nixpkgs/pkgs/development/compilers/llvm/6/sanitizers-nongnu.patch

From 7b4b3333a2718628b1d510ec1d8438ad67308299 Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Fri, 29 Jun 2018 09:48:59 -0500
Subject: [PATCH] Ported to 6.0, taken from gentoo-musl project.

------
Ported to compiler-rt-sanitizers-5.0.0. Taken from

https://gist.githubusercontent.com/pwaller/2337f3290f12634cad3e3730cff0a6c1/raw/83c87a8585e2f9662494db5662e5361beb093c26/nongnu.patch
Signed-off-by: Jory A. Pratt <anarchy@gentoo.org>

Taken from gentoo-musl project, with a few additional minor fixes.
---
 lib/asan/asan_linux.cc                        |  4 +-
 lib/interception/interception_linux.cc        |  2 +-
 lib/interception/interception_linux.h         |  3 +-
 lib/msan/msan_linux.cc                        |  2 +-
 lib/sanitizer_common/sanitizer_allocator.cc   |  2 +-
 .../sanitizer_common_interceptors_ioctl.inc   |  4 +-
 .../sanitizer_common_syscalls.inc             |  2 +-
 lib/sanitizer_common/sanitizer_linux.cc       |  8 +++-
 .../sanitizer_linux_libcdep.cc                | 10 ++---
 lib/sanitizer_common/sanitizer_platform.h     |  6 +++
 .../sanitizer_platform_interceptors.h         |  4 +-
 .../sanitizer_platform_limits_posix.cc        | 37 +++++++++++--------
 lib/tsan/rtl/tsan_platform_linux.cc           |  2 +-
 13 files changed, 51 insertions(+), 35 deletions(-)

diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 625f32d40..73cf77aca 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -46,7 +46,7 @@
 #include <link.h>
 #endif
 
-#if SANITIZER_ANDROID || SANITIZER_FREEBSD || SANITIZER_SOLARIS
+#if SANITIZER_ANDROID || SANITIZER_FREEBSD || SANITIZER_SOLARIS || SANITIZER_NONGNU
 #include <ucontext.h>
 extern "C" void* _DYNAMIC;
 #elif SANITIZER_NETBSD
@@ -139,7 +139,7 @@ void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
   UNIMPLEMENTED();
 }
 
-#if SANITIZER_ANDROID
+#if SANITIZER_ANDROID || SANITIZER_NONGNU
 // FIXME: should we do anything for Android?
 void AsanCheckDynamicRTPrereqs() {}
 void AsanCheckIncompatibleRT() {}
diff --git a/lib/interception/interception_linux.cc b/lib/interception/interception_linux.cc
index c991550a4..2b706418b 100644
--- a/lib/interception/interception_linux.cc
+++ b/lib/interception/interception_linux.cc
@@ -43,7 +43,7 @@ bool GetRealFunctionAddress(const char *func_name, uptr *func_addr,
 }
 
 // Android and Solaris do not have dlvsym
-#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS
+#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS && !SANITIZER_NONGNU
 void *GetFuncAddrVer(const char *func_name, const char *ver) {
   return dlvsym(RTLD_NEXT, func_name, ver);
 }
diff --git a/lib/interception/interception_linux.h b/lib/interception/interception_linux.h
index 98fe51b85..c13302b98 100644
--- a/lib/interception/interception_linux.h
+++ b/lib/interception/interception_linux.h
@@ -35,8 +35,7 @@ void *GetFuncAddrVer(const char *func_name, const char *ver);
       (::__interception::uptr) & (func),                                   \
       (::__interception::uptr) & WRAP(func))
 
-// Android and Solaris do not have dlvsym
-#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS
+#if !SANITIZER_ANDROID && !SANITIZER_SOLARIS && !SANITIZER_NONGNU
 #define INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver) \
   (::__interception::real_##func = (func##_f)(                \
        unsigned long)::__interception::GetFuncAddrVer(#func, symver))
diff --git a/lib/msan/msan_linux.cc b/lib/msan/msan_linux.cc
index 4e6321fcb..4d50feb82 100644
--- a/lib/msan/msan_linux.cc
+++ b/lib/msan/msan_linux.cc
@@ -13,7 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD
+#if SANITIZER_FREEBSD || (SANITIZER_LINUX && !SANITIZER_NONGNU) || SANITIZER_NETBSD
 
 #include "msan.h"
 #include "msan_thread.h"
diff --git a/lib/sanitizer_common/sanitizer_allocator.cc b/lib/sanitizer_common/sanitizer_allocator.cc
index fc4f7a75a..76cf4f769 100644
--- a/lib/sanitizer_common/sanitizer_allocator.cc
+++ b/lib/sanitizer_common/sanitizer_allocator.cc
@@ -23,7 +23,7 @@ namespace __sanitizer {
 
 // ThreadSanitizer for Go uses libc malloc/free.
 #if SANITIZER_GO || defined(SANITIZER_USE_MALLOC)
-# if SANITIZER_LINUX && !SANITIZER_ANDROID
+# if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 extern "C" void *__libc_malloc(uptr size);
 #  if !SANITIZER_GO
 extern "C" void *__libc_memalign(uptr alignment, uptr size);
diff --git a/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc b/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
index 24e7548a5..20259b1d6 100644
--- a/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
+++ b/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
@@ -102,7 +102,7 @@ static void ioctl_table_fill() {
   _(SIOCGETVIFCNT, WRITE, struct_sioc_vif_req_sz);
 #endif
 
-#if SANITIZER_LINUX
+#if SANITIZER_LINUX && !SANITIZER_NONGNU
   // Conflicting request ids.
   // _(CDROMAUDIOBUFSIZ, NONE, 0);
   // _(SNDCTL_TMR_CONTINUE, NONE, 0);
@@ -363,7 +363,7 @@ static void ioctl_table_fill() {
   _(VT_WAITACTIVE, NONE, 0);
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   // _(SIOCDEVPLIP, WRITE, struct_ifreq_sz); // the same as EQL_ENSLAVE
   _(CYGETDEFTHRESH, WRITE, sizeof(int));
   _(CYGETDEFTIMEOUT, WRITE, sizeof(int));
diff --git a/lib/sanitizer_common/sanitizer_common_syscalls.inc b/lib/sanitizer_common/sanitizer_common_syscalls.inc
index 469c8eb7e..24f87867d 100644
--- a/lib/sanitizer_common/sanitizer_common_syscalls.inc
+++ b/lib/sanitizer_common/sanitizer_common_syscalls.inc
@@ -2038,7 +2038,7 @@ POST_SYSCALL(setrlimit)(long res, long resource, void *rlim) {
   }
 }
 
-#if !SANITIZER_ANDROID
+#if !SANITIZER_ANDROID && !SANITIZER_NONGNU
 PRE_SYSCALL(prlimit64)(long pid, long resource, const void *new_rlim,
                        void *old_rlim) {
   if (new_rlim) PRE_READ(new_rlim, struct_rlimit64_sz);
diff --git a/lib/sanitizer_common/sanitizer_linux.cc b/lib/sanitizer_common/sanitizer_linux.cc
index 6c83e8db4..542c4fe64 100644
--- a/lib/sanitizer_common/sanitizer_linux.cc
+++ b/lib/sanitizer_common/sanitizer_linux.cc
@@ -522,13 +522,13 @@ const char *GetEnv(const char *name) {
 #endif
 }
 
-#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_NONGNU
 extern "C" {
   SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
 }
 #endif
 
-#if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD
+#if (!SANITIZER_GO || SANITIZER_NONGNU) && !SANITIZER_FREEBSD && !SANITIZER_NETBSD
 static void ReadNullSepFileToArray(const char *path, char ***arr,
                                    int arr_size) {
   char *buff;
@@ -569,6 +569,10 @@ static void GetArgsAndEnv(char ***argv, char ***envp) {
 #elif SANITIZER_NETBSD
   *argv = __ps_strings->ps_argvstr;
   *argv = __ps_strings->ps_envstr;
+#elif SANITIZER_NONGNU
+    static const int kMaxArgv = 2000, kMaxEnvp = 2000;
+    ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
+    ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
 #else
 #if !SANITIZER_GO
   if (&__libc_stack_end) {
diff --git a/lib/sanitizer_common/sanitizer_linux_libcdep.cc b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
index 56fdfc870..a932d5db1 100644
--- a/lib/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -174,7 +174,7 @@ bool SanitizerGetThreadName(char *name, int max_len) {
 }
 
 #if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO && \
-    !SANITIZER_NETBSD && !SANITIZER_SOLARIS
+    !SANITIZER_NETBSD && !SANITIZER_SOLARIS && !SANITIZER_NONGNU
 static uptr g_tls_size;
 
 #ifdef __i386__
@@ -207,7 +207,7 @@ void InitTlsSize() { }
 
 #if (defined(__x86_64__) || defined(__i386__) || defined(__mips__) \
     || defined(__aarch64__) || defined(__powerpc64__) || defined(__s390__) \
-    || defined(__arm__)) && SANITIZER_LINUX && !SANITIZER_ANDROID
+    || defined(__arm__)) && SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 // sizeof(struct pthread) from glibc.
 static atomic_uintptr_t kThreadDescriptorSize;
 
@@ -391,7 +391,7 @@ int GetSizeFromHdr(struct dl_phdr_info *info, size_t size, void *data) {
 
 #if !SANITIZER_GO
 static void GetTls(uptr *addr, uptr *size) {
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 # if defined(__x86_64__) || defined(__i386__) || defined(__s390__)
   *addr = ThreadSelf();
   *size = GetTlsSize();
@@ -432,7 +432,7 @@ static void GetTls(uptr *addr, uptr *size) {
       *addr = (uptr)tcb->tcb_dtv[1];
     }
   }
-#elif SANITIZER_ANDROID
+#elif SANITIZER_ANDROID || SANITIZER_NONGNU
   *addr = 0;
   *size = 0;
 #elif SANITIZER_SOLARIS
@@ -448,7 +448,7 @@ static void GetTls(uptr *addr, uptr *size) {
 #if !SANITIZER_GO
 uptr GetTlsSize() {
 #if SANITIZER_FREEBSD || SANITIZER_ANDROID || SANITIZER_NETBSD || \
-    SANITIZER_SOLARIS
+    SANITIZER_SOLARIS || SANITIZER_NONGNU
   uptr addr, size;
   GetTls(&addr, &size);
   return size;
diff --git a/lib/sanitizer_common/sanitizer_platform.h b/lib/sanitizer_common/sanitizer_platform.h
index 334903c26..fc2afac2c 100644
--- a/lib/sanitizer_common/sanitizer_platform.h
+++ b/lib/sanitizer_common/sanitizer_platform.h
@@ -195,6 +195,12 @@
 # define SANITIZER_SOLARIS32 0
 #endif
 
+#if defined(__linux__) && !defined(__GLIBC__)
+# define SANITIZER_NONGNU 1
+#else
+# define SANITIZER_NONGNU 0
+#endif
+
 // By default we allow to use SizeClassAllocator64 on 64-bit platform.
 // But in some cases (e.g. AArch64's 39-bit address space) SizeClassAllocator64
 // does not work well and we need to fallback to SizeClassAllocator32.
diff --git a/lib/sanitizer_common/sanitizer_platform_interceptors.h b/lib/sanitizer_common/sanitizer_platform_interceptors.h
index b99ac4480..628d226a1 100644
--- a/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -38,7 +38,7 @@
 # include "sanitizer_platform_limits_solaris.h"
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 # define SI_LINUX_NOT_ANDROID 1
 #else
 # define SI_LINUX_NOT_ANDROID 0
@@ -291,7 +291,7 @@
   (SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID)
 #define SANITIZER_INTERCEPT_ETHER_R (SI_FREEBSD || SI_LINUX_NOT_ANDROID)
 #define SANITIZER_INTERCEPT_SHMCTL                       \
-  (SI_NETBSD || SI_SOLARIS || ((SI_FREEBSD || SI_LINUX_NOT_ANDROID) && \
+  (SI_NETBSD || SI_SOLARIS || ((SI_FREEBSD || SI_LINUX_NOT_ANDROID || SANITIZER_NONGNU) && \
                  SANITIZER_WORDSIZE == 64))  // NOLINT
 #define SANITIZER_INTERCEPT_RANDOM_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PTHREAD_ATTR_GET SI_POSIX
diff --git a/lib/sanitizer_common/sanitizer_platform_limits_posix.cc b/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
index feb7bad6f..4e89ab2a6 100644
--- a/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ b/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -14,6 +14,9 @@
 
 #include "sanitizer_platform.h"
 
+// Workaround musl <--> linux conflicting definition of 'struct sysinfo'
+#define _LINUX_SYSINFO_H
+
 #if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_MAC
 // Tests in this file assume that off_t-dependent data structures match the
 // libc ABI. For example, struct dirent here is what readdir() function (as
@@ -138,12 +141,14 @@ typedef struct user_fpregs elf_fpregset_t;
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
 #include <glob.h>
-#include <obstack.h>
+#  if !SANITIZER_NONGNU
+#    include <obstack.h>
+#  endif
 #include <mqueue.h>
-#include <net/if_ppp.h>
-#include <netax25/ax25.h>
-#include <netipx/ipx.h>
-#include <netrom/netrom.h>
+#include <linux/if_ppp.h>
+#include <linux/ax25.h>
+#include <linux/ipx.h>
+#include <linux/netrom.h>
 #if HAVE_RPC_XDR_H
 # include <rpc/xdr.h>
 #elif HAVE_TIRPC_RPC_XDR_H
@@ -251,7 +256,7 @@ namespace __sanitizer {
   unsigned struct_itimerspec_sz = sizeof(struct itimerspec);
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   // Use pre-computed size of struct ustat to avoid <sys/ustat.h> which
   // has been removed from glibc 2.28.
 #if defined(__aarch64__) || defined(__s390x__) || defined (__mips64) \
@@ -322,7 +327,7 @@ unsigned struct_ElfW_Phdr_sz = sizeof(ElfW(Phdr));
 unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
 #endif
 
-#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   int glob_nomatch = GLOB_NOMATCH;
   int glob_altdirfunc = GLOB_ALTDIRFUNC;
 #endif
@@ -416,7 +421,7 @@ unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
   unsigned struct_termios_sz = sizeof(struct termios);
   unsigned struct_winsize_sz = sizeof(struct winsize);
 
-#if SANITIZER_LINUX
+#if SANITIZER_LINUX && !SANITIZER_NONGNU
   unsigned struct_arpreq_sz = sizeof(struct arpreq);
   unsigned struct_cdrom_msf_sz = sizeof(struct cdrom_msf);
   unsigned struct_cdrom_multisession_sz = sizeof(struct cdrom_multisession);
@@ -466,7 +471,7 @@ unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
   unsigned struct_vt_mode_sz = sizeof(struct vt_mode);
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   unsigned struct_ax25_parms_struct_sz = sizeof(struct ax25_parms_struct);
   unsigned struct_cyclades_monitor_sz = sizeof(struct cyclades_monitor);
 #if EV_VERSION > (0x010000)
@@ -834,7 +839,7 @@ unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
   unsigned IOCTL_VT_WAITACTIVE = VT_WAITACTIVE;
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   unsigned IOCTL_CYGETDEFTHRESH = CYGETDEFTHRESH;
   unsigned IOCTL_CYGETDEFTIMEOUT = CYGETDEFTIMEOUT;
   unsigned IOCTL_CYGETMON = CYGETMON;
@@ -989,7 +994,7 @@ CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_phdr);
 CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_phnum);
 #endif // SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 CHECK_TYPE_SIZE(glob_t);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_pathc);
 CHECK_SIZE_AND_OFFSET(glob_t, gl_pathv);
@@ -1023,6 +1028,7 @@ CHECK_TYPE_SIZE(iovec);
 CHECK_SIZE_AND_OFFSET(iovec, iov_base);
 CHECK_SIZE_AND_OFFSET(iovec, iov_len);
 
+#if !SANITIZER_NONGNU
 CHECK_TYPE_SIZE(msghdr);
 CHECK_SIZE_AND_OFFSET(msghdr, msg_name);
 CHECK_SIZE_AND_OFFSET(msghdr, msg_namelen);
@@ -1036,6 +1042,7 @@ CHECK_TYPE_SIZE(cmsghdr);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_len);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
 CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
+#endif
 
 COMPILER_CHECK(sizeof(__sanitizer_dirent) <= sizeof(dirent));
 CHECK_SIZE_AND_OFFSET(dirent, d_ino);
@@ -1138,7 +1145,7 @@ CHECK_SIZE_AND_OFFSET(mntent, mnt_passno);
 
 CHECK_TYPE_SIZE(ether_addr);
 
-#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID
+#if (SANITIZER_LINUX || SANITIZER_FREEBSD) && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 CHECK_TYPE_SIZE(ipc_perm);
 # if SANITIZER_FREEBSD
 CHECK_SIZE_AND_OFFSET(ipc_perm, key);
@@ -1199,7 +1206,7 @@ CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_dstaddr);
 CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_data);
 #endif
 
-#if SANITIZER_LINUX
+#if SANITIZER_LINUX && !SANITIZER_NONGNU
 COMPILER_CHECK(sizeof(__sanitizer_mallinfo) == sizeof(struct mallinfo));
 #endif
 
@@ -1249,7 +1256,7 @@ COMPILER_CHECK(__sanitizer_XDR_DECODE == XDR_DECODE);
 COMPILER_CHECK(__sanitizer_XDR_FREE == XDR_FREE);
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 COMPILER_CHECK(sizeof(__sanitizer_FILE) <= sizeof(FILE));
 CHECK_SIZE_AND_OFFSET(FILE, _flags);
 CHECK_SIZE_AND_OFFSET(FILE, _IO_read_ptr);
@@ -1268,7 +1275,7 @@ CHECK_SIZE_AND_OFFSET(FILE, _chain);
 CHECK_SIZE_AND_OFFSET(FILE, _fileno);
 #endif
 
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
 COMPILER_CHECK(sizeof(__sanitizer__obstack_chunk) <= sizeof(_obstack_chunk));
 CHECK_SIZE_AND_OFFSET(_obstack_chunk, limit);
 CHECK_SIZE_AND_OFFSET(_obstack_chunk, prev);
diff --git a/lib/tsan/rtl/tsan_platform_linux.cc b/lib/tsan/rtl/tsan_platform_linux.cc
index e14d5f575..389a3bc88 100644
--- a/lib/tsan/rtl/tsan_platform_linux.cc
+++ b/lib/tsan/rtl/tsan_platform_linux.cc
@@ -285,7 +285,7 @@ void InitializePlatform() {
 // This is required to properly "close" the fds, because we do not see internal
 // closes within glibc. The code is a pure hack.
 int ExtractResolvFDs(void *state, int *fds, int nfd) {
-#if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_NONGNU
   int cnt = 0;
   struct __res_state *statp = (struct __res_state*)state;
   for (int i = 0; i < MAXNS && cnt < nfd; i++) {
-- 
2.18.0