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Overview
Comment:Get read-only SHM file tests passing on Win32.
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SHA3-256: abef05353554e72f4d08aff562b87ff8530e8537a79e58d831205ea8c46eed07
User & Date: mistachkin 2017-11-09 20:02:44
Context
2017-11-09
20:34
Enhance walro2.test to better ensure that readonly_shm clients are not using invalid *-shm files. (check-in: ff630b66 user: dan tags: readonly-wal-recovery)
20:02
Get read-only SHM file tests passing on Win32. (check-in: abef0535 user: mistachkin tags: readonly-wal-recovery)
18:53
Further corrections to read-only SHM file handling on Win32. (check-in: 43c31170 user: mistachkin tags: readonly-wal-recovery)
Changes
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Changes to src/os_win.c. 

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#ifndef SQLITE_WIN32_IOERR_RETRY_DELAY
# define SQLITE_WIN32_IOERR_RETRY_DELAY 25
#endif
static int winIoerrRetry = SQLITE_WIN32_IOERR_RETRY;
static int winIoerrRetryDelay = SQLITE_WIN32_IOERR_RETRY_DELAY;

/*
** The "winIsLockingError" macro is used to determine if a particular I/O
** error code is due to file locking.  It must accept the error code DWORD
** as its only argument and should return non-zero if the error code is due
** to file locking.
*/
#if !defined(winIsLockingError)
#define winIsLockingError(a) (((a)==NO_ERROR)                   || \
                              ((a)==ERROR_LOCK_VIOLATION)       || \
                              ((a)==ERROR_HANDLE_EOF)           || \
                              ((a)==ERROR_IO_PENDING))
#endif











/*
** The "winIoerrCanRetry1" macro is used to determine if a particular I/O
** error code obtained via GetLastError() is eligible to be retried.  It
** must accept the error code DWORD as its only argument and should return
** non-zero if the error code is transient in nature and the operation
** responsible for generating the original error might succeed upon being
** retried.  The argument to this macro should be a variable.
................................................................................
  pOverlapped = &overlapped;
#endif
  if( bReadOnly ||
      !osWriteFile(pFile->h, &notUsed1, 1, &notUsed2, pOverlapped) ){
    DWORD lastErrno = bReadOnly ? NO_ERROR : osGetLastError();
    if( !osReadFile(pFile->h, &notUsed1, 1, &notUsed2, pOverlapped) ){
      lastErrno = osGetLastError();
      if( winIsLockingError(lastErrno) ){
        if( pLockType ) *pLockType = WINSHM_WRLCK;


      }else{
        return SQLITE_IOERR_READ;
      }
    }else{
      if( winIsLockingError(lastErrno) ){
        if( pLockType ) *pLockType = WINSHM_RDLCK;
      }else{
        return SQLITE_IOERR_WRITE;
      }
    }
  }else{
    if( pLockType ) *pLockType = WINSHM_UNLCK;
................................................................................
    if( rc2!=SQLITE_OK ){
      rc2 = winOpen(pDbFd->pVfs,
                    pShmNode->zFilename,
                    (sqlite3_file*)&pShmNode->hFile,
                    SQLITE_OPEN_WAL|SQLITE_OPEN_READONLY,
                    0);
      if( rc2!=SQLITE_OK ){
        rc = winLogError(SQLITE_CANTOPEN_BKPT, osGetLastError(),
                         "winOpenShm", pShmNode->zFilename);
        goto shm_open_err;
      }
      pShmNode->isReadonly = 1;
    }

    rc = winLockSharedMemory(pShmNode);
    if( rc!=SQLITE_OK && rc!=SQLITE_READONLY_CANTINIT ) goto shm_open_err;








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#ifndef SQLITE_WIN32_IOERR_RETRY_DELAY
# define SQLITE_WIN32_IOERR_RETRY_DELAY 25
#endif
static int winIoerrRetry = SQLITE_WIN32_IOERR_RETRY;
static int winIoerrRetryDelay = SQLITE_WIN32_IOERR_RETRY_DELAY;

/*
** The "winIsLockConflict" macro is used to determine if a particular I/O
** error code is due to a file locking conflict.  It must accept the error
** code DWORD as its only argument.

*/
#if !defined(winIsLockConflict)
#define winIsLockConflict(a) (((a)==NO_ERROR)                   || \
                              ((a)==ERROR_LOCK_VIOLATION)       || \

                              ((a)==ERROR_IO_PENDING))
#endif

/*
** The "winIsLockMissing" macro is used to determine if a particular I/O
** error code is due to being unable to obtain a file lock because all or
** part of the range requested within the file is missing.  It must accept
** the error code DWORD as its only argument.
*/
#if !defined(winIsLockMissing)
#define winIsLockMissing(a) (((a)==ERROR_HANDLE_EOF))
#endif

/*
** The "winIoerrCanRetry1" macro is used to determine if a particular I/O
** error code obtained via GetLastError() is eligible to be retried.  It
** must accept the error code DWORD as its only argument and should return
** non-zero if the error code is transient in nature and the operation
** responsible for generating the original error might succeed upon being
** retried.  The argument to this macro should be a variable.
................................................................................
  pOverlapped = &overlapped;
#endif
  if( bReadOnly ||
      !osWriteFile(pFile->h, &notUsed1, 1, &notUsed2, pOverlapped) ){
    DWORD lastErrno = bReadOnly ? NO_ERROR : osGetLastError();
    if( !osReadFile(pFile->h, &notUsed1, 1, &notUsed2, pOverlapped) ){
      lastErrno = osGetLastError();
      if( winIsLockConflict(lastErrno) ){
        if( pLockType ) *pLockType = WINSHM_WRLCK;
      }else if( winIsLockMissing(lastErrno) ){
        if( pLockType ) *pLockType = WINSHM_UNLCK;
      }else{
        return SQLITE_IOERR_READ;
      }
    }else{
      if( winIsLockConflict(lastErrno) ){
        if( pLockType ) *pLockType = WINSHM_RDLCK;
      }else{
        return SQLITE_IOERR_WRITE;
      }
    }
  }else{
    if( pLockType ) *pLockType = WINSHM_UNLCK;
................................................................................
    if( rc2!=SQLITE_OK ){
      rc2 = winOpen(pDbFd->pVfs,
                    pShmNode->zFilename,
                    (sqlite3_file*)&pShmNode->hFile,
                    SQLITE_OPEN_WAL|SQLITE_OPEN_READONLY,
                    0);
      if( rc2!=SQLITE_OK ){
        rc = winLogError(rc2, osGetLastError(), "winOpenShm",
                         pShmNode->zFilename);
        goto shm_open_err;
      }
      pShmNode->isReadonly = 1;
    }

    rc = winLockSharedMemory(pShmNode);
    if( rc!=SQLITE_OK && rc!=SQLITE_READONLY_CANTINIT ) goto shm_open_err;

Changes to test/walro2.test. 

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        SELECT count(*) FROM t2;
    } 
  } {500}
  do_test 4.2.2 {
    file size test.db-wal
  } {461152}
  do_test 4.2.4 {


    forcecopy test.db test.db2
    forcecopy test.db-wal test.db2-wal
    forcecopy test.db-shm test.db2-shm

    code2 { sqlite3 db2 file:test.db2?readonly_shm=1 }
    sql2 {
      SELECT * FROM t1;








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        SELECT count(*) FROM t2;
    } 
  } {500}
  do_test 4.2.2 {
    file size test.db-wal
  } {461152}
  do_test 4.2.4 {
    file_control_persist_wal db 1; db close

    forcecopy test.db test.db2
    forcecopy test.db-wal test.db2-wal
    forcecopy test.db-shm test.db2-shm

    code2 { sqlite3 db2 file:test.db2?readonly_shm=1 }
    sql2 {
      SELECT * FROM t1;

Changes to test/walrofault.test. 

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  INSERT INTO t1 VALUES('world');
  INSERT INTO t1 VALUES('hello');
  PRAGMA cache_size = 10;
  BEGIN;
    WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<30 ) 
    INSERT INTO t1(b) SELECT randomblob(800) FROM s;
} {wal}

faultsim_save_and_close

do_faultsim_test 1 -faults oom* -prep {
  catch { db close }
  faultsim_restore
  sqlite3 db file:test.db?readonly_shm=1
} -body {








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  INSERT INTO t1 VALUES('world');
  INSERT INTO t1 VALUES('hello');
  PRAGMA cache_size = 10;
  BEGIN;
    WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<30 ) 
    INSERT INTO t1(b) SELECT randomblob(800) FROM s;
} {wal}
file_control_persist_wal db 1; db close
faultsim_save_and_close

do_faultsim_test 1 -faults oom* -prep {
  catch { db close }
  faultsim_restore
  sqlite3 db file:test.db?readonly_shm=1
} -body {

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