1 /* 2 ** This program tests the ability of SQLite database to recover from a crash. 3 ** This program runs under Unix only, but the results are applicable to all 4 ** systems. 5 ** 6 ** The main process first constructs a test database, then starts creating 7 ** subprocesses that write to that database. Each subprocess is killed off, 8 ** without a chance to clean up its database connection, after a random 9 ** delay. This killing of the subprocesses simulates a crash or power 10 ** failure. The next subprocess to open the database should rollback 11 ** whatever operation was in process at the time of the simulated crash. 12 ** 13 ** If any problems are encountered, an error is reported and the test stops. 14 ** If no problems are seen after a large number of tests, we assume that 15 ** the rollback mechanism is working. 16 */ 17 #include <stdio.h> 18 #include <unistd.h> 19 #include <sys/types.h> 20 #include <sys/wait.h> 21 #include <signal.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <sched.h> 25 #include "sqlite.h" 26 27 static void do_some_sql(int parent){ 28 char *zErr; 29 int rc = SQLITE_OK; 30 sqlite *db; 31 int cnt = 0; 32 static char zBig[] = 33 "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" 34 "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 35 36 if( access("./test.db-journal",0)==0 ){ 37 /*printf("pid %d: journal exists. rollback will be required\n",getpid());*/ unlink("test.db-saved"); 38 system("cp test.db test.db-saved"); 39 unlink("test.db-journal-saved"); 40 system("cp test.db-journal test.db-journal-saved"); 41 } 42 db = sqlite_open("./test.db", 0, &zErr); 43 if( db==0 ){ 44 printf("ERROR: %s\n", zErr); 45 if( strcmp(zErr,"database disk image is malformed")==0 ){ 46 kill(parent, SIGKILL); 47 } 48 exit(1); 49 } 50 srand(getpid()); 51 while( rc==SQLITE_OK ){ 52 cnt++; 53 rc = sqlite_exec_printf(db, 54 "INSERT INTO t1 VALUES(%d,'%d%s')", 0, 0, &zErr, 55 rand(), rand(), zBig); 56 } 57 if( rc!=SQLITE_OK ){ 58 printf("ERROR #%d: %s\n", rc, zErr); 59 if( rc==SQLITE_CORRUPT ){ 60 kill(parent, SIGKILL); 61 } 62 } 63 printf("pid %d: cnt=%d\n", getpid(), cnt); 64 } 65 66 67 int main(int argc, char **argv){ 68 int i; 69 sqlite *db; 70 char *zErr; 71 int status; 72 int parent = getpid(); 73 74 unlink("test.db"); 75 unlink("test.db-journal"); 76 db = sqlite_open("test.db", 0, &zErr); 77 if( db==0 ){ 78 printf("Cannot initialize: %s\n", zErr); 79 return 1; 80 } 81 sqlite_exec(db, "CREATE TABLE t1(a,b)", 0, 0, 0); 82 sqlite_close(db); 83 for(i=0; i<10000; i++){ 84 int pid = fork(); 85 if( pid==0 ){ 86 sched_yield(); 87 do_some_sql(parent); 88 return 0; 89 } 90 printf("test %d, pid=%d\n", i, pid); 91 usleep(rand()%10000 + 1000); 92 kill(pid, SIGKILL); 93 waitpid(pid, &status, 0); 94 } 95 return 0; 96 } 97