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GeezerVison is showing github.com — sqlcipher/src/os_unix.c at master · securitykernel/sqlcipher Expand file tree/ Copy pathos_unix.cMore file actions 7904 lines (7301 loc) · 265 KB / Copy pathos_unix.cFile metadata and controls7904 lines (7301 loc) · 265 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* ** 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 labeled. ** ** 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__) # 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> #include <sys/stat.h> #include <fcntl.h> #include <sys/ioctl.h> #include <unistd.h> #include <time.h> #include <sys/time.h> #include <errno.h> #if !defined(SQLITE_OMIT_WAL) || SQLITE_MAX_MMAP_SIZE>0 # 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)) # 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 /* Always cast the getpid() return type for compatibility with ** kernel modules in VxWorks. */ #define osGetpid(X) (pid_t)getpid() /* ** 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 */ #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 */ #ifndef SQLITE_DISABLE_DIRSYNC # 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) { "fchmod", (sqlite3_syscall_ptr)fchmod, 0 }, #define osFchmod ((int(*)(int,mode_t))aSyscall[14].pCurrent) #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 { "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 { "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 */ /* ** 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 opon 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; osClose(fd); sqlite3_log(SQLITE_WARNING, "attempt to open \"%s\" as file descriptor %d", z, fd); fd = -1; if( osOpen("/dev/null", f, 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 and ** vxworksFileId 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; #ifdef __ANDROID__ /* On Android, ftruncate() always uses 32-bit offsets, even if ** _FILE_OFFSET_BITS=64 is defined. This means it is unsafe to attempt to ** truncate a file to any size larger than 2GiB. Silently ignore any ** such attempts. */ if( sz>(sqlite3_int64)0x7FFFFFFF ){ rc = SQLITE_OK; }else #endif do{ rc = osFtruncate(h,sz); }while( rc<0 && errno==EINTR ); return rc; } /* ** This routine translates a standard POSIX errno code into something ** useful to the clients of the sqlite3 functions. Specifically, it is ** intended to translate a variety of "try again" errors into SQLITE_BUSY ** and a variety of "please close the file descriptor NOW" errors into ** SQLITE_IOERR ** ** Errors during initialization of locks, or file system support for locks, ** should handle ENOLCK, ENOTSUP, EOPNOTSUPP separately. */ static int sqliteErrorFromPosixError(int posixError, int sqliteIOErr) { assert( (sqliteIOErr == SQLITE_IOERR_LOCK) || (sqliteIOErr == SQLITE_IOERR_UNLOCK) || (sqliteIOErr == SQLITE_IOERR_RDLOCK) || (sqliteIOErr == SQLITE_IOERR_CHECKRESERVEDLOCK) ); switch (posixError) { case EACCES: case EAGAIN: case ETIMEDOUT: case EBUSY: case EINTR: case ENOLCK: /* random NFS retry error, unless during file system support * introspection, in which it actually means what it says */ return SQLITE_BUSY; case EPERM: return SQLITE_PERM; default: return sqliteIOErr; } } /****************************************************************************** ****************** Begin Unique File ID Utility Used By VxWorks *************** ** ** On most versions of unix, we can get a unique ID for a file by concatenating ** the device number and the inode number. But this does not work on VxWorks. ** On VxWorks, a unique file id must be based on the canonical filename. ** ** A pointer to an instance of the following structure can be used as a ** unique file ID in VxWorks. Each instance of this structure contains ** a copy of the canonical filename. There is also a reference count. ** The structure is reclaimed when the number of pointers to it drops to ** zero. ** ** There are never very many files open at one time and lookups are not ** a performance-critical path, so it is sufficient to put these ** structures on a linked list. */ struct vxworksFileId { struct vxworksFileId *pNext; /* Next in a list of them all */ int nRef; /* Number of references to this one */ int nName; /* Length of the zCanonicalName[] string */ char *zCanonicalName; /* Canonical filename */ }; #if OS_VXWORKS /* ** All unique filenames are held on a linked list headed by this ** variable: */ static struct vxworksFileId *vxworksFileList = 0; /* ** Simplify a filename into its canonical form ** by making the following changes: ** ** * removing any trailing and duplicate / ** * convert /./ into just / ** * convert /A/../ where A is any simple name into just / ** ** Changes are made in-place. Return the new name length. ** ** The original filename is in z[0..n-1]. Return the number of ** characters in the simplified name. */ static int vxworksSimplifyName(char *z, int n){ int i, j; while( n>1 && z[n-1]=='/' ){ n--; } for(i=j=0; i<n; i++){ if( z[i]=='/' ){ if( z[i+1]=='/' ) continue; if( z[i+1]=='.' && i+2<n && z[i+2]=='/' ){ i += 1; continue; } if( z[i+1]=='.' && i+3<n && z[i+2]=='.' && z[i+3]=='/' ){ while( j>0 && z[j-1]!='/' ){ j--; } if( j>0 ){ j--; } i += 2; continue; } } z[j++] = z[i]; } z[j] = 0; return j; } /* ** Find a unique file ID for the given absolute pathname. Return ** a pointer to the vxworksFileId object. This pointer is the unique ** file ID. ** ** The nRef field of the vxworksFileId object is incremented before ** the object is returned. A new vxworksFileId object is created ** and added to the global list if necessary. ** ** If a memory allocation error occurs, return NULL. */ static struct vxworksFileId *vxworksFindFileId(const char *zAbsoluteName){ struct vxworksFileId *pNew; /* search key and new file ID */ struct vxworksFileId *pCandidate; /* For looping over existing file IDs */ int n; /* Length of zAbsoluteName string */ assert( zAbsoluteName[0]=='/' ); n = (int)strlen(zAbsoluteName); pNew = sqlite3_malloc64( sizeof(*pNew) + (n+1) ); if( pNew==0 ) return 0; pNew->zCanonicalName = (char*)&pNew[1]; memcpy(pNew->zCanonicalName, zAbsoluteName, n+1); n = vxworksSimplifyName(pNew->zCanonicalName, n); /* Search for an existing entry that matching the canonical name. ** If found, increment the reference count and return a pointer to ** the existing file ID. */ unixEnterMutex(); for(pCandidate=vxworksFileList; pCandidate; pCandidate=pCandidate->pNext){ if( pCandidate->nName==n && memcmp(pCandidate->zCanonicalName, pNew->zCanonicalName, n)==0 ){ sqlite3_free(pNew); pCandidate->nRef++; unixLeaveMutex(); return pCandidate; } } /* No match was found. We will make a new file ID */ pNew->nRef = 1; pNew->nName = n; pNew->pNext = vxworksFileList; vxworksFileList = pNew; unixLeaveMutex(); return pNew; |
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