Silence GCC compiler warnings about unused return value from fchown().

FossilOrigin-Name: b022547389a40930cf0d2a75f5eb293acc9fbfe0

manifest

@@ -1,5 +1,5 @@
-C Another\sattempt\sto\sfix\swarnings\sin\sthe\srandomFunc()\sfunction.
-D 2012-02-11T19:53:24.226
+C Silence\sGCC\scompiler\swarnings\sabout\sunused\sreturn\svalue\sfrom\sfchown().
+D 2012-02-11T21:21:17.335
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 3f79a373e57c3b92dabf76f40b065e719d31ac34
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -166,7 +166,7 @@ F src/os.c e1acdc09ff3ac2412945cca9766e2dcf4675f31c
 F src/os.h 59beba555b65a450bd1d804220532971d4299f60
 F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
 F src/os_os2.c 4a75888ba3dfc820ad5e8177025972d74d7f2440
-F src/os_unix.c f7e7b3e4f6922e3b07250a22c81da766ac2cc8fa
+F src/os_unix.c 3dd0399fe024df37af2980c99f1a3c1d3cc6a782
 F src/os_win.c 5ac061ae1326a71500cee578ed0fd9113b4f6a37
 F src/pager.c 2d892f7b901a8867a33bc21742086165a3a99af8
 F src/pager.h a435da8421dc7844b7f9c7f37b636c160c50208a
@@ -989,7 +989,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh 9f406d66e750e8ac031c63a9ef3248aaa347ef2a
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P 1254dffe4071656a783cd000b1dd40c975ac18cb
-R d9fa00aa327e93350ee48bb2f6ecc475
+P 768df4e11670ac704d96e3b601d009aaa2fd793a
+R 356443deb3c82ed63a280950a7c5c72e
 U drh
-Z 4e53a459dae4b9322244fc7645ecba60
+Z 590e6955e1a8261beb6491e7ffa39206

manifest.uuid

@@ -1 +1 @@
-768df4e11670ac704d96e3b601d009aaa2fd793a
+b022547389a40930cf0d2a75f5eb293acc9fbfe0

src/os_unix.c

@@ -211,7 +211,7 @@ struct 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 */
-  unsigned char ctrlFlags;            /* Behavioral bits.  UNIXFILE_* flags */
+  unsigned short int ctrlFlags;       /* Behavioral bits.  UNIXFILE_* flags */
   int lastErrno;                      /* The unix errno from last I/O error */
   void *lockingContext;               /* Locking style specific state */
   UnixUnusedFd *pUnused;              /* Pre-allocated UnixUnusedFd */
@@ -262,6 +262,7 @@ struct unixFile {
 #define UNIXFILE_DELETE      0x20     /* Delete on close */
 #define UNIXFILE_URI         0x40     /* Filename might have query parameters */
 #define UNIXFILE_NOLOCK      0x80     /* Do no file locking */
+#define UNIXFILE_CHOWN      0x100     /* File ownership was changed */
 
 /*
 ** Include code that is common to all os_*.c files
@@ -3908,9 +3909,13 @@ static int unixOpenSharedMemory(unixFile *pDbFd){
       /* If this process is running as root, make sure that the SHM file
       ** is owned by the same user that owns the original database.  Otherwise,
       ** the original owner will not be able to connect. If this process is
-      ** not root, the following fchown() will fail, but we don't care.
+      ** not root, the following fchown() will fail, but we don't care.  The
+      ** if(){..} and the UNIXFILE_CHOWN flag are purely to silence compiler
+      ** warnings.
       */
-      fchown(pShmNode->h, sStat.st_uid, sStat.st_gid);
+      if( fchown(pShmNode->h, sStat.st_uid, sStat.st_gid)==0 ){
+        pDbFd->ctrlFlags |= UNIXFILE_CHOWN;
+      }
   
       /* Check to see if another process is holding the dead-man switch.
       ** If not, truncate the file to zero length. 
@@ -5119,11 +5124,12 @@ static int unixOpen(
     /* If this process is running as root and if creating a new rollback
     ** journal or WAL file, set the ownership of the journal or WAL to be
     ** the same as the original database.  If we are not running as root,
-    ** then the fchown() call will fail, but that's ok - there is nothing
-    ** we can do about it so just ignore the error.
+    ** then the fchown() call will fail, but that's ok.  The "if(){}" and
+    ** the setting of the UNIXFILE_CHOWN flag are purely to silence compiler
+    ** warnings from gcc.
     */
     if( flags & (SQLITE_OPEN_WAL|SQLITE_OPEN_MAIN_JOURNAL) ){
-      fchown(fd, uid, gid);
+      if( fchown(fd, uid, gid)==0 ){ p->ctrlFlags |= UNIXFILE_CHOWN; }
     }
   }
   assert( fd>=0 );