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3a6e2ff08a
and other special flags on Windows. May fix intermittent 'Permission denied' errors. Magnus Hagander
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* open.c
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* Win32 open() replacement
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*
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*
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/port/open.c,v 1.14 2006/08/30 18:06:27 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifdef WIN32
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#include "c.h"
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#include <windows.h>
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#include <fcntl.h>
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#include <assert.h>
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static int
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openFlagsToCreateFileFlags(int openFlags)
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{
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switch (openFlags & (O_CREAT | O_TRUNC | O_EXCL))
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{
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case 0:
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case O_EXCL:
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return OPEN_EXISTING;
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case O_CREAT:
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return OPEN_ALWAYS;
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case O_TRUNC:
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case O_TRUNC | O_EXCL:
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return TRUNCATE_EXISTING;
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case O_CREAT | O_TRUNC:
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return CREATE_ALWAYS;
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case O_CREAT | O_EXCL:
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case O_CREAT | O_TRUNC | O_EXCL:
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return CREATE_NEW;
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}
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/* will never get here */
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return 0;
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}
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/*
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* - file attribute setting, based on fileMode?
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* - handle other flags? (eg FILE_FLAG_NO_BUFFERING/FILE_FLAG_WRITE_THROUGH)
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*/
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int
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pgwin32_open(const char *fileName, int fileFlags,...)
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{
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int fd;
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HANDLE h;
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SECURITY_ATTRIBUTES sa;
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/* Check that we can handle the request */
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assert((fileFlags & ((O_RDONLY | O_WRONLY | O_RDWR) | O_APPEND |
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(O_RANDOM | O_SEQUENTIAL | O_TEMPORARY) |
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_O_SHORT_LIVED | O_DSYNC |
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(O_CREAT | O_TRUNC | O_EXCL) | (O_TEXT | O_BINARY))) == fileFlags);
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sa.nLength = sizeof(sa);
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sa.bInheritHandle = TRUE;
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sa.lpSecurityDescriptor = NULL;
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if ((h = CreateFile(fileName,
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/* cannot use O_RDONLY, as it == 0 */
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(fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) :
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((fileFlags & O_WRONLY) ? GENERIC_WRITE : GENERIC_READ),
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/* These flags allow concurrent rename/unlink */
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(FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE),
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&sa,
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openFlagsToCreateFileFlags(fileFlags),
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FILE_ATTRIBUTE_NORMAL |
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((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) |
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((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) |
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((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) |
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((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0) |
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((fileFlags & O_DSYNC) ? FILE_FLAG_WRITE_THROUGH : 0),
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NULL)) == INVALID_HANDLE_VALUE)
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{
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switch (GetLastError())
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{
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/* EMFILE, ENFILE should not occur from CreateFile. */
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case ERROR_PATH_NOT_FOUND:
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case ERROR_FILE_NOT_FOUND:
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errno = ENOENT;
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break;
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case ERROR_FILE_EXISTS:
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errno = EEXIST;
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break;
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case ERROR_ACCESS_DENIED:
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errno = EACCES;
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break;
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default:
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errno = EINVAL;
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}
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return -1;
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}
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/* _open_osfhandle will, on error, set errno accordingly */
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if ((fd = _open_osfhandle((long) h, fileFlags & O_APPEND)) < 0 ||
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(fileFlags & (O_TEXT | O_BINARY) && (_setmode(fd, fileFlags & (O_TEXT | O_BINARY)) < 0)))
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CloseHandle(h); /* will not affect errno */
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return fd;
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}
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FILE *
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pgwin32_fopen(const char *fileName, const char *mode)
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{
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int openmode = 0;
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int fd;
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if (strstr(mode, "r+"))
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openmode |= O_RDWR;
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else if (strchr(mode, 'r'))
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openmode |= O_RDONLY;
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if (strstr(mode, "w+"))
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openmode |= O_RDWR | O_CREAT | O_TRUNC;
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else if (strchr(mode, 'w'))
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openmode |= O_WRONLY | O_CREAT | O_TRUNC;
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if (strchr(mode, 'a'))
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openmode |= O_WRONLY | O_APPEND;
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if (strchr(mode, 'b'))
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openmode |= O_BINARY;
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if (strchr(mode, 't'))
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openmode |= O_TEXT;
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fd = pgwin32_open(fileName, openmode);
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if (fd == -1)
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return NULL;
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return _fdopen(fd, mode);
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}
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#endif
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