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