cosmopolitan/test/libc/calls/writev_test.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/iovec.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/limits.h"
#include "libc/macros.internal.h"
#include "libc/mem/gc.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/sock/sock.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/iov.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/testlib.h"

void SetUpOnce(void) {
  testlib_enable_tmp_setup_teardown();
  ASSERT_SYS(0, 0, pledge("stdio rpath wpath cpath fattr", 0));
}

TEST(writev, negativeFd_ebadf) {
  ASSERT_SYS(EBADF, -1, writev(-1, 0, 0));
}

TEST(writev, negativeCount_einval) {
  ASSERT_SYS(EINVAL, -1, writev(1, 0, -1));
}

TEST(writev, negative_einvalOrEfault) {
  struct iovec v[] = {{"", -1}};
  ASSERT_EQ(-1, writev(1, v, 1));
  ASSERT_TRUE(errno == EINVAL || errno == EFAULT);
  errno = 0;
}

TEST(writev, exceedsIovMax_einval) {
  if (IsWindows()) return;  // it's complicated
  int i, n = IOV_MAX + 1;
  struct iovec *v = gc(malloc(sizeof(struct iovec) * n));
  for (i = 0; i < n; ++i) {
    v[i].iov_base = "x";
    v[i].iov_len = 1;
  }
  ASSERT_SYS(EINVAL, -1, writev(1, v, n));
}

TEST(writev, test) {
  int fd;
  char ba[1] = "a";
  char bb[1] = "b";
  char bc[2] = "cd";
  struct iovec iov[] = {{"", 0}, {ba, 1}, {NULL, 0}, {bb, 1}, {bc, 2}};
  ASSERT_NE(-1, (fd = open("file", O_RDWR | O_CREAT | O_TRUNC, 0644)));
  EXPECT_EQ(4, writev(fd, iov, ARRAYLEN(iov)));
  EXPECT_EQ(1, lseek(fd, 1, SEEK_SET));
  EXPECT_EQ(3, readv(fd, iov, ARRAYLEN(iov)));
  EXPECT_EQ('b', ba[0]);
  EXPECT_EQ('c', bb[0]);
  EXPECT_EQ('d', bc[0]);
  EXPECT_NE(-1, close(fd));
}

TEST(writev, big_fullCompletion) {
  int fd;
  char *ba = gc(malloc(1024 * 1024));
  char *bb = gc(malloc(1024 * 1024));
  char *bc = gc(malloc(1024 * 1024));
  struct iovec iov[] = {
      {"", 0},            //
      {ba, 1024 * 1024},  //
      {NULL, 0},          //
      {bb, 1024 * 1024},  //
      {bc, 1024 * 1024},  //
  };
  ASSERT_NE(-1, (fd = open("file", O_RDWR | O_CREAT | O_TRUNC, 0644)));
  EXPECT_EQ(3 * 1024 * 1024, writev(fd, iov, ARRAYLEN(iov)));
  EXPECT_NE(-1, close(fd));
}

TEST(writev, asanError_efaults) {
  if (!IsAsan()) return;
  void *malloc_(size_t) asm("malloc");
  void free_(void *) asm("free");
  void *p;
  int fd;
  p = malloc_(32);
  EXPECT_NE(-1, (fd = open("asan", O_RDWR | O_CREAT | O_TRUNC, 0644)));
  EXPECT_EQ(32, write(fd, p, 32));
  EXPECT_NE(-1, lseek(fd, 0, SEEK_SET));
  EXPECT_EQ(32, read(fd, p, 32));
  EXPECT_EQ(-1, write(fd, p, 33));
  EXPECT_EQ(EFAULT, errno);
  EXPECT_EQ(-1, write(fd, p, -1));
  EXPECT_EQ(EFAULT, errno);
  free_(p);
  EXPECT_EQ(-1, write(fd, p, 32));
  EXPECT_EQ(EFAULT, errno);
  EXPECT_EQ(-1, read(fd, p, 32));
  EXPECT_EQ(EFAULT, errno);
  close(fd);
}

TEST(writev, empty_stillPerformsIoOperation) {
  int fd;
  struct iovec iov[] = {{"", 0}, {NULL, 0}};
  ASSERT_NE(-1, touch("file", 0644));
  ASSERT_NE(-1, (fd = open("file", O_RDONLY)));
  errno = 0;
  EXPECT_SYS(EBADF, -1, writev(fd, iov, ARRAYLEN(iov)));
  if (!(IsAarch64() && IsQemu())) {
    EXPECT_EQ(-1, writev(fd, NULL, 0));
  }
  EXPECT_NE(-1, close(fd));
}