reactos/posix/lib/psxdll/fcntl/open.c
2002-10-29 04:45:58 +00:00

181 lines
4.2 KiB
C

/* $Id: open.c,v 1.5 2002/10/29 04:45:31 rex Exp $
*/
/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS POSIX+ Subsystem
* FILE: subsys/psx/lib/psxdll/fcntl/open.c
* PURPOSE: Open a file
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
* UPDATE HISTORY:
* 04/02/2002: Created
*/
#include <ddk/ntddk.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <psx/path.h>
#include <psx/debug.h>
#include <psx/errno.h>
#include <psx/pdata.h>
int open(const char *path, int oflag, ...)
{
ANSI_STRING strPath;
UNICODE_STRING wstrPath;
int nRetVal;
RtlInitAnsiString(&strPath, (PCSZ)path);
RtlAnsiStringToUnicodeString(&wstrPath, &strPath, TRUE);
nRetVal = _Wopen(wstrPath.Buffer, oflag);
RtlFreeUnicodeString(&wstrPath);
return (nRetVal);
}
int _Wopen(const wchar_t *path, int oflag, ...)
{
OBJECT_ATTRIBUTES oaFileAttribs;
IO_STATUS_BLOCK isbStatus;
UNICODE_STRING wstrNativePath;
NTSTATUS nErrCode;
ULONG nDesiredAccess;
ULONG nCreateDisposition;
ULONG nCreateOptions;
HANDLE hFile;
#if 0
mode_t mFileMode;
#endif
int nFileNo;
__fildes_t fdDescriptor;
/* translate file access flag */
switch(oflag & O_ACCMODE)
{
case O_RDONLY:
{
nDesiredAccess = FILE_READ_ACCESS;
nCreateOptions = 0;
break;
}
case O_WRONLY:
{
nDesiredAccess = FILE_WRITE_ACCESS;
nCreateOptions = FILE_NON_DIRECTORY_FILE; /* required by the specification */
break;
}
case O_RDWR:
{
nDesiredAccess = FILE_READ_ACCESS | FILE_WRITE_ACCESS;
nCreateOptions = FILE_NON_DIRECTORY_FILE; /* required by the specification */
break;
}
default:
{
errno = EINVAL;
return (-1);
}
}
/* miscellaneous flags */
if((oflag & _O_DIRFILE) == _O_DIRFILE)
nCreateOptions |= FILE_DIRECTORY_FILE;
/* creation disposition */
if((oflag & O_CREAT) == O_CREAT)
if((oflag & O_EXCL) == O_EXCL)
nCreateDisposition = FILE_CREATE; /* O_CREAT + O_EXCL: create file, fail if file exists */
else
nCreateDisposition = FILE_OPEN_IF; /* O_CREAT: open file, create if file doesn't exist */
else if((oflag & O_TRUNC) == O_TRUNC)
nCreateDisposition = FILE_OVERWRITE; /* O_TRUNC: truncate existing file */
else
nCreateDisposition = FILE_OPEN; /* normal: open file, fail if file doesn't exist */
/* lock the environment */
__PdxAcquirePdataLock();
/* convert the path into a native path */
if(!__PdxPosixPathNameToNtPathName((LPWSTR)path, __PdxGetNativePathBuffer(), __PdxGetCurDir(), NULL))
{
__PdxReleasePdataLock();
return (-1);
}
/* set file generic object attributes */
oaFileAttribs.Length = sizeof(oaFileAttribs);
oaFileAttribs.RootDirectory = __PdxGetRootHandle();
oaFileAttribs.ObjectName = &wstrNativePath;
oaFileAttribs.Attributes = OBJ_INHERIT; /* child processes inherit all file descriptors */
oaFileAttribs.SecurityDescriptor = NULL;
oaFileAttribs.SecurityQualityOfService = NULL;
/* open or create the file */
nErrCode = NtCreateFile
(
&hFile,
nDesiredAccess | SYNCHRONIZE,
&oaFileAttribs,
&isbStatus,
NULL,
0,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
nCreateDisposition,
nCreateOptions | FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0
);
/* failure */
if(!NT_SUCCESS(nErrCode))
{
ERR("NtCreateFile() failed with status 0x%08X", nErrCode);
__PdxReleasePdataLock();
errno = __status_to_errno(nErrCode);
return (-1);
}
/* initialize descriptor constructor */
memset(&fdDescriptor, 0, sizeof(fdDescriptor));
fdDescriptor.FileHandle = hFile;
fdDescriptor.OpenFlags = oflag;
/* allocate a new file descriptor */
nFileNo = fcntl(0, F_NEWFD, &fdDescriptor);
/* unlock the environment */
__PdxReleasePdataLock();
/* could not allocate the file descriptor */
if(nFileNo < 0)
{
NtClose(hFile);
return (-1);
}
/* return the file number */
return (nFileNo);
}
int creat(const char *path, mode_t mode)
{
return (open(path, O_WRONLY | O_CREAT | O_TRUNC, mode));
}
int _Wcreat(const wchar_t *path, mode_t mode)
{
return (_Wopen(path, O_WRONLY | O_CREAT | O_TRUNC, mode));
}
/* EOF */