#239 fix dbremove crash when NOFILE limit is exceeded

src/tests/dbremove-nofile-limit.cc

+/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
+/*
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+  it under the terms of version 2 of the GNU General Public License as
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+
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+
+  You should have received a copy of the GNU General Public License
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+COPYRIGHT NOTICE:
+
+  TokuDB, Tokutek Fractal Tree Indexing Library.
+  Copyright (C) 2007-2013 Tokutek, Inc.
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+DISCLAIMER:
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+  This program is distributed in the hope that it will be useful, but
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+  General Public License for more details.
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+UNIVERSITY PATENT NOTICE:
+
+  The technology is licensed by the Massachusetts Institute of
+  Technology, Rutgers State University of New Jersey, and the Research
+  Foundation of State University of New York at Stony Brook under
+  United States of America Serial No. 11/760379 and to the patents
+  and/or patent applications resulting from it.
+
+PATENT MARKING NOTICE:
+
+  This software is covered by US Patent No. 8,185,551.
+  This software is covered by US Patent No. 8,489,638.
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+*/
+
+#ident "Copyright (c) 2014 Tokutek Inc.  All rights reserved."
+#ident "$Id$"
+
+// This test verifies that the env->dbremove function returns an error rather than
+// crash when the NOFILE resource limit is exceeded.
+
+#include "test.h"
+#include <db.h>
+#include <sys/resource.h>
+
+static const char *envdir = TOKU_TEST_FILENAME;
+
+static void test_dbremove() {
+    int r;
+
+    char rmcmd[32 + strlen(envdir)];
+    snprintf(rmcmd, sizeof rmcmd, "rm -rf %s", envdir);
+    r = system(rmcmd);                                                                             CKERR(r);
+    r = toku_os_mkdir(envdir, S_IRWXU+S_IRWXG+S_IRWXO);                                                       CKERR(r);
+
+    DB_ENV *env;
+    r = db_env_create(&env, 0);                                                                               CKERR(r);
+    int envflags = DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN | DB_CREATE | DB_PRIVATE;
+    r = env->open(env, envdir, envflags, S_IRWXU+S_IRWXG+S_IRWXO);                                            CKERR(r);
+    env->set_errfile(env, stderr);
+
+    DB *db;
+    r = db_create(&db, env, 0); CKERR(r);
+    char fname[32];
+    sprintf(fname, "db%d", 0);
+    r = db->open(db, nullptr, fname, nullptr, DB_BTREE, DB_CREATE, 0666); CKERR(r);
+
+    r = db->close(db, 0); CKERR(r);
+
+    DB_TXN *txn;
+    r = env->txn_begin(env, nullptr, &txn, 0); CKERR(r);
+
+    struct rlimit current_limit;
+    r = getrlimit(RLIMIT_NOFILE, &current_limit);
+    assert(r == 0);
+    
+    struct rlimit new_limit = current_limit;
+    new_limit.rlim_cur = 0;
+    r = setrlimit(RLIMIT_NOFILE, &new_limit);
+    assert(r == 0);
+
+    r = env->dbremove(env, txn, fname, nullptr, 0);
+    CKERR2(r, EMFILE);
+
+    r = setrlimit(RLIMIT_NOFILE, &current_limit);
+    assert(r == 0);
+
+    r = env->dbremove(env, txn, fname, nullptr, 0);
+    CKERR(r);
+    
+    r = txn->commit(txn, 0); CKERR(r);
+
+    r = env->close(env, 0); CKERR(r);
+}
+
+static void do_args(int argc, char * const argv[]) {
+    int resultcode;
+    char *cmd = argv[0];
+    argc--; argv++;
+    while (argc>0) {
+        if (strcmp(argv[0], "-h")==0) {
+	    resultcode=0;
+	do_usage:
+	    fprintf(stderr, "Usage: %s -h -v -q\n", cmd);
+	    exit(resultcode);
+	} else if (strcmp(argv[0], "-v")==0) {
+	    verbose++;
+	} else if (strcmp(argv[0],"-q")==0) {
+	    verbose--;
+	    if (verbose<0) verbose=0;
+	} else {
+	    fprintf(stderr, "Unknown arg: %s\n", argv[0]);
+	    resultcode=1;
+	    goto do_usage;
+	}
+	argc--;
+	argv++;
+    }
+}
+
+int test_main(int argc, char * const *argv) {
+    do_args(argc, argv);
+    test_dbremove();
+    return 0;
+}

src/ydb.cc

@@ -2807,7 +2807,13 @@ env_dbremove(DB_ENV * env, DB_TXN *txn, const char *fname, const char *dbname, u
     r = toku_db_create(&db, env, 0);
     lazy_assert_zero(r);
     r = toku_db_open_iname(db, txn, iname, 0, 0);
-    lazy_assert_zero(r);
+    if (txn && r) {
+        if (r == EMFILE || r == ENFILE)
+            r = toku_ydb_do_error(env, r, "toku dbremove failed because open file limit reached\n");
+        else
+            r = toku_ydb_do_error(env, r, "toku dbremove failed\n");
+        goto exit;
+    }
     if (txn) {
         // Now that we have a writelock on dname, verify that there are still no handles open. (to prevent race conditions)
         if (env_is_db_with_dname_open(env, dname)) {