Add a file-control that will discover the name of the bottom-level VFS and

all the shims in between.

FossilOrigin-Name: cdbfb553af02d10767a905489d9dfc57fc6be54e

1 files changed, 6 insertions, 0 deletions

diff --git a/src/os_unix.c b/src/os_unix.c
index ecd5bf244..3cb28b058 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -206,6 +206,7 @@ struct UnixUnusedFd {
 typedef struct unixFile unixFile;
 struct unixFile {
   sqlite3_io_methods const *pMethod;  /* Always the first entry */
+  sqlite3_vfs *pVfs;                  /* The VFS that created this unixFile */
   unixInodeInfo *pInode;              /* Info about locks on this inode */
   int h;                              /* The file descriptor */
   unsigned char eFileLock;            /* The type of lock held on this fd */
@@ -3533,6 +3534,10 @@ static int unixFileControl(sqlite3_file *id, int op, void *pArg){
       }
       return SQLITE_OK;
     }
+    case SQLITE_FCNTL_VFSNAME: {
+      *(char**)pArg = sqlite3_mprintf("%s", pFile->pVfs->zName);
+      return SQLITE_OK;
+    }
 #ifndef NDEBUG
     /* The pager calls this method to signal that it has done
     ** a rollback and that the database is therefore unchanged and
@@ -4560,6 +4565,7 @@ static int fillInUnixFile(
 
   OSTRACE(("OPEN    %-3d %s\n", h, zFilename));
   pNew->h = h;
+  pNew->pVfs = pVfs;
   pNew->zPath = zFilename;
   if( memcmp(pVfs->zName,"unix-excl",10)==0 ){
     pNew->ctrlFlags = UNIXFILE_EXCL;