diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/url.c | 69 |
1 files changed, 32 insertions, 37 deletions
@@ -185,6 +185,11 @@ static void flush_cookies(struct SessionHandle *data, int cleanup); /* not for WIN32 builds */ #ifdef SIGALRM +/* + * This signal handler jumps back into the main libcurl code and continues + * execution. This effectively causes the remainder of the application to run + * within a signal handler which is nonportable and could lead to problems. + */ static RETSIGTYPE alarmfunc(int sig) { @@ -3796,8 +3801,8 @@ static CURLcode resolve_server(struct SessionHandle *data, bool *async) { CURLcode result=CURLE_OK; -#ifndef USE_ARES -#ifdef SIGALRM + +#if defined(HAVE_ALARM) && defined(SIGALRM) && !defined(USE_ARES) #ifdef HAVE_SIGACTION struct sigaction keep_sigact; /* store the old struct here */ bool keep_copysig=FALSE; /* did copy it? */ @@ -3806,45 +3811,16 @@ static CURLcode resolve_server(struct SessionHandle *data, void (*keep_sigact)(int); /* store the old handler here */ #endif /* HAVE_SIGNAL */ #endif /* HAVE_SIGACTION */ -#endif /* SIGALRM */ -#endif /* USE_ARES */ -#if defined(HAVE_ALARM) && !defined(USE_ARES) unsigned int prev_alarm=0; -#endif -#ifndef USE_ARES /************************************************************* * Set timeout if that is being used, and we're not using an asynchronous * name resolve. *************************************************************/ if((data->set.timeout || data->set.connecttimeout) && !data->set.no_signal) { - /************************************************************* - * Set signal handler to catch SIGALRM - * Store the old value to be able to set it back later! - *************************************************************/ - -#ifdef SIGALRM -#ifdef HAVE_ALARM - long shortest; -#endif #ifdef HAVE_SIGACTION struct sigaction sigact; - sigaction(SIGALRM, NULL, &sigact); - keep_sigact = sigact; - keep_copysig = TRUE; /* yes, we have a copy */ - sigact.sa_handler = alarmfunc; -#ifdef SA_RESTART - /* HPUX doesn't have SA_RESTART but defaults to that behaviour! */ - sigact.sa_flags &= ~SA_RESTART; -#endif - /* now set the new struct */ - sigaction(SIGALRM, &sigact, NULL); -#else /* HAVE_SIGACTION */ - /* no sigaction(), revert to the much lamer signal() */ -#ifdef HAVE_SIGNAL - keep_sigact = signal(SIGALRM, alarmfunc); -#endif #endif /* HAVE_SIGACTION */ /* We set the timeout on the name resolving phase first, separately from @@ -3852,8 +3828,7 @@ static CURLcode resolve_server(struct SessionHandle *data, * a signal-based timeout, why it won't work and shouldn't be used in * multi-threaded environments. */ -#ifdef HAVE_ALARM - shortest = data->set.timeout; /* default to this timeout value */ + long shortest = data->set.timeout; /* default to this timeout value */ if(shortest && data->set.connecttimeout && (data->set.connecttimeout < shortest)) /* if both are set, pick the shortest */ @@ -3867,16 +3842,36 @@ static CURLcode resolve_server(struct SessionHandle *data, we want to wait less than one second we must bail out already now. */ return CURLE_OPERATION_TIMEDOUT; + /************************************************************* + * Set signal handler to catch SIGALRM + * Store the old value to be able to set it back later! + *************************************************************/ +#ifdef HAVE_SIGACTION + sigaction(SIGALRM, NULL, &sigact); + keep_sigact = sigact; + keep_copysig = TRUE; /* yes, we have a copy */ + sigact.sa_handler = alarmfunc; +#ifdef SA_RESTART + /* HPUX doesn't have SA_RESTART but defaults to that behaviour! */ + sigact.sa_flags &= ~SA_RESTART; +#endif + /* now set the new struct */ + sigaction(SIGALRM, &sigact, NULL); +#else /* HAVE_SIGACTION */ + /* no sigaction(), revert to the much lamer signal() */ +#ifdef HAVE_SIGNAL + keep_sigact = signal(SIGALRM, alarmfunc); +#endif +#endif /* HAVE_SIGACTION */ + /* alarm() makes a signal get sent when the timeout fires off, and that will abort system calls */ prev_alarm = alarm((unsigned int) (shortest ? shortest/1000L : shortest)); /* We can expect the conn->created time to be "now", as that was just recently set in the beginning of this function and nothing slow has been done since then until now. */ -#endif -#endif /* SIGALRM */ } -#endif /* USE_ARES */ +#endif /* HAVE_ALARM && SIGALRM && !USE_ARES */ /************************************************************* * Resolve the name of the server or proxy @@ -3975,7 +3970,7 @@ static CURLcode resolve_server(struct SessionHandle *data, else alarm(0); /* just shut it off */ } -#endif +#endif /* HAVE_ALARM && SIGALRM && !USE_ARES */ return result; } |