Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Uefi / SysCalls.c

/** @file\r
  EFI versions of NetBSD system calls.\r
\r
  Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials are licensed and made available under\r
  the terms and conditions of the BSD License that accompanies this distribution.\r
  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
#include  <Uefi.h>\r
#include  <Library/UefiLib.h>\r
#include  <Library/BaseLib.h>\r
#include  <Library/MemoryAllocationLib.h>\r
#include  <Library/ShellLib.h>\r
\r
#include  <LibConfig.h>\r
#include  <sys/EfiCdefs.h>\r
\r
#include  <sys/ansi.h>\r
#include  <errno.h>\r
#include  <stdarg.h>\r
#include  <string.h>\r
#include  <wchar.h>\r
#include  <sys/fcntl.h>\r
#include  <sys/stat.h>\r
#include  <sys/syslimits.h>\r
#include  "SysEfi.h"\r
#include  <MainData.h>\r
#include  <extern.h>      // Library/include/extern.h: Private to implementation\r
#include  <Efi/Console.h>\r
\r
/* Macros only used in this file. */\r
// Parameters for the ValidateFD function.\r
#define VALID_OPEN         1\r
#define VALID_CLOSED       0\r
#define VALID_DONT_CARE   -1\r
\r
\r
/* EFI versions of BSD system calls used in stdio */\r
\r
/* Normalize path so that forward slashes are replaced with backslashes.\r
    Backslashes are required for UEFI.\r
*/\r
static void\r
NormalizePath( const CHAR16 *path)\r
{\r
  CHAR16  *temp;\r
\r
  for( temp = (CHAR16 *)path; *temp; ++temp) {\r
    if(*temp == L'/') {\r
      *temp = L'\\';\r
    }\r
  }\r
}\r
\r
/*  Validate that fd refers to a valid file descriptor.\r
    IsOpen is interpreted as follows:\r
      - Positive  fd must be OPEN\r
      - Zero      fd must be CLOSED\r
      - Negative  fd may be OPEN or CLOSED\r
\r
    @retval TRUE  fd is VALID\r
    @retval FALSE fd is INVALID\r
*/\r
static BOOLEAN\r
ValidateFD( int fd, int IsOpen)\r
{\r
  BOOLEAN   retval = FALSE;\r
\r
  if((fd >= 0) && (fd < OPEN_MAX)) {\r
    retval = TRUE;\r
    if(IsOpen >= 0) {\r
      retval = (BOOLEAN)(gMD->fdarray[fd].State != 0);   // TRUE if OPEN\r
      if(IsOpen == VALID_CLOSED) {\r
        retval = (BOOLEAN)!retval;                      // We want TRUE if CLOSED\r
      }\r
    }\r
  }\r
  return retval;\r
}\r
\r
/* Find and reserve a free File Descriptor.\r
\r
  Returns the first free File Descriptor greater than or equal to the,\r
  already validated, fd specified by Minfd.\r
\r
  @return   Returns -1 if there are no free FDs.  Otherwise returns the\r
            found fd.\r
*/\r
static int\r
FindFreeFD( int MinFd )\r
{\r
  struct __filedes    *Mfd;\r
  int i;\r
  int fd = -1;\r
\r
  Mfd = gMD->fdarray;\r
\r
  // Get an available fd\r
  for(i=MinFd; i < OPEN_MAX; ++i) {\r
    if(Mfd[i].State == 0) {\r
      Mfd[i].State = S_ISYSTEM; // Temporarily mark this fd as reserved\r
      fd = i;\r
      break;\r
    }\r
  }\r
  return fd;\r
}\r
\r
/** The isatty() function tests whether fildes, an open file descriptor,\r
    is associated with a terminal device.\r
\r
    @retval   1   fildes is associated with a terminal.\r
    @retval   0   fildes is not associated with a terminal.  errno is set to\r
                  EBADF if fildes is not a valid open FD.\r
**/\r
int\r
isatty  (int fildes)\r
{\r
  int   retval = 0;\r
  EFI_FILE_HANDLE   FileHandle;\r
\r
  if(ValidateFD( fildes, VALID_OPEN)) {\r
    FileHandle = gMD->fdarray[fildes].FileHandle;\r
    retval =  (FileHandle >= &gMD->StdIo[0].Abstraction) &&\r
              (FileHandle <= &gMD->StdIo[2].Abstraction);\r
  }\r
  else {\r
    errno = EBADF;\r
  }\r
  return retval;\r
}\r
\r
static BOOLEAN\r
IsDupFd( int fd)\r
{\r
  EFI_FILE_HANDLE       FileHandle;\r
  int                   i;\r
  BOOLEAN               Ret = FALSE;\r
\r
  if(ValidateFD( fd, VALID_OPEN )) {\r
    FileHandle = gMD->fdarray[fd].FileHandle;\r
    for(i=0; i < OPEN_MAX; ++i) {\r
      if(i == fd)   continue;\r
      if(gMD->fdarray[i].State != 0) {   // TRUE if fd is OPEN\r
        if(gMD->fdarray[i].FileHandle == FileHandle) {\r
          Ret = TRUE;\r
          break;\r
        }\r
      }\r
    }\r
  }\r
  return Ret;\r
}\r
\r
static int\r
_closeX  (int fd, int NewState)\r
{\r
  struct __filedes     *Mfd;\r
  RETURN_STATUS         Status;\r
  int                   retval = 0;\r
\r
  Status = EFIerrno = RETURN_SUCCESS;  // In case of error before the EFI call.\r
\r
  // Verify my pointers and get my FD.\r
  if(ValidateFD( fd, VALID_OPEN )) {\r
    Mfd = &gMD->fdarray[fd];\r
    // Check if there are duplicates using this FileHandle\r
    if(! IsDupFd(fd)) {\r
      // Only do the close if no one else is using the FileHandle\r
      if(isatty(fd)) {\r
        Status = Mfd->FileHandle->Close( Mfd->FileHandle);\r
      }\r
      else {\r
        Status = ShellCloseFile( (SHELL_FILE_HANDLE *)&Mfd->FileHandle);\r
      }\r
    }\r
    Mfd->State = NewState;   // Close this FD or reserve it\r
    if(Status != RETURN_SUCCESS) {\r
      errno = EFI2errno(Status);\r
      EFIerrno = Status;\r
      retval = -1;\r
    }\r
  }\r
  else {\r
    // Bad FD\r
    errno = EBADF;\r
    retval = -1;\r
  }\r
  return retval;\r
}\r
\r
/** The close() function shall deallocate the file descriptor indicated by fd.\r
    To deallocate means to make the file descriptor available for return by\r
    subsequent calls to open() or other functions that allocate file\r
    descriptors. All outstanding record locks owned by the process on the file\r
    associated with the file descriptor shall be removed (that is, unlocked).\r
\r
    @return   Upon successful completion, 0 shall be returned; otherwise,\r
              -1 shall be returned and errno set to indicate the error.\r
**/\r
int\r
close  (int fd)\r
{\r
  //Print(L"Closing fd %d\n", fd);\r
  return _closeX(fd, 0);\r
}\r
\r
/* Wide character version of unlink */\r
int\r
Uunlink (const wchar_t *Path)\r
{\r
  EFI_FILE_HANDLE       FileHandle;\r
  RETURN_STATUS         Status;\r
\r
  EFIerrno = RETURN_SUCCESS;\r
\r
  NormalizePath( Path);\r
  // We can only delete open files.\r
  Status = ShellOpenFileByName( Path, (SHELL_FILE_HANDLE *)&FileHandle, 3, 0);\r
  if(Status != RETURN_SUCCESS) {\r
    errno = EFI2errno(Status);\r
    EFIerrno = Status;\r
    return -1;\r
  }\r
  Status = ShellDeleteFile( (SHELL_FILE_HANDLE *)&FileHandle);\r
  if(Status != RETURN_SUCCESS) {\r
    errno = EFI2errno(Status);\r
    EFIerrno = Status;\r
    return -1;\r
  }\r
  return 0;\r
}\r
\r
/**\r
**/\r
int\r
unlink (const char *path)\r
{\r
  // Convert path from MBCS to WCS\r
  (void)AsciiStrToUnicodeStr( path, gMD->UString);\r
\r
  return Uunlink(gMD->UString);\r
}\r
\r
/** The fcntl() function shall perform the operations described below on open\r
    files. The fildes argument is a file descriptor.\r
\r
    The available values for cmd are defined in <fcntl.h> and are as follows:\r
      - F_DUPFD - Return a new file descriptor which shall be the lowest\r
                  numbered available (that is, not already open) file\r
                  descriptor greater than or equal to the third argument, arg,\r
                  taken as an integer of type int. The new file descriptor\r
                  shall refer to the same open file description as the original\r
                  file descriptor, and shall share any locks. The FD_CLOEXEC\r
                  flag associated with the new file descriptor shall be cleared\r
                  to keep the file open across calls to one of the exec functions.\r
      - F_GETFD - Get the file descriptor flags defined in <fcntl.h> that are\r
                  associated with the file descriptor fildes. File descriptor\r
                  flags are associated with a single file descriptor and do not\r
                  affect other file descriptors that refer to the same file.\r
      - F_SETFD - Set the file descriptor flags defined in <fcntl.h>, that are\r
                  associated with fildes, to the third argument, arg, taken\r
                  as type int. If the FD_CLOEXEC flag in the third argument\r
                  is 0, the file shall remain open across the exec\r
                  functions; otherwise, the file shall be closed upon\r
                  successful execution of one of the exec functions.\r
      - F_GETFL - Get the file status flags and file access modes, defined in\r
                  <fcntl.h>, for the file description associated with fildes.\r
                  The file access modes can be extracted from the return\r
                  value using the mask O_ACCMODE, which is defined in\r
                  <fcntl.h>. File status flags and file access modes are\r
                  associated with the file description and do not affect\r
                  other file descriptors that refer to the same file with\r
                  different open file descriptions.\r
      - F_SETFL - Set the file status flags, defined in <fcntl.h>, for the file\r
                  description associated with fildes from the corresponding\r
                  bits in the third argument, arg, taken as type int. Bits\r
                  corresponding to the file access mode and the file creation\r
                  flags, as defined in <fcntl.h>, that are set in arg shall\r
                  be ignored. If any bits in arg other than those mentioned\r
                  here are changed by the application, the result is unspecified.\r
      - F_GETOWN -  If fildes refers to a socket, get the process or process group\r
                  ID specified to receive SIGURG signals when out-of-band\r
                  data is available. Positive values indicate a process ID;\r
                  negative values, other than -1, indicate a process group\r
                  ID. If fildes does not refer to a socket, the results are\r
                  unspecified.\r
      - F_SETOWN -  If fildes refers to a socket, set the process or process\r
                  group ID specified to receive SIGURG signals when\r
                  out-of-band data is available, using the value of the third\r
                  argument, arg, taken as type int. Positive values indicate\r
                  a process ID; negative values, other than -1, indicate a\r
                  process group ID. If fildes does not refer to a socket, the\r
                  results are unspecified.\r
\r
    The fcntl() function shall fail if:\r
\r
    [EBADF]       The fildes argument is not a valid open file descriptor.\r
    [EINVAL]      The cmd argument is invalid, or the cmd argument is F_DUPFD\r
                  and arg is negative or greater than or equal to {OPEN_MAX}.\r
    [EMFILE]      The argument cmd is F_DUPFD and {OPEN_MAX} file descriptors\r
                  are currently open in the calling process, or no file\r
                  descriptors greater than or equal to arg are available.\r
    [EOVERFLOW]   One of the values to be returned cannot be represented correctly.\r
\r
    @return   Upon successful completion, the value returned shall depend on\r
              cmd as follows:\r
                - F_DUPFD - A new file descriptor.\r
                - F_GETFD - Value of flags defined in <fcntl.h>. The return value\r
                            shall not be negative.\r
                - F_SETFD - Value other than -1.\r
                - F_GETFL - Value of file status flags and access modes. The return\r
                            value is not negative.\r
                - F_SETFL - Value other than -1.\r
                - F_GETOWN  - Value of the socket owner process or process group;\r
                            this will not be -1.\r
                - F_SETOWN - Value other than -1.\r
              Otherwise, -1 shall be returned and errno set to indicate the error.\r
\r
**/\r
int\r
fcntl     (int fildes, int cmd, ...)\r
{\r
  va_list             p3;\r
  struct __filedes   *MyFd;\r
  int                 retval = -1;\r
  int                 temp;\r
\r
//Print(L"%a( %d, %d, ...)\n", __func__, fildes, cmd);\r
  va_start(p3, cmd);\r
\r
  if(ValidateFD( fildes, VALID_OPEN )) {\r
    MyFd = &gMD->fdarray[fildes];\r
\r
    switch(cmd) {\r
      case F_DUPFD:\r
        temp = va_arg(p3, int);\r
        if(ValidateFD( temp, VALID_DONT_CARE )) {\r
          temp = FindFreeFD( temp );\r
          if(temp < 0) {\r
            errno = EMFILE;\r
            break;\r
          }\r
          /* temp is now a valid fd reserved for further use\r
             so copy fd into temp.\r
          */\r
          (void)memcpy(&gMD->fdarray[temp], MyFd, sizeof(struct __filedes));\r
          retval = temp;\r
        }\r
        else {\r
          errno = EINVAL;\r
        }\r
        break;\r
      //case F_SETFD:\r
      case F_SETFL:\r
        retval = MyFd->Oflags;        // Get original value\r
        temp = va_arg(p3, int);\r
        temp &= O_SETMASK;            // Only certain bits can be set\r
        temp |= retval & O_SETMASK;\r
        MyFd->Oflags = temp;          // Set new value\r
        break;\r
      //case F_SETFL:\r
      case F_SETFD:\r
        retval = MyFd->State;\r
        break;\r
      case F_SETOWN:\r
        retval = MyFd->SocProc;\r
        MyFd->SocProc = va_arg(p3, int);\r
        break;\r
      case F_GETFD:\r
        //retval = MyFd->Oflags;\r
        retval = MyFd->State;\r
        break;\r
      case F_GETFL:\r
        //retval = MyFd->State;\r
        retval = MyFd->Oflags;\r
        break;\r
      case F_GETOWN:\r
        retval = MyFd->SocProc;\r
        break;\r
      default:\r
        errno  = EINVAL;\r
        break;\r
    }\r
  }\r
  else {\r
    // Bad FD\r
    errno = EBADF;\r
  }\r
  va_end(p3);\r
  return retval;;\r
}\r
\r
/** The dup() function provides an alternative interface to the\r
    service provided by fcntl() using the F_DUPFD command. The call:\r
      - fid = dup(fildes);\r
    shall be equivalent to:\r
      - fid = fcntl(fildes, F_DUPFD, 0);\r
\r
    @return   Upon successful completion a non-negative integer, namely the\r
              file descriptor, shall be returned; otherwise, -1 shall be\r
              returned and errno set to indicate the error.\r
**/\r
int\r
dup   (int fildes)\r
{\r
  return fcntl(fildes, F_DUPFD, 0);\r
}\r
\r
/** The dup2() function provides an alternative interface to the\r
    service provided by fcntl() using the F_DUPFD command. The call:\r
      - fid = dup2(fildes, fildes2);\r
    shall be equivalent to:\r
      - close(fildes2);\r
      - fid = fcntl(fildes, F_DUPFD, fildes2);\r
    except for the following:\r
      - If fildes2 is less than 0 or greater than or equal to {OPEN_MAX},\r
        dup2() shall return -1 with errno set to [EBADF].\r
      - If fildes is a valid file descriptor and is equal to fildes2, dup2()\r
        shall return fildes2 without closing it.\r
      - If fildes is not a valid file descriptor, dup2() shall return -1 and\r
        shall not close fildes2.\r
      - The value returned shall be equal to the value of fildes2 upon\r
        successful completion, or -1 upon failure.\r
\r
    @return   Upon successful completion a non-negative integer, namely\r
              fildes2, shall be returned; otherwise, -1 shall be\r
              returned and errno set to EBADF indicate the error.\r
**/\r
int\r
dup2    (int fildes, int fildes2)\r
{\r
  int retval = -1;\r
\r
  if(ValidateFD( fildes, VALID_OPEN)) {\r
    retval = fildes2;\r
    if( fildes != fildes2) {\r
      if(ValidateFD( fildes2, VALID_DONT_CARE)) {\r
        gMD->fdarray[fildes2].State = S_ISYSTEM;  // Mark the file closed, but reserved\r
        (void)memcpy(&gMD->fdarray[fildes2],      // Duplicate fildes into fildes2\r
                     &gMD->fdarray[fildes], sizeof(struct __filedes));\r
      }\r
      else {\r
        errno = EBADF;\r
        retval = -1;\r
      }\r
    }\r
  }\r
  else {\r
    errno = EBADF;\r
  }\r
  return retval;\r
}\r
\r
/** Reposition a file's read/write offset.\r
\r
    The lseek() function repositions the offset of the file descriptor fildes\r
    to the argument offset according to the directive how.  The argument\r
    fildes must be an open file descriptor.  lseek() repositions the file\r
    pointer fildes as follows:\r
\r
         If how is SEEK_SET, the offset is set to offset bytes.\r
\r
         If how is SEEK_CUR, the offset is set to its current location\r
         plus offset bytes.\r
\r
         If how is SEEK_END, the offset is set to the size of the file\r
         plus offset bytes.\r
\r
    The lseek() function allows the file offset to be set beyond the end of\r
    the existing end-of-file of the file.  If data is later written at this\r
    point, subsequent reads of the data in the gap return bytes of zeros\r
    (until data is actually written into the gap).\r
\r
    Some devices are incapable of seeking.  The value of the pointer associ-\r
    ated with such a device is undefined.\r
\r
    @return   Upon successful completion, lseek() returns the resulting offset\r
              location as measured in bytes from the beginning of the file.\r
              Otherwise, a value of -1 is returned and errno is set to\r
              indicate the error.\r
**/\r
__off_t\r
lseek (int fildes, __off_t offset, int how)\r
{\r
  __off_t             CurPos = -1;\r
  RETURN_STATUS       Status = RETURN_SUCCESS;\r
  EFI_FILE_HANDLE     FileHandle;\r
\r
  EFIerrno = RETURN_SUCCESS;    // In case of error without an EFI call\r
\r
  if( how == SEEK_SET || how == SEEK_CUR  || how == SEEK_END) {\r
    if(ValidateFD( fildes, VALID_OPEN)) {\r
      // Both of our parameters have been verified as valid\r
      FileHandle = gMD->fdarray[fildes].FileHandle;\r
      CurPos = 0;\r
      if(isatty(fildes)) {\r
        Status = FileHandle->SetPosition( FileHandle, offset);\r
        CurPos = offset;\r
      }\r
      else {\r
        if(how != SEEK_SET) {\r
          // We are doing a relative seek\r
          if(how == SEEK_END) {\r
            // seeking relative to EOF, so position there first.\r
            Status = ShellSetFilePosition( (SHELL_FILE_HANDLE)FileHandle, 0xFFFFFFFFFFFFFFFFULL);\r
          }\r
          if(Status == RETURN_SUCCESS) {\r
            // Now, determine our current position.\r
            Status = ShellGetFilePosition( (SHELL_FILE_HANDLE)FileHandle, (UINT64 *)&CurPos);\r
          }\r
        }\r
        if(Status == RETURN_SUCCESS) {\r
          /* CurPos now indicates the point we are seeking from, so seek... */\r
          Status = ShellSetFilePosition( (SHELL_FILE_HANDLE)FileHandle, (UINT64)(CurPos + offset));\r
          if(Status == RETURN_SUCCESS) {\r
            // Now, determine our final position.\r
            Status = ShellGetFilePosition( (SHELL_FILE_HANDLE)FileHandle, (UINT64 *)&CurPos);\r
          }\r
        }\r
        if(Status != RETURN_SUCCESS) {\r
          EFIerrno = Status;\r
          CurPos = -1;\r
          if(Status == EFI_UNSUPPORTED) {\r
            errno = EISDIR;\r
          }\r
          else {\r
            errno = EFI2errno(Status);\r
          }\r
        }\r
      }\r
    }\r
    else {\r
      errno = EBADF;  // Bad File Descriptor\r
    }\r
  }\r
  else {\r
    errno = EINVAL;   // Invalid how argument\r
  }\r
  return CurPos;\r
}\r
\r
/** The directory path is created with the access permissions specified by\r
    perms.\r
\r
    The directory is closed after it is created.\r
\r
    @retval   0   The directory was created successfully.\r
    @retval  -1   An error occurred and an error code is stored in errno.\r
**/\r
int\r
mkdir (const char *path, __mode_t perms)\r
{\r
  EFI_FILE_HANDLE   FileHandle;\r
  RETURN_STATUS     Status;\r
  EFI_FILE_INFO     *FileInfo;\r
\r
  // Convert name from MBCS to WCS\r
  (void)AsciiStrToUnicodeStr( path, gMD->UString);\r
  NormalizePath( gMD->UString);\r
\r
//Print(L"%a( \"%s\", 0x%8X)\n", __func__, gMD->UString, perms);\r
  Status = ShellCreateDirectory( gMD->UString, (SHELL_FILE_HANDLE *)&FileHandle);\r
  if(Status == RETURN_SUCCESS) {\r
    FileInfo = ShellGetFileInfo( FileHandle);\r
    if(FileInfo != NULL) {\r
      FileInfo->Attribute = Omode2EFI(perms);\r
      Status = ShellSetFileInfo( FileHandle, FileInfo);\r
      FreePool(FileInfo);\r
      if(Status == RETURN_SUCCESS) {\r
        (void)ShellCloseFile((SHELL_FILE_HANDLE *)&FileHandle);\r
        return 0;\r
      }\r
    }\r
  }\r
  errno = EFI2errno(Status);\r
  EFIerrno = Status;\r
\r
  return -1;\r
}\r
\r
/** Open a file.\r
\r
    The EFI ShellOpenFileByName() function is used to perform the low-level\r
    file open operation.  The primary task of open() is to translate from the\r
    flags used in the <stdio.h> environment to those used by the EFI function.\r
\r
    The only valid flag combinations for ShellOpenFileByName() are:\r
      - Read\r
      - Read/Write\r
      - Create/Read/Write\r
\r
    The mode value is saved in the FD to indicate permissions for further operations.\r
\r
    O_RDONLY      -- flags = EFI_FILE_MODE_READ -- this is always done\r
    O_WRONLY      -- flags |= EFI_FILE_MODE_WRITE\r
    O_RDWR        -- flags |= EFI_FILE_MODE_WRITE -- READ is already set\r
\r
    O_NONBLOCK    -- ignored\r
    O_APPEND      -- Seek to EOF before every write\r
    O_CREAT       -- flags |= EFI_FILE_MODE_CREATE\r
    O_TRUNC       -- delete first then create new\r
    O_EXCL        -- if O_CREAT is also set, open will fail if the file already exists.\r
**/\r
int\r
open   (const char *name, int oflags, int mode)\r
{\r
  EFI_FILE_HANDLE       FileHandle;\r
  struct __filedes     *Mfd;\r
  RETURN_STATUS         Status;\r
  UINT64                OpenMode;\r
  UINT64                Attributes;\r
  int                   fd = -1;\r
  UINT32                NewState;\r
\r
  EFIerrno = RETURN_SUCCESS;\r
  Mfd = gMD->fdarray;\r
\r
  // Convert name from MBCS to WCS\r
  (void)AsciiStrToUnicodeStr( name, gMD->UString);\r
  NormalizePath( gMD->UString);\r
\r
  // Convert oflags to Attributes\r
  OpenMode = Oflags2EFI(oflags);\r
  if(OpenMode == 0) {\r
    errno = EINVAL;\r
    return -1;\r
  }\r
\r
  //Attributes = Omode2EFI(mode);\r
  Attributes = 0;\r
\r
  // Could add a test to see if the file name begins with a period.\r
  // If it does, then add the HIDDEN flag to Attributes.\r
\r
  // Get an available fd\r
  fd = FindFreeFD( 0 );\r
\r
  if( fd < 0 ) {\r
    // All available FDs are in use\r
    errno = EMFILE;\r
    return -1;\r
  }\r
\r
  Status = ConOpen( NULL, &FileHandle, gMD->UString, OpenMode, Attributes);\r
  if(Status == RETURN_NO_MAPPING) {\r
    // Not a console device, how about a regular file device?\r
\r
    /* Do we care if the file already exists?\r
       If O_TRUNC, then delete the file.  It will be created anew subsequently.\r
       If O_EXCL, then error if the file exists and O_CREAT is set.\r
\r
    !!!!!!!!! Change this to use ShellSetFileInfo() to actually truncate the file\r
    !!!!!!!!! instead of deleting and re-creating it.\r
    */\r
    if((oflags & O_TRUNC) || ((oflags & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT))) {\r
      Status = ShellIsFile( gMD->UString );\r
      if(Status == RETURN_SUCCESS) {\r
        // The file exists\r
        if(oflags & O_TRUNC) {\r
          // We do a truncate by deleting the existing file and creating a new one.\r
          if(Uunlink(gMD->UString) != 0) {\r
            Mfd[fd].State = 0;    // Release our reservation on this FD\r
            return -1;  // errno and EFIerrno are already set.\r
          }\r
        }\r
        else if(oflags & (O_EXCL | O_CREAT)) {\r
          errno = EEXIST;\r
          EFIerrno = Status;\r
          Mfd[fd].State = 0;    // Release our reservation on this FD\r
          return -1;\r
        }\r
      }\r
    }\r
    // Call the EFI Shell's Open function\r
    Status = ShellOpenFileByName( gMD->UString, (SHELL_FILE_HANDLE *)&FileHandle, OpenMode, Attributes);\r
    if(RETURN_ERROR(Status)) {\r
      Mfd[fd].State = 0;    // Release our reservation on this FD\r
      // Set errno based upon Status\r
      errno = EFI2errno(Status);\r
      EFIerrno = Status;\r
      return -1;\r
    }\r
    // Successfully got a regular File\r
    NewState = S_IFREG;\r
  }\r
  else if(Status != RETURN_SUCCESS) {\r
    // Set errno based upon Status\r
    errno = EFI2errno(Status);\r
    EFIerrno = Status;\r
    return -1;\r
  }\r
  else {\r
    // Succesfully got a Console stream\r
    NewState = S_IFREG | _S_ITTY | _S_IFCHR;\r
  }\r
\r
  // Update the info in the fd\r
  Mfd[fd].FileHandle = FileHandle;\r
  Mfd[fd].Oflags = oflags;\r
  Mfd[fd].Omode = mode;\r
\r
  // Re-use OpenMode in order to build our final State value\r
  OpenMode  = ( mode & S_ACC_READ )  ? S_ACC_READ : 0;\r
  OpenMode |= ( mode & S_ACC_WRITE ) ? S_ACC_WRITE : 0;\r
\r
  Mfd[fd].State = NewState | (UINT32)OpenMode;\r
\r
  // return the fd of our now open file\r
  return fd;\r
}\r
\r
/** The rename() function changes the name of a file.\r
    The old argument points to the pathname of the file to be renamed. The new\r
    argument points to the new pathname of the file.\r
\r
    If the old argument points to the pathname of a file that is not a\r
    directory, the new argument shall not point to the pathname of a\r
    directory. If the file named by the new argument exists, it shall be\r
    removed and old renamed to new. Write access permission is required for\r
    both the directory containing old and the directory containing new.\r
\r
    If the old argument points to the pathname of a directory, the new\r
    argument shall not point to the pathname of a file that is not a\r
    directory. If the directory named by the new argument exists, it shall be\r
    removed and old renamed to new.\r
\r
    The new pathname shall not contain a path prefix that names old. Write\r
    access permission is required for the directory containing old and the\r
    directory containing new. If the old argument points to the pathname of a\r
    directory, write access permission may be required for the directory named\r
    by old, and, if it exists, the directory named by new.\r
\r
    If the rename() function fails for any reason other than [EIO], any file\r
    named by new shall be unaffected.\r
\r
    @return   Upon successful completion, rename() shall return 0; otherwise,\r
              -1 shall be returned, errno shall be set to indicate the error,\r
              and neither the file named by old nor the file named by new\r
              shall be changed or created.\r
**/\r
int\r
rename    (const char *old, const char *new)\r
{\r
 // UINT64            InfoSize;\r
 // RETURN_STATUS     Status;\r
 // EFI_FILE_INFO     *NewFileInfo = NULL;\r
 // EFI_FILE_INFO     *OldFileInfo;\r
 // char              *Newfn;\r
 // int                OldFd;\r
\r
 //// Open old file\r
 // OldFd = open(old, O_RDONLY, 0);\r
 // if(OldFd >= 0) {\r
 //   NewFileInfo = malloc(sizeof(EFI_FILE_INFO) + PATH_MAX);\r
 //   if(NewFileInfo != NULL) {\r
 //     OldFileInfo = ShellGetFileInfo( FileHandle);\r
 //     if(OldFileInfo != NULL) {\r
 //       // Copy the Old file info into our new buffer, and free the old.\r
 //       memcpy(OldFileInfo, NewFileInfo, sizeof(EFI_FILE_INFO));\r
 //       FreePool(OldFileInfo);\r
 //       // Strip off all but the file name portion of new\r
 //       NewFn = strrchr(new, '/');\r
 //       if(NewFn == NULL) {\r
 //         NewFn = strrchr(new '\\');\r
 //         if(NewFn == NULL) {\r
 //           NewFn = new;\r
 //         }\r
 //       }\r
 //       // Convert new name from MBCS to WCS\r
 //       (void)AsciiStrToUnicodeStr( NewFn, gMD->UString);\r
 //       // Copy the new file name into our new file info buffer\r
 //       wcsncpy(NewFileInfo->FileName, gMD->UString, wcslen(gMD->UString)+1);\r
 //       // Apply the new file name\r
 //       Status = ShellSetFileInfo(FileHandle);\r
 //       if(Status == EFI_SUCCESS) {\r
 //         // File has been successfully renamed.  We are DONE!\r
 //         return 0;\r
 //       }\r
 //       errno = EFI2errno( Status );\r
 //       EFIerrno = Status;\r
 //     }\r
 //     else {\r
 //       errno = EIO;\r
 //     }\r
 //   }\r
 //   else {\r
 //     errno = ENOMEM;\r
 //   }\r
 // }\r
  return -1;\r
}\r
\r
/**\r
**/\r
int\r
rmdir     (const char *path)\r
{\r
  EFI_FILE_HANDLE   FileHandle;\r
  RETURN_STATUS     Status;\r
  EFI_FILE_INFO     *FileInfo = NULL;\r
  int               Count = 0;\r
  BOOLEAN           NoFile = FALSE;\r
\r
  errno = 0;    // Make it easier to see if we have an error later\r
\r
  // Convert name from MBCS to WCS\r
  (void)AsciiStrToUnicodeStr( path, gMD->UString);\r
  NormalizePath( gMD->UString);\r
\r
//Print(L"%a( \"%s\")\n", __func__, gMD->UString);\r
  Status = ShellOpenFileByName( gMD->UString, (SHELL_FILE_HANDLE *)&FileHandle,\r
                               (EFI_FILE_MODE_READ || EFI_FILE_MODE_WRITE), 0);\r
  if(Status == RETURN_SUCCESS) {\r
    FileInfo = ShellGetFileInfo( (SHELL_FILE_HANDLE)FileHandle);\r
    if(FileInfo != NULL) {\r
      if((FileInfo->Attribute & EFI_FILE_DIRECTORY) == 0) {\r
        errno = ENOTDIR;\r
      }\r
      else {\r
        // See if the directory has any entries other than ".." and ".".\r
        FreePool(FileInfo);  // Free up the buffer from ShellGetFileInfo()\r
        Status = ShellFindFirstFile( (SHELL_FILE_HANDLE)FileHandle, &FileInfo);\r
        if(Status == RETURN_SUCCESS) {\r
          ++Count;\r
          while(Count < 3) {\r
            Status = ShellFindNextFile( (SHELL_FILE_HANDLE)FileHandle, FileInfo, &NoFile);\r
            if(Status == RETURN_SUCCESS) {\r
              if(NoFile) {\r
                break;\r
              }\r
              ++Count;\r
            }\r
            else {\r
              Count = 99;\r
            }\r
          }\r
          FreePool(FileInfo);   // Free buffer from ShellFindFirstFile()\r
          if(Count < 3) {\r
            // Directory is empty\r
            Status = ShellDeleteFile( (SHELL_FILE_HANDLE *)&FileHandle);\r
            if(Status == RETURN_SUCCESS) {\r
              EFIerrno = RETURN_SUCCESS;\r
              return 0;\r
              /* ######## SUCCESSFUL RETURN ######## */\r
            }\r
          }\r
          else {\r
            if(Count == 99) {\r
              errno = EIO;\r
            }\r
            else {\r
              errno = ENOTEMPTY;\r
            }\r
          }\r
        }\r
      }\r
    }\r
    else {\r
      errno = EIO;\r
    }\r
  }\r
  EFIerrno = Status;\r
  if(errno == 0) {\r
    errno = EFI2errno( Status );\r
  }\r
  return -1;\r
}\r
\r
/* Internal File Info. worker function for stat and fstat. */\r
static\r
EFI_STATUS\r
_EFI_FileInfo( EFI_FILE_INFO *FileInfo, struct stat *statbuf)\r
{\r
  UINT64            Attributes;\r
  RETURN_STATUS     Status;\r
  mode_t            newmode;\r
\r
  if(FileInfo != NULL) {\r
    // Got the info, now populate statbuf with it\r
    statbuf->st_blksize   = S_BLKSIZE;\r
    statbuf->st_size      = FileInfo->Size;\r
    statbuf->st_physsize  = FileInfo->PhysicalSize;\r
    statbuf->st_birthtime = Efi2Time( &FileInfo->CreateTime);\r
    statbuf->st_atime     = Efi2Time( &FileInfo->LastAccessTime);\r
    statbuf->st_mtime     = Efi2Time( &FileInfo->ModificationTime);\r
    Attributes = FileInfo->Attribute;\r
    newmode               = (mode_t)(Attributes << S_EFISHIFT) | S_ACC_READ;\r
    if((Attributes & EFI_FILE_DIRECTORY) == 0) {\r
      newmode |= _S_IFREG;\r
      if((Attributes & EFI_FILE_READ_ONLY) == 0) {\r
        statbuf->st_mode |= S_ACC_WRITE;\r
      }\r
    }\r
    else {\r
      newmode |= _S_IFDIR;\r
    }\r
    statbuf->st_mode      = newmode;\r
    Status = RETURN_SUCCESS;\r
  }\r
  else {\r
    Status = RETURN_DEVICE_ERROR;\r
  }\r
  return Status;\r
}\r
\r
/** The fstat() function obtains information about an open file associated\r
    with the file descriptor fildes, and shall write it to the area pointed to\r
    by buf.\r
\r
    The buf argument is a pointer to a stat structure, as defined\r
    in <sys/stat.h>, into which information is placed concerning the file.\r
\r
    The structure members st_mode, st_ino, st_dev, st_uid, st_gid, st_atime,\r
    st_ctime, and st_mtime shall have meaningful values. The value of the\r
    member st_nlink shall be set to the number of links to the file.\r
\r
    The fstat() function shall update any time-related fields before writing\r
    into the stat structure.\r
\r
    The fstat() function is implemented using the ShellGetFileInfo()\r
    function.\r
\r
    The stat structure members which don't have direct analogs to EFI file\r
    information are filled in as follows:\r
      - st_mode     Populated with information from fildes\r
      - st_ino      Set to zero.  (inode)\r
      - st_dev      Set to zero.\r
      - st_uid      Set to zero.\r
      - st_gid      Set to zero.\r
      - st_nlink    Set to one.\r
\r
    @param[in]    fildes    File descriptor as returned from open().\r
    @param[out]   statbuf   Buffer in which the file status is put.\r
\r
    @retval    0  Successful Completion.\r
    @retval   -1  An error has occurred and errno has been set to\r
                  identify the error.\r
**/\r
int\r
fstat (int fildes, struct stat *statbuf)\r
{\r
  EFI_FILE_HANDLE   FileHandle;\r
  RETURN_STATUS     Status = RETURN_SUCCESS;\r
  EFI_FILE_INFO     *FileInfo = NULL;\r
  UINTN             FinfoSize = sizeof(EFI_FILE_INFO);\r
\r
  if(ValidateFD( fildes, VALID_OPEN)) {\r
    FileHandle = gMD->fdarray[fildes].FileHandle;\r
    if(isatty(fildes)) {\r
      FileInfo = AllocateZeroPool(FinfoSize);\r
      if(FileInfo != NULL) {\r
        Status = FileHandle->GetInfo( FileHandle, 0, &FinfoSize, FileInfo);\r
      }\r
      else {\r
        Status = RETURN_OUT_OF_RESOURCES;\r
      }\r
    }\r
    else {\r
      FileInfo = ShellGetFileInfo( FileHandle);\r
    }\r
    Status = _EFI_FileInfo( FileInfo, statbuf);\r
  }\r
  errno     = EFI2errno(Status);\r
  EFIerrno  = Status;\r
\r
  if(FileInfo != NULL) {\r
    FreePool(FileInfo);     // Release the buffer allocated by the GetInfo function\r
  }\r
\r
  return errno? -1 : 0;\r
}\r
\r
/** Obtains information about the file pointed to by path.\r
\r
    Opens the file pointed to by path, calls _EFI_FileInfo with the file's handle,\r
    then closes the file.\r
\r
    @retval    0  Successful Completion.\r
    @retval   -1  An error has occurred and errno has been set to\r
                  identify the error.\r
**/\r
int\r
stat   (const char *path, void *statbuf)\r
{\r
  EFI_FILE_HANDLE   FileHandle;\r
  RETURN_STATUS     Status;\r
  EFI_FILE_INFO     *FileInfo;\r
\r
  errno = 0;    // Make it easier to see if we have an error later\r
\r
  // Convert name from MBCS to WCS\r
  (void)AsciiStrToUnicodeStr( path, gMD->UString);\r
  NormalizePath( gMD->UString);\r
\r
  Status = ShellOpenFileByName( gMD->UString, (SHELL_FILE_HANDLE *)&FileHandle, EFI_FILE_MODE_READ, 0ULL);\r
  if(Status == RETURN_SUCCESS) {\r
    FileInfo = ShellGetFileInfo( FileHandle);\r
    Status = _EFI_FileInfo( FileInfo, (struct stat *)statbuf);\r
    (void)ShellCloseFile( (SHELL_FILE_HANDLE *)&FileHandle);\r
  }\r
  errno     = EFI2errno(Status);\r
  EFIerrno  = Status;\r
\r
  return errno? -1 : 0;\r
}\r
\r
/**  Same as stat since EFI doesn't have symbolic links.  **/\r
int\r
lstat (const char *path, struct stat *statbuf)\r
{\r
  return stat(path, statbuf);\r
}\r
\r
/** Read from a file.\r
\r
    The read() function shall attempt to read nbyte bytes from the file\r
    associated with the open file descriptor, fildes, into the buffer pointed\r
    to by buf.\r
\r
    Before any action described below is taken, and if nbyte is zero, the\r
    read() function may detect and return errors as described below. In the\r
    absence of errors, or if error detection is not performed, the read()\r
    function shall return zero and have no other results.\r
\r
    On files that support seeking (for example, a regular file), the read()\r
    shall start at a position in the file given by the file offset associated\r
    with fildes. The file offset shall be incremented by the number of bytes\r
    actually read.\r
\r
    Files that do not support seeking - for example, terminals - always read\r
    from the current position. The value of a file offset associated with\r
    such a file is undefined.\r
\r
    No data transfer shall occur past the current end-of-file. If the\r
    starting position is at or after the end-of-file, 0 shall be returned.\r
\r
    The read() function reads data previously written to a file. If any\r
    portion of a regular file prior to the end-of-file has not been written,\r
    read() shall return bytes with value 0. For example, lseek() allows the\r
    file offset to be set beyond the end of existing data in the file. If data\r
    is later written at this point, subsequent reads in the gap between the\r
    previous end of data and the newly written data shall return bytes with\r
    value 0 until data is written into the gap.\r
\r
    Upon successful completion, where nbyte is greater than 0, read() shall\r
    mark for update the st_atime field of the file, and shall return the\r
    number of bytes read. This number shall never be greater than nbyte. The\r
    value returned may be less than nbyte if the number of bytes left in the\r
    file is less than nbyte, if the read() request was interrupted by a\r
    signal, or if the file is a pipe or FIFO or special file and has fewer\r
    than nbyte bytes immediately available for reading. For example, a read()\r
    from a file associated with a terminal may return one typed line of data.\r
\r
    If fildes does not refer to a directory, the function reads the requested\r