diff options
Diffstat (limited to 'chromium/third_party/sqlite/src/src/os_unix.c')
-rw-r--r-- | chromium/third_party/sqlite/src/src/os_unix.c | 117 |
1 files changed, 85 insertions, 32 deletions
diff --git a/chromium/third_party/sqlite/src/src/os_unix.c b/chromium/third_party/sqlite/src/src/os_unix.c index 81a41263ba9..6e9ee3263b2 100644 --- a/chromium/third_party/sqlite/src/src/os_unix.c +++ b/chromium/third_party/sqlite/src/src/os_unix.c @@ -87,15 +87,16 @@ /* ** standard include files. */ -#include <sys/types.h> -#include <sys/stat.h> +#include <sys/types.h> /* amalgamator: keep */ +#include <sys/stat.h> /* amalgamator: keep */ #include <fcntl.h> #include <sys/ioctl.h> -#include <unistd.h> +#include <unistd.h> /* amalgamator: keep */ #include <time.h> -#include <sys/time.h> +#include <sys/time.h> /* amalgamator: keep */ #include <errno.h> -#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0 +#if (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) \ + && !defined(SQLITE_WASI) # include <sys/mman.h> #endif @@ -183,9 +184,46 @@ */ #define SQLITE_MAX_SYMLINKS 100 +/* +** Remove and stub certain info for WASI (WebAssembly System +** Interface) builds. +*/ +#ifdef SQLITE_WASI +# undef HAVE_FCHMOD +# undef HAVE_FCHOWN +# undef HAVE_MREMAP +# define HAVE_MREMAP 0 +# ifndef SQLITE_DEFAULT_UNIX_VFS +# define SQLITE_DEFAULT_UNIX_VFS "unix-dotfile" + /* ^^^ should SQLITE_DEFAULT_UNIX_VFS be "unix-none"? */ +# endif +# ifndef F_RDLCK +# define F_RDLCK 0 +# define F_WRLCK 1 +# define F_UNLCK 2 +# if __LONG_MAX == 0x7fffffffL +# define F_GETLK 12 +# define F_SETLK 13 +# define F_SETLKW 14 +# else +# define F_GETLK 5 +# define F_SETLK 6 +# define F_SETLKW 7 +# endif +# endif +#else /* !SQLITE_WASI */ +# ifndef HAVE_FCHMOD +# define HAVE_FCHMOD +# endif +#endif /* SQLITE_WASI */ + +#ifdef SQLITE_WASI +# define osGetpid(X) (pid_t)1 +#else /* Always cast the getpid() return type for compatibility with ** kernel modules in VxWorks. */ -#define osGetpid(X) (pid_t)getpid() +# define osGetpid(X) (pid_t)getpid() +#endif /* ** Only set the lastErrno if the error code is a real error and not @@ -457,7 +495,11 @@ static struct unix_syscall { #define osPwrite64 ((ssize_t(*)(int,const void*,size_t,off64_t))\ aSyscall[13].pCurrent) +#if defined(HAVE_FCHMOD) { "fchmod", (sqlite3_syscall_ptr)fchmod, 0 }, +#else + { "fchmod", (sqlite3_syscall_ptr)0, 0 }, +#endif #define osFchmod ((int(*)(int,mode_t))aSyscall[14].pCurrent) #if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE @@ -493,14 +535,16 @@ static struct unix_syscall { #endif #define osGeteuid ((uid_t(*)(void))aSyscall[21].pCurrent) -#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0 +#if (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) \ + && !defined(SQLITE_WASI) { "mmap", (sqlite3_syscall_ptr)mmap, 0 }, #else { "mmap", (sqlite3_syscall_ptr)0, 0 }, #endif #define osMmap ((void*(*)(void*,size_t,int,int,int,off_t))aSyscall[22].pCurrent) -#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0 +#if (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) \ + && !defined(SQLITE_WASI) { "munmap", (sqlite3_syscall_ptr)munmap, 0 }, #else { "munmap", (sqlite3_syscall_ptr)0, 0 }, @@ -686,6 +730,9 @@ static int robust_open(const char *z, int f, mode_t m){ break; } if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break; + if( (f & (O_EXCL|O_CREAT))==(O_EXCL|O_CREAT) ){ + (void)osUnlink(z); + } osClose(fd); sqlite3_log(SQLITE_WARNING, "attempt to open \"%s\" as file descriptor %d", z, fd); @@ -1648,7 +1695,7 @@ static int unixFileLock(unixFile *pFile, struct flock *pLock){ ** ** UNLOCKED -> SHARED ** SHARED -> RESERVED -** SHARED -> (PENDING) -> EXCLUSIVE +** SHARED -> EXCLUSIVE ** RESERVED -> (PENDING) -> EXCLUSIVE ** PENDING -> EXCLUSIVE ** @@ -1681,19 +1728,20 @@ static int unixLock(sqlite3_file *id, int eFileLock){ ** A RESERVED lock is implemented by grabbing a write-lock on the ** 'reserved byte'. ** - ** A process may only obtain a PENDING lock after it has obtained a - ** SHARED lock. A PENDING lock is implemented by obtaining a write-lock - ** on the 'pending byte'. This ensures that no new SHARED locks can be - ** obtained, but existing SHARED locks are allowed to persist. A process - ** does not have to obtain a RESERVED lock on the way to a PENDING lock. - ** This property is used by the algorithm for rolling back a journal file - ** after a crash. + ** An EXCLUSIVE lock may only be requested after either a SHARED or + ** RESERVED lock is held. An EXCLUSIVE lock is implemented by obtaining + ** a write-lock on the entire 'shared byte range'. Since all other locks + ** require a read-lock on one of the bytes within this range, this ensures + ** that no other locks are held on the database. ** - ** An EXCLUSIVE lock, obtained after a PENDING lock is held, is - ** implemented by obtaining a write-lock on the entire 'shared byte - ** range'. Since all other locks require a read-lock on one of the bytes - ** within this range, this ensures that no other locks are held on the - ** database. + ** If a process that holds a RESERVED lock requests an EXCLUSIVE, then + ** a PENDING lock is obtained first. A PENDING lock is implemented by + ** obtaining a write-lock on the 'pending byte'. This ensures that no new + ** SHARED locks can be obtained, but existing SHARED locks are allowed to + ** persist. If the call to this function fails to obtain the EXCLUSIVE + ** lock in this case, it holds the PENDING lock intead. The client may + ** then re-attempt the EXCLUSIVE lock later on, after existing SHARED + ** locks have cleared. */ int rc = SQLITE_OK; unixFile *pFile = (unixFile*)id; @@ -1764,7 +1812,7 @@ static int unixLock(sqlite3_file *id, int eFileLock){ lock.l_len = 1L; lock.l_whence = SEEK_SET; if( eFileLock==SHARED_LOCK - || (eFileLock==EXCLUSIVE_LOCK && pFile->eFileLock<PENDING_LOCK) + || (eFileLock==EXCLUSIVE_LOCK && pFile->eFileLock==RESERVED_LOCK) ){ lock.l_type = (eFileLock==SHARED_LOCK?F_RDLCK:F_WRLCK); lock.l_start = PENDING_BYTE; @@ -1775,6 +1823,9 @@ static int unixLock(sqlite3_file *id, int eFileLock){ storeLastErrno(pFile, tErrno); } goto end_lock; + }else if( eFileLock==EXCLUSIVE_LOCK ){ + pFile->eFileLock = PENDING_LOCK; + pInode->eFileLock = PENDING_LOCK; } } @@ -1862,13 +1913,9 @@ static int unixLock(sqlite3_file *id, int eFileLock){ } #endif - if( rc==SQLITE_OK ){ pFile->eFileLock = eFileLock; pInode->eFileLock = eFileLock; - }else if( eFileLock==EXCLUSIVE_LOCK ){ - pFile->eFileLock = PENDING_LOCK; - pInode->eFileLock = PENDING_LOCK; } end_lock: @@ -6459,12 +6506,10 @@ static void appendOnePathElement( if( zName[0]=='.' ){ if( nName==1 ) return; if( zName[1]=='.' && nName==2 ){ - if( pPath->nUsed<=1 ){ - pPath->rc = SQLITE_ERROR; - return; + if( pPath->nUsed>1 ){ + assert( pPath->zOut[0]=='/' ); + while( pPath->zOut[--pPath->nUsed]!='/' ){} } - assert( pPath->zOut[0]=='/' ); - while( pPath->zOut[--pPath->nUsed]!='/' ){} return; } } @@ -6676,7 +6721,7 @@ static int unixRandomness(sqlite3_vfs *NotUsed, int nBuf, char *zBuf){ ** than the argument. */ static int unixSleep(sqlite3_vfs *NotUsed, int microseconds){ -#if OS_VXWORKS +#if OS_VXWORKS || _POSIX_C_SOURCE >= 199309L struct timespec sp; sp.tv_sec = microseconds / 1000000; @@ -8058,8 +8103,16 @@ int sqlite3_os_init(void){ /* Register all VFSes defined in the aVfs[] array */ for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){ +#ifdef SQLITE_DEFAULT_UNIX_VFS + sqlite3_vfs_register(&aVfs[i], + 0==strcmp(aVfs[i].zName,SQLITE_DEFAULT_UNIX_VFS)); +#else sqlite3_vfs_register(&aVfs[i], i==0); +#endif } +#ifdef SQLITE_OS_KV_OPTIONAL + sqlite3KvvfsInit(); +#endif unixBigLock = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1); #ifndef SQLITE_OMIT_WAL |