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authorThe Android Open Source Project <initial-contribution@android.com>2008-10-21 07:00:00 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2008-10-21 07:00:00 -0700
commita27d2baa0c1a2ec70f47ea9199b1dd6762c8a349 (patch)
treedefd1cc07d16ad2f3b21154114e092d11c94c5bb /libc/resolv_static.h
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Initial Contributionandroid-1.0
Diffstat (limited to 'libc/resolv_static.h')
-rw-r--r--libc/resolv_static.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/libc/resolv_static.h b/libc/resolv_static.h
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--- /dev/null
+++ b/libc/resolv_static.h
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+#ifndef _RESOLV_STATIC_H
+#define _RESOLV_STATIC_H
+
+#include <netdb.h>
+
+/* this structure contains all the variables that were declared
+ * 'static' in the original NetBSD resolver code.
+ *
+ * this caused vast amounts of crashes and memory corruptions
+ * when the resolver was being used by multiple threads.
+ *
+ * (note: the OpenBSD/FreeBSD resolver has similar 'issues')
+ */
+
+#define MAXALIASES 35
+#define MAXADDRS 35
+
+typedef struct res_static {
+ char* h_addr_ptrs[MAXADDRS + 1];
+ char* host_aliases[MAXALIASES];
+ char hostbuf[8*1024];
+ u_int32_t host_addr[16 / sizeof(u_int32_t)]; /* IPv4 or IPv6 */
+ FILE* hostf;
+ int stayopen;
+ const char* servent_ptr;
+ struct servent servent;
+ struct hostent host;
+} *res_static;
+
+extern res_static __res_get_static(void);
+
+#endif /* _RESOLV_STATIC_H */