Add build script for symbolizer which can be linked into instrumented process.

[eugenis]

lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh

61

this comment does not make sense

68

please remove -w

132

this looks fragile
is it possible to unpack LLVM*.a instead?

137

the build should use sanitizer_symbolizer_hooks.cc in some way

[vitalybuka]

Comments

[vitalybuka]

updated

[vitalybuka]

fixed test

[vitalybuka]

Update

[eugenis]

lib/sanitizer_common/symbolizer/sanitizer_symbolize.cc

22

nullptr

lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh

16

Please update the comment.

test/asan/TestCases/Linux/print_memory_profile_test.cc

33 ↗

(On Diff #72743)

I don't understand the effect of this change.

[vitalybuka]

update

[eugenis]

LGTM

lib/sanitizer_common/symbolizer/sanitizer_symbolize.cc

22

I don't think you need this initializer at all.

[vitalybuka]

initialization

lib/sanitizer_common/symbolizer/sanitizer_symbolize.cc

+//===-- sanitizer_symbolize.cc ----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementation of weak hooks from sanitizer_symbolizer_posix_libcdep.cc.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdio.h>
+#include <string>
+
+#include "llvm/DebugInfo/Symbolize/DIPrinter.h"
+#include "llvm/DebugInfo/Symbolize/Symbolize.h"
+
+static llvm::symbolize::LLVMSymbolizer *getDefaultSymbolizer() {
+  static llvm::symbolize::LLVMSymbolizer *DefaultSymbolizer = 0;
+  if (DefaultSymbolizer == 0) {
+    DefaultSymbolizer = new llvm::symbolize::LLVMSymbolizer();
+  }
+  return DefaultSymbolizer;
+}
+
+namespace __sanitizer {
+int internal_snprintf(char *buffer, unsigned long length, const char *format,
+                      ...);
+}  // namespace __sanitizer
+
+extern "C" {
+
+typedef uint64_t u64;
+
+bool __llvm_symbolize_code(const char *ModuleName, uint64_t ModuleOffset,
+                           char *Buffer, int MaxLength) {
+  std::string Result;
+  {
+    llvm::raw_string_ostream OS(Result);
+    llvm::symbolize::DIPrinter Printer(OS);
+    auto ResOrErr =
+        getDefaultSymbolizer()->symbolizeInlinedCode(ModuleName, ModuleOffset);
+    Printer << (ResOrErr ? ResOrErr.get() : llvm::DIInliningInfo());
+  }
+  __sanitizer::internal_snprintf(Buffer, MaxLength, "%s", Result.c_str());
+  return true;
+}
+
+bool __llvm_symbolize_data(const char *ModuleName, uint64_t ModuleOffset,
+                           char *Buffer, int MaxLength) {
+  std::string Result;
+  {
+    llvm::raw_string_ostream OS(Result);
+    llvm::symbolize::DIPrinter Printer(OS);
+    auto ResOrErr =
+        getDefaultSymbolizer()->symbolizeData(ModuleName, ModuleOffset);
+    Printer << (ResOrErr ? ResOrErr.get() : llvm::DIGlobal());
+  }
+  __sanitizer::internal_snprintf(Buffer, MaxLength, "%s", Result.c_str());
+  return true;
+}
+
+void __llvm_symbolize_flush() { getDefaultSymbolizer()->flush(); }
+
+int __llvm_symbolize_demangle(const char *Name, char *Buffer, int MaxLength) {
+  std::string Result =
+      llvm::symbolize::LLVMSymbolizer::DemangleName(Name, nullptr);
+  __sanitizer::internal_snprintf(Buffer, MaxLength, "%s", Result.c_str());
+  return static_cast<int>(Result.size() + 1);
+}
+
+}  // extern "C"

lib/sanitizer_common/symbolizer/sanitizer_symbolizer_hooks.cc

+//===-- sanitizer_symbolizer_hooks.cc ---------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Hooks from sanitizer_symbolizer_posix_libcdep.cc.
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdint.h>
+
+extern "C" {
+
+bool __llvm_symbolize_code(const char *ModuleName, uint64_t ModuleOffset,
+                           char *Buffer, int MaxLength);
+bool __llvm_symbolize_data(const char *ModuleName, uint64_t ModuleOffset,
+                           char *Buffer, int MaxLength);
+void __llvm_symbolize_flush();
+int __llvm_symbolize_demangle(const char *Name, char *Buffer, int MaxLength);
+
+// Override weak functions in sanitizer runtime.
+bool __sanitizer_symbolize_code(const char *ModuleName, uint64_t ModuleOffset,
+                                char *Buffer, int MaxLength) {
+  return __llvm_symbolize_code(ModuleName, ModuleOffset, Buffer, MaxLength);
+}
+
+bool __sanitizer_symbolize_data(const char *ModuleName, uint64_t ModuleOffset,
+                                char *Buffer, int MaxLength) {
+  return __llvm_symbolize_data(ModuleName, ModuleOffset, Buffer, MaxLength);
+}
+
+void __sanitizer_symbolize_flush() { __llvm_symbolize_flush(); }
+
+int __sanitizer_symbolize_demangle(const char *Name, char *Buffer,
+                                   int MaxLength) {
+  return __llvm_symbolize_demangle(Name, Buffer, MaxLength);
+}
+
+}  // extern "C"

lib/sanitizer_common/symbolizer/sanitizer_wrappers.cc

+//===-- sanitizer_wrappers.cc -----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Redirect some functions to sanitizer interceptors.
+//
+//===----------------------------------------------------------------------===//
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <tuple>
+
+// Need to match ../sanitizer_common/sanitizer_internal_defs.h
+#if defined(ARCH_PPC)
+#define OFF_T unsigned long
+#else
+#define OFF_T unsigned long long
+#endif
+
+namespace __sanitizer {
+unsigned long internal_open(const char *filename, int flags);
+unsigned long internal_open(const char *filename, int flags, unsigned mode);
+unsigned long internal_close(int fd);
+unsigned long internal_stat(const char *path, void *buf);
+unsigned long internal_lstat(const char *path, void *buf);
+unsigned long internal_fstat(int fd, void *buf);
+size_t internal_strlen(const char *s);
+unsigned long internal_mmap(void *addr, unsigned long length, int prot,
+                            int flags, int fd, OFF_T offset);
+void *internal_memcpy(void *dest, const void *src, unsigned long n);
+// Used to propagate errno.
+bool internal_iserror(unsigned long retval, int *rverrno = 0);
+}  // namespace __sanitizer
+
+namespace {
+
+template <typename T>
+struct GetTypes;
+
+template <typename R, typename... Args>
+struct GetTypes<R(Args...)> {
+  using Result = R;
+  template <size_t i>
+  struct Arg {
+    using Type = typename std::tuple_element<i, std::tuple<Args...>>::type;
+  };
+};
+
+#define LLVM_SYMBOLIZER_GET_FUNC(Function) \
+  ((__interceptor_##Function)              \
+       ? (__interceptor_##Function)        \
+       : reinterpret_cast<decltype(&Function)>(dlsym(RTLD_NEXT, #Function)))
+
+#define LLVM_SYMBOLIZER_INTERCEPTOR1(Function, ...)               \
+  GetTypes<__VA_ARGS__>::Result __interceptor_##Function(         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type) __attribute__((weak)); \
+  GetTypes<__VA_ARGS__>::Result Function(                         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type arg0) {                 \
+    return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0);              \
+  }
+
+#define LLVM_SYMBOLIZER_INTERCEPTOR2(Function, ...)               \
+  GetTypes<__VA_ARGS__>::Result __interceptor_##Function(         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type,                        \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type) __attribute__((weak)); \
+  GetTypes<__VA_ARGS__>::Result Function(                         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type arg0,                   \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type arg1) {                 \
+    return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1);        \
+  }
+
+#define LLVM_SYMBOLIZER_INTERCEPTOR3(Function, ...)               \
+  GetTypes<__VA_ARGS__>::Result __interceptor_##Function(         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type,                        \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type,                        \
+      GetTypes<__VA_ARGS__>::Arg<2>::Type) __attribute__((weak)); \
+  GetTypes<__VA_ARGS__>::Result Function(                         \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type arg0,                   \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type arg1,                   \
+      GetTypes<__VA_ARGS__>::Arg<2>::Type arg2) {                 \
+    return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2);  \
+  }
+
+#define LLVM_SYMBOLIZER_INTERCEPTOR4(Function, ...)                    \
+  GetTypes<__VA_ARGS__>::Result __interceptor_##Function(              \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type,                             \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type,                             \
+      GetTypes<__VA_ARGS__>::Arg<2>::Type,                             \
+      GetTypes<__VA_ARGS__>::Arg<3>::Type) __attribute__((weak));      \
+  GetTypes<__VA_ARGS__>::Result Function(                              \
+      GetTypes<__VA_ARGS__>::Arg<0>::Type arg0,                        \
+      GetTypes<__VA_ARGS__>::Arg<1>::Type arg1,                        \
+      GetTypes<__VA_ARGS__>::Arg<2>::Type arg2,                        \
+      GetTypes<__VA_ARGS__>::Arg<3>::Type arg3) {                      \
+    return LLVM_SYMBOLIZER_GET_FUNC(Function)(arg0, arg1, arg2, arg3); \
+  }
+
+}  // namespace
+
+// C-style interface around internal sanitizer libc functions.
+extern "C" {
+
+// Libc++ calls these hooks from __cxa_guard_acquire. Normally, they should go
+// into google3 fiber scheduler code. But in the canned symbolizer they are
+// both unnecessary and lead to deadlocks as symbolizer calls arbitrary google3
+// code during race reporting.
+void __google_potentially_blocking_region_begin() {}
+void __google_potentially_blocking_region_end() {}
+
+#define RETURN_OR_SET_ERRNO(T, res)                   \
+  int rverrno;                                        \
+  if (__sanitizer::internal_iserror(res, &rverrno)) { \
+    errno = rverrno;                                  \
+    return (T)-1;                                     \
+  }                                                   \
+  return (T)res;
+
+int open(const char *filename, int flags, ...) {
+  unsigned long res;
+  if (flags | O_CREAT) {
+    va_list va;
+    va_start(va, flags);
+    unsigned mode = va_arg(va, unsigned);
+    va_end(va);
+    res = __sanitizer::internal_open(filename, flags, mode);
+  } else {
+    res = __sanitizer::internal_open(filename, flags);
+  }
+  RETURN_OR_SET_ERRNO(int, res);
+}
+
+int close(int fd) {
+  unsigned long res = __sanitizer::internal_close(fd);
+  RETURN_OR_SET_ERRNO(int, res);
+}
+
+#define STAT(func, arg, buf)                                  \
+  unsigned long res = __sanitizer::internal_##func(arg, buf); \
+  RETURN_OR_SET_ERRNO(int, res);
+
+int stat(const char *path, struct stat *buf) { STAT(stat, path, buf); }
+
+int lstat(const char *path, struct stat *buf) { STAT(lstat, path, buf); }
+
+int fstat(int fd, struct stat *buf) { STAT(fstat, fd, buf); }
+
+// Redirect versioned stat functions to the __sanitizer::internal() as well.
+int __xstat(int version, const char *path, struct stat *buf) {
+  STAT(stat, path, buf);
+}
+
+int __lxstat(int version, const char *path, struct stat *buf) {
+  STAT(lstat, path, buf);
+}
+
+int __fxstat(int version, int fd, struct stat *buf) { STAT(fstat, fd, buf); }
+
+size_t strlen(const char *s) { return __sanitizer::internal_strlen(s); }
+
+void *mmap(void *addr, size_t length, int prot, int flags, int fd,
+           off_t offset) {
+  unsigned long res = __sanitizer::internal_mmap(
+      addr, (unsigned long)length, prot, flags, fd, (unsigned long long)offset);
+  RETURN_OR_SET_ERRNO(void *, res);
+}
+
+LLVM_SYMBOLIZER_INTERCEPTOR3(read, ssize_t(int, void *, size_t))
+LLVM_SYMBOLIZER_INTERCEPTOR4(pread, ssize_t(int, void *, size_t, off_t))
+LLVM_SYMBOLIZER_INTERCEPTOR4(pread64, ssize_t(int, void *, size_t, off64_t))
+LLVM_SYMBOLIZER_INTERCEPTOR2(realpath, char *(const char *, char *))
+
+}  // extern "C"

lib/sanitizer_common/symbolizer/scripts/build_symbolizer.sh

+#!/bin/bash -eu
+
+# Run as: CLANG=bin/clang ZLIB_SRC=src/zlib build_symbolizer.sh
+# You can download zlib sources from http://www.zlib.net.
+
+# Script to produce perfect, entirely self-contained symbolization library
+# from libc++ and LLVM sources (and zlib, too). It internalizes symbols in these libs,
+# so that this library may be linked into arbitrary programs and be invoked
+# by Sanitizer runtime libraries to symbolize code/data in-process.
+# The output of this script is a single-file archive which
+# * includes a private copy of libc++, libz and some LLVM libs,
+# * exports nothing except for the symbolizer interface,
+# * has several libc functions redirected to sanitizer internal implementation,
+#   adding a dependency on Sanitizer runtime library.
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SRC_DIR=$(readlink -f $SCRIPT_DIR/..)
+BUILD_DIR=$(readlink -f ./symbolizer)
+mkdir -p $BUILD_DIR
+
+LLVM_SRC=$(readlink -f $SCRIPT_DIR/../../../../../..)
+
+if [[ "$LLVM_SRC" == "" ||
+      ! -d "${LLVM_SRC}/projects/libcxxabi" ||
+      ! -d "${LLVM_SRC}/projects/libcxx" ]]; then
+  echo "Missing or incomplete LLVM_SRC"
+  exit 1
+fi
+LLVM_SRC=$(readlink -f $LLVM_SRC)
+
+if [[ "$ZLIB_SRC" == ""  ||
+      ! -x "${ZLIB_SRC}/configure" ||
+      ! -f "${ZLIB_SRC}/zlib.h" ]]; then
+  echo "Missing or incomplete ZLIB_SRC"
+  exit 1
+fi
+ZLIB_SRC=$(readlink -f $ZLIB_SRC)
+
+J="${J:-50}"
+
+CLANG="${CLANG:-`which clang`}"
+CLANG_DIR=$(readlink -f $(dirname "$CLANG"))
+
+CC=$CLANG_DIR/clang
+CXX=$CLANG_DIR/clang++
+TBLGEN=$CLANG_DIR/llvm-tblgen
+LINK=$CLANG_DIR/llvm-link
+OPT=$CLANG_DIR/opt
+AR=$CLANG_DIR/llvm-ar
+
+if [[ ! -x "$CC" ||
+      ! -x "$CXX" ||
+      ! -x "$TBLGEN" ||
+      ! -x "$LINK" ||
+      ! -x "$OPT" ||
+      ! -x "$AR" ]]; then
+ echo "Missing or incomplete CLANG_DIR"
+ exit 1
+fi
+
+# libc++abi can't be built without exceptions or rtti
+ZLIB_BUILD=${BUILD_DIR}/zlib
+LIBCXX_BUILD=${BUILD_DIR}/libcxx
+LLVM_BUILD=${BUILD_DIR}/llvm
+SANITIZER_LLVM_BUILD=${BUILD_DIR}/sanitizer
+
+FLAGS=${FLAGS:-}
+FLAGS="$FLAGS -w -fPIC -flto -Os -g0 -fno-exceptions -DNDEBUG"
+
+# Build zlib.
+mkdir -p ${ZLIB_BUILD}
+cd ${ZLIB_BUILD}
+cp -r ${ZLIB_SRC}/* .
+CC=$CC CFLAGS="$FLAGS" RANLIB=/bin/true ./configure --static
+make clean
+make -j${J} libz.a
+
+# Build and install libcxxabi and libcxx.
+if [[ ! -d ${LIBCXX_BUILD} ]]; then
+  mkdir -p ${LIBCXX_BUILD}
+  cd ${LIBCXX_BUILD}
+  cmake -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_C_COMPILER=$CC \
+    -DCMAKE_CXX_COMPILER=$CXX \
+    -DCMAKE_C_FLAGS_RELEASE="${FLAGS} -I${LLVM_SRC}/projects/libcxxabi/include" \
+    -DCMAKE_CXX_FLAGS_RELEASE="${FLAGS} -I${LLVM_SRC}/projects/libcxxabi/include" \
+    -DLIBCXXABI_ENABLE_ASSERTIONS=OFF \
+    -DLIBCXXABI_ENABLE_EXCEPTIONS=OFF \
+    -DLIBCXXABI_ENABLE_SHARED=OFF \
+    -DLIBCXXABI_ENABLE_THREADS=OFF \
+    -DLIBCXX_ENABLE_ASSERTIONS=OFF \
+    -DLIBCXX_ENABLE_EXCEPTIONS=OFF \
+    -DLIBCXX_ENABLE_RTTI=OFF \
+    -DLIBCXX_ENABLE_SHARED=OFF \
+    -DLIBCXX_ENABLE_THREADS=OFF \
+  $LLVM_SRC
+fi
+cd ${LIBCXX_BUILD}
+ninja -t clean
+ninja cxx_objects cxxabi_objects
+
+# From now on, use libraries we've just built.
+FLAGS="${FLAGS} -fno-rtti -I${ZLIB_BUILD} -I${LIBCXX_BUILD}/include/c++/v1"
+
+# Build LLVM.
+if [[ ! -d ${LLVM_BUILD} ]]; then
+  mkdir -p ${LLVM_BUILD}
+  cd ${LLVM_BUILD}
+  cmake -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_C_COMPILER=$CC \
+    -DCMAKE_CXX_COMPILER=$CXX \
+    -DCMAKE_C_FLAGS_RELEASE="${FLAGS}" \
+    -DCMAKE_CXX_FLAGS_RELEASE="${FLAGS}" \
+    -DLLVM_TABLEGEN=$TBLGEN \
+    -DLLVM_ENABLE_ZLIB=ON \
+    -DLLVM_ENABLE_TERMINFO=OFF \
+    -DLLVM_ENABLE_THREADS=OFF \
+  $LLVM_SRC
+fi
+cd ${LLVM_BUILD}
+ninja -t clean
+ninja LLVMSymbolize LLVMObject LLVMDebugInfoDWARF LLVMSupport LLVMDebugInfoPDB LLVMMC
+
+cd ${BUILD_DIR}
+rm -rf ${SANITIZER_LLVM_BUILD}
+mkdir ${SANITIZER_LLVM_BUILD}
+cd ${SANITIZER_LLVM_BUILD}
+
+for F in `find ${BUILD_DIR} -type f -regex .*\\\\.o$`; do
+  ( ($LINK $F -o $(mktemp XXXXXX.o) 2>/dev/null) || (echo "skipping non-llvm: $F") ) &
+done
+wait
+
+FLAGS="$FLAGS -std=c++11 -I${LLVM_SRC}/include -I${LLVM_BUILD}/include"
+$CXX $FLAGS ${SRC_DIR}/sanitizer_symbolize.cc ${SRC_DIR}/sanitizer_wrappers.cc -c
+
+SYMBOLIZER_API_LIST=__llvm_symbolize_code,__llvm_symbolize_data,__llvm_symbolize_flush,__llvm_symbolize_demangle
+
+# Merge all the object files together and copy the resulting library back.
+$LINK *.o -o all.bc
+$OPT -internalize -internalize-public-api-list=${SYMBOLIZER_API_LIST} all.bc -o opt.bc
+$CC $FLAGS -fno-lto -c opt.bc
+$AR rcs libsymbolizer.a opt.o
+
+echo "Checking undefined symbols..."
+nm -f posix -g opt.o | cut -f 1,2 -d \  | LC_COLLATE=C sort -u > undefined.new
+(diff -u $SCRIPT_DIR/global_symbols.txt undefined.new | grep -E "^\+[^+]") && \
+  (echo "Failed: unexpected symbols"; exit 1)
+
+cp libsymbolizer.a $BUILD_DIR/..
+
+echo "Success!"

lib/sanitizer_common/symbolizer/scripts/global_symbols.txt

+_ZN11__sanitizer13internal_mmapEPvmiiiy U
+_ZN11__sanitizer13internal_openEPKcij U
+_ZN11__sanitizer13internal_statEPKcPv U
+_ZN11__sanitizer14internal_closeEi U
+_ZN11__sanitizer14internal_fstatEiPv U
+_ZN11__sanitizer14internal_lstatEPKcPv U
+_ZN11__sanitizer15internal_strlenEPKc U
+_ZN11__sanitizer16internal_iserrorEmPi U
+_ZN11__sanitizer17internal_snprintfEPcmPKcz U
+__ctype_b_loc U
+__ctype_get_mb_cur_max U
+__cxa_atexit U
+__dso_handle U
+__errno_location U
+__interceptor_pread w
+__interceptor_read w
+__interceptor_realpath w
+__llvm_symbolize_code T
+__llvm_symbolize_data T
+__llvm_symbolize_demangle T
+__llvm_symbolize_flush T
+__strdup U
+_exit U
+abort U
+access U
+calloc U
+catclose U
+catgets U
+catopen U
+ceil U
+cfgetospeed U
+dl_iterate_phdr U
+dlsym U
+dup2 U
+environ U
+execv U
+exit U
+fclose U
+fflush U
+fileno U
+fopen U
+fork U
+fprintf U
+fputc U
+free U
+freelocale U
+fwrite U
+getc U
+getcwd U
+getenv U
+getpagesize U
+getpid U
+gettimeofday U
+ioctl U
+isatty U
+isprint U
+isupper U
+isxdigit U
+log10 U
+lseek U
+malloc U
+mbrlen U
+mbrtowc U
+mbsnrtowcs U
+mbsrtowcs U
+mbtowc U
+memchr U
+memcmp U
+memcpy U
+memmove U
+memset U
+mkdir U
+munmap U
+newlocale U
+perror U
+posix_spawn U
+posix_spawn_file_actions_adddup2 U
+posix_spawn_file_actions_addopen U
+posix_spawn_file_actions_destroy U
+posix_spawn_file_actions_init U
+qsort U
+rand U
+readlink U
+realloc U
+remove U
+setvbuf U
+sigfillset U
+sigprocmask U
+snprintf U
+sprintf U
+srand U
+sscanf U
+stderr U
+stdin U
+stdout U
+strcat U
+strchr U
+strcmp U
+strcpy U
+strdup U
+strerror U
+strerror_r U
+strftime_l U
+strncmp U
+strncpy U
+strrchr U
+strsep U
+strtod_l U
+strtof_l U
+strtol U
+strtold_l U
+strtoll_l U
+strtoull_l U
+tcgetattr U
+uname U
+ungetc U
+unlink U
+uselocale U
+vasprintf U
+vfprintf U
+vsnprintf U
+vsscanf U
+waitpid U
+wcrtomb U
+wcslen U
+wcsnrtombs U
+wmemcpy U
+wmemmove U
+wmemset U
+write U