585a3d7c22
survive a program crash or power failure. Ticket #599. (CVS 1210) FossilOrigin-Name: 597a59a72d662b291fb09a069547efd08aa5adb1
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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** This program tests the ability of SQLite database to recover from a crash.
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** This program runs under Unix only, but the results are applicable to all
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** systems.
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**
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** The main process first constructs a test database, then starts creating
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** subprocesses that write to that database. Each subprocess is killed off,
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** without a chance to clean up its database connection, after a random
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** delay. This killing of the subprocesses simulates a crash or power
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** failure. The next subprocess to open the database should rollback
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** whatever operation was in process at the time of the simulated crash.
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**
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** If any problems are encountered, an error is reported and the test stops.
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** If no problems are seen after a large number of tests, we assume that
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** the rollback mechanism is working.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sched.h>
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#include "sqlite.h"
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static void do_some_sql(int parent){
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char *zErr;
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int rc = SQLITE_OK;
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sqlite *db;
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int cnt = 0;
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static char zBig[] =
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"-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if( access("./test.db-journal",0)==0 ){
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/*printf("pid %d: journal exists. rollback will be required\n",getpid());*/ unlink("test.db-saved");
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system("cp test.db test.db-saved");
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unlink("test.db-journal-saved");
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system("cp test.db-journal test.db-journal-saved");
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}
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db = sqlite_open("./test.db", 0, &zErr);
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if( db==0 ){
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printf("ERROR: %s\n", zErr);
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if( strcmp(zErr,"database disk image is malformed")==0 ){
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kill(parent, SIGKILL);
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}
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exit(1);
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}
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srand(getpid());
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while( rc==SQLITE_OK ){
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cnt++;
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rc = sqlite_exec_printf(db,
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"INSERT INTO t1 VALUES(%d,'%d%s')", 0, 0, &zErr,
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rand(), rand(), zBig);
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}
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if( rc!=SQLITE_OK ){
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printf("ERROR #%d: %s\n", rc, zErr);
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if( rc==SQLITE_CORRUPT ){
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kill(parent, SIGKILL);
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}
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}
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printf("pid %d: cnt=%d\n", getpid(), cnt);
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}
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int main(int argc, char **argv){
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int i;
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sqlite *db;
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char *zErr;
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int status;
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int parent = getpid();
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unlink("test.db");
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unlink("test.db-journal");
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db = sqlite_open("test.db", 0, &zErr);
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if( db==0 ){
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printf("Cannot initialize: %s\n", zErr);
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return 1;
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}
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sqlite_exec(db, "CREATE TABLE t1(a,b)", 0, 0, 0);
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sqlite_close(db);
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for(i=0; i<10000; i++){
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int pid = fork();
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if( pid==0 ){
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sched_yield();
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do_some_sql(parent);
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return 0;
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}
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printf("test %d, pid=%d\n", i, pid);
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usleep(rand()%10000 + 1000);
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kill(pid, SIGKILL);
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waitpid(pid, &status, 0);
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}
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return 0;
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}
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