reactos/lib/crt/io/dup.c

   1 #include "precomp.h"
   2 #include <io.h>
   3 #include <errno.h>
   4 #include <internal/file.h>
   5
   6
   7 /*
   8  * @implemented
   9  */
  10 int _dup(int handle)
  11 {
  12   HANDLE hFile;
  13   HANDLE hProcess = GetCurrentProcess();
  14   BOOL result;
  15   int fd;
  16   int mode;
  17
  18   hFile = (HANDLE)_get_osfhandle(handle);
  19         if (hFile == INVALID_HANDLE_VALUE) {
  20                 __set_errno(EBADF);
  21                 return -1;
  22         }
  23   mode = __fileno_getmode(handle);
  24   result = DuplicateHandle(hProcess,
  25                            hFile,
  26                            hProcess,
  27                            &hFile,
  28                            0,
  29                            mode & FNOINHERIT ? FALSE : TRUE,
  30                            DUPLICATE_SAME_ACCESS);
  31         if (result == FALSE) {
  32                 _dosmaperr(GetLastError());
  33                 return -1;
  34         }
  35
  36   fd = alloc_fd(hFile, mode);
  37   if (fd < 0)
  38   {
  39           CloseHandle(hFile);
  40   }
  41   return fd;
  42 }