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Revert "Use async name resolving to improve net thread responsiveness"

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This reverts commit caf6150e97.

getaddrinfo_a has a nasty tendency to segfault internally in its
background thread, on every version of glibc I tested, especially
under helgrind.

See https://sourceware.org/bugzilla/show_bug.cgi?id=20874
This commit is contained in:
Matt Corallo 2016-12-01 14:31:38 -08:00
parent ad826b3df9
commit 10ae7a7b23
2 changed files with 1 additions and 49 deletions
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2
configure.ac
View file

@ -512,8 +512,6 @@ if test x$TARGET_OS = xdarwin; then
fi
AC_CHECK_HEADERS([endian.h sys/endian.h byteswap.h stdio.h stdlib.h unistd.h strings.h sys/types.h sys/stat.h sys/select.h sys/prctl.h])
AC_SEARCH_LIBS([getaddrinfo_a], [anl], [AC_DEFINE(HAVE_GETADDRINFO_A, 1, [Define this symbol if you have getaddrinfo_a])])
AC_SEARCH_LIBS([inet_pton], [nsl resolv], [AC_DEFINE(HAVE_INET_PTON, 1, [Define this symbol if you have inet_pton])])
AC_CHECK_DECLS([strnlen])

48
src/netbase.cpp
View file

@ -94,30 +94,9 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign
}
}
#ifdef HAVE_GETADDRINFO_A
struct in_addr ipv4_addr;
#ifdef HAVE_INET_PTON
if (inet_pton(AF_INET, pszName, &ipv4_addr) > 0) {
vIP.push_back(CNetAddr(ipv4_addr));
return true;
}
struct in6_addr ipv6_addr;
if (inet_pton(AF_INET6, pszName, &ipv6_addr) > 0) {
vIP.push_back(CNetAddr(ipv6_addr));
return true;
}
#else
ipv4_addr.s_addr = inet_addr(pszName);
if (ipv4_addr.s_addr != INADDR_NONE) {
vIP.push_back(CNetAddr(ipv4_addr));
return true;
}
#endif
#endif
struct addrinfo aiHint;
memset(&aiHint, 0, sizeof(struct addrinfo));
aiHint.ai_socktype = SOCK_STREAM;
aiHint.ai_protocol = IPPROTO_TCP;
aiHint.ai_family = AF_UNSPEC;
@ -126,33 +105,8 @@ bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsign
#else
aiHint.ai_flags = fAllowLookup ? AI_ADDRCONFIG : AI_NUMERICHOST;
#endif
struct addrinfo *aiRes = NULL;
#ifdef HAVE_GETADDRINFO_A
struct gaicb gcb, *query = &gcb;
memset(query, 0, sizeof(struct gaicb));
gcb.ar_name = pszName;
gcb.ar_request = &aiHint;
int nErr = getaddrinfo_a(GAI_NOWAIT, &query, 1, NULL);
if (nErr)
return false;
do {
// Should set the timeout limit to a reasonable value to avoid
// generating unnecessary checking call during the polling loop,
// while it can still response to stop request quick enough.
// 2 seconds looks fine in our situation.
struct timespec ts = { 2, 0 };
gai_suspend(&query, 1, &ts);
boost::this_thread::interruption_point();
nErr = gai_error(query);
if (0 == nErr)
aiRes = query->ar_result;
} while (nErr == EAI_INPROGRESS);
#else
int nErr = getaddrinfo(pszName, NULL, &aiHint, &aiRes);
#endif
if (nErr)
return false;