posix/lib/psxdll/unistd/write.c

   1 /* $Id: write.c,v 1.6 2002/10/29 04:45:48 rex Exp $
   2  */
   3 /*
   4  * COPYRIGHT:   See COPYING in the top level directory
   5  * PROJECT:     ReactOS POSIX+ Subsystem
   6  * FILE:        subsys/psx/lib/psxdll/unistd/write.c
   7  * PURPOSE:     Write on a file
   8  * PROGRAMMER:  KJK::Hyperion <noog@libero.it>
   9  * UPDATE HISTORY:
  10  *              15/02/2002: Created
  11  *              21/03/2002: Implemented write() (KJK::Hyperion <noog@libero.it>)
  12  */
  13
  14 #include <ddk/ntddk.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <psx/debug.h>
  19 #include <psx/errno.h>
  20 #include <psx/fdtable.h>
  21
  22 ssize_t write(int fildes, const void *buf, size_t nbyte)
  23 {
  24  __fildes_t      fdDescriptor;
  25  NTSTATUS        nErrCode;
  26  IO_STATUS_BLOCK isbStatus;
  27
  28  if(nbyte == 0)
  29   return (0);
  30
  31  if(fcntl(fildes, F_GETALL, &fdDescriptor) == -1)
  32  {
  33   ERR("fcntl() failed, errno %d", errno);
  34   return (0);
  35  }
  36
  37  if((fdDescriptor.OpenFlags && O_APPEND) == O_APPEND)
  38  {
  39   TODO("move file pointer to the end");
  40  }
  41
  42  INFO("handle for descriptor %d is %d", fildes, fdDescriptor.FileHandle);
  43
  44  nErrCode = NtWriteFile
  45  (
  46   fdDescriptor.FileHandle,
  47   NULL,
  48   NULL,
  49   NULL,
  50   &isbStatus,
  51   (PVOID)buf,
  52   nbyte,
  53   NULL,
  54   NULL
  55  );
  56
  57  if(!NT_SUCCESS(nErrCode))
  58  {
  59   ERR("NtWriteFile() failed with status 0x%08X", nErrCode);
  60   errno = __status_to_errno(nErrCode);
  61   return (0);
  62  }
  63
  64  return (isbStatus.Information);
  65 }
  66
  67 /* EOF */
  68