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