path: root/src/network/res_send.c
diff options
authorRich Felker <>2014-06-02 02:13:57 -0400
committerRich Felker <>2014-06-02 02:13:57 -0400
commit8312f7f60f9dfe88118163d38b8282abf04aac2f (patch)
tree0dcbcbd3f9e6b3362a920707895624bdc3adb1f5 /src/network/res_send.c
parent1871f583f419f58bbcd921cda41c991994672c8a (diff)
implement new dns backend, res_send and other legacy resolver functions
this is the second phase of the "resolver overhaul" project. the key additions in this commit are the __res_msend and __res_mkquery functions, which have been factored so as to provide a backend for both the legacy res_* functions and the standard getaddrinfo and getnameinfo functions. the latter however are still using the old backend code; there is code duplication which still needs to be removed, and this will be the next phase of the resolver overhaul. __res_msend is derived from the old __dns_doqueries function, but generalized to send arbitrary caller-provided packets in parallel rather than producing the parallel queries itself. this allows it to be used (completely trivially) as a backend for res_send. the factored-out query generation code, with slightly more generality, is now part of __res_mkquery.
Diffstat (limited to 'src/network/res_send.c')
1 files changed, 12 insertions, 0 deletions
diff --git a/src/network/res_send.c b/src/network/res_send.c
new file mode 100644
index 00000000..19cfe0f6
--- /dev/null
+++ b/src/network/res_send.c
@@ -0,0 +1,12 @@
+#include <resolv.h>
+#include "libc.h"
+int __res_msend(int, const unsigned char *const *, const int *, unsigned char *const *, int *, int);
+int __res_send(const unsigned char *msg, int msglen, unsigned char *answer, int anslen)
+ int r = __res_msend(1, &msg, &msglen, &answer, &anslen, anslen);
+ return r<0 ? r : anslen;
+weak_alias(__res_send, res_send);