diff options
Diffstat (limited to 'chromium/third_party/sqlite/sqlite-src-3240000/tool/getlock.c')
-rw-r--r-- | chromium/third_party/sqlite/sqlite-src-3240000/tool/getlock.c | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/chromium/third_party/sqlite/sqlite-src-3240000/tool/getlock.c b/chromium/third_party/sqlite/sqlite-src-3240000/tool/getlock.c deleted file mode 100644 index 7eff04d7f97..00000000000 --- a/chromium/third_party/sqlite/sqlite-src-3240000/tool/getlock.c +++ /dev/null @@ -1,134 +0,0 @@ -/* -** This utility program looks at an SQLite database and determines whether -** or not it is locked, the kind of lock, and who is holding this lock. -** -** This only works on unix when the posix advisory locking method is used -** (which is the default on unix) and when the PENDING_BYTE is in its -** usual place. -*/ -#include <sys/types.h> -#include <sys/stat.h> -#include <unistd.h> -#include <fcntl.h> -#include <string.h> -#include <stdio.h> -#include <stdlib.h> -#include <errno.h> - -static void usage(const char *argv0){ - fprintf(stderr, "Usage: %s database\n", argv0); - exit(1); -} - -/* Check for a conflicting lock. If one is found, print an this -** on standard output using the format string given and return 1. -** If there are no conflicting locks, return 0. -*/ -static int isLocked( - int h, /* File descriptor to check */ - int type, /* F_RDLCK or F_WRLCK */ - unsigned int iOfst, /* First byte of the lock */ - unsigned int iCnt, /* Number of bytes in the lock range */ - const char *zType /* Type of lock */ -){ - struct flock lk; - - memset(&lk, 0, sizeof(lk)); - lk.l_type = type; - lk.l_whence = SEEK_SET; - lk.l_start = iOfst; - lk.l_len = iCnt; - if( fcntl(h, F_GETLK, &lk)==(-1) ){ - fprintf(stderr, "fcntl(%d) failed: errno=%d\n", h, errno); - exit(1); - } - if( lk.l_type==F_UNLCK ) return 0; - printf("%s lock held by %d\n", zType, (int)lk.l_pid); - return 1; -} - -/* -** Location of locking bytes in the database file -*/ -#define PENDING_BYTE (0x40000000) -#define RESERVED_BYTE (PENDING_BYTE+1) -#define SHARED_FIRST (PENDING_BYTE+2) -#define SHARED_SIZE 510 - -/* -** Lock locations for shared-memory locks used by WAL mode. -*/ -#define SHM_BASE 120 -#define SHM_WRITE SHM_BASE -#define SHM_CHECKPOINT (SHM_BASE+1) -#define SHM_RECOVER (SHM_BASE+2) -#define SHM_READ_FIRST (SHM_BASE+3) -#define SHM_READ_SIZE 5 - - -int main(int argc, char **argv){ - int hDb; /* File descriptor for the open database file */ - int hShm; /* File descriptor for WAL shared-memory file */ - char *zShm; /* Name of the shared-memory file for WAL mode */ - ssize_t got; /* Bytes read from header */ - int isWal; /* True if in WAL mode */ - int nName; /* Length of filename */ - unsigned char aHdr[100]; /* Database header */ - int nLock = 0; /* Number of locks held */ - int i; /* Loop counter */ - - if( argc!=2 ) usage(argv[0]); - hDb = open(argv[1], O_RDONLY, 0); - if( hDb<0 ){ - fprintf(stderr, "cannot open %s\n", argv[1]); - return 1; - } - - /* Make sure we are dealing with an database file */ - got = read(hDb, aHdr, 100); - if( got!=100 || memcmp(aHdr, "SQLite format 3",16)!=0 ){ - fprintf(stderr, "not an SQLite database: %s\n", argv[1]); - exit(1); - } - - /* First check for an exclusive lock */ - if( isLocked(hDb, F_RDLCK, SHARED_FIRST, SHARED_SIZE, "EXCLUSIVE") ){ - return 0; - } - isWal = aHdr[18]==2; - if( isWal==0 ){ - /* Rollback mode */ - if( isLocked(hDb, F_RDLCK, PENDING_BYTE, 1, "PENDING") ) return 0; - if( isLocked(hDb, F_RDLCK, RESERVED_BYTE, 1, "RESERVED") ) return 0; - if( isLocked(hDb, F_WRLCK, SHARED_FIRST, SHARED_SIZE, "SHARED") ){ - return 0; - } - }else{ - /* WAL mode */ - nName = (int)strlen(argv[1]); - zShm = malloc( nName + 100 ); - if( zShm==0 ){ - fprintf(stderr, "out of memory\n"); - exit(1); - } - memcpy(zShm, argv[1], nName); - memcpy(&zShm[nName], "-shm", 5); - hShm = open(zShm, O_RDONLY, 0); - if( hShm<0 ){ - fprintf(stderr, "cannot open %s\n", zShm); - return 1; - } - if( isLocked(hShm, F_RDLCK, SHM_RECOVER, 1, "WAL-RECOVERY") ){ - return 0; - } - nLock += isLocked(hShm, F_RDLCK, SHM_CHECKPOINT, 1, "WAL-CHECKPOINT"); - nLock += isLocked(hShm, F_RDLCK, SHM_WRITE, 1, "WAL-WRITE"); - for(i=0; i<SHM_READ_SIZE; i++){ - nLock += isLocked(hShm, F_WRLCK, SHM_READ_FIRST+i, 1, "WAL-READ"); - } - } - if( nLock==0 ){ - printf("file is not locked\n"); - } - return 0; -} |