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8588 lines (7961 loc) · 288 KB
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/*
** 2004 May 22
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This file contains the VFS implementation for unix-like operating systems
** include Linux, MacOSX, *BSD, QNX, VxWorks, AIX, HPUX, and others.
**
** There are actually several different VFS implementations in this file.
** The differences are in the way that file locking is done. The default
** implementation uses Posix Advisory Locks. Alternative implementations
** use flock(), dot-files, various proprietary locking schemas, or simply
** skip locking all together.
**
** This source file is organized into divisions where the logic for various
** subfunctions is contained within the appropriate division. PLEASE
** KEEP THE STRUCTURE OF THIS FILE INTACT. New code should be placed
** in the correct division and should be clearly labelled.
**
** The layout of divisions is as follows:
**
** * General-purpose declarations and utility functions.
** * Unique file ID logic used by VxWorks.
** * Various locking primitive implementations (all except proxy locking):
** + for Posix Advisory Locks
** + for no-op locks
** + for dot-file locks
** + for flock() locking
** + for named semaphore locks (VxWorks only)
** + for AFP filesystem locks (MacOSX only)
** * sqlite3_file methods not associated with locking.
** * Definitions of sqlite3_io_methods objects for all locking
** methods plus "finder" functions for each locking method.
** * sqlite3_vfs method implementations.
** * Locking primitives for the proxy uber-locking-method. (MacOSX only)
** * Definitions of sqlite3_vfs objects for all locking methods
** plus implementations of sqlite3_os_init() and sqlite3_os_end().
*/
#include "sqliteInt.h"
#if SQLITE_OS_UNIX /* This file is used on unix only */
/*
** There are various methods for file locking used for concurrency
** control:
**
** 1. POSIX locking (the default),
** 2. No locking,
** 3. Dot-file locking,
** 4. flock() locking,
** 5. AFP locking (OSX only),
** 6. Named POSIX semaphores (VXWorks only),
** 7. proxy locking. (OSX only)
**
** Styles 4, 5, and 7 are only available of SQLITE_ENABLE_LOCKING_STYLE
** is defined to 1. The SQLITE_ENABLE_LOCKING_STYLE also enables automatic
** selection of the appropriate locking style based on the filesystem
** where the database is located.
*/
#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
# if defined(__APPLE__)
# define SQLITE_ENABLE_LOCKING_STYLE 1
# else
# define SQLITE_ENABLE_LOCKING_STYLE 0
# endif
#endif
/* Use pread() and pwrite() if they are available */
#if defined(__APPLE__) || defined(__linux__)
# define HAVE_PREAD 1
# define HAVE_PWRITE 1
#endif
#if defined(HAVE_PREAD64) && defined(HAVE_PWRITE64)
# undef USE_PREAD
# define USE_PREAD64 1
#elif defined(HAVE_PREAD) && defined(HAVE_PWRITE)
# undef USE_PREAD64
# define USE_PREAD 1
#endif
/*
** standard include files.
*/
#include <sys/types.h> /* amalgamator: keep */
#include <sys/stat.h> /* amalgamator: keep */
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h> /* amalgamator: keep */
#include <time.h>
#include <sys/time.h> /* amalgamator: keep */
#include <errno.h>
#if (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0) \
&& !defined(SQLITE_WASI)
# include <sys/mman.h>
#endif
#if SQLITE_ENABLE_LOCKING_STYLE
# include <sys/ioctl.h>
# include <sys/file.h>
# include <sys/param.h>
#endif /* SQLITE_ENABLE_LOCKING_STYLE */
/*
** Try to determine if gethostuuid() is available based on standard
** macros. This might sometimes compute the wrong value for some
** obscure platforms. For those cases, simply compile with one of
** the following:
**
** -DHAVE_GETHOSTUUID=0
** -DHAVE_GETHOSTUUID=1
**
** None if this matters except when building on Apple products with
** -DSQLITE_ENABLE_LOCKING_STYLE.
*/
#ifndef HAVE_GETHOSTUUID
# define HAVE_GETHOSTUUID 0
# if defined(__APPLE__) && ((__MAC_OS_X_VERSION_MIN_REQUIRED > 1050) || \
(__IPHONE_OS_VERSION_MIN_REQUIRED > 2000))
# if (!defined(TARGET_OS_EMBEDDED) || (TARGET_OS_EMBEDDED==0)) \
&& (!defined(TARGET_IPHONE_SIMULATOR) || (TARGET_IPHONE_SIMULATOR==0))\
&& (!defined(TARGET_OS_MACCATALYST) || (TARGET_OS_MACCATALYST==0))
# undef HAVE_GETHOSTUUID
# define HAVE_GETHOSTUUID 1
# else
# warning "gethostuuid() is disabled."
# endif
# endif
#endif
#if OS_VXWORKS
# include <sys/ioctl.h>
# include <semaphore.h>
# include <limits.h>
#endif /* OS_VXWORKS */
#if defined(__APPLE__) || SQLITE_ENABLE_LOCKING_STYLE
# include <sys/mount.h>
#endif
#ifdef HAVE_UTIME
# include <utime.h>
#endif
/*
** Allowed values of unixFile.fsFlags
*/
#define SQLITE_FSFLAGS_IS_MSDOS 0x1
/*
** If we are to be thread-safe, include the pthreads header.
*/
#if SQLITE_THREADSAFE
# include <pthread.h>
#endif
/*
** Default permissions when creating a new file
*/
#ifndef SQLITE_DEFAULT_FILE_PERMISSIONS
# define SQLITE_DEFAULT_FILE_PERMISSIONS 0644
#endif
/*
** Default permissions when creating auto proxy dir
*/
#ifndef SQLITE_DEFAULT_PROXYDIR_PERMISSIONS
# define SQLITE_DEFAULT_PROXYDIR_PERMISSIONS 0755
#endif
/*
** Maximum supported path-length.
*/
#define MAX_PATHNAME 512
/*
** Maximum supported symbolic links
*/
#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 1
# 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()
#endif
/*
** Only set the lastErrno if the error code is a real error and not
** a normal expected return code of SQLITE_BUSY or SQLITE_OK
*/
#define IS_LOCK_ERROR(x) ((x != SQLITE_OK) && (x != SQLITE_BUSY))
/* Forward references */
typedef struct unixShm unixShm; /* Connection shared memory */
typedef struct unixShmNode unixShmNode; /* Shared memory instance */
typedef struct unixInodeInfo unixInodeInfo; /* An i-node */
typedef struct UnixUnusedFd UnixUnusedFd; /* An unused file descriptor */
/*
** Sometimes, after a file handle is closed by SQLite, the file descriptor
** cannot be closed immediately. In these cases, instances of the following
** structure are used to store the file descriptor while waiting for an
** opportunity to either close or reuse it.
*/
struct UnixUnusedFd {
int fd; /* File descriptor to close */
int flags; /* Flags this file descriptor was opened with */
UnixUnusedFd *pNext; /* Next unused file descriptor on same file */
};
/*
** The unixFile structure is subclass of sqlite3_file specific to the unix
** VFS implementations.
*/
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 */
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 *pPreallocatedUnused; /* Pre-allocated UnixUnusedFd */
const char *zPath; /* Name of the file */
unixShm *pShm; /* Shared memory segment information */
int szChunk; /* Configured by FCNTL_CHUNK_SIZE */
#if SQLITE_MAX_MMAP_SIZE>0
int nFetchOut; /* Number of outstanding xFetch refs */
sqlite3_int64 mmapSize; /* Usable size of mapping at pMapRegion */
sqlite3_int64 mmapSizeActual; /* Actual size of mapping at pMapRegion */
sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */
void *pMapRegion; /* Memory mapped region */
#endif
int sectorSize; /* Device sector size */
int deviceCharacteristics; /* Precomputed device characteristics */
#if SQLITE_ENABLE_LOCKING_STYLE
int openFlags; /* The flags specified at open() */
#endif
#if SQLITE_ENABLE_LOCKING_STYLE || defined(__APPLE__)
unsigned fsFlags; /* cached details from statfs() */
#endif
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
unsigned iBusyTimeout; /* Wait this many millisec on locks */
int bBlockOnConnect; /* True to block for SHARED locks */
#endif
#if OS_VXWORKS
struct vxworksFileId *pId; /* Unique file ID */
#endif
#ifdef SQLITE_DEBUG
/* The next group of variables are used to track whether or not the
** transaction counter in bytes 24-27 of database files are updated
** whenever any part of the database changes. An assertion fault will
** occur if a file is updated without also updating the transaction
** counter. This test is made to avoid new problems similar to the
** one described by ticket #3584.
*/
unsigned char transCntrChng; /* True if the transaction counter changed */
unsigned char dbUpdate; /* True if any part of database file changed */
unsigned char inNormalWrite; /* True if in a normal write operation */
#endif
#ifdef SQLITE_TEST
/* In test mode, increase the size of this structure a bit so that
** it is larger than the struct CrashFile defined in test6.c.
*/
char aPadding[32];
#endif
};
/* This variable holds the process id (pid) from when the xRandomness()
** method was called. If xOpen() is called from a different process id,
** indicating that a fork() has occurred, the PRNG will be reset.
*/
static pid_t randomnessPid = 0;
/*
** Allowed values for the unixFile.ctrlFlags bitmask:
*/
#define UNIXFILE_EXCL 0x01 /* Connections from one process only */
#define UNIXFILE_RDONLY 0x02 /* Connection is read only */
#define UNIXFILE_PERSIST_WAL 0x04 /* Persistent WAL mode */
#if !defined(SQLITE_DISABLE_DIRSYNC) && !defined(_AIX)
# define UNIXFILE_DIRSYNC 0x08 /* Directory sync needed */
#else
# define UNIXFILE_DIRSYNC 0x00
#endif
#define UNIXFILE_PSOW 0x10 /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */
#define UNIXFILE_DELETE 0x20 /* Delete on close */
#define UNIXFILE_URI 0x40 /* Filename might have query parameters */
#define UNIXFILE_NOLOCK 0x80 /* Do no file locking */
/*
** Include code that is common to all os_*.c files
*/
#include "os_common.h"
/*
** Define various macros that are missing from some systems.
*/
#ifndef O_LARGEFILE
# define O_LARGEFILE 0
#endif
#ifdef SQLITE_DISABLE_LFS
# undef O_LARGEFILE
# define O_LARGEFILE 0
#endif
#ifndef O_NOFOLLOW
# define O_NOFOLLOW 0
#endif
#ifndef O_BINARY
# define O_BINARY 0
#endif
/*
** The threadid macro resolves to the thread-id or to 0. Used for
** testing and debugging only.
*/
#if SQLITE_THREADSAFE
#define threadid pthread_self()
#else
#define threadid 0
#endif
/*
** HAVE_MREMAP defaults to true on Linux and false everywhere else.
*/
#if !defined(HAVE_MREMAP)
# if defined(__linux__) && defined(_GNU_SOURCE)
# define HAVE_MREMAP 1
# else
# define HAVE_MREMAP 0
# endif
#endif
/*
** Explicitly call the 64-bit version of lseek() on Android. Otherwise, lseek()
** is the 32-bit version, even if _FILE_OFFSET_BITS=64 is defined.
*/
#ifdef __ANDROID__
# define lseek lseek64
#endif
#ifdef __linux__
/*
** Linux-specific IOCTL magic numbers used for controlling F2FS
*/
#define F2FS_IOCTL_MAGIC 0xf5
#define F2FS_IOC_START_ATOMIC_WRITE _IO(F2FS_IOCTL_MAGIC, 1)
#define F2FS_IOC_COMMIT_ATOMIC_WRITE _IO(F2FS_IOCTL_MAGIC, 2)
#define F2FS_IOC_START_VOLATILE_WRITE _IO(F2FS_IOCTL_MAGIC, 3)
#define F2FS_IOC_ABORT_VOLATILE_WRITE _IO(F2FS_IOCTL_MAGIC, 5)
#define F2FS_IOC_GET_FEATURES _IOR(F2FS_IOCTL_MAGIC, 12, u32)
#define F2FS_FEATURE_ATOMIC_WRITE 0x0004
#endif /* __linux__ */
/*
** Different Unix systems declare open() in different ways. Same use
** open(const char*,int,mode_t). Others use open(const char*,int,...).
** The difference is important when using a pointer to the function.
**
** The safest way to deal with the problem is to always use this wrapper
** which always has the same well-defined interface.
*/
static int posixOpen(const char *zFile, int flags, int mode){
return open(zFile, flags, mode);
}
/* Forward reference */
static int openDirectory(const char*, int*);
static int unixGetpagesize(void);
/*
** Many system calls are accessed through pointer-to-functions so that
** they may be overridden at runtime to facilitate fault injection during
** testing and sandboxing. The following array holds the names and pointers
** to all overrideable system calls.
*/
static struct unix_syscall {
const char *zName; /* Name of the system call */
sqlite3_syscall_ptr pCurrent; /* Current value of the system call */
sqlite3_syscall_ptr pDefault; /* Default value */
} aSyscall[] = {
{ "open", (sqlite3_syscall_ptr)posixOpen, 0 },
#define osOpen ((int(*)(const char*,int,int))aSyscall[0].pCurrent)
{ "close", (sqlite3_syscall_ptr)close, 0 },
#define osClose ((int(*)(int))aSyscall[1].pCurrent)
{ "access", (sqlite3_syscall_ptr)access, 0 },
#define osAccess ((int(*)(const char*,int))aSyscall[2].pCurrent)
{ "getcwd", (sqlite3_syscall_ptr)getcwd, 0 },
#define osGetcwd ((char*(*)(char*,size_t))aSyscall[3].pCurrent)
{ "stat", (sqlite3_syscall_ptr)stat, 0 },
#define osStat ((int(*)(const char*,struct stat*))aSyscall[4].pCurrent)
/*
** The DJGPP compiler environment looks mostly like Unix, but it
** lacks the fcntl() system call. So redefine fcntl() to be something
** that always succeeds. This means that locking does not occur under
** DJGPP. But it is DOS - what did you expect?
*/
#ifdef __DJGPP__
{ "fstat", 0, 0 },
#define osFstat(a,b,c) 0
#else
{ "fstat", (sqlite3_syscall_ptr)fstat, 0 },
#define osFstat ((int(*)(int,struct stat*))aSyscall[5].pCurrent)
#endif
{ "ftruncate", (sqlite3_syscall_ptr)ftruncate, 0 },
#define osFtruncate ((int(*)(int,off_t))aSyscall[6].pCurrent)
{ "fcntl", (sqlite3_syscall_ptr)fcntl, 0 },
#define osFcntl ((int(*)(int,int,...))aSyscall[7].pCurrent)
{ "read", (sqlite3_syscall_ptr)read, 0 },
#define osRead ((ssize_t(*)(int,void*,size_t))aSyscall[8].pCurrent)
#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
{ "pread", (sqlite3_syscall_ptr)pread, 0 },
#else
{ "pread", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osPread ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[9].pCurrent)
#if defined(USE_PREAD64)
{ "pread64", (sqlite3_syscall_ptr)pread64, 0 },
#else
{ "pread64", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osPread64 ((ssize_t(*)(int,void*,size_t,off64_t))aSyscall[10].pCurrent)
{ "write", (sqlite3_syscall_ptr)write, 0 },
#define osWrite ((ssize_t(*)(int,const void*,size_t))aSyscall[11].pCurrent)
#if defined(USE_PREAD) || SQLITE_ENABLE_LOCKING_STYLE
{ "pwrite", (sqlite3_syscall_ptr)pwrite, 0 },
#else
{ "pwrite", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osPwrite ((ssize_t(*)(int,const void*,size_t,off_t))\
aSyscall[12].pCurrent)
#if defined(USE_PREAD64)
{ "pwrite64", (sqlite3_syscall_ptr)pwrite64, 0 },
#else
{ "pwrite64", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osPwrite64 ((ssize_t(*)(int,const void*,size_t,off64_t))\
aSyscall[13].pCurrent)
#if defined(HAVE_FCHMOD)
{ "fchmod", (sqlite3_syscall_ptr)fchmod, 0 },
#define osFchmod ((int(*)(int,mode_t))aSyscall[14].pCurrent)
#else
{ "fchmod", (sqlite3_syscall_ptr)0, 0 },
#define osFchmod(FID,MODE) 0
#endif
#if defined(HAVE_POSIX_FALLOCATE) && HAVE_POSIX_FALLOCATE
{ "fallocate", (sqlite3_syscall_ptr)posix_fallocate, 0 },
#else
{ "fallocate", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osFallocate ((int(*)(int,off_t,off_t))aSyscall[15].pCurrent)
{ "unlink", (sqlite3_syscall_ptr)unlink, 0 },
#define osUnlink ((int(*)(const char*))aSyscall[16].pCurrent)
{ "openDirectory", (sqlite3_syscall_ptr)openDirectory, 0 },
#define osOpenDirectory ((int(*)(const char*,int*))aSyscall[17].pCurrent)
{ "mkdir", (sqlite3_syscall_ptr)mkdir, 0 },
#define osMkdir ((int(*)(const char*,mode_t))aSyscall[18].pCurrent)
{ "rmdir", (sqlite3_syscall_ptr)rmdir, 0 },
#define osRmdir ((int(*)(const char*))aSyscall[19].pCurrent)
#if defined(HAVE_FCHOWN)
{ "fchown", (sqlite3_syscall_ptr)fchown, 0 },
#else
{ "fchown", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osFchown ((int(*)(int,uid_t,gid_t))aSyscall[20].pCurrent)
#if defined(HAVE_FCHOWN)
{ "geteuid", (sqlite3_syscall_ptr)geteuid, 0 },
#else
{ "geteuid", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osGeteuid ((uid_t(*)(void))aSyscall[21].pCurrent)
#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) \
&& !defined(SQLITE_WASI)
{ "munmap", (sqlite3_syscall_ptr)munmap, 0 },
#else
{ "munmap", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osMunmap ((int(*)(void*,size_t))aSyscall[23].pCurrent)
#if HAVE_MREMAP && (!defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0)
{ "mremap", (sqlite3_syscall_ptr)mremap, 0 },
#else
{ "mremap", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osMremap ((void*(*)(void*,size_t,size_t,int,...))aSyscall[24].pCurrent)
#if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0
{ "getpagesize", (sqlite3_syscall_ptr)unixGetpagesize, 0 },
#else
{ "getpagesize", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osGetpagesize ((int(*)(void))aSyscall[25].pCurrent)
#if defined(HAVE_READLINK)
{ "readlink", (sqlite3_syscall_ptr)readlink, 0 },
#else
{ "readlink", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osReadlink ((ssize_t(*)(const char*,char*,size_t))aSyscall[26].pCurrent)
#if defined(HAVE_LSTAT)
{ "lstat", (sqlite3_syscall_ptr)lstat, 0 },
#else
{ "lstat", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osLstat ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)
#if defined(__linux__) && defined(SQLITE_ENABLE_BATCH_ATOMIC_WRITE)
# ifdef __ANDROID__
{ "ioctl", (sqlite3_syscall_ptr)(int(*)(int, int, ...))ioctl, 0 },
#define osIoctl ((int(*)(int,int,...))aSyscall[28].pCurrent)
# else
{ "ioctl", (sqlite3_syscall_ptr)ioctl, 0 },
#define osIoctl ((int(*)(int,unsigned long,...))aSyscall[28].pCurrent)
# endif
#else
{ "ioctl", (sqlite3_syscall_ptr)0, 0 },
#endif
}; /* End of the overrideable system calls */
#if defined(SQLITE_DEBUG) || defined(SQLITE_ENABLE_FILESTAT)
/*
** Extract Posix Advisory Locking information about file description fd
** from the /proc/PID/fdinfo/FD pseudo-file. Fill the string buffer a[16]
** with characters to indicate which SQLite-relevant locks are held.
** a[16] will be a 15-character zero-terminated string with the following
** schema:
**
** AAA/B.DDD.DDDDD
**
** Each of character A-D will be "w" or "r" or "-" to indicate either a
** write-lock, a read-lock, or no-lock, respectively. The "." and "/"
** characters are delimiters intended to make the string more easily
** readable by humans. Here are the meaning of the specific letters:
**
** AAA -> The main database locks. PENDING_BYTE, RESERVED_BYTE,
** and SHARED_FIRST, respectively.
**
** B -> The deadman switch lock. Offset 128 of the -shm file.
**
** CCC -> WAL locks: WRITE, CKPT, RECOVER
**
** DDDDD -> WAL read-locks 0 through 5
**
** Note that elements before the "/" apply to the main database file and
** elements after the "/" apply to the -shm file in WAL mode.
**
** Here is another way of thinking about the meaning of the result string:
**
** AAA/B.CCC.DDDDD
** ||| | ||| \___/
** PENDING--'|| | ||| `----- READ 0-5
** RESERVED--'| | ||`---- RECOVER
** SHARED ----' | |`----- CKPT
** DMS ------' `------ WRITE
**
** Return SQLITE_OK on success and SQLITE_ERROR_UNABLE if the /proc
** pseudo-filesystem is unavailable.
*/
static int unixPosixAdvisoryLocks(
int fd, /* The file descriptor to analyze */
char a[16] /* Write a text description of PALs here */
){
int in;
ssize_t n;
char *p, *pNext, *x;
char z[2000];
/* 1 */
/* 012 4 678 01234 */
memcpy(a, "---/-.---.-----", 16);
sqlite3_snprintf(sizeof(z), z, "/proc/%d/fdinfo/%d", getpid(), fd);
in = osOpen(z, O_RDONLY, 0);
if( in<0 ){
return SQLITE_ERROR_UNABLE;
}
n = osRead(in, z, sizeof(z)-1);
osClose(in);
if( n<=0 ) return SQLITE_ERROR_UNABLE;
z[n] = 0;
/* We are looking for lines that begin with "lock:\t". Examples:
**
** lock: 1: POSIX ADVISORY READ 494716 08:02:5277597 1073741826 1073742335
** lock: 1: POSIX ADVISORY WRITE 494716 08:02:5282282 120 120
** lock: 2: POSIX ADVISORY READ 494716 08:02:5282282 123 123
** lock: 3: POSIX ADVISORY READ 494716 08:02:5282282 128 128
*/
pNext = strstr(z, "lock:\t");
while( pNext ){
char cType = 0;
sqlite3_int64 iFirst, iLast;
p = pNext+6;
pNext = strstr(p, "lock:\t");
if( pNext ) pNext[-1] = 0;
if( (x = strstr(p, " READ "))!=0 ){
cType = 'r';
x += 6;
}else if( (x = strstr(p, " WRITE "))!=0 ){
cType = 'w';
x += 7;
}else{
continue;
}
x = strrchr(x, ' ');
if( x==0 ) continue;
iLast = strtoll(x+1, 0, 10);
*x = 0;
x = strrchr(p, ' ');
if( x==0 ) continue;
iFirst = strtoll(x+1, 0, 10);
if( iLast>=PENDING_BYTE ){
if( iFirst<=PENDING_BYTE && iLast>=PENDING_BYTE ) a[0] = cType;
if( iFirst<=PENDING_BYTE+1 && iLast>=PENDING_BYTE+1 ) a[1] = cType;
if( iFirst<=PENDING_BYTE+2 && iLast>=PENDING_BYTE+510 ) a[2] = cType;
}else if( iLast<=128 ){
if( iFirst<=128 && iLast>=128 ) a[4] = cType;
if( iFirst<=120 && iLast>=120 ) a[6] = cType;
if( iFirst<=121 && iLast>=121 ) a[7] = cType;
if( iFirst<=122 && iLast>=122 ) a[8] = cType;
if( iFirst<=123 && iLast>=123 ) a[10] = cType;
if( iFirst<=124 && iLast>=124 ) a[11] = cType;
if( iFirst<=125 && iLast>=125 ) a[12] = cType;
if( iFirst<=126 && iLast>=126 ) a[13] = cType;
if( iFirst<=127 && iLast>=127 ) a[14] = cType;
}
}
return SQLITE_OK;
}
#else
# define unixPosixAdvisoryLocks(A,B) SQLITE_ERROR_UNABLE
#endif /* SQLITE_DEBUG || SQLITE_ENABLE_FILESTAT */
/*
** On some systems, calls to fchown() will trigger a message in a security
** log if they come from non-root processes. So avoid calling fchown() if
** we are not running as root.
*/
static int robustFchown(int fd, uid_t uid, gid_t gid){
#if defined(HAVE_FCHOWN)
return osGeteuid() ? 0 : osFchown(fd,uid,gid);
#else
return 0;
#endif
}
/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "unix" VFSes. Return SQLITE_OK upon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
*/
static int unixSetSystemCall(
sqlite3_vfs *pNotUsed, /* The VFS pointer. Not used */
const char *zName, /* Name of system call to override */
sqlite3_syscall_ptr pNewFunc /* Pointer to new system call value */
){
unsigned int i;
int rc = SQLITE_NOTFOUND;
UNUSED_PARAMETER(pNotUsed);
if( zName==0 ){
/* If no zName is given, restore all system calls to their default
** settings and return NULL
*/
rc = SQLITE_OK;
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( aSyscall[i].pDefault ){
aSyscall[i].pCurrent = aSyscall[i].pDefault;
}
}
}else{
/* If zName is specified, operate on only the one system call
** specified.
*/
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( strcmp(zName, aSyscall[i].zName)==0 ){
if( aSyscall[i].pDefault==0 ){
aSyscall[i].pDefault = aSyscall[i].pCurrent;
}
rc = SQLITE_OK;
if( pNewFunc==0 ) pNewFunc = aSyscall[i].pDefault;
aSyscall[i].pCurrent = pNewFunc;
break;
}
}
}
return rc;
}
/*
** Return the value of a system call. Return NULL if zName is not a
** recognized system call name. NULL is also returned if the system call
** is currently undefined.
*/
static sqlite3_syscall_ptr unixGetSystemCall(
sqlite3_vfs *pNotUsed,
const char *zName
){
unsigned int i;
UNUSED_PARAMETER(pNotUsed);
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( strcmp(zName, aSyscall[i].zName)==0 ) return aSyscall[i].pCurrent;
}
return 0;
}
/*
** Return the name of the first system call after zName. If zName==NULL
** then return the name of the first system call. Return NULL if zName
** is the last system call or if zName is not the name of a valid
** system call.
*/
static const char *unixNextSystemCall(sqlite3_vfs *p, const char *zName){
int i = -1;
UNUSED_PARAMETER(p);
if( zName ){
for(i=0; i<ArraySize(aSyscall)-1; i++){
if( strcmp(zName, aSyscall[i].zName)==0 ) break;
}
}
for(i++; i<ArraySize(aSyscall); i++){
if( aSyscall[i].pCurrent!=0 ) return aSyscall[i].zName;
}
return 0;
}
/*
** Do not accept any file descriptor less than this value, in order to avoid
** opening database file using file descriptors that are commonly used for
** standard input, output, and error.
*/
#ifndef SQLITE_MINIMUM_FILE_DESCRIPTOR
# define SQLITE_MINIMUM_FILE_DESCRIPTOR 3
#endif
/*
** Invoke open(). Do so multiple times, until it either succeeds or
** fails for some reason other than EINTR.
**
** If the file creation mode "m" is 0 then set it to the default for
** SQLite. The default is SQLITE_DEFAULT_FILE_PERMISSIONS (normally
** 0644) as modified by the system umask. If m is not 0, then
** make the file creation mode be exactly m ignoring the umask.
**
** The m parameter will be non-zero only when creating -wal, -journal,
** and -shm files. We want those files to have *exactly* the same
** permissions as their original database, unadulterated by the umask.
** In that way, if a database file is -rw-rw-rw or -rw-rw-r-, and a
** transaction crashes and leaves behind hot journals, then any
** process that is able to write to the database will also be able to
** recover the hot journals.
*/
static int robust_open(const char *z, int f, mode_t m){
int fd;
mode_t m2 = m ? m : SQLITE_DEFAULT_FILE_PERMISSIONS;
while(1){
#if defined(O_CLOEXEC)
fd = osOpen(z,f|O_CLOEXEC,m2);
#else
fd = osOpen(z,f,m2);
#endif
if( fd<0 ){
if( errno==EINTR ) continue;
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);
fd = -1;
if( osOpen("/dev/null", O_RDONLY, m)<0 ) break;
}
if( fd>=0 ){
if( m!=0 ){
struct stat statbuf;
if( osFstat(fd, &statbuf)==0
&& statbuf.st_size==0
&& (statbuf.st_mode&0777)!=m
){
osFchmod(fd, m);
}
}
#if defined(FD_CLOEXEC) && (!defined(O_CLOEXEC) || O_CLOEXEC==0)
osFcntl(fd, F_SETFD, osFcntl(fd, F_GETFD, 0) | FD_CLOEXEC);
#endif
}
return fd;
}
/*
** Helper functions to obtain and relinquish the global mutex. The
** global mutex is used to protect the unixInodeInfo objects used by
** this file, all of which may be shared by multiple threads.
**
** Function unixMutexHeld() is used to assert() that the global mutex
** is held when required. This function is only used as part of assert()
** statements. e.g.
**
** unixEnterMutex()
** assert( unixMutexHeld() );
** unixEnterLeave()
**
** To prevent deadlock, the global unixBigLock must must be acquired
** before the unixInodeInfo.pLockMutex mutex, if both are held. It is
** OK to get the pLockMutex without holding unixBigLock first, but if
** that happens, the unixBigLock mutex must not be acquired until after
** pLockMutex is released.
**
** OK: enter(unixBigLock), enter(pLockInfo)
** OK: enter(unixBigLock)
** OK: enter(pLockInfo)
** ERROR: enter(pLockInfo), enter(unixBigLock)
*/
static sqlite3_mutex *unixBigLock = 0;
static void unixEnterMutex(void){
assert( sqlite3_mutex_notheld(unixBigLock) ); /* Not a recursive mutex */
sqlite3_mutex_enter(unixBigLock);
}
static void unixLeaveMutex(void){
assert( sqlite3_mutex_held(unixBigLock) );
sqlite3_mutex_leave(unixBigLock);
}
#ifdef SQLITE_DEBUG
static int unixMutexHeld(void) {
return sqlite3_mutex_held(unixBigLock);
}
#endif
#ifdef SQLITE_HAVE_OS_TRACE
/*
** Helper function for printing out trace information from debugging
** binaries. This returns the string representation of the supplied
** integer lock-type.
*/
static const char *azFileLock(int eFileLock){
switch( eFileLock ){
case NO_LOCK: return "NONE";
case SHARED_LOCK: return "SHARED";
case RESERVED_LOCK: return "RESERVED";
case PENDING_LOCK: return "PENDING";
case EXCLUSIVE_LOCK: return "EXCLUSIVE";
}
return "ERROR";
}
#endif
#ifdef SQLITE_LOCK_TRACE
/*
** Print out information about all locking operations.
**
** This routine is used for troubleshooting locks on multithreaded
** platforms. Enable by compiling with the -DSQLITE_LOCK_TRACE
** command-line option on the compiler. This code is normally
** turned off.
*/
static int lockTrace(int fd, int op, struct flock *p){
char *zOpName, *zType;
int s;
int savedErrno;
if( op==F_GETLK ){
zOpName = "GETLK";
}else if( op==F_SETLK ){
zOpName = "SETLK";
}else{
s = osFcntl(fd, op, p);
sqlite3DebugPrintf("fcntl unknown %d %d %d\n", fd, op, s);
return s;
}
if( p->l_type==F_RDLCK ){
zType = "RDLCK";
}else if( p->l_type==F_WRLCK ){
zType = "WRLCK";
}else if( p->l_type==F_UNLCK ){
zType = "UNLCK";
}else{
assert( 0 );
}
assert( p->l_whence==SEEK_SET );
s = osFcntl(fd, op, p);
savedErrno = errno;
sqlite3DebugPrintf("fcntl %d %d %s %s %d %d %d %d\n",
threadid, fd, zOpName, zType, (int)p->l_start, (int)p->l_len,
(int)p->l_pid, s);
if( s==(-1) && op==F_SETLK && (p->l_type==F_RDLCK || p->l_type==F_WRLCK) ){
struct flock l2;
l2 = *p;
osFcntl(fd, F_GETLK, &l2);
if( l2.l_type==F_RDLCK ){
zType = "RDLCK";
}else if( l2.l_type==F_WRLCK ){
zType = "WRLCK";
}else if( l2.l_type==F_UNLCK ){
zType = "UNLCK";
}else{
assert( 0 );
}
sqlite3DebugPrintf("fcntl-failure-reason: %s %d %d %d\n",
zType, (int)l2.l_start, (int)l2.l_len, (int)l2.l_pid);
}
errno = savedErrno;
return s;
}
#undef osFcntl
#define osFcntl lockTrace
#endif /* SQLITE_LOCK_TRACE */
/*
** Retry ftruncate() calls that fail due to EINTR
**
** All calls to ftruncate() within this file should be made through
** this wrapper. On the Android platform, bypassing the logic below
** could lead to a corrupt database.
*/
static int robust_ftruncate(int h, sqlite3_int64 sz){
int rc;