diff --git a/test/gtest-extra-test.cc b/test/gtest-extra-test.cc
index dfa13364..a9a8a4d4 100644
--- a/test/gtest-extra-test.cc
+++ b/test/gtest-extra-test.cc
@@ -65,8 +65,8 @@ class SuppressAssert {
 
 // Fix "secure" warning about using fopen without defining
 // _CRT_SECURE_NO_WARNINGS.
-std::FILE *OpenFile(const char *filename, const char *mode) {
-  std::FILE *f = 0;
+FILE *OpenFile(const char *filename, const char *mode) {
+  FILE *f = 0;
   errno = fopen_s(&f, filename, mode);
   return f;
 }
diff --git a/test/gtest-extra.cc b/test/gtest-extra.cc
index 5486aef7..a218803b 100644
--- a/test/gtest-extra.cc
+++ b/test/gtest-extra.cc
@@ -46,10 +46,6 @@
 
 #endif  // _WIN32
 
-#ifdef FMT_INCLUDE_POSIX_TEST
-# include "posix-test.h"
-#endif
-
 // Retries the expression while it evaluates to -1 and error equals to EINTR.
 #define FMT_RETRY(result, expression) \
   do { \
@@ -60,6 +56,7 @@ namespace {
 #ifdef _WIN32
 // On Windows the count argument to read and write is unsigned, so convert
 // it from size_t preventing integer overflow.
+// TODO: test
 inline unsigned ConvertRWCount(std::size_t count) {
   return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
 }
@@ -83,7 +80,7 @@ void BufferedFile::close() {
 }
 
 int BufferedFile::fileno() const {
-  int fd = ::FMT_POSIX(fileno(file_));
+  int fd = FMT_POSIX_CALL(fileno(file_));
   if (fd == -1)
     fmt::ThrowSystemError(errno, "cannot get file descriptor");
   return fd;
@@ -93,9 +90,9 @@ File::File(const char *path, int oflag) {
   int mode = S_IRUSR | S_IWUSR;
 #ifdef _WIN32
   fd_ = -1;
-  _sopen_s(&fd_, path, oflag, _SH_DENYNO, mode);
+  FMT_POSIX_CALL(sopen_s(&fd_, path, oflag, _SH_DENYNO, mode));
 #else
-  FMT_RETRY(fd_, open(path, oflag, mode));
+  FMT_RETRY(fd_, FMT_POSIX_CALL(open(path, oflag, mode)));
 #endif
   if (fd_ == -1)
     fmt::ThrowSystemError(errno, "cannot open file {}") << path;
@@ -104,7 +101,7 @@ File::File(const char *path, int oflag) {
 File::~File() FMT_NOEXCEPT(true) {
   // Don't retry close in case of EINTR!
   // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
-  if (fd_ != -1 && ::FMT_POSIX(close(fd_)) != 0)
+  if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)
     fmt::ReportSystemError(errno, "cannot close file");
 }
 
@@ -113,7 +110,7 @@ void File::close() {
     return;
   // Don't retry close in case of EINTR!
   // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
-  int result = ::FMT_POSIX(close(fd_));
+  int result = FMT_POSIX_CALL(close(fd_));
   fd_ = -1;
   if (result != 0)
     fmt::ThrowSystemError(errno, "cannot close file");
@@ -121,7 +118,7 @@ void File::close() {
 
 std::streamsize File::read(void *buffer, std::size_t count) {
   std::streamsize result = 0;
-  FMT_RETRY(result, ::FMT_POSIX(read(fd_, buffer, ConvertRWCount(count))));
+  FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, ConvertRWCount(count))));
   if (result == -1)
     fmt::ThrowSystemError(errno, "cannot read from file");
   return result;
@@ -129,7 +126,7 @@ std::streamsize File::read(void *buffer, std::size_t count) {
 
 std::streamsize File::write(const void *buffer, std::size_t count) {
   std::streamsize result = 0;
-  FMT_RETRY(result, ::FMT_POSIX(write(fd_, buffer, ConvertRWCount(count))));
+  FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, ConvertRWCount(count))));
   if (result == -1)
     fmt::ThrowSystemError(errno, "cannot write to file");
   return result;
@@ -137,7 +134,7 @@ std::streamsize File::write(const void *buffer, std::size_t count) {
 
 File File::dup(int fd) {
   int new_fd = 0;
-  FMT_RETRY(new_fd, ::FMT_POSIX(dup(fd)));
+  FMT_RETRY(new_fd, FMT_POSIX_CALL(dup(fd)));
   if (new_fd == -1)
     fmt::ThrowSystemError(errno, "cannot duplicate file descriptor {}") << fd;
   return File(new_fd);
@@ -145,7 +142,7 @@ File File::dup(int fd) {
 
 void File::dup2(int fd) {
   int result = 0;
-  FMT_RETRY(result, ::FMT_POSIX(dup2(fd_, fd)));
+  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
   if (result == -1) {
     fmt::ThrowSystemError(errno,
         "cannot duplicate file descriptor {} to {}") << fd_ << fd;
@@ -154,7 +151,7 @@ void File::dup2(int fd) {
 
 void File::dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT(true) {
   int result = 0;
-  FMT_RETRY(result, ::FMT_POSIX(dup2(fd_, fd)));
+  FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
   if (result == -1)
     ec = ErrorCode(errno);
 }
@@ -182,7 +179,7 @@ void File::pipe(File &read_end, File &write_end) {
 }
 
 BufferedFile File::fdopen(const char *mode) {
-  BufferedFile f(::FMT_POSIX(fdopen(fd_, mode)));
+  BufferedFile f(FMT_POSIX_CALL(fdopen(fd_, mode)));
   fd_ = -1;
   return f;
 }
@@ -206,7 +203,7 @@ void OutputRedirect::Restore() {
   original_.close();
 }
 
-OutputRedirect::OutputRedirect(std::FILE *file) : file_(file) {
+OutputRedirect::OutputRedirect(FILE *file) : file_(file) {
   Flush();
   int fd = FMT_POSIX(fileno(file));
   // Create a File object referring to the original file.
diff --git a/test/gtest-extra.h b/test/gtest-extra.h
index 2e2b4c0e..f5649b71 100644
--- a/test/gtest-extra.h
+++ b/test/gtest-extra.h
@@ -29,10 +29,11 @@
 #define FMT_GTEST_EXTRA_H
 
 #include <cstddef>
-#include <cstdio>
 #include <ios>
 #include <string>
 
+#include <stdio.h>
+
 #if FMT_USE_FILE_DESCRIPTORS
 # include <fcntl.h>
 #endif
@@ -41,6 +42,10 @@
 
 #include "format.h"
 
+#ifdef FMT_INCLUDE_POSIX_TEST
+# include "posix-test.h"
+#endif
+
 #define FMT_TEST_THROW_(statement, expected_exception, expected_message, fail) \
   GTEST_AMBIGUOUS_ELSE_BLOCKER_ \
   if (::testing::AssertionResult gtest_ar = ::testing::AssertionSuccess()) { \
@@ -93,11 +98,22 @@ std::string FormatSystemErrorMessage(int error_code, fmt::StringRef message);
 
 #if FMT_USE_FILE_DESCRIPTORS
 
-#ifdef _WIN32
+#ifndef FMT_POSIX
+# ifdef _WIN32
 // Fix warnings about deprecated symbols.
-# define FMT_POSIX(name) _##name
-#else
-# define FMT_POSIX(name) name
+#  define FMT_POSIX(name) _##name
+# else
+#  define FMT_POSIX(name) name
+# endif
+#endif
+
+#ifndef FMT_POSIX_CALL
+# ifdef _WIN32
+// Fix warnings about deprecated symbols.
+#  define FMT_POSIX_CALL(name) ::_##name
+# else
+#  define FMT_POSIX_CALL(name) ::name
+# endif
 #endif
 
 // An error code.
@@ -114,11 +130,11 @@ class ErrorCode {
 // A buffered file.
 class BufferedFile {
  private:
-  std::FILE *file_;
+  FILE *file_;
 
   friend class File;
 
-  explicit BufferedFile(std::FILE *f) : file_(f) {}
+  explicit BufferedFile(FILE *f) : file_(f) {}
 
  public:
   // Constructs a BufferedFile object which doesn't represent any file.
@@ -135,7 +151,7 @@ class BufferedFile {
   // A proxy object to emulate a move constructor.
   // It is private to make it impossible call operator Proxy directly.
   struct Proxy {
-    std::FILE *file;
+    FILE *file;
   };
 
  public:
@@ -190,7 +206,7 @@ class BufferedFile {
   void close();
 
   // Returns the pointer to a FILE object representing this file.
-  std::FILE *get() const { return file_; }
+  FILE *get() const { return file_; }
 
   int fileno() const;
 };
@@ -329,7 +345,7 @@ inline File &move(File &f) { return f; }
 // The output it can handle is limited by the pipe capacity.
 class OutputRedirect {
  private:
-  std::FILE *file_;
+  FILE *file_;
   File original_;  // Original file passed to redirector.
   File read_end_;  // Read end of the pipe where the output is redirected.
 
@@ -339,7 +355,7 @@ class OutputRedirect {
   void Restore();
 
  public:
-  explicit OutputRedirect(std::FILE *file);
+  explicit OutputRedirect(FILE *file);
   ~OutputRedirect() FMT_NOEXCEPT(true);
 
   // Restores the original file, reads output from the pipe into a string
diff --git a/test/posix-test.cc b/test/posix-test.cc
index e714d987..a8f16891 100644
--- a/test/posix-test.cc
+++ b/test/posix-test.cc
@@ -27,8 +27,6 @@
 
 #include "posix-test.h"
 
-#undef open
-
 #include <errno.h>
 #include <fcntl.h>
 
@@ -36,29 +34,84 @@
 
 namespace {
 int open_count;
+int close_count;
+int dup_count;
+int dup2_count;
+int fdopen_count;
+int fileno_count;
+int read_count;
+int write_count;
 }
 
+#define EMULATE_EINTR(func, error_result) \
+  if (func##_count != 0) { \
+    if (func##_count++ != 3) { \
+      errno = EINTR; \
+      return error_result; \
+    } \
+  }
+
 #ifndef _WIN32
 int test::open(const char *path, int oflag, int mode) {
-  if ((open_count++ % 3) == 2)
-    return ::open(path, oflag, mode);
-  errno = EINTR;
-  return -1;
+  EMULATE_EINTR(open, -1);
+  return ::open(path, oflag, mode);
 }
 #else
-errno_t test::sopen_s(int* pfh, const char *filename, int oflag, int shflag, int pmode) {
+errno_t test::sopen_s(
+    int* pfh, const char *filename, int oflag, int shflag, int pmode) {
+  EMULATE_EINTR(open, EINTR);
   return _sopen_s(pfh, filename, oflag, shflag, pmode);
 }
 #endif
 
+int test::close(int fildes) {
+  // Close the file first because close shouldn't be retried.
+  int result = ::close(fildes);
+  EMULATE_EINTR(close, -1);
+  return result;
+}
+
+int test::dup(int fildes) {
+  EMULATE_EINTR(dup, -1);
+  return ::dup(fildes);
+}
+
+int test::dup2(int fildes, int fildes2) {
+  EMULATE_EINTR(dup2, -1);
+  return ::dup2(fildes, fildes2);
+}
+
+FILE *test::fdopen(int fildes, const char *mode) {
+  EMULATE_EINTR(fdopen, 0);
+  return ::fdopen(fildes, mode);
+}
+
+int test::fileno(FILE *stream) {
+  EMULATE_EINTR(fileno, -1);
+  return ::fileno(stream);
+}
+
+test::ssize_t test::read(int fildes, void *buf, test::size_t nbyte) {
+  EMULATE_EINTR(read, -1);
+  return ::read(fildes, buf, nbyte);
+}
+
+test::ssize_t test::write(int fildes, const void *buf, test::size_t nbyte) {
+  EMULATE_EINTR(write, -1);
+  return ::write(fildes, buf, nbyte);
+}
+
 #ifndef _WIN32
 # define EXPECT_RETRY(statement, func, message) \
-    func##_count = 0; \
+    func##_count = 1; \
     statement; \
-    EXPECT_EQ(3, func##_count);
+    EXPECT_EQ(4, func##_count); \
+    func##_count = 0;
 #else
 # define EXPECT_RETRY(statement, func, message) \
-    EXPECT_SYSTEM_ERROR(statement, EINTR, message);
+    func##_count = 1; \
+    EXPECT_SYSTEM_ERROR(statement, EINTR, message); \
+    func##_count = 0;
 #endif
 
 TEST(FileTest, OpenRetry) {
diff --git a/test/posix-test.h b/test/posix-test.h
index 89924f95..11d2124f 100644
--- a/test/posix-test.h
+++ b/test/posix-test.h
@@ -29,17 +29,35 @@
 #define FMT_POSIX_TEST_H
 
 #include <errno.h>
+#include <stdio.h>
 
 namespace test {
 
 #ifndef _WIN32
+// Size type for read and write.
+typedef size_t size_t;
+typedef ssize_t ssize_t;
 int open(const char *path, int oflag, int mode);
-#define open test::open
 #else
-errno_t sopen_s(int* pfh, const char *filename, int oflag, int shflag, int pmode);
-#define _sopen_s test::sopen_s
+typedef unsigned size_t;
+typedef int ssize_t;
+errno_t sopen_s(
+    int* pfh, const char *filename, int oflag, int shflag, int pmode);
 #endif
 
+int close(int fildes);
+
+int dup(int fildes);
+int dup2(int fildes, int fildes2);
+
+FILE *fdopen(int fildes, const char *mode);
+int fileno(FILE *stream);
+
+ssize_t read(int fildes, void *buf, size_t nbyte);
+ssize_t write(int fildes, const void *buf, size_t nbyte);
+
 }  // namespace test
 
+#define FMT_POSIX_CALL(call) test::call
+
 #endif  // FMT_POSIX_TEST_H