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Added signal-based resolver timeout issue

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Dan Fandrich 2008-10-14 23:52:36 +00:00
parent 2f2ed4e40e
commit 9b3f863cf5
1 changed files with 13 additions and 0 deletions
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@ -18,6 +18,7 @@
1.4 Get IP address
1.5 c-ares ipv6
1.6 configure-based info in public headers
1.7 signal-based resolver timeouts
2. libcurl - multi interface
2.1 More non-blocking
@ -161,6 +162,18 @@
The remaining problems to solve involve the platforms that can't run
configure.
1.7 signal-based resolver timeouts
libcurl built without an asynchronous resolver library uses alarm() to time
out DNS lookups. When a timeout occurs, this causes libcurl to jump from the
signal handler back into the library with a sigsetjmp, which effectively
causes libcurl to continue running within the signal handler. This is
non-portable and could cause problems on some platforms. A discussion on the
problem is available at http://curl.haxx.se/mail/lib-2008-09/0197.html
Also, alarm() provides timeout resolution only to the nearest second. alarm
ought to be replaced by setitimer on systems that support it.
2. libcurl - multi interface
2.1 More non-blocking