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third_party/sqlite/src/test/crashtest1.c

Index: third_party/sqlite/src/test/crashtest1.c
diff --git a/third_party/sqlite/src/test/crashtest1.c b/third_party/sqlite/src/test/crashtest1.c
new file mode 100644
index 0000000000000000000000000000000000000000..1f7035d18ea78d137272a6d76edbe1909549c414
--- /dev/null
+++ b/third_party/sqlite/src/test/crashtest1.c
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+/*
+** This program tests the ability of SQLite database to recover from a crash.
+** This program runs under Unix only, but the results are applicable to all
+** systems.
+**
+** The main process first constructs a test database, then starts creating
+** subprocesses that write to that database.  Each subprocess is killed off,
+** without a chance to clean up its database connection, after a random
+** delay.  This killing of the subprocesses simulates a crash or power
+** failure.  The next subprocess to open the database should rollback
+** whatever operation was in process at the time of the simulated crash.
+**
+** If any problems are encountered, an error is reported and the test stops.
+** If no problems are seen after a large number of tests, we assume that
+** the rollback mechanism is working.
+*/
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sched.h>
+#include "sqlite.h"
+
+static void do_some_sql(int parent){
+  char *zErr;
+  int rc = SQLITE_OK;
+  sqlite *db;
+  int cnt = 0;
+  static char zBig[] = 
+    "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+  if( access("./test.db-journal",0)==0 ){
+    /*printf("pid %d: journal exists.  rollback will be required\n",getpid());*/    unlink("test.db-saved");
+    system("cp test.db test.db-saved");
+    unlink("test.db-journal-saved");
+    system("cp test.db-journal test.db-journal-saved");
+  }
+  db = sqlite_open("./test.db", 0, &zErr);
+  if( db==0 ){
+    printf("ERROR: %s\n", zErr);
+    if( strcmp(zErr,"database disk image is malformed")==0 ){
+      kill(parent, SIGKILL);
+    }
+    exit(1);
+  }
+  srand(getpid());
+  while( rc==SQLITE_OK ){
+    cnt++;
+    rc = sqlite_exec_printf(db, 
+       "INSERT INTO t1 VALUES(%d,'%d%s')", 0, 0, &zErr,
+       rand(), rand(), zBig);
+  }
+  if( rc!=SQLITE_OK ){
+    printf("ERROR #%d: %s\n", rc, zErr);
+    if( rc==SQLITE_CORRUPT ){
+      kill(parent, SIGKILL);
+    }
+  }
+  printf("pid %d: cnt=%d\n", getpid(), cnt);
+}
+
+
+int main(int argc, char **argv){
+  int i;
+  sqlite *db;
+  char *zErr;
+  int status;
+  int parent = getpid();
+
+  unlink("test.db");
+  unlink("test.db-journal");
+  db = sqlite_open("test.db", 0, &zErr);
+  if( db==0 ){
+    printf("Cannot initialize: %s\n", zErr);
+    return 1;
+  }
+  sqlite_exec(db, "CREATE TABLE t1(a,b)", 0, 0, 0);
+  sqlite_close(db);
+  for(i=0; i<10000; i++){
+    int pid = fork();
+    if( pid==0 ){
+      sched_yield();
+      do_some_sql(parent);
+      return 0;
+    }
+    printf("test %d, pid=%d\n", i, pid);
+    usleep(rand()%10000 + 1000);
+    kill(pid, SIGKILL);
+    waitpid(pid, &status, 0);
+  }
+  return 0;
+}