1 files changed, 170 insertions, 0 deletions
diff --git a/mysys/my_win_popen.cc b/mysys/my_win_popen.cc
new file mode 100644
index 00000000..f41f5410
--- /dev/null
+++ b/mysys/my_win_popen.cc
@@ -0,0 +1,170 @@
+/* 2019, MariaDB Corporation.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/*
+ Replacement of the buggy implementations of popen in Windows CRT
+*/
+#include <windows.h>
+#include <fcntl.h>
+#include <io.h>
+#include <mutex>
+#include <stdlib.h>
+#include <unordered_map>
+
+enum
+{
+  REDIRECT_STDIN= 'w',
+  REDIRECT_STDOUT= 'r'
+};
+
+/** Map from FILE* returned by popen() to corresponding process handle.*/
+static std::unordered_map<FILE *, HANDLE> popen_map;
+/* Mutex to protect the map.*/
+static std::mutex popen_mtx;
+
+/**
+Creates a FILE* from HANDLE.
+*/
+static FILE *make_fp(HANDLE *handle, const char *mode)
+{
+  int flags = 0;
+
+  if (mode[0] == REDIRECT_STDOUT)
+    flags |= O_RDONLY;
+  switch (mode[1])
+  {
+  case 't':
+    flags |= _O_TEXT;
+    break;
+  case 'b':
+    flags |= _O_BINARY;
+    break;
+  }
+
+  int fd= _open_osfhandle((intptr_t) *handle, flags);
+  if (fd < 0)
+    return NULL;
+  FILE *fp= fdopen(fd, mode);
+  if (!fp)
+  {
+    /* Closing file descriptor also closes underlying handle.*/
+    close(fd);
+    *handle= 0;
+  }
+  return fp;
+}
+
+/** A home-backed version of popen(). */
+extern "C" FILE *my_win_popen(const char *cmd, const char *mode)
+{
+  FILE *fp(0);
+  char type= mode[0];
+  HANDLE parent_pipe_end(0);
+  HANDLE child_pipe_end(0);
+  PROCESS_INFORMATION pi{};
+  STARTUPINFO si{};
+  std::string command_line;
+
+  /* Create a pipe between this and child process.*/
+  SECURITY_ATTRIBUTES sa_attr{};
+  sa_attr.nLength= sizeof(SECURITY_ATTRIBUTES);
+  sa_attr.bInheritHandle= TRUE;
+  switch (type)
+  {
+  case REDIRECT_STDIN:
+    if (!CreatePipe(&child_pipe_end, &parent_pipe_end, &sa_attr, 0))
+      goto error;
+    break;
+  case REDIRECT_STDOUT:
+    if (!CreatePipe(&parent_pipe_end, &child_pipe_end, &sa_attr, 0))
+      goto error;
+    break;
+  default:
+    /* Unknown mode, éxpected "r", "rt", "w", "wt" */
+    abort();
+  }
+  if (!SetHandleInformation(parent_pipe_end, HANDLE_FLAG_INHERIT, 0))
+    goto error;
+
+  /* Start child process with redirected output.*/
+
+  si.cb= sizeof(STARTUPINFO);
+  si.hStdError= GetStdHandle(STD_ERROR_HANDLE);
+  si.hStdOutput= (type == REDIRECT_STDOUT) ? child_pipe_end
+                                           : GetStdHandle(STD_OUTPUT_HANDLE);
+  si.hStdInput= (type == REDIRECT_STDIN) ? child_pipe_end
+                                         : GetStdHandle(STD_INPUT_HANDLE);
+
+  si.dwFlags|= STARTF_USESTDHANDLES;
+  command_line.append("cmd.exe /c ").append(cmd);
+
+  if (!CreateProcess(0, (LPSTR) command_line.c_str(), 0, 0, TRUE, 0, 0, 0, &si,
+                     &pi))
+    goto error;
+
+  CloseHandle(pi.hThread);
+  CloseHandle(child_pipe_end);
+  child_pipe_end= 0;
+
+  fp= make_fp(&parent_pipe_end, mode);
+  if (fp)
+  {
+    std::unique_lock<std::mutex> lk(popen_mtx);
+    popen_map[fp]= pi.hProcess;
+    return fp;
+  }
+
+error:
+  for (auto handle : { parent_pipe_end, child_pipe_end })
+  {
+    if (handle)
+      CloseHandle(handle);
+  }
+
+  if (pi.hProcess)
+  {
+    TerminateProcess(pi.hProcess, 1);
+    CloseHandle(pi.hProcess);
+  }
+  return NULL;
+}
+
+/** A home-backed version of pclose(). */
+
+extern "C" int my_win_pclose(FILE *fp)
+{
+  /* Find process entry for given file pointer.*/
+  std::unique_lock<std::mutex> lk(popen_mtx);
+  HANDLE proc= popen_map[fp];
+  if (!proc)
+  {
+    errno= EINVAL;
+    return -1;
+  }
+  popen_map.erase(fp);
+  lk.unlock();
+
+  fclose(fp);
+
+  /* Wait for process to complete, return its exit code.*/
+  DWORD ret;
+  if (WaitForSingleObject(proc, INFINITE) || !GetExitCodeProcess(proc, &ret))
+  {
+    ret= -1;
+    errno= EINVAL;
+  }
+  CloseHandle(proc);
+  return ret;
+}