Tests: Add LibC stdlib mktmp function tests for unique filenames

Userland/Tests/LibC/stdlib-generate-unique-filename.cpp

@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/String.h>
+#include <LibCore/File.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <mman.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+static void test_mktemp_unique_filename()
+{
+    u8* ptr = (u8*)mmap(nullptr, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+    assert(ptr != MAP_FAILED);
+
+    if (fork() == 0) {
+        char path[] = "/tmp/test.mktemp.XXXXXX";
+        auto temp_path = String::formatted("{}", mktemp(path));
+        assert(temp_path.characters());
+        unlink(path);
+
+        memcpy(&ptr[0], temp_path.characters(), temp_path.length());
+
+        exit(EXIT_SUCCESS);
+    } else {
+        wait(NULL);
+
+        auto path1 = String::formatted("{}", reinterpret_cast<const char*>(ptr));
+
+        char path[] = "/tmp/test.mktemp.XXXXXX";
+        auto path2 = String::formatted("{}", mktemp(path));
+        assert(path2.characters());
+        unlink(path);
+
+        assert(path1 != path2);
+    }
+
+    munmap(ptr, sizeof(*ptr));
+}
+
+static void test_mkdtemp_unique_filename()
+{
+    u8* ptr = (u8*)mmap(nullptr, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+    assert(ptr != MAP_FAILED);
+
+    if (fork() == 0) {
+        char path[] = "/tmp/test.mkdtemp.XXXXXX";
+        auto temp_path = String::formatted("{}", mkdtemp(path));
+        assert(temp_path.characters());
+        rmdir(path);
+
+        memcpy(&ptr[0], temp_path.characters(), temp_path.length());
+
+        exit(EXIT_SUCCESS);
+    } else {
+        wait(NULL);
+
+        auto path1 = String::formatted("{}", reinterpret_cast<const char*>(ptr));
+
+        char path[] = "/tmp/test.mkdtemp.XXXXXX";
+        auto path2 = String::formatted("{}", mkdtemp(path));
+        assert(path2.characters());
+        rmdir(path);
+
+        assert(path1 != path2);
+    }
+
+    munmap(ptr, sizeof(*ptr));
+}
+static void test_mkstemp_unique_filename()
+{
+    u8* ptr = (u8*)mmap(nullptr, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+    assert(ptr != MAP_FAILED);
+
+    if (fork() == 0) {
+        char path[] = "/tmp/test.mkstemp.XXXXXX";
+        auto fd = mkstemp(path);
+        assert(fd != -1);
+
+        auto temp_path = Core::File::read_link(String::formatted("/proc/{}/fd/{}", getpid(), fd));
+        assert(temp_path.characters());
+
+        close(fd);
+        unlink(path);
+
+        memcpy(&ptr[0], temp_path.characters(), temp_path.length());
+
+        exit(EXIT_SUCCESS);
+    } else {
+        wait(NULL);
+
+        auto path1 = String::formatted("{}", reinterpret_cast<const char*>(ptr));
+
+        char path[] = "/tmp/test.mkstemp.XXXXXX";
+        auto fd = mkstemp(path);
+        assert(fd != -1);
+
+        auto path2 = Core::File::read_link(String::formatted("/proc/{}/fd/{}", getpid(), fd));
+        assert(path2.characters());
+
+        close(fd);
+        unlink(path);
+
+        assert(path1 != path2);
+    }
+
+    munmap(ptr, sizeof(*ptr));
+}
+
+int main()
+{
+#define RUNTEST(x)                      \
+    {                                   \
+        printf("Running " #x " ...\n"); \
+        x();                            \
+        printf("Success!\n");           \
+    }
+    RUNTEST(test_mktemp_unique_filename);
+    RUNTEST(test_mkstemp_unique_filename);
+    RUNTEST(test_mkdtemp_unique_filename);
+    printf("PASS\n");
+
+    return 0;
+}