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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.c134
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;
-}