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// file.h cross platform basic file class. supports 64 bit offsets and such.
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#if !defined(_WIN32)
#include "errno.h"
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/statvfs.h>
#endif
#include "text.h"
namespace mongo {
#ifndef __sunos__
typedef uint64_t fileofs;
#else
typedef boost::uint64_t fileofs;
#endif
/* NOTE: not thread-safe. (at least the windows implementation isn't. */
class FileInterface {
public:
void open(const char *fn) {}
void write(fileofs o, const char *data, unsigned len) {}
void read(fileofs o, char *data, unsigned len) {}
bool bad() {return false;}
bool is_open() {return false;}
fileofs len() { return 0; }
void fsync() { assert(false); }
// shrink file to size bytes. No-op if file already smaller.
void truncate(fileofs size);
/** @return -1 if error or unavailable */
static boost::intmax_t freeSpace(const string &path) { assert(false); return -1; }
};
#if defined(_WIN32)
#include <io.h>
class File : public FileInterface {
HANDLE fd;
bool _bad;
string _name;
void err(BOOL b=false) { /* false = error happened */
if( !b && !_bad ) {
_bad = true;
log() << "File " << _name << "I/O error " << GetLastError() << '\n';
}
}
public:
File() {
fd = INVALID_HANDLE_VALUE;
_bad = true;
}
~File() {
if( is_open() ) CloseHandle(fd);
fd = INVALID_HANDLE_VALUE;
}
void open(const char *filename, bool readOnly=false , bool direct=false) {
_name = filename;
fd = CreateFile(
toNativeString(filename).c_str(),
( readOnly ? 0 : GENERIC_WRITE ) | GENERIC_READ, FILE_SHARE_WRITE|FILE_SHARE_READ,
NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if( !is_open() ) {
DWORD e = GetLastError();
log() << "Create/Open File failed " << filename << ' ' << errnoWithDescription(e) << endl;
}
else
_bad = false;
}
static boost::intmax_t freeSpace(const string &path) {
ULARGE_INTEGER avail;
if( GetDiskFreeSpaceEx(toNativeString(path.c_str()).c_str(), &avail, NULL, NULL) ) {
return avail.QuadPart;
}
DWORD e = GetLastError();
log() << "GetDiskFreeSpaceEx fails errno: " << e << endl;
return -1;
}
void write(fileofs o, const char *data, unsigned len) {
LARGE_INTEGER li;
li.QuadPart = o;
SetFilePointerEx(fd, li, NULL, FILE_BEGIN);
DWORD written;
err( WriteFile(fd, data, len, &written, NULL) );
}
void read(fileofs o, char *data, unsigned len) {
DWORD read;
LARGE_INTEGER li;
li.QuadPart = o;
SetFilePointerEx(fd, li, NULL, FILE_BEGIN);
int ok = ReadFile(fd, data, len, &read, 0);
if( !ok )
err(ok);
else
massert( 10438 , "ReadFile error - truncated file?", read == len);
}
bool bad() { return _bad; }
bool is_open() { return fd != INVALID_HANDLE_VALUE; }
fileofs len() {
LARGE_INTEGER li;
li.LowPart = GetFileSize(fd, (DWORD *) &li.HighPart);
if( li.HighPart == 0 && li.LowPart == INVALID_FILE_SIZE ) {
err( false );
return 0;
}
return li.QuadPart;
}
void fsync() { FlushFileBuffers(fd); }
void truncate(fileofs size) {
if (len() <= size)
return;
LARGE_INTEGER li;
li.QuadPart = size;
if (SetFilePointerEx(fd, li, NULL, FILE_BEGIN) == 0){
err(false);
return; //couldn't seek
}
err(SetEndOfFile(fd));
}
};
#else
class File : public FileInterface {
public:
int fd;
private:
bool _bad;
void err(bool ok) {
if( !ok && !_bad ) {
_bad = true;
log() << "File I/O " << errnoWithDescription() << '\n';
}
}
public:
File() {
fd = -1;
_bad = true;
}
~File() {
if( is_open() ) ::close(fd);
fd = -1;
}
#ifndef O_NOATIME
#define O_NOATIME 0
#endif
void open(const char *filename, bool readOnly=false , bool direct=false) {
fd = ::open(filename,
O_CREAT | ( readOnly ? 0 : ( O_RDWR | O_NOATIME ) )
#if defined(O_DIRECT)
| ( direct ? O_DIRECT : 0 )
#endif
,
S_IRUSR | S_IWUSR);
if ( fd <= 0 ) {
out() << "couldn't open " << filename << ' ' << errnoWithDescription() << endl;
return;
}
_bad = false;
}
void write(fileofs o, const char *data, unsigned len) {
err( ::pwrite(fd, data, len, o) == (int) len );
}
void read(fileofs o, char *data, unsigned len) {
ssize_t s = ::pread(fd, data, len, o);
if( s == -1 ) {
err(false);
}
else if( s != (int) len ) {
_bad = true;
log() << "File error read:" << s << " bytes, wanted:" << len << " ofs:" << o << endl;
}
}
bool bad() { return _bad; }
bool is_open() { return fd > 0; }
fileofs len() {
off_t o = lseek(fd, 0, SEEK_END);
if( o != (off_t) -1 )
return o;
err(false);
return 0;
}
void fsync() { ::fsync(fd); }
static boost::intmax_t freeSpace ( const string &path ) {
struct statvfs info;
assert( !statvfs( path.c_str() , &info ) );
return boost::intmax_t( info.f_bavail ) * info.f_frsize;
}
void truncate(fileofs size) {
if (len() <= size)
return;
err(ftruncate(fd, size) == 0);
}
};
#endif
}
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