* [committed] libstdc++: Improve error handling in Net TS name resolution
@ 2021-08-31 16:38 Jonathan Wakely
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From: Jonathan Wakely @ 2021-08-31 16:38 UTC (permalink / raw)
To: libstdc++, gcc-patches
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Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
* include/experimental/internet (__make_resolver_error_code):
Handle EAI_SYSTEM errors.
(basic_resolver_results): Use __make_resolver_error_code. Use
Glibc NI_MAXHOST and NI_MAXSERV values for buffer sizes.
Tested powerpc64le-linux. Committed to trunk.
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commit feec7ef6672bf28d5c79950a21d435533a10710d
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Aug 31 13:09:26 2021
libstdc++: Improve error handling in Net TS name resolution
Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
* include/experimental/internet (__make_resolver_error_code):
Handle EAI_SYSTEM errors.
(basic_resolver_results): Use __make_resolver_error_code. Use
Glibc NI_MAXHOST and NI_MAXSERV values for buffer sizes.
diff --git a/libstdc++-v3/include/experimental/internet b/libstdc++-v3/include/experimental/internet
index 6ce070ae775..65c97de07d9 100644
--- a/libstdc++-v3/include/experimental/internet
+++ b/libstdc++-v3/include/experimental/internet
@@ -89,6 +89,12 @@ namespace ip
host_not_found = EAI_NONAME,
host_not_found_try_again = EAI_AGAIN,
service_not_found = EAI_SERVICE
+ // N.B. POSIX defines additional errors that have no enumerator here:
+ // EAI_BADFLAGS, EAI_FAIL, EAI_FAMILY, EAI_MEMORY, EAI_SOCKTYPE, EAI_SYSTEM
+ // Some C libraries define additional errors:
+ // EAI_BADHINTS, EAI_OVERFLOW, EAI_PROTOCOL
+ // Some C libraries define additional (obsolete?) errors:
+ // EAI_ADDRFAMILY, EAI_NODATA
#endif
};
@@ -117,6 +123,19 @@ namespace ip
inline error_condition make_error_condition(resolver_errc __e) noexcept
{ return error_condition(static_cast<int>(__e), resolver_category()); }
+ /// @cond undocumented
+ inline error_code
+ __make_resolver_error_code(int __ai_err,
+ [[__maybe_unused__]] int __sys_err) noexcept
+ {
+#ifdef EAI_SYSTEM
+ if (__builtin_expect(__ai_err == EAI_SYSTEM, 0))
+ return error_code(__sys_err, std::generic_category());
+#endif
+ return error_code(__ai_err, resolver_category());
+ }
+ /// @endcond
+
/// @}
using port_type = uint_least16_t; ///< Type used for port numbers.
@@ -2011,7 +2030,7 @@ namespace ip
if (int __err = ::getaddrinfo(__h, __s, &__hints, &__sai._M_p))
{
- __ec.assign(__err, resolver_category());
+ __ec = ip::__make_resolver_error_code(__err, errno);
return;
}
__ec.clear();
@@ -2040,8 +2059,8 @@ namespace ip
basic_resolver_results(const endpoint_type& __ep, error_code& __ec)
{
#ifdef _GLIBCXX_HAVE_NETDB_H
- char __host_name[256];
- char __service_name[128];
+ char __host_name[1025]; // glibc NI_MAXHOST
+ char __service_name[32]; // glibc NI_MAXSERV
int __flags = 0;
if (__ep.protocol().type() == SOCK_DGRAM)
__flags |= NI_DGRAM;
@@ -2059,7 +2078,7 @@ namespace ip
__flags);
}
if (__err)
- __ec.assign(__err, resolver_category());
+ __ec = ip::__make_resolver_error_code(__err, errno);
else
{
__ec.clear();
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