgpid_t pid;
struct stat statbuf;
pid = get_pgpid(false);
if (pid == 0) /* no pid file */
{
write_stderr(_("%s: PID file \"%s\" does not exist\n"), progname, pid_file);
write_stderr(_("Is server running?\n"));
exit(1);
}
else if (pid < 0) /* standalone backend, not postmaster */
{
pid = -pid;
write_stderr(_("%s: cannot stop server; "
"single-user server is running (PID: %ld)\n"),
progname, pid);
exit(1);
}
if (kill((pid_t) pid, sig) != 0)
{
write_stderr(_("%s: could not send stop signal (PID: %ld): %s\n"), progname, pid,
strerror(errno));
exit(1);
}
if (!do_wait)
{
print_msg(_("server shutting down\n"));
return;
}
else
{
/*
* If backup_label exists, an online backup is running. Warn the user
* that smart shutdown will wait for it to finish. However, if the
* server is in archive recovery, we're recovering from an online
* backup instead of performing one.
*/
if (shutdown_mode == SMART_MODE &&
stat(backup_file, &statbuf) == 0 &&
get_control_dbstate() != DB_IN_ARCHIVE_RECOVERY)
{
print_msg(_("WARNING: online backup mode is active\n"
"Shutdown will not complete until pg_stop_backup() is called.\n\n"));
}
print_msg(_("waiting for server to shut down..."));
for (cnt = 0; cnt < wait_seconds * WAITS_PER_SEC; cnt++)
{
if ((pid = get_pgpid(false)) != 0)
{
if (cnt % WAITS_PER_SEC == 0)
print_msg(".");
pg_usleep(USEC_PER_SEC / WAITS_PER_SEC);
}
else
break;
}