/* ----------------------------------------------------------------
* atexit_callback
*
* Backstop to ensure that direct calls of exit() don't mess us up.
*
* Somebody who was being really uncooperative could call _exit(),
* but for that case we have a "dead man switch" that will make the
* postmaster treat it as a crash --- see pmsignal.c.
* ----------------------------------------------------------------
*/
static void
atexit_callback(void)
{
/* Clean up everything that must be cleaned up */
/* ... too bad we don't know the real exit code ... */
proc_exit_prepare(-1);
}
/* ----------------------------------------------------------------
* proc_exit
*
* this function calls all the callbacks registered
* for it (to free resources) and then calls exit.
*
* This should be the only function to call exit().
* -cim 2/6/90
*
* Unfortunately, we can't really guarantee that add-on code
* obeys the rule of not calling exit() directly. So, while
* this is the preferred way out of the system, we also register
* an atexit callback that will make sure cleanup happens.
* ----------------------------------------------------------------
*/
void
proc_exit(int code)
{
pqsignal(SIGALRM, SIG_IGN);
/* Clean up everything that must be cleaned up */
proc_exit_prepare(code);
#ifdef PROFILE_PID_DIR
{
/*
* If we are profiling ourself then gprof's mcleanup() is about to
* write out a profile to ./gmon.out. Since mcleanup() always uses a
* fixed file name, each backend will overwrite earlier profiles. To
* fix that, we create a separate subdirectory for each backend
* (./gprof/pid) and 'cd' to that subdirectory before we exit() - that
* forces mcleanup() to write each profile into its own directory. We
* end up with something like: $PGDATA/gprof/8829/gmon.out
* $PGDATA/gprof/8845/gmon.out ...
*
* To avoid undesirable disk space bloat, autovacuum workers are
* discriminated against: all their gmon.out files go into the same
* subdirectory. Without this, an installation that is "just sitting
* there" nonetheless eats megabytes of disk space every few seconds.
*
* Note that we do this here instead of in an on_proc_exit() callback
* because we want to ensure that this code executes last - we don't
* want to interfere with any other on_proc_exit() callback. For the
* same reason, we do not include it in proc_exit_prepare ... so if
* you are exiting in the "wrong way" you won't drop your profile in a
* nice place.
*/
char gprofDirName[32];
if (IsAutoVacuumWorkerProcess())
snprintf(gprofDirName, 32, "gprof/avworker");
else
snprintf(gprofDirName, 32, "gprof/%d", (int) getpid());
mkdir("gprof", S_IRWXU | S_IRWXG | S_IRWXO);
mkdir(gprofDirName, S_IRWXU | S_IRWXG | S_IRWXO);
chdir(gprofDirName);
}
#endif
elog(DEBUG3, "exit(%d)", code);
exit(code);
}
static void
atexit_callback(int exitstatus, void *arg)
{
/* Clean up everything that must be cleaned up */
proc_exit_prepare(exitstatus);
}
