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//===-- Unittests for syscalls --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/unistd/syscall.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include "hdr/fcntl_macros.h"
#include <sys/stat.h> // For S_* flags.
#include <sys/syscall.h> // For syscall numbers.
#include <unistd.h>
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
using LlvmLibcSyscallTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
// We only do a smoke test here. Actual functionality tests are
// done by the unit tests of the syscall wrappers like mmap.
// The goal is to test syscalls with a wide number of args.
// There is no function named "syscall" in llvm-libc, we instead use a macro to
// set up the arguments properly. We still need to specify the namespace though
// because the macro generates a call to the actual internal function
// (__llvm_libc_syscall) which is inside the namespace.
TEST_F(LlvmLibcSyscallTest, TrivialCall) {
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_gettid), 0l);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcSyscallTest, SymlinkCreateDestroy) {
constexpr const char LINK_VAL[] = "syscall_readlink_test_value";
constexpr const char LINK[] = "testdata/syscall_readlink.test.link";
#ifdef SYS_symlink
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlink, LINK_VAL, LINK), 0l);
#elif defined(SYS_symlinkat)
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlinkat, LINK_VAL, AT_FDCWD, LINK),
0l);
#else
#error "symlink and symlinkat syscalls not available."
#endif
ASSERT_ERRNO_SUCCESS();
char buf[sizeof(LINK_VAL)];
#ifdef SYS_readlink
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_readlink, LINK, buf, sizeof(buf)), 0l);
#elif defined(SYS_readlinkat)
ASSERT_GE(
LIBC_NAMESPACE::syscall(SYS_readlinkat, AT_FDCWD, LINK, buf, sizeof(buf)),
0l);
#endif
ASSERT_ERRNO_SUCCESS();
#ifdef SYS_unlink
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, LINK), 0l);
#elif defined(SYS_unlinkat)
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, LINK, 0), 0l);
#else
#error "unlink and unlinkat syscalls not available."
#endif
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcSyscallTest, FileReadWrite) {
constexpr const char HELLO[] = "hello";
constexpr int HELLO_SIZE = sizeof(HELLO);
constexpr const char *TEST_FILE = "testdata/syscall_pread_pwrite.test";
#ifdef SYS_open
long fd =
LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
#elif defined(SYS_openat)
long fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE,
O_WRONLY | O_CREAT, S_IRWXU);
#else
#error "open and openat syscalls not available."
#endif
ASSERT_GT(fd, 0l);
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_pwrite64, fd, HELLO, HELLO_SIZE, 0),
0l);
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_fsync, fd), 0l);
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, fd), 0l);
ASSERT_ERRNO_SUCCESS();
}
TEST_F(LlvmLibcSyscallTest, FileLinkCreateDestroy) {
constexpr const char *TEST_DIR = "testdata";
constexpr const char *TEST_FILE = "syscall_linkat.test";
constexpr const char *TEST_FILE_PATH = "testdata/syscall_linkat.test";
constexpr const char *TEST_FILE_LINK = "syscall_linkat.test.link";
constexpr const char *TEST_FILE_LINK_PATH =
"testdata/syscall_linkat.test.link";
// The test strategy is as follows:
// 1. Create a normal file
// 2. Create a link to that file.
// 3. Open the link to check that the link was created.
// 4. Cleanup the file and its link.
#ifdef SYS_open
long write_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_PATH,
O_WRONLY | O_CREAT, S_IRWXU);
#elif defined(SYS_openat)
long write_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE_PATH,
O_WRONLY | O_CREAT, S_IRWXU);
#else
#error "open and openat syscalls not available."
#endif
ASSERT_GT(write_fd, 0l);
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, write_fd), 0l);
ASSERT_ERRNO_SUCCESS();
#ifdef SYS_open
long dir_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_DIR, O_DIRECTORY, 0);
#elif defined(SYS_openat)
long dir_fd =
LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_DIR, O_DIRECTORY, 0);
#else
#error "open and openat syscalls not available."
#endif
ASSERT_GT(dir_fd, 0l);
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_linkat, dir_fd, TEST_FILE, dir_fd,
TEST_FILE_LINK, 0),
0l);
ASSERT_ERRNO_SUCCESS();
#ifdef SYS_open
long link_fd =
LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_LINK_PATH, O_PATH, 0);
#elif defined(SYS_openat)
long link_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD,
TEST_FILE_LINK_PATH, O_PATH, 0);
#else
#error "open and openat syscalls not available."
#endif
ASSERT_GT(link_fd, 0l);
ASSERT_ERRNO_SUCCESS();
#ifdef SYS_unlink
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_PATH), 0l);
#elif defined(SYS_unlinkat)
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_PATH, 0),
0l);
#else
#error "unlink and unlinkat syscalls not available."
#endif
ASSERT_ERRNO_SUCCESS();
#ifdef SYS_unlink
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_LINK_PATH), 0l);
#elif defined(SYS_unlinkat)
ASSERT_GE(
LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_LINK_PATH, 0),
0l);
#else
#error "unlink and unlinkat syscalls not available."
#endif
ASSERT_ERRNO_SUCCESS();
ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, dir_fd), 0l);
ASSERT_ERRNO_SUCCESS();
}
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