diff options
Diffstat (limited to 'src/os_unix.c')
| -rw-r--r-- | src/os_unix.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/os_unix.c b/src/os_unix.c index a97aba87f..00c0088f8 100644 --- a/src/os_unix.c +++ b/src/os_unix.c @@ -4591,13 +4591,16 @@ static int unixFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){ } /* -** If the second argument is non-NULL, then this function releases a -** reference obtained by an earlier call to unixFetch(). Or, if the second -** argument is NULL, then this function is being called to inform the VFS -** layer that, according to POSIX, any existing mapping may now be invalid -** and should be unmapped. +** If the third argument is non-NULL, then this function releases a +** reference obtained by an earlier call to unixFetch(). The second +** argument passed to this function must be the same as the corresponding +** argument that was passed to the unixFetch() invocation. +** +** Or, if the third argument is NULL, then this function is being called +** to inform the VFS layer that, according to POSIX, any existing mapping +** may now be invalid and should be unmapped. */ -static int unixUnfetch(sqlite3_file *fd, void *p){ +static int unixUnfetch(sqlite3_file *fd, i64 iOff, void *p){ unixFile *pFd = (unixFile *)fd; /* The underlying database file */ /* If p==0 (unmap the entire file) then there must be no outstanding @@ -4605,6 +4608,9 @@ static int unixUnfetch(sqlite3_file *fd, void *p){ ** then there must be at least one outstanding. */ assert( (p==0)==(pFd->nFetchOut==0) ); + /* If p!=0, it must match the iOff value. */ + assert( p==0 || p==&((u8 *)pFd->pMapRegion)[iOff] ); + if( p ){ pFd->nFetchOut--; }else{ |