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Improve error reporting. (#327)

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This commit is contained in:
Nuno Cruces
2025-10-17 16:40:15 +01:00
committed by GitHub
parent 0b040d3f09
commit b65e894849
22 changed files with 203 additions and 191 deletions
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2
.github/workflows/libc.yml vendored
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@@ -10,7 +10,7 @@ jobs:
test: test:
strategy: strategy:
matrix: matrix:
os: [ubuntu-24.04, ubuntu-24.04-arm, macos-13, macos-15] os: [ubuntu-24.04, ubuntu-24.04-arm, macos-15, macos-15-intel]
runs-on: ${{ matrix.os }} runs-on: ${{ matrix.os }}
steps: steps:

2
.github/workflows/test.yml vendored
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@@ -224,7 +224,7 @@ jobs:
run: go test -v ./... run: go test -v ./...
test-macintel: test-macintel:
runs-on: macos-13 runs-on: macos-15-intel
needs: test needs: test
steps: steps:

4
error.go
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@@ -40,6 +40,10 @@ func (e *Error) Error() string {
b.WriteString(": ") b.WriteString(": ")
b.WriteString(e.msg) b.WriteString(e.msg)
} }
if e.sys != nil {
b.WriteString(": ")
b.WriteString(e.sys.Error())
}
return b.String() return b.String()
} }

2
sqlite.go
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@@ -132,7 +132,7 @@ func (sqlt *sqlite) error(rc res_t, handle ptr_t, sql ...string) error {
msg = strings.TrimPrefix(msg, "sqlite3: ") msg = strings.TrimPrefix(msg, "sqlite3: ")
msg = strings.TrimPrefix(msg, util.ErrorCodeString(rc)[len("sqlite3: "):]) msg = strings.TrimPrefix(msg, util.ErrorCodeString(rc)[len("sqlite3: "):])
msg = strings.TrimPrefix(msg, ": ") msg = strings.TrimPrefix(msg, ": ")
if msg == "not an error" { if msg == "" || msg == "not an error" {
msg = "" msg = ""
} }
} }

8
vfs/api.go
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@@ -10,7 +10,8 @@ import (
// A VFS defines the interface between the SQLite core and the underlying operating system. // A VFS defines the interface between the SQLite core and the underlying operating system.
// //
// Use sqlite3.ErrorCode or sqlite3.ExtendedErrorCode to return specific error codes to SQLite. // Use [SystemError], sqlite3.ErrorCode, or sqlite3.ExtendedErrorCode
// to return specific error codes to SQLite.
// //
// https://sqlite.org/c3ref/vfs.html // https://sqlite.org/c3ref/vfs.html
type VFS interface { type VFS interface {
@@ -31,8 +32,9 @@ type VFSFilename interface {
// A File represents an open file in the OS interface layer. // A File represents an open file in the OS interface layer.
// //
// Use sqlite3.ErrorCode or sqlite3.ExtendedErrorCode to return specific error codes to SQLite. // Use [SystemError], sqlite3.ErrorCode, or sqlite3.ExtendedErrorCode
// In particular, sqlite3.BUSY is necessary to correctly implement lock methods. // to return specific error codes to SQLite.
// In particular, sqlite3.BUSY is needed to correctly implement lock methods.
// //
// https://sqlite.org/c3ref/io_methods.html // https://sqlite.org/c3ref/io_methods.html
type File interface { type File interface {

2
vfs/const.go
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@@ -24,7 +24,7 @@ func (e _ErrorCode) Error() string {
} }
const ( const (
_OK _ErrorCode = util.OK _OK = util.OK
_ERROR _ErrorCode = util.ERROR _ERROR _ErrorCode = util.ERROR
_PERM _ErrorCode = util.PERM _PERM _ErrorCode = util.PERM
_BUSY _ErrorCode = util.BUSY _BUSY _ErrorCode = util.BUSY

2
vfs/file.go
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@@ -48,7 +48,7 @@ func (vfsOS) Delete(path string, syncDir bool) error {
if isUnix && syncDir { if isUnix && syncDir {
f, err := os.Open(filepath.Dir(path)) f, err := os.Open(filepath.Dir(path))
if err != nil { if err != nil {
return _OK return nil
} }
defer f.Close() defer f.Close()
err = osSync(f, 0, SYNC_FULL) err = osSync(f, 0, SYNC_FULL)

20
vfs/lock.go
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@@ -51,8 +51,8 @@ func (f *vfsFile) Lock(lock LockLevel) error {
if f.lock != LOCK_NONE { if f.lock != LOCK_NONE {
panic(util.AssertErr()) panic(util.AssertErr())
} }
if rc := osGetSharedLock(f.File); rc != _OK { if err := osGetSharedLock(f.File); err != nil {
return rc return err
} }
f.lock = LOCK_SHARED f.lock = LOCK_SHARED
return nil return nil
@@ -62,8 +62,8 @@ func (f *vfsFile) Lock(lock LockLevel) error {
if f.lock != LOCK_SHARED { if f.lock != LOCK_SHARED {
panic(util.AssertErr()) panic(util.AssertErr())
} }
if rc := osGetReservedLock(f.File); rc != _OK { if err := osGetReservedLock(f.File); err != nil {
return rc return err
} }
f.lock = LOCK_RESERVED f.lock = LOCK_RESERVED
return nil return nil
@@ -73,8 +73,8 @@ func (f *vfsFile) Lock(lock LockLevel) error {
if f.lock <= LOCK_NONE || f.lock >= LOCK_EXCLUSIVE { if f.lock <= LOCK_NONE || f.lock >= LOCK_EXCLUSIVE {
panic(util.AssertErr()) panic(util.AssertErr())
} }
if rc := osGetExclusiveLock(f.File, &f.lock); rc != _OK { if err := osGetExclusiveLock(f.File, &f.lock); err != nil {
return rc return err
} }
f.lock = LOCK_EXCLUSIVE f.lock = LOCK_EXCLUSIVE
return nil return nil
@@ -101,14 +101,14 @@ func (f *vfsFile) Unlock(lock LockLevel) error {
switch lock { switch lock {
case LOCK_SHARED: case LOCK_SHARED:
rc := osDowngradeLock(f.File, f.lock) err := osDowngradeLock(f.File, f.lock)
f.lock = LOCK_SHARED f.lock = LOCK_SHARED
return rc return err
case LOCK_NONE: case LOCK_NONE:
rc := osReleaseLock(f.File, f.lock) err := osReleaseLock(f.File, f.lock)
f.lock = LOCK_NONE f.lock = LOCK_NONE
return rc return err
default: default:
panic(util.AssertErr()) panic(util.AssertErr())

48
vfs/os_bsd.go
View File

@@ -8,13 +8,13 @@ import (
"golang.org/x/sys/unix" "golang.org/x/sys/unix"
) )
func osGetSharedLock(file *os.File) _ErrorCode { func osGetSharedLock(file *os.File) error {
return osFlock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK) return osFlock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK)
} }
func osGetReservedLock(file *os.File) _ErrorCode { func osGetReservedLock(file *os.File) error {
rc := osFlock(file, unix.LOCK_EX|unix.LOCK_NB, _IOERR_LOCK) err := osFlock(file, unix.LOCK_EX|unix.LOCK_NB, _IOERR_LOCK)
if rc == _BUSY { if err == _BUSY {
// The documentation states that a lock is upgraded by // The documentation states that a lock is upgraded by
// releasing the previous lock, then acquiring the new lock. // releasing the previous lock, then acquiring the new lock.
// Going over the source code of various BSDs, though, // Going over the source code of various BSDs, though,
@@ -26,19 +26,19 @@ func osGetReservedLock(file *os.File) _ErrorCode {
// and invoke the busy handler if appropriate. // and invoke the busy handler if appropriate.
return _BUSY_SNAPSHOT return _BUSY_SNAPSHOT
} }
return rc return err
} }
func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode { func osGetExclusiveLock(file *os.File, state *LockLevel) error {
if *state >= LOCK_RESERVED { if *state >= LOCK_RESERVED {
return _OK return nil
} }
return osGetReservedLock(file) return osGetReservedLock(file)
} }
func osDowngradeLock(file *os.File, _ LockLevel) _ErrorCode { func osDowngradeLock(file *os.File, _ LockLevel) error {
rc := osFlock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK) err := osFlock(file, unix.LOCK_SH|unix.LOCK_NB, _IOERR_RDLOCK)
if rc == _BUSY { if err == _BUSY {
// The documentation states that a lock is downgraded by // The documentation states that a lock is downgraded by
// releasing the previous lock then acquiring the new lock. // releasing the previous lock then acquiring the new lock.
// Going over the source code of various BSDs, though, // Going over the source code of various BSDs, though,
@@ -46,44 +46,44 @@ func osDowngradeLock(file *os.File, _ LockLevel) _ErrorCode {
// Return IOERR_RDLOCK, as BUSY would cause an assert to fail. // Return IOERR_RDLOCK, as BUSY would cause an assert to fail.
return _IOERR_RDLOCK return _IOERR_RDLOCK
} }
return _OK return err
} }
func osReleaseLock(file *os.File, _ LockLevel) _ErrorCode { func osReleaseLock(file *os.File, _ LockLevel) error {
for { for {
err := unix.Flock(int(file.Fd()), unix.LOCK_UN) err := unix.Flock(int(file.Fd()), unix.LOCK_UN)
if err == nil { if err == nil {
return _OK return nil
} }
if err != unix.EINTR { if err != unix.EINTR {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
} }
} }
func osCheckReservedLock(file *os.File) (bool, _ErrorCode) { func osCheckReservedLock(file *os.File) (bool, error) {
// Test the RESERVED lock with fcntl(F_GETLK). // Test the RESERVED lock with fcntl(F_GETLK).
// This only works on systems where fcntl and flock are compatible. // This only works on systems where fcntl and flock are compatible.
// However, SQLite only calls this while holding a shared lock, // However, SQLite only calls this while holding a shared lock,
// so the difference is immaterial. // so the difference is immaterial.
lock, rc := osTestLock(file, _RESERVED_BYTE, 1) lock, err := osTestLock(file, _RESERVED_BYTE, 1, _IOERR_CHECKRESERVEDLOCK)
return lock == unix.F_WRLCK, rc return lock == unix.F_WRLCK, err
} }
func osFlock(file *os.File, how int, def _ErrorCode) _ErrorCode { func osFlock(file *os.File, how int, def _ErrorCode) error {
err := unix.Flock(int(file.Fd()), how) err := unix.Flock(int(file.Fd()), how)
return osLockErrorCode(err, def) return osLockErrorCode(err, def)
} }
func osReadLock(file *os.File, start, len int64) _ErrorCode { func osReadLock(file *os.File, start, len int64) error {
return osLock(file, unix.F_RDLCK, start, len, _IOERR_RDLOCK) return osLock(file, unix.F_RDLCK, start, len, _IOERR_RDLOCK)
} }
func osWriteLock(file *os.File, start, len int64) _ErrorCode { func osWriteLock(file *os.File, start, len int64) error {
return osLock(file, unix.F_WRLCK, start, len, _IOERR_LOCK) return osLock(file, unix.F_WRLCK, start, len, _IOERR_LOCK)
} }
func osLock(file *os.File, typ int16, start, len int64, def _ErrorCode) _ErrorCode { func osLock(file *os.File, typ int16, start, len int64, def _ErrorCode) error {
err := unix.FcntlFlock(file.Fd(), unix.F_SETLK, &unix.Flock_t{ err := unix.FcntlFlock(file.Fd(), unix.F_SETLK, &unix.Flock_t{
Type: typ, Type: typ,
Start: start, Start: start,
@@ -92,7 +92,7 @@ func osLock(file *os.File, typ int16, start, len int64, def _ErrorCode) _ErrorCo
return osLockErrorCode(err, def) return osLockErrorCode(err, def)
} }
func osUnlock(file *os.File, start, len int64) _ErrorCode { func osUnlock(file *os.File, start, len int64) error {
lock := unix.Flock_t{ lock := unix.Flock_t{
Type: unix.F_UNLCK, Type: unix.F_UNLCK,
Start: start, Start: start,
@@ -101,10 +101,10 @@ func osUnlock(file *os.File, start, len int64) _ErrorCode {
for { for {
err := unix.FcntlFlock(file.Fd(), unix.F_SETLK, &lock) err := unix.FcntlFlock(file.Fd(), unix.F_SETLK, &lock)
if err == nil { if err == nil {
return _OK return nil
} }
if err != unix.EINTR { if err != unix.EINTR {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
} }
} }

12
vfs/os_darwin.go
View File

@@ -75,15 +75,15 @@ func osAllocate(file *os.File, size int64) error {
return file.Truncate(size) return file.Truncate(size)
} }
func osReadLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode { func osReadLock(file *os.File, start, len int64, timeout time.Duration) error {
return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK) return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK)
} }
func osWriteLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode { func osWriteLock(file *os.File, start, len int64, timeout time.Duration) error {
return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK) return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK)
} }
func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) _ErrorCode { func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) error {
lock := &flocktimeout_t{fl: unix.Flock_t{ lock := &flocktimeout_t{fl: unix.Flock_t{
Type: typ, Type: typ,
Start: start, Start: start,
@@ -103,7 +103,7 @@ func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, d
return osLockErrorCode(err, def) return osLockErrorCode(err, def)
} }
func osUnlock(file *os.File, start, len int64) _ErrorCode { func osUnlock(file *os.File, start, len int64) error {
lock := unix.Flock_t{ lock := unix.Flock_t{
Type: unix.F_UNLCK, Type: unix.F_UNLCK,
Start: start, Start: start,
@@ -112,10 +112,10 @@ func osUnlock(file *os.File, start, len int64) _ErrorCode {
for { for {
err := unix.FcntlFlock(file.Fd(), _F_OFD_SETLK, &lock) err := unix.FcntlFlock(file.Fd(), _F_OFD_SETLK, &lock)
if err == nil { if err == nil {
return _OK return nil
} }
if err != unix.EINTR { if err != unix.EINTR {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
} }
} }

31
vfs/os_dotlk.go
View File

@@ -23,7 +23,7 @@ type vfsDotLocker struct {
reserved *os.File // +checklocks:vfsDotLocksMtx reserved *os.File // +checklocks:vfsDotLocksMtx
} }
func osGetSharedLock(file *os.File) _ErrorCode { func osGetSharedLock(file *os.File) error {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
@@ -34,7 +34,7 @@ func osGetSharedLock(file *os.File) _ErrorCode {
if errors.Is(err, fs.ErrExist) { if errors.Is(err, fs.ErrExist) {
return _BUSY // Another process has the lock. return _BUSY // Another process has the lock.
} }
return _IOERR_LOCK return sysError{err, _IOERR_LOCK}
} }
locker = &vfsDotLocker{} locker = &vfsDotLocker{}
vfsDotLocks[name] = locker vfsDotLocks[name] = locker
@@ -44,10 +44,10 @@ func osGetSharedLock(file *os.File) _ErrorCode {
return _BUSY return _BUSY
} }
locker.shared++ locker.shared++
return _OK return nil
} }
func osGetReservedLock(file *os.File) _ErrorCode { func osGetReservedLock(file *os.File) error {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
@@ -61,10 +61,10 @@ func osGetReservedLock(file *os.File) _ErrorCode {
return _BUSY return _BUSY
} }
locker.reserved = file locker.reserved = file
return _OK return nil
} }
func osGetExclusiveLock(file *os.File, _ *LockLevel) _ErrorCode { func osGetExclusiveLock(file *os.File, _ *LockLevel) error {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
@@ -81,10 +81,10 @@ func osGetExclusiveLock(file *os.File, _ *LockLevel) _ErrorCode {
if locker.shared > 1 { if locker.shared > 1 {
return _BUSY return _BUSY
} }
return _OK return nil
} }
func osDowngradeLock(file *os.File, _ LockLevel) _ErrorCode { func osDowngradeLock(file *os.File, _ LockLevel) error {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
@@ -100,10 +100,10 @@ func osDowngradeLock(file *os.File, _ LockLevel) _ErrorCode {
if locker.pending == file { if locker.pending == file {
locker.pending = nil locker.pending = nil
} }
return _OK return nil
} }
func osReleaseLock(file *os.File, state LockLevel) _ErrorCode { func osReleaseLock(file *os.File, state LockLevel) error {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
@@ -115,7 +115,7 @@ func osReleaseLock(file *os.File, state LockLevel) _ErrorCode {
if locker.shared == 1 { if locker.shared == 1 {
if err := dotlk.Unlock(name + ".lock"); err != nil { if err := dotlk.Unlock(name + ".lock"); err != nil {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
delete(vfsDotLocks, name) delete(vfsDotLocks, name)
} }
@@ -127,17 +127,14 @@ func osReleaseLock(file *os.File, state LockLevel) _ErrorCode {
locker.pending = nil locker.pending = nil
} }
locker.shared-- locker.shared--
return _OK return nil
} }
func osCheckReservedLock(file *os.File) (bool, _ErrorCode) { func osCheckReservedLock(file *os.File) (bool, error) {
vfsDotLocksMtx.Lock() vfsDotLocksMtx.Lock()
defer vfsDotLocksMtx.Unlock() defer vfsDotLocksMtx.Unlock()
name := file.Name() name := file.Name()
locker := vfsDotLocks[name] locker := vfsDotLocks[name]
if locker == nil { return locker != nil && locker.reserved != nil, nil
return false, _OK
}
return locker.reserved != nil, _OK
} }

12
vfs/os_linux.go
View File

@@ -44,15 +44,15 @@ func osAllocate(file *os.File, size int64) error {
} }
func osReadLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode { func osReadLock(file *os.File, start, len int64, timeout time.Duration) error {
return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK) return osLock(file, unix.F_RDLCK, start, len, timeout, _IOERR_RDLOCK)
} }
func osWriteLock(file *os.File, start, len int64, timeout time.Duration) _ErrorCode { func osWriteLock(file *os.File, start, len int64, timeout time.Duration) error {
return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK) return osLock(file, unix.F_WRLCK, start, len, timeout, _IOERR_LOCK)
} }
func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) _ErrorCode { func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, def _ErrorCode) error {
lock := unix.Flock_t{ lock := unix.Flock_t{
Type: typ, Type: typ,
Start: start, Start: start,
@@ -68,7 +68,7 @@ func osLock(file *os.File, typ int16, start, len int64, timeout time.Duration, d
return osLockErrorCode(err, def) return osLockErrorCode(err, def)
} }
func osUnlock(file *os.File, start, len int64) _ErrorCode { func osUnlock(file *os.File, start, len int64) error {
lock := unix.Flock_t{ lock := unix.Flock_t{
Type: unix.F_UNLCK, Type: unix.F_UNLCK,
Start: start, Start: start,
@@ -77,10 +77,10 @@ func osUnlock(file *os.File, start, len int64) _ErrorCode {
for { for {
err := unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock) err := unix.FcntlFlock(file.Fd(), unix.F_OFD_SETLK, &lock)
if err == nil { if err == nil {
return _OK return nil
} }
if err != unix.EINTR { if err != unix.EINTR {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
} }
} }

24
vfs/os_ofd.go
View File

@@ -9,25 +9,25 @@ import (
"golang.org/x/sys/unix" "golang.org/x/sys/unix"
) )
func osGetSharedLock(file *os.File) _ErrorCode { func osGetSharedLock(file *os.File) error {
// Test the PENDING lock before acquiring a new SHARED lock. // Test the PENDING lock before acquiring a new SHARED lock.
if lock, _ := osTestLock(file, _PENDING_BYTE, 1); lock == unix.F_WRLCK { if lock, _ := osTestLock(file, _PENDING_BYTE, 1, _IOERR); lock == unix.F_WRLCK {
return _BUSY return _BUSY
} }
// Acquire the SHARED lock. // Acquire the SHARED lock.
return osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0) return osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0)
} }
func osGetReservedLock(file *os.File) _ErrorCode { func osGetReservedLock(file *os.File) error {
// Acquire the RESERVED lock. // Acquire the RESERVED lock.
return osWriteLock(file, _RESERVED_BYTE, 1, 0) return osWriteLock(file, _RESERVED_BYTE, 1, 0)
} }
func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode { func osGetExclusiveLock(file *os.File, state *LockLevel) error {
if *state == LOCK_RESERVED { if *state == LOCK_RESERVED {
// A PENDING lock is needed before acquiring an EXCLUSIVE lock. // A PENDING lock is needed before acquiring an EXCLUSIVE lock.
if rc := osWriteLock(file, _PENDING_BYTE, 1, -1); rc != _OK { if err := osWriteLock(file, _PENDING_BYTE, 1, -1); err != nil {
return rc return err
} }
*state = LOCK_PENDING *state = LOCK_PENDING
} }
@@ -35,10 +35,10 @@ func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
return osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, time.Millisecond) return osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, time.Millisecond)
} }
func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode { func osDowngradeLock(file *os.File, state LockLevel) error {
if state >= LOCK_EXCLUSIVE { if state >= LOCK_EXCLUSIVE {
// Downgrade to a SHARED lock. // Downgrade to a SHARED lock.
if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK { if err := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); err != nil {
// notest // this should never happen // notest // this should never happen
return _IOERR_RDLOCK return _IOERR_RDLOCK
} }
@@ -47,13 +47,13 @@ func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode {
return osUnlock(file, _PENDING_BYTE, 2) return osUnlock(file, _PENDING_BYTE, 2)
} }
func osReleaseLock(file *os.File, _ LockLevel) _ErrorCode { func osReleaseLock(file *os.File, _ LockLevel) error {
// Release all locks. // Release all locks.
return osUnlock(file, 0, 0) return osUnlock(file, 0, 0)
} }
func osCheckReservedLock(file *os.File) (bool, _ErrorCode) { func osCheckReservedLock(file *os.File) (bool, error) {
// Test the RESERVED lock. // Test the RESERVED lock.
lock, rc := osTestLock(file, _RESERVED_BYTE, 1) lock, err := osTestLock(file, _RESERVED_BYTE, 1, _IOERR_CHECKRESERVEDLOCK)
return lock == unix.F_WRLCK, rc return lock == unix.F_WRLCK, err
} }

14
vfs/os_unix.go
View File

@@ -59,7 +59,7 @@ func osSetMode(file *os.File, modeof string) error {
return nil return nil
} }
func osTestLock(file *os.File, start, len int64) (int16, _ErrorCode) { func osTestLock(file *os.File, start, len int64, def _ErrorCode) (int16, error) {
lock := unix.Flock_t{ lock := unix.Flock_t{
Type: unix.F_WRLCK, Type: unix.F_WRLCK,
Start: start, Start: start,
@@ -68,17 +68,17 @@ func osTestLock(file *os.File, start, len int64) (int16, _ErrorCode) {
for { for {
err := unix.FcntlFlock(file.Fd(), unix.F_GETLK, &lock) err := unix.FcntlFlock(file.Fd(), unix.F_GETLK, &lock)
if err == nil { if err == nil {
return lock.Type, _OK return lock.Type, nil
} }
if err != unix.EINTR { if err != unix.EINTR {
return 0, _IOERR_CHECKRESERVEDLOCK return 0, sysError{err, def}
} }
} }
} }
func osLockErrorCode(err error, def _ErrorCode) _ErrorCode { func osLockErrorCode(err error, def _ErrorCode) error {
if err == nil { if err == nil {
return _OK return nil
} }
if errno, ok := err.(unix.Errno); ok { if errno, ok := err.(unix.Errno); ok {
switch errno { switch errno {
@@ -92,12 +92,12 @@ func osLockErrorCode(err error, def _ErrorCode) _ErrorCode {
unix.ETIMEDOUT: unix.ETIMEDOUT:
return _BUSY return _BUSY
case unix.EPERM: case unix.EPERM:
return _PERM return sysError{err, _PERM}
} }
// notest // usually EWOULDBLOCK == EAGAIN // notest // usually EWOULDBLOCK == EAGAIN
if errno == unix.EWOULDBLOCK && unix.EWOULDBLOCK != unix.EAGAIN { if errno == unix.EWOULDBLOCK && unix.EWOULDBLOCK != unix.EAGAIN {
return _BUSY return _BUSY
} }
} }
return def return sysError{err, def}
} }

69
vfs/os_windows.go
View File

@@ -26,25 +26,25 @@ func osWriteAt(file *os.File, p []byte, off int64) (int, error) {
return n, err return n, err
} }
func osGetSharedLock(file *os.File) _ErrorCode { func osGetSharedLock(file *os.File) error {
// Acquire the PENDING lock temporarily before acquiring a new SHARED lock. // Acquire the PENDING lock temporarily before acquiring a new SHARED lock.
rc := osReadLock(file, _PENDING_BYTE, 1, 0) err := osReadLock(file, _PENDING_BYTE, 1, 0)
if rc == _OK { if err == nil {
// Acquire the SHARED lock. // Acquire the SHARED lock.
rc = osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0) err = osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0)
// Release the PENDING lock. // Release the PENDING lock.
osUnlock(file, _PENDING_BYTE, 1) osUnlock(file, _PENDING_BYTE, 1)
} }
return rc return err
} }
func osGetReservedLock(file *os.File) _ErrorCode { func osGetReservedLock(file *os.File) error {
// Acquire the RESERVED lock. // Acquire the RESERVED lock.
return osWriteLock(file, _RESERVED_BYTE, 1, 0) return osWriteLock(file, _RESERVED_BYTE, 1, 0)
} }
func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode { func osGetExclusiveLock(file *os.File, state *LockLevel) error {
// A PENDING lock is needed before releasing the SHARED lock. // A PENDING lock is needed before releasing the SHARED lock.
if *state < LOCK_PENDING { if *state < LOCK_PENDING {
// If we were RESERVED, we can block indefinitely. // If we were RESERVED, we can block indefinitely.
@@ -52,8 +52,8 @@ func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
if *state == LOCK_RESERVED { if *state == LOCK_RESERVED {
timeout = -1 timeout = -1
} }
if rc := osWriteLock(file, _PENDING_BYTE, 1, timeout); rc != _OK { if err := osWriteLock(file, _PENDING_BYTE, 1, timeout); err != nil {
return rc return err
} }
*state = LOCK_PENDING *state = LOCK_PENDING
} }
@@ -63,25 +63,25 @@ func osGetExclusiveLock(file *os.File, state *LockLevel) _ErrorCode {
// Acquire the EXCLUSIVE lock. // Acquire the EXCLUSIVE lock.
// Can't wait here, because the file is not OVERLAPPED. // Can't wait here, because the file is not OVERLAPPED.
rc := osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, 0) err := osWriteLock(file, _SHARED_FIRST, _SHARED_SIZE, 0)
if rc != _OK { if err != nil {
// Reacquire the SHARED lock. // Reacquire the SHARED lock.
if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK { if err := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); err != nil {
// notest // this should never happen // notest // this should never happen
return _IOERR_RDLOCK return _IOERR_RDLOCK
} }
} }
return rc return err
} }
func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode { func osDowngradeLock(file *os.File, state LockLevel) error {
if state >= LOCK_EXCLUSIVE { if state >= LOCK_EXCLUSIVE {
// Release the EXCLUSIVE lock while holding the PENDING lock. // Release the EXCLUSIVE lock while holding the PENDING lock.
osUnlock(file, _SHARED_FIRST, _SHARED_SIZE) osUnlock(file, _SHARED_FIRST, _SHARED_SIZE)
// Reacquire the SHARED lock. // Reacquire the SHARED lock.
if rc := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); rc != _OK { if err := osReadLock(file, _SHARED_FIRST, _SHARED_SIZE, 0); err != nil {
// notest // this should never happen // notest // this should never happen
return _IOERR_RDLOCK return _IOERR_RDLOCK
} }
@@ -94,10 +94,10 @@ func osDowngradeLock(file *os.File, state LockLevel) _ErrorCode {
if state >= LOCK_PENDING { if state >= LOCK_PENDING {
osUnlock(file, _PENDING_BYTE, 1) osUnlock(file, _PENDING_BYTE, 1)
} }
return _OK return nil
} }
func osReleaseLock(file *os.File, state LockLevel) _ErrorCode { func osReleaseLock(file *os.File, state LockLevel) error {
// Release all locks, PENDING must be last. // Release all locks, PENDING must be last.
if state >= LOCK_RESERVED { if state >= LOCK_RESERVED {
osUnlock(file, _RESERVED_BYTE, 1) osUnlock(file, _RESERVED_BYTE, 1)
@@ -108,31 +108,32 @@ func osReleaseLock(file *os.File, state LockLevel) _ErrorCode {
if state >= LOCK_PENDING { if state >= LOCK_PENDING {
osUnlock(file, _PENDING_BYTE, 1) osUnlock(file, _PENDING_BYTE, 1)
} }
return _OK return nil
} }
func osCheckReservedLock(file *os.File) (bool, _ErrorCode) { func osCheckReservedLock(file *os.File) (bool, error) {
// Test the RESERVED lock. // Test the RESERVED lock.
rc := osLock(file, 0, _RESERVED_BYTE, 1, 0, _IOERR_CHECKRESERVEDLOCK) err := osLock(file, 0, _RESERVED_BYTE, 1, 0, _IOERR_CHECKRESERVEDLOCK)
if rc == _BUSY { if err == _BUSY {
return true, _OK return true, nil
} }
if rc == _OK { if err == nil {
// Release the RESERVED lock. // Release the RESERVED lock.
osUnlock(file, _RESERVED_BYTE, 1) osUnlock(file, _RESERVED_BYTE, 1)
return false, nil
} }
return false, rc return false, err
} }
func osReadLock(file *os.File, start, len uint32, timeout time.Duration) _ErrorCode { func osReadLock(file *os.File, start, len uint32, timeout time.Duration) error {
return osLock(file, 0, start, len, timeout, _IOERR_RDLOCK) return osLock(file, 0, start, len, timeout, _IOERR_RDLOCK)
} }
func osWriteLock(file *os.File, start, len uint32, timeout time.Duration) _ErrorCode { func osWriteLock(file *os.File, start, len uint32, timeout time.Duration) error {
return osLock(file, windows.LOCKFILE_EXCLUSIVE_LOCK, start, len, timeout, _IOERR_LOCK) return osLock(file, windows.LOCKFILE_EXCLUSIVE_LOCK, start, len, timeout, _IOERR_LOCK)
} }
func osLock(file *os.File, flags, start, len uint32, timeout time.Duration, def _ErrorCode) _ErrorCode { func osLock(file *os.File, flags, start, len uint32, timeout time.Duration, def _ErrorCode) error {
var err error var err error
switch { switch {
default: default:
@@ -143,16 +144,16 @@ func osLock(file *os.File, flags, start, len uint32, timeout time.Duration, def
return osLockErrorCode(err, def) return osLockErrorCode(err, def)
} }
func osUnlock(file *os.File, start, len uint32) _ErrorCode { func osUnlock(file *os.File, start, len uint32) error {
err := windows.UnlockFileEx(windows.Handle(file.Fd()), err := windows.UnlockFileEx(windows.Handle(file.Fd()),
0, len, 0, &windows.Overlapped{Offset: start}) 0, len, 0, &windows.Overlapped{Offset: start})
if err == windows.ERROR_NOT_LOCKED { if err == windows.ERROR_NOT_LOCKED {
return _OK return nil
} }
if err != nil { if err != nil {
return _IOERR_UNLOCK return sysError{err, _IOERR_UNLOCK}
} }
return _OK return nil
} }
func osLockEx(file *os.File, flags, start, len uint32) error { func osLockEx(file *os.File, flags, start, len uint32) error {
@@ -160,9 +161,9 @@ func osLockEx(file *os.File, flags, start, len uint32) error {
0, len, 0, &windows.Overlapped{Offset: start}) 0, len, 0, &windows.Overlapped{Offset: start})
} }
func osLockErrorCode(err error, def _ErrorCode) _ErrorCode { func osLockErrorCode(err error, def _ErrorCode) error {
if err == nil { if err == nil {
return _OK return nil
} }
if errno, ok := err.(windows.Errno); ok { if errno, ok := err.(windows.Errno); ok {
// https://devblogs.microsoft.com/oldnewthing/20140905-00/?p=63 // https://devblogs.microsoft.com/oldnewthing/20140905-00/?p=63
@@ -175,5 +176,5 @@ func osLockErrorCode(err error, def _ErrorCode) _ErrorCode {
return _BUSY return _BUSY
} }
} }
return def return sysError{err, def}
} }

61
vfs/shm_bsd.go
View File

@@ -3,6 +3,7 @@
package vfs package vfs
import ( import (
"cmp"
"context" "context"
"errors" "errors"
"io" "io"
@@ -68,9 +69,9 @@ func (s *vfsShm) Close() error {
panic(util.AssertErr()) panic(util.AssertErr())
} }
func (s *vfsShm) shmOpen() (rc _ErrorCode) { func (s *vfsShm) shmOpen() (err error) {
if s.vfsShmParent != nil { if s.vfsShmParent != nil {
return _OK return nil
} }
vfsShmListMtx.Lock() vfsShmListMtx.Lock()
@@ -80,7 +81,7 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
// Closing it would release all POSIX locks on it. // Closing it would release all POSIX locks on it.
fi, err := os.Stat(s.path) fi, err := os.Stat(s.path)
if err != nil && !errors.Is(err, fs.ErrNotExist) { if err != nil && !errors.Is(err, fs.ErrNotExist) {
return _IOERR_FSTAT return sysError{err, _IOERR_FSTAT}
} }
// Find a shared file, increase the reference count. // Find a shared file, increase the reference count.
@@ -88,7 +89,7 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
if g != nil && os.SameFile(fi, g.info) { if g != nil && os.SameFile(fi, g.info) {
s.vfsShmParent = g s.vfsShmParent = g
g.refs++ g.refs++
return _OK return nil
} }
} }
@@ -96,34 +97,34 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
f, err := os.OpenFile(s.path, f, err := os.OpenFile(s.path,
os.O_RDWR|os.O_CREATE|_O_NOFOLLOW, 0666) os.O_RDWR|os.O_CREATE|_O_NOFOLLOW, 0666)
if err != nil { if err != nil {
return _CANTOPEN return sysError{err, _CANTOPEN}
} }
defer func() { defer func() {
if rc != _OK { if err != nil {
f.Close() f.Close()
} }
}() }()
// Dead man's switch. // Dead man's switch.
if lock, rc := osTestLock(f, _SHM_DMS, 1); rc != _OK { if lock, err := osTestLock(f, _SHM_DMS, 1, _IOERR_LOCK); err != nil {
return _IOERR_LOCK return err
} else if lock == unix.F_WRLCK { } else if lock == unix.F_WRLCK {
return _BUSY return _BUSY
} else if lock == unix.F_UNLCK { } else if lock == unix.F_UNLCK {
if rc := osWriteLock(f, _SHM_DMS, 1); rc != _OK { if err := osWriteLock(f, _SHM_DMS, 1); err != nil {
return rc return err
} }
if err := f.Truncate(0); err != nil { if err := f.Truncate(0); err != nil {
return _IOERR_SHMOPEN return sysError{err, _IOERR_SHMOPEN}
} }
} }
if rc := osReadLock(f, _SHM_DMS, 1); rc != _OK { if err := osReadLock(f, _SHM_DMS, 1); err != nil {
return rc return err
} }
fi, err = f.Stat() fi, err = f.Stat()
if err != nil { if err != nil {
return _IOERR_FSTAT return sysError{err, _IOERR_FSTAT}
} }
// Add the new shared file. // Add the new shared file.
@@ -134,11 +135,11 @@ func (s *vfsShm) shmOpen() (rc _ErrorCode) {
for i, g := range vfsShmList { for i, g := range vfsShmList {
if g == nil { if g == nil {
vfsShmList[i] = s.vfsShmParent vfsShmList[i] = s.vfsShmParent
return _OK return nil
} }
} }
vfsShmList = append(vfsShmList, s.vfsShmParent) vfsShmList = append(vfsShmList, s.vfsShmParent)
return _OK return nil
} }
func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) { func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) {
@@ -147,8 +148,8 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
return 0, _IOERR_SHMMAP return 0, _IOERR_SHMMAP
} }
if rc := s.shmOpen(); rc != _OK { if err := s.shmOpen(); err != nil {
return 0, rc return 0, err
} }
// Check if file is big enough. // Check if file is big enough.
@@ -182,9 +183,9 @@ func (s *vfsShm) shmLock(offset, n int32, flags _ShmFlag) error {
defer s.Unlock() defer s.Unlock()
// Check if we can obtain/release locks locally. // Check if we can obtain/release locks locally.
rc := s.shmMemLock(offset, n, flags) err := s.shmMemLock(offset, n, flags)
if rc != _OK { if err != nil {
return rc return err
} }
// Obtain/release the appropriate file locks. // Obtain/release the appropriate file locks.
@@ -196,36 +197,38 @@ func (s *vfsShm) shmLock(offset, n int32, flags _ShmFlag) error {
for i := begin; i < end; i++ { for i := begin; i < end; i++ {
if s.vfsShmParent.lock[i] != 0 { if s.vfsShmParent.lock[i] != 0 {
if i > begin { if i > begin {
rc |= osUnlock(s.File, _SHM_BASE+int64(begin), int64(i-begin)) err = cmp.Or(err,
osUnlock(s.File, _SHM_BASE+int64(begin), int64(i-begin)))
} }
begin = i + 1 begin = i + 1
} }
} }
if end > begin { if end > begin {
rc |= osUnlock(s.File, _SHM_BASE+int64(begin), int64(end-begin)) err = cmp.Or(err,
osUnlock(s.File, _SHM_BASE+int64(begin), int64(end-begin)))
} }
return rc return err
case flags&_SHM_SHARED != 0: case flags&_SHM_SHARED != 0:
// Acquiring a new shared lock on the file is only necessary // Acquiring a new shared lock on the file is only necessary
// if there was a new shared lock in the range. // if there was a new shared lock in the range.
for i := offset; i < offset+n; i++ { for i := offset; i < offset+n; i++ {
if s.vfsShmParent.lock[i] == 1 { if s.vfsShmParent.lock[i] == 1 {
rc = osReadLock(s.File, _SHM_BASE+int64(offset), int64(n)) err = osReadLock(s.File, _SHM_BASE+int64(offset), int64(n))
break break
} }
} }
case flags&_SHM_EXCLUSIVE != 0: case flags&_SHM_EXCLUSIVE != 0:
// Acquiring an exclusive lock on the file is always necessary. // Acquiring an exclusive lock on the file is always necessary.
rc = osWriteLock(s.File, _SHM_BASE+int64(offset), int64(n)) err = osWriteLock(s.File, _SHM_BASE+int64(offset), int64(n))
default: default:
panic(util.AssertErr()) panic(util.AssertErr())
} }
// Release the local locks we had acquired. if err != nil {
if rc != _OK { // Release the local locks we had acquired.
s.shmMemLock(offset, n, flags^(_SHM_UNLOCK|_SHM_LOCK)) s.shmMemLock(offset, n, flags^(_SHM_UNLOCK|_SHM_LOCK))
} }
return rc return err
} }
func (s *vfsShm) shmUnmap(delete bool) { func (s *vfsShm) shmUnmap(delete bool) {

2
vfs/shm_copy.go
View File

@@ -32,7 +32,7 @@ const (
// https://sqlite.org/walformat.html#the_wal_index_file_format // https://sqlite.org/walformat.html#the_wal_index_file_format
func (s *vfsShm) shmAcquire(errp *error) { func (s *vfsShm) shmAcquire(errp *error) {
if errp != nil && *errp != _OK { if errp != nil && *errp != nil {
return return
} }
if len(s.ptrs) == 0 || shmEqual(s.shadow[0][:], s.shared[0][:]) { if len(s.ptrs) == 0 || shmEqual(s.shadow[0][:], s.shared[0][:]) {

14
vfs/shm_dotlk.go
View File

@@ -66,9 +66,9 @@ func (s *vfsShm) Close() error {
return nil return nil
} }
func (s *vfsShm) shmOpen() _ErrorCode { func (s *vfsShm) shmOpen() error {
if s.vfsShmParent != nil { if s.vfsShmParent != nil {
return _OK return nil
} }
vfsShmListMtx.Lock() vfsShmListMtx.Lock()
@@ -78,7 +78,7 @@ func (s *vfsShm) shmOpen() _ErrorCode {
if g, ok := vfsShmList[s.path]; ok { if g, ok := vfsShmList[s.path]; ok {
s.vfsShmParent = g s.vfsShmParent = g
g.refs++ g.refs++
return _OK return nil
} }
// Dead man's switch. // Dead man's switch.
@@ -87,13 +87,13 @@ func (s *vfsShm) shmOpen() _ErrorCode {
return _BUSY return _BUSY
} }
if err != nil { if err != nil {
return _IOERR_LOCK return sysError{err, _IOERR_LOCK}
} }
// Add the new shared buffer. // Add the new shared buffer.
s.vfsShmParent = &vfsShmParent{} s.vfsShmParent = &vfsShmParent{}
vfsShmList[s.path] = s.vfsShmParent vfsShmList[s.path] = s.vfsShmParent
return _OK return nil
} }
func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) { func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) {
@@ -105,8 +105,8 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
s.free = mod.ExportedFunction("sqlite3_free") s.free = mod.ExportedFunction("sqlite3_free")
s.alloc = mod.ExportedFunction("sqlite3_malloc64") s.alloc = mod.ExportedFunction("sqlite3_malloc64")
} }
if rc := s.shmOpen(); rc != _OK { if err := s.shmOpen(); err != nil {
return 0, rc return 0, err
} }
s.Lock() s.Lock()

5
vfs/shm_memlk.go
View File

@@ -5,7 +5,7 @@ package vfs
import "github.com/ncruces/go-sqlite3/internal/util" import "github.com/ncruces/go-sqlite3/internal/util"
// +checklocks:s.Mutex // +checklocks:s.Mutex
func (s *vfsShm) shmMemLock(offset, n int32, flags _ShmFlag) _ErrorCode { func (s *vfsShm) shmMemLock(offset, n int32, flags _ShmFlag) error {
switch { switch {
case flags&_SHM_UNLOCK != 0: case flags&_SHM_UNLOCK != 0:
for i := offset; i < offset+n; i++ { for i := offset; i < offset+n; i++ {
@@ -48,6 +48,5 @@ func (s *vfsShm) shmMemLock(offset, n int32, flags _ShmFlag) _ErrorCode {
default: default:
panic(util.AssertErr()) panic(util.AssertErr())
} }
return nil
return _OK
} }

32
vfs/shm_ofd.go
View File

@@ -27,7 +27,10 @@ type vfsShm struct {
var _ blockingSharedMemory = &vfsShm{} var _ blockingSharedMemory = &vfsShm{}
func (s *vfsShm) shmOpen() _ErrorCode { func (s *vfsShm) shmOpen() error {
if s.fileLock {
return nil
}
if s.File == nil { if s.File == nil {
f, err := os.OpenFile(s.path, f, err := os.OpenFile(s.path,
os.O_RDWR|os.O_CREATE|_O_NOFOLLOW, 0666) os.O_RDWR|os.O_CREATE|_O_NOFOLLOW, 0666)
@@ -37,17 +40,15 @@ func (s *vfsShm) shmOpen() _ErrorCode {
s.readOnly = true s.readOnly = true
} }
if err != nil { if err != nil {
return _CANTOPEN return sysError{err, _CANTOPEN}
} }
s.fileLock = false
s.File = f s.File = f
} }
if s.fileLock {
return _OK
}
// Dead man's switch. // Dead man's switch.
if lock, rc := osTestLock(s.File, _SHM_DMS, 1); rc != _OK { if lock, err := osTestLock(s.File, _SHM_DMS, 1, _IOERR_LOCK); err != nil {
return _IOERR_LOCK return err
} else if lock == unix.F_WRLCK { } else if lock == unix.F_WRLCK {
return _BUSY return _BUSY
} else if lock == unix.F_UNLCK { } else if lock == unix.F_UNLCK {
@@ -61,16 +62,16 @@ func (s *vfsShm) shmOpen() _ErrorCode {
// but only downgrade it to a shared lock. // but only downgrade it to a shared lock.
// So no point in blocking here. // So no point in blocking here.
// The call below to obtain the shared DMS lock may use a blocking lock. // The call below to obtain the shared DMS lock may use a blocking lock.
if rc := osWriteLock(s.File, _SHM_DMS, 1, 0); rc != _OK { if err := osWriteLock(s.File, _SHM_DMS, 1, 0); err != nil {
return rc return err
} }
if err := s.Truncate(0); err != nil { if err := s.Truncate(0); err != nil {
return _IOERR_SHMOPEN return sysError{err, _IOERR_SHMOPEN}
} }
} }
rc := osReadLock(s.File, _SHM_DMS, 1, time.Millisecond) err := osReadLock(s.File, _SHM_DMS, 1, time.Millisecond)
s.fileLock = rc == _OK s.fileLock = err == nil
return rc return err
} }
func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) { func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (ptr_t, error) {
@@ -79,8 +80,8 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
return 0, _IOERR_SHMMAP return 0, _IOERR_SHMMAP
} }
if rc := s.shmOpen(); rc != _OK { if err := s.shmOpen(); err != nil {
return 0, rc return 0, err
} }
// Check if file is big enough. // Check if file is big enough.
@@ -170,6 +171,7 @@ func (s *vfsShm) shmUnmap(delete bool) {
} }
s.Close() s.Close()
s.File = nil s.File = nil
s.fileLock = false
} }
func (s *vfsShm) shmBarrier() { func (s *vfsShm) shmBarrier() {

26
vfs/shm_windows.go
View File

@@ -40,29 +40,30 @@ func (s *vfsShm) Close() error {
return s.File.Close() return s.File.Close()
} }
func (s *vfsShm) shmOpen() _ErrorCode { func (s *vfsShm) shmOpen() error {
if s.fileLock {
return nil
}
if s.File == nil { if s.File == nil {
f, err := os.OpenFile(s.path, os.O_RDWR|os.O_CREATE, 0666) f, err := os.OpenFile(s.path, os.O_RDWR|os.O_CREATE, 0666)
if err != nil { if err != nil {
return _CANTOPEN return sysError{err, _CANTOPEN}
} }
s.fileLock = false
s.File = f s.File = f
} }
if s.fileLock {
return _OK
}
// Dead man's switch. // Dead man's switch.
if rc := osWriteLock(s.File, _SHM_DMS, 1, 0); rc == _OK { if osWriteLock(s.File, _SHM_DMS, 1, 0) == nil {
err := s.Truncate(0) err := s.Truncate(0)
osUnlock(s.File, _SHM_DMS, 1) osUnlock(s.File, _SHM_DMS, 1)
if err != nil { if err != nil {
return _IOERR_SHMOPEN return sysError{err, _IOERR_SHMOPEN}
} }
} }
rc := osReadLock(s.File, _SHM_DMS, 1, 0) err := osReadLock(s.File, _SHM_DMS, 1, 0)
s.fileLock = rc == _OK s.fileLock = err == nil
return rc return err
} }
func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (_ ptr_t, err error) { func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, extend bool) (_ ptr_t, err error) {
@@ -75,8 +76,8 @@ func (s *vfsShm) shmMap(ctx context.Context, mod api.Module, id, size int32, ext
s.free = mod.ExportedFunction("sqlite3_free") s.free = mod.ExportedFunction("sqlite3_free")
s.alloc = mod.ExportedFunction("sqlite3_malloc64") s.alloc = mod.ExportedFunction("sqlite3_malloc64")
} }
if rc := s.shmOpen(); rc != _OK { if err := s.shmOpen(); err != nil {
return 0, rc return 0, err
} }
defer s.shmAcquire(&err) defer s.shmAcquire(&err)
@@ -172,6 +173,7 @@ func (s *vfsShm) shmUnmap(delete bool) {
// Close the file. // Close the file.
s.Close() s.Close()
s.File = nil s.File = nil
s.fileLock = false
if delete { if delete {
os.Remove(s.path) os.Remove(s.path)
} }

2
vfs/vfs.go
View File

@@ -477,6 +477,8 @@ func vfsErrorCode(ctx context.Context, err error, code _ErrorCode) _ErrorCode {
return code return code
} }
// SystemError tags an error with a given
// sqlite3.ErrorCode or sqlite3.ExtendedErrorCode.
func SystemError[T interface{ ~uint8 | ~uint16 }](err error, code T) error { func SystemError[T interface{ ~uint8 | ~uint16 }](err error, code T) error {
if err == nil { if err == nil {
return nil return nil