database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-12 13:01:09 +03:00
Code Activity

On unix, if the *-shm file cannot be opened for read/write access, open it

Browse Source 
read-only and proceed as if the readonly_shm=1 URI option were specified.

FossilOrigin-Name: ba718754fa5ab8596cb84b751051de98afa2706fe6c5df39ad6d925d790719ee
This commit is contained in:
dan
2017-11-07 15:43:52 +00:00
parent d24c5b1c98
commit f12ba66cf8
5 changed files with 28 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
src/os_unix.c
View File

@@ -4369,7 +4369,7 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
struct unixShmNode *pShmNode; /* The underlying mmapped file */
int rc = SQLITE_OK; /* Result code */
unixInodeInfo *pInode; /* The inode of fd */
char *zShmFilename; /* Name of the file used for SHM */
char *zShm; /* Name of the file used for SHM */
int nShmFilename; /* Size of the SHM filename in bytes */
/* Allocate space for the new unixShm object. */
@@ -4410,14 +4410,14 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
goto shm_open_err;
}
memset(pShmNode, 0, sizeof(*pShmNode)+nShmFilename);
zShmFilename = pShmNode->zFilename = (char*)&pShmNode[1];
zShm = pShmNode->zFilename = (char*)&pShmNode[1];
#ifdef SQLITE_SHM_DIRECTORY
sqlite3_snprintf(nShmFilename, zShmFilename,
sqlite3_snprintf(nShmFilename, zShm,
SQLITE_SHM_DIRECTORY "/sqlite-shm-%x-%x",
(u32)sStat.st_ino, (u32)sStat.st_dev);
#else
sqlite3_snprintf(nShmFilename, zShmFilename, "%s-shm", zBasePath);
sqlite3FileSuffix3(pDbFd->zPath, zShmFilename);
sqlite3_snprintf(nShmFilename, zShm, "%s-shm", zBasePath);
sqlite3FileSuffix3(pDbFd->zPath, zShm);
#endif
pShmNode->h = -1;
pDbFd->pInode->pShmNode = pShmNode;
@@ -4431,15 +4431,16 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
}
if( pInode->bProcessLock==0 ){
int openFlags = O_RDWR | O_CREAT;
if( sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
openFlags = O_RDONLY;
pShmNode->isReadonly = 1;
if( 0==sqlite3_uri_boolean(pDbFd->zPath, "readonly_shm", 0) ){
pShmNode->h = robust_open(zShm, O_RDWR|O_CREAT, (sStat.st_mode&0777));
}
pShmNode->h = robust_open(zShmFilename, openFlags, (sStat.st_mode&0777));
if( pShmNode->h<0 ){
rc = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zShmFilename);
goto shm_open_err;
pShmNode->h = robust_open(zShm, O_RDONLY, (sStat.st_mode&0777));
if( pShmNode->h<0 ){
rc = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zShm);
goto shm_open_err;
}
pShmNode->isReadonly = 1;
}
/* If this process is running as root, make sure that the SHM file