posix/lib/psxdll/fcntl/open.c

   1 /* $Id: open.c,v 1.1 2002/02/20 07:06:50 hyperion Exp $
   2  */
   3 /*
   4  * COPYRIGHT:   See COPYING in the top level directory
   5  * PROJECT:     ReactOS system libraries
   6  * FILE:        subsys/psx/lib/psxdll/fcntl/open.c
   7  * PURPOSE:     Open a file
   8  * PROGRAMMER:  KJK::Hyperion <noog@libero.it>
   9  * UPDATE HISTORY:
  10  *              04/02/2002: Created
  11  */
  12
  13 #include <ddk/ntddk.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <fcntl.h>
  17 #include <stdlib.h>
  18 #include <stdarg.h>
  19 #include <string.h>
  20 #include <psx/path.h>
  21 #include <psx/debug.h>
  22 #include <psx/errno.h>
  23 #include <psx/pdata.h>
  24
  25 int open(const char *path, int oflag, ...)
  26 {
  27  ANSI_STRING    strPath;
  28  UNICODE_STRING wstrPath;
  29  int            nRetVal;
  30
  31  RtlInitAnsiString(&strPath, (PCSZ)path);
  32  RtlAnsiStringToUnicodeString(&wstrPath, &strPath, TRUE);
  33
  34  nRetVal = _Wopen(wstrPath.Buffer, oflag);
  35
  36  RtlFreeUnicodeString(&wstrPath);
  37
  38  return (nRetVal);
  39 }
  40
  41 int _Wopen(const wchar_t *path, int oflag, ...)
  42 {
  43  OBJECT_ATTRIBUTES oaFileAttribs;
  44  IO_STATUS_BLOCK   isbStatus;
  45  UNICODE_STRING    wstrNativePath;
  46  NTSTATUS          nErrCode;
  47  ULONG             nDesiredAccess;
  48  ULONG             nCreateDisposition;
  49  ULONG             nCreateOptions;
  50  HANDLE            hFile;
  51 #if 0
  52  mode_t            mFileMode;
  53 #endif
  54  int               nFileNo;
  55  __fdtable_t      *pftTable;
  56  __fildes_t        fdDescriptor;
  57
  58  /* translate file access flag */
  59  switch(oflag & O_ACCMODE)
  60  {
  61   case O_RDONLY:
  62   {
  63    nDesiredAccess = FILE_READ_ACCESS;
  64    nCreateOptions = 0;
  65    break;
  66   }
  67
  68   case O_WRONLY:
  69   {
  70    nDesiredAccess = FILE_WRITE_ACCESS;
  71    nCreateOptions = FILE_NON_DIRECTORY_FILE; /* required by the specification */
  72    break;
  73   }
  74
  75   case O_RDWR:
  76   {
  77    nDesiredAccess = FILE_READ_ACCESS | FILE_WRITE_ACCESS;
  78    nCreateOptions = FILE_NON_DIRECTORY_FILE; /* required by the specification */
  79    break;
  80   }
  81
  82   default:
  83   {
  84    errno = EINVAL;
  85    return (-1);
  86   }
  87
  88  }
  89
  90  /* miscellaneous flags */
  91  if((oflag & _O_DIRFILE) == _O_DIRFILE)
  92   nCreateOptions |= FILE_DIRECTORY_FILE;
  93
  94  /* creation disposition */
  95  if((oflag & O_CREAT) == O_CREAT)
  96   if((oflag & O_EXCL) == O_EXCL)
  97    nCreateDisposition = FILE_CREATE;    /* O_CREAT + O_EXCL: create file, fail if file exists */
  98   else
  99    nCreateDisposition = FILE_OPEN_IF;   /* O_CREAT: open file, create if file doesn't exist */
 100  else if((oflag & O_TRUNC) == O_TRUNC)
 101   nCreateDisposition = FILE_OVERWRITE;  /* O_TRUNC: truncate existing file */
 102  else
 103   nCreateDisposition = FILE_OPEN;       /* normal: open file, fail if file doesn't exist */
 104
 105  /* lock the environment */
 106  __PdxAcquirePdataLock();
 107
 108  /* convert the path into a native path */
 109  if(!__PdxPosixPathNameToNtPathName((LPWSTR)path, __PdxGetNativePathBuffer(), __PdxGetCurDir(), NULL))
 110  {
 111   __PdxReleasePdataLock();
 112   return (-1);
 113  }
 114
 115  /* set file generic object attributes */
 116  oaFileAttribs.Length = sizeof(oaFileAttribs);
 117  oaFileAttribs.RootDirectory = __PdxGetRootHandle();
 118  oaFileAttribs.ObjectName = &wstrNativePath;
 119  oaFileAttribs.Attributes = OBJ_INHERIT; /* child processes inherit all file descriptors */
 120  oaFileAttribs.SecurityDescriptor = NULL;
 121  oaFileAttribs.SecurityQualityOfService = NULL;
 122
 123  /* open or create the file */
 124  nErrCode = NtCreateFile
 125  (
 126   &hFile,
 127   nDesiredAccess | SYNCHRONIZE,
 128   &oaFileAttribs,
 129   &isbStatus,
 130   NULL,
 131   0,
 132   FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 133   nCreateDisposition,
 134   FILE_SYNCHRONOUS_IO_NONALERT,
 135   NULL,
 136   nCreateOptions
 137  );
 138
 139  /* failure */
 140  if(!NT_SUCCESS(nErrCode))
 141  {
 142   ERR("NtCreateFile() failed with status 0x%08X", nErrCode);
 143   __PdxReleasePdataLock();
 144   errno = __status_to_errno(nErrCode);
 145   return (-1);
 146  }
 147
 148  /* initialize descriptor constructor */
 149  memset(&fdDescriptor, 0, sizeof(fdDescriptor));
 150  fdDescriptor.FileHandle = hFile;
 151  fdDescriptor.OpenFlags = oflag;
 152
 153  /* allocate a new file descriptor */
 154  nFileNo = fcntl(0, F_NEWFD, &fdDescriptor);
 155
 156  /* unlock the environment */
 157  __PdxReleasePdataLock();
 158
 159  /* could not allocate the file descriptor */
 160  if(nFileNo < 0)
 161  {
 162   NtClose(hFile);
 163   return (-1);
 164  }
 165
 166  /* return the file number */
 167  return (nFileNo);
 168 }
 169
 170 int creat(const char *path, mode_t mode)
 171 {
 172  return (open(path, O_WRONLY | O_CREAT | O_TRUNC, mode));
 173 }
 174
 175 int _Wcreat(const wchar_t *path, mode_t mode)
 176 {
 177  return (_Wopen(path, O_WRONLY | O_CREAT | O_TRUNC, mode));
 178 }
 179
 180 /* EOF */
 181