On Fri, Mar 7, 2014 at 7:59 PM, Bruce Momjian <[email protected]> wrote:
> On Fri, Mar 7, 2014 at 07:18:04PM +0530, Amit Kapila wrote:
>> > OK, done with the attached patch Three is returned for status, but one
>> > for other cases.
>>
>> I think it would have been better if it return status as 4 for cases where
>> directory/file is not accessible (current new cases added by this patch).
>>
>> I think status 3 should be only return only when the data directory is valid
>> and pid file is missing, because in script after getting this code, the next
>> thing they will probably do is to start the server which doesn't seem a
>> good fit for newly added cases.
>
> OK, I have updated the attached patch to reflect this, and added a C
> comment.
This is fine, do you think we should mention about this in docs?
I have added one line in docs (updated patch attached), if you think
it makes sense then add it otherwise ignore it.
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
diff --git a/doc/src/sgml/ref/pg_ctl-ref.sgml b/doc/src/sgml/ref/pg_ctl-ref.sgml
index 45b53ce..99cb176 100644
--- a/doc/src/sgml/ref/pg_ctl-ref.sgml
+++ b/doc/src/sgml/ref/pg_ctl-ref.sgml
@@ -206,9 +206,10 @@ PostgreSQL documentation
<para>
<option>status</option> mode checks whether a server is running in
the specified data directory. If it is, the <acronym>PID</acronym>
- and the command line options that were used to invoke it are
- displayed. If the server is not running, the process returns an
- exit status of 3.
+ and the command line options that were used to invoke it are
+ displayed. If the server is not running, the process returns an
+ exit status of 3. If the specified data directory is not accessible,
+ the process returns an exit status of 4.
</para>
<para>
diff --git a/src/bin/pg_ctl/pg_ctl.c b/src/bin/pg_ctl/pg_ctl.c
index 0dbaa6e..56d238f 100644
--- a/src/bin/pg_ctl/pg_ctl.c
+++ b/src/bin/pg_ctl/pg_ctl.c
@@ -97,6 +97,7 @@ 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 recovery_file[MAXPGPATH];
@@ -152,7 +153,7 @@ static void pgwin32_doRunAsService(void);
static int CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION
*processInfo, bool as_service);
#endif
-static pgpid_t get_pgpid(void);
+static pgpid_t get_pgpid(bool is_status_request);
static char **readfile(const char *path);
static void free_readfile(char **optlines);
static int start_postmaster(void);
@@ -246,10 +247,34 @@ print_msg(const char *msg)
}
static pgpid_t
-get_pgpid(void)
+get_pgpid(bool is_status_request)
{
FILE *pidf;
long pid;
+ struct stat statbuf;
+
+ if (stat(pg_data, &statbuf) != 0)
+ {
+ if (errno == ENOENT)
+ printf(_("%s: directory \"%s\" does not exist\n"),
progname,
+ pg_data);
+ else
+ printf(_("%s: cannot access directory \"%s\"\n"),
progname,
+ pg_data);
+ /*
+ * 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)
+ {
+ printf(_("%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)
@@ -810,7 +835,7 @@ do_start(void)
if (ctl_command != RESTART_COMMAND)
{
- old_pid = get_pgpid();
+ old_pid = get_pgpid(false);
if (old_pid != 0)
write_stderr(_("%s: another server might be running; "
"trying to start server
anyway\n"),
@@ -894,7 +919,7 @@ do_stop(void)
pgpid_t pid;
struct stat statbuf;
- pid = get_pgpid();
+ pid = get_pgpid(false);
if (pid == 0) /* no pid file */
{
@@ -943,7 +968,7 @@ do_stop(void)
for (cnt = 0; cnt < wait_seconds; cnt++)
{
- if ((pid = get_pgpid()) != 0)
+ if ((pid = get_pgpid(false)) != 0)
{
print_msg(".");
pg_usleep(1000000); /* 1 sec */
@@ -980,7 +1005,7 @@ do_restart(void)
pgpid_t pid;
struct stat statbuf;
- pid = get_pgpid();
+ pid = get_pgpid(false);
if (pid == 0) /* no pid file */
{
@@ -1033,7 +1058,7 @@ do_restart(void)
for (cnt = 0; cnt < wait_seconds; cnt++)
{
- if ((pid = get_pgpid()) != 0)
+ if ((pid = get_pgpid(false)) != 0)
{
print_msg(".");
pg_usleep(1000000); /* 1 sec */
@@ -1071,7 +1096,7 @@ do_reload(void)
{
pgpid_t pid;
- pid = get_pgpid();
+ pid = get_pgpid(false);
if (pid == 0) /* no pid file */
{
write_stderr(_("%s: PID file \"%s\" does not exist\n"),
progname, pid_file);
@@ -1110,7 +1135,7 @@ do_promote(void)
pgpid_t pid;
struct stat statbuf;
- pid = get_pgpid();
+ pid = get_pgpid(false);
if (pid == 0) /* no pid file */
{
@@ -1204,7 +1229,7 @@ do_status(void)
{
pgpid_t pid;
- pid = get_pgpid();
+ pid = get_pgpid(true);
/* Is there a pid file? */
if (pid != 0)
{
@@ -1247,7 +1272,7 @@ do_status(void)
/*
* The Linux Standard Base Core Specification 3.1 says this should
return
- * '3'
+ * '3, program is not running'
*
https://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
*/
exit(3);
@@ -2285,6 +2310,7 @@ main(int argc, char **argv)
if (pg_data)
{
snprintf(postopts_file, MAXPGPATH, "%s/postmaster.opts",
pg_data);
+ snprintf(version_file, MAXPGPATH, "%s/PG_VERSION", pg_data);
snprintf(pid_file, MAXPGPATH, "%s/postmaster.pid", pg_data);
snprintf(backup_file, MAXPGPATH, "%s/backup_label", pg_data);
snprintf(recovery_file, MAXPGPATH, "%s/recovery.conf", pg_data);
--
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