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https://github.com/moparisthebest/curl
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simplify code of Curl_resolv_timeout()
This commit is contained in:
Kamil Dudka
parent
64ac64e783
commit
7425db3fab
122
lib/hostip.c
122
lib/hostip.c
@ -564,50 +564,52 @@ int Curl_resolv_timeout(struct connectdata *conn,
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else
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timeout = timeoutms;
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if(timeout && timeout < 1000)
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if(!timeout)
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/* USE_ALARM_TIMEOUT defined, but no timeout actually requested */
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return Curl_resolv(conn, hostname, port, entry);
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if(timeout < 1000)
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/* The alarm() function only provides integer second resolution, so if
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we want to wait less than one second we must bail out already now. */
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return CURLRESOLV_TIMEDOUT;
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if (timeout > 0) {
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/*************************************************************
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* Set signal handler to catch SIGALRM
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* Store the old value to be able to set it back later!
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*************************************************************/
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/*************************************************************
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* Set signal handler to catch SIGALRM
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* Store the old value to be able to set it back later!
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*************************************************************/
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#ifdef HAVE_SIGACTION
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sigaction(SIGALRM, NULL, &sigact);
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keep_sigact = sigact;
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keep_copysig = TRUE; /* yes, we have a copy */
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sigact.sa_handler = alarmfunc;
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sigaction(SIGALRM, NULL, &sigact);
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keep_sigact = sigact;
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keep_copysig = TRUE; /* yes, we have a copy */
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sigact.sa_handler = alarmfunc;
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#ifdef SA_RESTART
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/* HPUX doesn't have SA_RESTART but defaults to that behaviour! */
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sigact.sa_flags &= ~SA_RESTART;
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/* HPUX doesn't have SA_RESTART but defaults to that behaviour! */
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sigact.sa_flags &= ~SA_RESTART;
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#endif
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/* now set the new struct */
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sigaction(SIGALRM, &sigact, NULL);
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/* now set the new struct */
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sigaction(SIGALRM, &sigact, NULL);
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#else /* HAVE_SIGACTION */
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/* no sigaction(), revert to the much lamer signal() */
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/* no sigaction(), revert to the much lamer signal() */
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#ifdef HAVE_SIGNAL
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keep_sigact = signal(SIGALRM, alarmfunc);
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keep_sigact = signal(SIGALRM, alarmfunc);
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#endif
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#endif /* HAVE_SIGACTION */
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/* alarm() makes a signal get sent when the timeout fires off, and that
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will abort system calls */
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prev_alarm = alarm((unsigned int) (timeout/1000L));
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/* alarm() makes a signal get sent when the timeout fires off, and that
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will abort system calls */
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prev_alarm = alarm((unsigned int) (timeout/1000L));
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/* This allows us to time-out from the name resolver, as the timeout
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will generate a signal and we will siglongjmp() from that here.
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This technique has problems (see alarmfunc).
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This should be the last thing we do before calling Curl_resolv(),
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as otherwise we'd have to worry about variables that get modified
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before we invoke Curl_resolv() (and thus use "volatile"). */
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if(sigsetjmp(curl_jmpenv, 1)) {
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/* this is coming from a siglongjmp() after an alarm signal */
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failf(data, "name lookup timed out");
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rc = CURLRESOLV_ERROR;
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goto clean_up;
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}
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/* This allows us to time-out from the name resolver, as the timeout
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will generate a signal and we will siglongjmp() from that here.
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This technique has problems (see alarmfunc).
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This should be the last thing we do before calling Curl_resolv(),
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as otherwise we'd have to worry about variables that get modified
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before we invoke Curl_resolv() (and thus use "volatile"). */
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if(sigsetjmp(curl_jmpenv, 1)) {
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/* this is coming from a siglongjmp() after an alarm signal */
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failf(data, "name lookup timed out");
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rc = CURLRESOLV_ERROR;
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goto clean_up;
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}
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#else
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@ -627,46 +629,44 @@ int Curl_resolv_timeout(struct connectdata *conn,
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#ifdef USE_ALARM_TIMEOUT
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clean_up:
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if (timeout > 0) {
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if(!prev_alarm)
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/* deactivate a possibly active alarm before uninstalling the handler */
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alarm(0);
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if(!prev_alarm)
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/* deactivate a possibly active alarm before uninstalling the handler */
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alarm(0);
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#ifdef HAVE_SIGACTION
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if(keep_copysig) {
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/* we got a struct as it looked before, now put that one back nice
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and clean */
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sigaction(SIGALRM, &keep_sigact, NULL); /* put it back */
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}
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if(keep_copysig) {
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/* we got a struct as it looked before, now put that one back nice
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and clean */
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sigaction(SIGALRM, &keep_sigact, NULL); /* put it back */
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}
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#else
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#ifdef HAVE_SIGNAL
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/* restore the previous SIGALRM handler */
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signal(SIGALRM, keep_sigact);
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/* restore the previous SIGALRM handler */
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signal(SIGALRM, keep_sigact);
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#endif
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#endif /* HAVE_SIGACTION */
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/* switch back the alarm() to either zero or to what it was before minus
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the time we spent until now! */
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if(prev_alarm) {
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/* there was an alarm() set before us, now put it back */
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unsigned long elapsed_ms = Curl_tvdiff(Curl_tvnow(), conn->created);
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/* switch back the alarm() to either zero or to what it was before minus
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the time we spent until now! */
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if(prev_alarm) {
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/* there was an alarm() set before us, now put it back */
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unsigned long elapsed_ms = Curl_tvdiff(Curl_tvnow(), conn->created);
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/* the alarm period is counted in even number of seconds */
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unsigned long alarm_set = prev_alarm - elapsed_ms/1000;
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/* the alarm period is counted in even number of seconds */
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unsigned long alarm_set = prev_alarm - elapsed_ms/1000;
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if(!alarm_set ||
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((alarm_set >= 0x80000000) && (prev_alarm < 0x80000000)) ) {
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/* if the alarm time-left reached zero or turned "negative" (counted
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with unsigned values), we should fire off a SIGALRM here, but we
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won't, and zero would be to switch it off so we never set it to
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less than 1! */
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alarm(1);
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rc = CURLRESOLV_TIMEDOUT;
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failf(data, "Previous alarm fired off!");
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}
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else
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alarm((unsigned int)alarm_set);
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if(!alarm_set ||
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((alarm_set >= 0x80000000) && (prev_alarm < 0x80000000)) ) {
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/* if the alarm time-left reached zero or turned "negative" (counted
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with unsigned values), we should fire off a SIGALRM here, but we
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won't, and zero would be to switch it off so we never set it to
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less than 1! */
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alarm(1);
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rc = CURLRESOLV_TIMEDOUT;
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failf(data, "Previous alarm fired off!");
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}
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else
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alarm((unsigned int)alarm_set);
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}
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#endif /* USE_ALARM_TIMEOUT */
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