libc/test/src/unistd/syscall_test.cpp

   1 //===-- Unittests for syscalls --------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/errno/libc_errno.h"
  10 #include "src/unistd/syscall.h"
  11 #include "test/UnitTest/ErrnoSetterMatcher.h"
  12 #include "test/UnitTest/Test.h"
  13
  14 #include "hdr/fcntl_macros.h"
  15 #include <sys/stat.h>    // For S_* flags.
  16 #include <sys/syscall.h> // For syscall numbers.
  17 #include <unistd.h>
  18
  19 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
  20
  21 // We only do a smoke test here. Actual functionality tests are
  22 // done by the unit tests of the syscall wrappers like mmap.
  23 // The goal is to test syscalls with a wide number of args.
  24
  25 // There is no function named "syscall" in llvm-libc, we instead use a macro to
  26 // set up the arguments properly. We still need to specify the namespace though
  27 // because the macro generates a call to the actual internal function
  28 // (__llvm_libc_syscall) which is inside the namespace.
  29 TEST(LlvmLibcSyscallTest, TrivialCall) {
  30   LIBC_NAMESPACE::libc_errno = 0;
  31
  32   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_gettid), 0l);
  33   ASSERT_ERRNO_SUCCESS();
  34 }
  35
  36 TEST(LlvmLibcSyscallTest, SymlinkCreateDestroy) {
  37   constexpr const char LINK_VAL[] = "syscall_readlink_test_value";
  38   constexpr const char LINK[] = "testdata/syscall_readlink.test.link";
  39
  40 #ifdef SYS_symlink
  41   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlink, LINK_VAL, LINK), 0l);
  42 #elif defined(SYS_symlinkat)
  43   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlinkat, LINK_VAL, AT_FDCWD, LINK),
  44             0l);
  45 #else
  46 #error "symlink and symlinkat syscalls not available."
  47 #endif
  48   ASSERT_ERRNO_SUCCESS();
  49
  50   char buf[sizeof(LINK_VAL)];
  51
  52 #ifdef SYS_readlink
  53   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_readlink, LINK, buf, sizeof(buf)), 0l);
  54 #elif defined(SYS_readlinkat)
  55   ASSERT_GE(
  56       LIBC_NAMESPACE::syscall(SYS_readlinkat, AT_FDCWD, LINK, buf, sizeof(buf)),
  57       0l);
  58 #endif
  59   ASSERT_ERRNO_SUCCESS();
  60
  61 #ifdef SYS_unlink
  62   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, LINK), 0l);
  63 #elif defined(SYS_unlinkat)
  64   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, LINK, 0), 0l);
  65 #else
  66 #error "unlink and unlinkat syscalls not available."
  67 #endif
  68   ASSERT_ERRNO_SUCCESS();
  69 }
  70
  71 TEST(LlvmLibcSyscallTest, FileReadWrite) {
  72   constexpr const char HELLO[] = "hello";
  73   constexpr int HELLO_SIZE = sizeof(HELLO);
  74
  75   constexpr const char *TEST_FILE = "testdata/syscall_pread_pwrite.test";
  76
  77 #ifdef SYS_open
  78   int fd =
  79       LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
  80 #elif defined(SYS_openat)
  81   int fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE,
  82                                    O_WRONLY | O_CREAT, S_IRWXU);
  83 #else
  84 #error "open and openat syscalls not available."
  85 #endif
  86   ASSERT_GT(fd, 0);
  87   ASSERT_ERRNO_SUCCESS();
  88
  89   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_pwrite64, fd, HELLO, HELLO_SIZE, 0),
  90             0l);
  91   ASSERT_ERRNO_SUCCESS();
  92
  93   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_fsync, fd), 0l);
  94   ASSERT_ERRNO_SUCCESS();
  95
  96   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, fd), 0l);
  97   ASSERT_ERRNO_SUCCESS();
  98 }
  99
 100 TEST(LlvmLibcSyscallTest, FileLinkCreateDestroy) {
 101   constexpr const char *TEST_DIR = "testdata";
 102   constexpr const char *TEST_FILE = "syscall_linkat.test";
 103   constexpr const char *TEST_FILE_PATH = "testdata/syscall_linkat.test";
 104   constexpr const char *TEST_FILE_LINK = "syscall_linkat.test.link";
 105   constexpr const char *TEST_FILE_LINK_PATH =
 106       "testdata/syscall_linkat.test.link";
 107
 108   // The test strategy is as follows:
 109   //   1. Create a normal file
 110   //   2. Create a link to that file.
 111   //   3. Open the link to check that the link was created.
 112   //   4. Cleanup the file and its link.
 113
 114 #ifdef SYS_open
 115   int write_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_PATH,
 116                                          O_WRONLY | O_CREAT, S_IRWXU);
 117 #elif defined(SYS_openat)
 118   int write_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE_PATH,
 119                                          O_WRONLY | O_CREAT, S_IRWXU);
 120 #else
 121 #error "open and openat syscalls not available."
 122 #endif
 123   ASSERT_GT(write_fd, 0);
 124   ASSERT_ERRNO_SUCCESS();
 125
 126   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, write_fd), 0l);
 127   ASSERT_ERRNO_SUCCESS();
 128
 129 #ifdef SYS_open
 130   int dir_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_DIR, O_DIRECTORY, 0);
 131 #elif defined(SYS_openat)
 132   int dir_fd =
 133       LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_DIR, O_DIRECTORY, 0);
 134 #else
 135 #error "open and openat syscalls not available."
 136 #endif
 137   ASSERT_GT(dir_fd, 0);
 138   ASSERT_ERRNO_SUCCESS();
 139
 140   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_linkat, dir_fd, TEST_FILE, dir_fd,
 141                                     TEST_FILE_LINK, 0),
 142             0l);
 143   ASSERT_ERRNO_SUCCESS();
 144 #ifdef SYS_open
 145   int link_fd =
 146       LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_LINK_PATH, O_PATH, 0);
 147 #elif defined(SYS_openat)
 148   int link_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD,
 149                                         TEST_FILE_LINK_PATH, O_PATH, 0);
 150 #else
 151 #error "open and openat syscalls not available."
 152 #endif
 153   ASSERT_GT(link_fd, 0);
 154   ASSERT_ERRNO_SUCCESS();
 155
 156 #ifdef SYS_unlink
 157   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_PATH), 0l);
 158 #elif defined(SYS_unlinkat)
 159   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_PATH, 0),
 160             0l);
 161 #else
 162 #error "unlink and unlinkat syscalls not available."
 163 #endif
 164   ASSERT_ERRNO_SUCCESS();
 165
 166 #ifdef SYS_unlink
 167   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_LINK_PATH), 0l);
 168 #elif defined(SYS_unlinkat)
 169   ASSERT_GE(
 170       LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_LINK_PATH, 0),
 171       0l);
 172 #else
 173 #error "unlink and unlinkat syscalls not available."
 174 #endif
 175   ASSERT_ERRNO_SUCCESS();
 176
 177   ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, dir_fd), 0l);
 178   ASSERT_ERRNO_SUCCESS();
 179 }