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authorRich Felker <dalias@aerifal.cx>2012-05-12 23:45:07 -0400
committerRich Felker <dalias@aerifal.cx>2012-05-12 23:45:07 -0400
commite68c51ac46a9f273927aef8dcebc89912ab19ece (patch)
tree908d275523ca6e4a336769a3a5fc4d12ff788df6
parent3777f5b90d25b2cafc5fd7be57580f1925fb5515 (diff)
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use __h_errno_location for h_errno
we do not bother making h_errno thread-local since the only interfaces
that use it are inherently non-thread-safe. but still use the
potentially-thread-local ABI to access it just to avoid lock-in.
-rw-r--r--include/netdb.h6
-rw-r--r--src/network/h_errno.c8
-rw-r--r--src/network/res_query.c1
3 files changed, 14 insertions, 1 deletions
diff --git a/include/netdb.h b/include/netdb.h
index a480d82f..33b7a0ab 100644
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -128,7 +128,11 @@ struct hostent *gethostbyaddr (const void *, socklen_t, int);
 int gethostbyaddr_r(const void *, socklen_t, int, struct hostent *, char *, size_t, struct hostent **, int *);
 int getservbyport_r(int, const char *, struct servent *, char *, size_t, struct servent **);
 int getservbyname_r(const char *, const char *, struct servent *, char *, size_t, struct servent **);
-extern int h_errno;
+#ifdef __GNUC__
+__attribute__((const))
+#endif
+int *__h_errno_location(void);
+#define h_errno (*__h_errno_location())
 #define EAI_NODATA     -5
 #define EAI_ADDRFAMILY -9
 #define EAI_INPROGRESS -100
diff --git a/src/network/h_errno.c b/src/network/h_errno.c
index 73ead046..5560234c 100644
--- a/src/network/h_errno.c
+++ b/src/network/h_errno.c
@@ -1 +1,9 @@
+#include <netdb.h>
+
+#undef h_errno;
 int h_errno;
+
+int *__h_errno_location(void)
+{
+	return &h_errno;
+}
diff --git a/src/network/res_query.c b/src/network/res_query.c
index 42009992..c3ad1090 100644
--- a/src/network/res_query.c
+++ b/src/network/res_query.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <netdb.h>
 #include "__dns.h"
 #include "libc.h"