resolv: new module

2 files changed, 33 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index b740a6c..784babc 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,7 @@ LIBGCOMPAT_SRC = \
 	libgcompat/math.c		\
 	libgcompat/pthread.c		\
 	libgcompat/pwd.c		\
+	libgcompat/resolv.c		\
 	libgcompat/resource.c		\
 	libgcompat/setjmp.c		\
 	libgcompat/stdio.c		\
diff --git a/libgcompat/resolv.c b/libgcompat/resolv.c
new file mode 100644
index 0000000..9ded8c9
--- /dev/null
+++ b/libgcompat/resolv.c
@@ -0,0 +1,32 @@
+/* Original author: Khem Raj <raj.khem@gmail.com> */
+/***************************************************************************
+ * resolv_compat.h
+ *
+ * Mimick GLIBC's res_ninit() and res_nclose() for musl libc
+ * Note: res_init() is actually deprecated according to
+ * http://docs.oracle.com/cd/E36784_01/html/E36875/res-nclose-3resolv.html
+ **************************************************************************/
+#include <string.h>	/* memcpy, memset */
+#include <resolv.h>	/* res_state */
+
+static inline int res_ninit(res_state statp)
+{
+	int rc = res_init();
+	if (statp != &_res) {
+		memcpy(statp, &_res, sizeof(*statp));
+	}
+	return rc;
+}
+
+static inline int res_nclose(res_state statp)
+{
+	if (!statp)
+		return -1;
+	if (statp != &_res) {
+		memset(statp, 0, sizeof(*statp));
+	}
+	return 0;
+}
+
+extern __typeof(res_ninit) __res_ninit __attribute__((weak, alias("res_ninit")));
+extern __typeof(res_nclose) __res_nclose __attribute__((weak, alias("res_nclose")));