extern "C" intptr_t SystemNative_MksTemps(char* pathTemplate, int32_t suffixLength)
{
intptr_t result;
#if HAVE_MKSTEMPS
while (CheckInterrupted(result = mkstemps(pathTemplate, suffixLength)));
#elif HAVE_MKSTEMP
// mkstemps is not available bionic/Android, but mkstemp is
// mkstemp doesn't allow the suffix that msktemps does allow, so we'll need to
// remove that before passing pathTemplate to mkstemp
int32_t pathTemplateLength = static_cast<int32_t>(strlen(pathTemplate));
// pathTemplate must include at least XXXXXX (6 characters) which are not part of
// the suffix
if (suffixLength < 0 || suffixLength > pathTemplateLength - 6)
{
errno = EINVAL;
return -1;
}
// Make mkstemp ignore the suffix by setting the first char of the suffix to \0,
// if there is a suffix
int32_t firstSuffixIndex = 0;
char firstSuffixChar = 0;
if (suffixLength > 0)
{
firstSuffixIndex = pathTemplateLength - suffixLength;
firstSuffixChar = pathTemplate[firstSuffixIndex];
pathTemplate[firstSuffixIndex] = 0;
}
while (CheckInterrupted(result = mkstemp(pathTemplate)));
// Reset the first char of the suffix back to its original value, if there is a suffix
if (suffixLength > 0)
{
pathTemplate[firstSuffixIndex] = firstSuffixChar;
}
#else
#error "Cannot find mkstemps nor mkstemp on this platform"
#endif
return result;
}
extern "C" int32_t SystemNative_Pipe(int32_t pipeFds[2], int32_t flags)
{
switch (flags)
{
case 0:
break;
case PAL_O_CLOEXEC:
flags = O_CLOEXEC;
break;
default:
assert(false && "Unknown flag.");
errno = EINVAL;
return -1;
}
int32_t result;
#if HAVE_PIPE2
// If pipe2 is available, use it. This will handle O_CLOEXEC if it was set.
while (CheckInterrupted(result = pipe2(pipeFds, flags)));
#else
// Otherwise, use pipe.
while (CheckInterrupted(result = pipe(pipeFds)));
// Then, if O_CLOEXEC was specified, use fcntl to configure the file descriptors appropriately.
if ((flags & O_CLOEXEC) != 0 && result == 0)
{
while (CheckInterrupted(result = fcntl(pipeFds[0], F_SETFD, FD_CLOEXEC)));
if (result == 0)
{
while (CheckInterrupted(result = fcntl(pipeFds[1], F_SETFD, FD_CLOEXEC)));
}
if (result != 0)
{
int tmpErrno = errno;
close(pipeFds[0]);
close(pipeFds[1]);
errno = tmpErrno;
}
}
#endif
return result;
}
extern "C" void SystemNative_ReadEvents(int32_t sock, NetworkChangeEvent onNetworkChange)
{
char buffer[4096];
iovec iov = {buffer, sizeof(buffer)};
sockaddr_nl sanl;
msghdr msg = { .msg_name = reinterpret_cast<void*>(&sanl), .msg_namelen = sizeof(sockaddr_nl), .msg_iov = &iov, .msg_iovlen = 1 };
ssize_t len;
while (CheckInterrupted(len = recvmsg(sock, &msg, 0)));
if (len == -1)
{
// Probably means the socket has been closed.
return;
}
for (nlmsghdr* hdr = reinterpret_cast<nlmsghdr*>(buffer); NLMSG_OK(hdr, UnsignedCast(len)); NLMSG_NEXT(hdr, len))
{
switch (hdr->nlmsg_type)
{
case NLMSG_DONE:
return; // End of a multi-part message; stop reading.
case NLMSG_ERROR:
return;
case RTM_NEWADDR:
onNetworkChange(sock, NetworkChangeKind::AddressAdded);
break;
case RTM_DELADDR:
onNetworkChange(sock, NetworkChangeKind::AddressRemoved);
break;
case RTM_NEWLINK:
onNetworkChange(sock, ReadNewLinkMessage(hdr));
break;
case RTM_DELLINK:
onNetworkChange(sock, NetworkChangeKind::LinkRemoved);
break;
default:
break;
}
}
}
NetworkChangeKind ReadNewLinkMessage(nlmsghdr* hdr)
{
assert(hdr != nullptr);
ifinfomsg* ifimsg;
ifimsg = reinterpret_cast<ifinfomsg*>(NLMSG_DATA(hdr));
if (ifimsg->ifi_family == AF_INET)
{
if ((ifimsg->ifi_flags & IFF_UP) != 0)
{
return NetworkChangeKind::LinkAdded;
}
}
return NetworkChangeKind::None;
}
static void WriteKeypadXmit()
{
// If a terminfo "application mode" keypad_xmit string has been supplied,
// write it out to the terminal to enter the mode.
if (g_keypadXmit != NULL)
{
ssize_t ret;
while (CheckInterrupted(ret = write(STDOUT_FILENO, g_keypadXmit, (size_t)(sizeof(char) * strlen(g_keypadXmit)))));
assert(ret >= 0); // failure to change the mode should not prevent app from continuing
}
}
extern "C" int32_t SystemNative_UTime(const char* path, UTimBuf* times)
{
assert(times != nullptr);
utimbuf temp;
ConvertUTimBuf(*times, temp);
int32_t result;
while (CheckInterrupted(result = utime(path, &temp)));
return result;
}
extern "C" NetworkChangeKind SystemNative_ReadSingleEvent(int32_t sock)
{
char buffer[4096];
iovec iov = {buffer, sizeof(buffer)};
sockaddr_nl sanl;
msghdr msg = { .msg_name = reinterpret_cast<void*>(&sanl), .msg_namelen = sizeof(sockaddr_nl), .msg_iov = &iov, .msg_iovlen = 1 };
ssize_t len;
while (CheckInterrupted(len = recvmsg(sock, &msg, 0)));
if (len == -1)
{
// Probably means the socket has been closed.
// If so, the managed side will ignore the return value.
return NetworkChangeKind::None;
}
nlmsghdr* hdr = reinterpret_cast<nlmsghdr*>(buffer);
// This channel should only send a single message at a time.
// This means there should be no multi-part messages (NLM_F_MULTI).
assert((hdr->nlmsg_flags & NLM_F_MULTI) == 0);
switch (hdr->nlmsg_type)
{
case NLMSG_DONE:
return NetworkChangeKind::None;
case NLMSG_ERROR:
return NetworkChangeKind::None;
case RTM_NEWADDR:
return NetworkChangeKind::AddressAdded;
case RTM_DELADDR:
return NetworkChangeKind::AddressRemoved;
case RTM_NEWLINK:
return ReadNewLinkMessage(hdr);
case RTM_DELLINK:
return NetworkChangeKind::LinkRemoved;
default:
return NetworkChangeKind::None;
}
}
NetworkChangeKind ReadNewLinkMessage(nlmsghdr* hdr)
{
assert(hdr != nullptr);
ifinfomsg* ifimsg;
ifimsg = reinterpret_cast<ifinfomsg*>(NLMSG_DATA(hdr));
if (ifimsg->ifi_family == AF_INET)
{
if ((ifimsg->ifi_flags & IFF_UP) != 0)
{
return NetworkChangeKind::LinkAdded;
}
}
return NetworkChangeKind::None;
}
extern "C" int32_t SystemNative_FcntlSetPipeSz(intptr_t fd, int32_t size)
{
#ifdef F_SETPIPE_SZ
int32_t result;
while (CheckInterrupted(result = fcntl(ToFileDescriptor(fd), F_SETPIPE_SZ, size)));
return result;
#else
(void)fd, (void)size;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_FStat(intptr_t fd, FileStatus* output)
{
struct stat_ result;
int ret;
while (CheckInterrupted(ret = fstat_(ToFileDescriptor(fd), &result)));
if (ret == 0)
{
ConvertFileStatus(result, output);
}
return ret;
}
extern "C" int32_t SystemNative_ShmUnlink(const char* name)
{
#if HAVE_SHM_OPEN_THAT_WORKS_WELL_ENOUGH_WITH_MMAP
int32_t result;
while (CheckInterrupted(result = shm_unlink(name)));
return result;
#else
// Not supported on e.g. Android. Also, prevent a compiler error because name is unused
(void)name;
errno = ENOTSUP;
return -1;
#endif
}
extern "C" int32_t SystemNative_Stat(const char* path, FileStatus* output)
{
struct stat_ result;
int ret;
while (CheckInterrupted(ret = stat_(path, &result)));
if (ret == 0)
{
ConvertFileStatus(result, output);
}
return ret;
}
extern "C" intptr_t SystemNative_Open(const char* path, int32_t flags, int32_t mode)
{
flags = ConvertOpenFlags(flags);
if (flags == -1)
{
errno = EINVAL;
return -1;
}
int result;
while (CheckInterrupted(result = open(path, flags, static_cast<mode_t>(mode))));
return result;
}
int32_t SystemNative_UTimensat(const char* path, TimeSpec* times)
{
int32_t result;
#if HAVE_UTIMENSAT
struct timespec updatedTimes[2];
updatedTimes[0].tv_sec = (time_t)times[0].tv_sec;
updatedTimes[0].tv_nsec = (long)times[0].tv_nsec;
updatedTimes[1].tv_sec = (time_t)times[1].tv_sec;
updatedTimes[1].tv_nsec = (long)times[1].tv_nsec;
while (CheckInterrupted(result = utimensat(AT_FDCWD, path, updatedTimes, 0)));
#else
struct timeval updatedTimes[2];
updatedTimes[0].tv_sec = (long)times[0].tv_sec;
updatedTimes[0].tv_usec = (int)times[0].tv_nsec / 1000;
updatedTimes[1].tv_sec = (long)times[1].tv_sec;
updatedTimes[1].tv_usec = (int)times[1].tv_nsec / 1000;
while (CheckInterrupted(result = utimes(path, updatedTimes)));
#endif
return result;
}
extern "C" int32_t SystemNative_FTruncate(intptr_t fd, int64_t length)
{
int32_t result;
while (CheckInterrupted(
result =
#if HAVE_FTRUNCATE64
ftruncate64(
#else
ftruncate(
#endif
ToFileDescriptor(fd),
length)));
return result;
}
extern "C" int32_t SystemNative_Pipe(int32_t pipeFds[2], int32_t flags)
{
switch (flags)
{
case 0:
break;
case PAL_O_CLOEXEC:
flags = O_CLOEXEC;
break;
default:
assert(false && "Unknown flag.");
errno = EINVAL;
return -1;
}
int32_t result;
#if HAVE_PIPE2
while (CheckInterrupted(result = pipe2(pipeFds, flags)));
#else
while (CheckInterrupted(result = pipe(pipeFds))); // CLOEXEC intentionally ignored on platforms without pipe2.
#endif
return result;
}
extern "C" int64_t SystemNative_LSeek(intptr_t fd, int64_t offset, SeekWhence whence)
{
int64_t result;
while (CheckInterrupted(
result =
#if HAVE_LSEEK64
lseek64(
#else
lseek(
#endif
ToFileDescriptor(fd),
offset,
whence)));
return result;
}
int32_t SystemNative_ReadStdin(void* buffer, int32_t bufferSize)
{
assert(buffer != NULL || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = EINVAL;
return -1;
}
ssize_t count;
while (CheckInterrupted(count = read(STDIN_FILENO, buffer, Int32ToSizeT(bufferSize))));
return (int32_t)count;
}
extern "C" int32_t SystemNative_ReadStdinUnbuffered(void* buffer, int32_t bufferSize)
{
assert(buffer != nullptr || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = EINVAL;
return -1;
}
ssize_t count;
while (CheckInterrupted(count = read(STDIN_FILENO, buffer, UnsignedCast(bufferSize))));
return static_cast<int32_t>(count);
}
extern "C" int32_t SystemNative_Write(intptr_t fd, const void* buffer, int32_t bufferSize)
{
assert(buffer != nullptr || bufferSize == 0);
assert(bufferSize >= 0);
if (bufferSize < 0)
{
errno = ERANGE;
return -1;
}
ssize_t count;
while (CheckInterrupted(count = write(ToFileDescriptor(fd), buffer, UnsignedCast(bufferSize))));
assert(count >= -1 && count <= bufferSize);
return static_cast<int32_t>(count);
}
extern "C" int32_t SystemNative_LockFileRegion(intptr_t fd, int64_t offset, int64_t length, int16_t lockType)
{
if (offset < 0 || length < 0)
{
errno = EINVAL;
return -1;
}
#if HAVE_FLOCK64
struct flock64 lockArgs;
#else
struct flock lockArgs;
#endif
lockArgs.l_type = lockType;
lockArgs.l_whence = SEEK_SET;
lockArgs.l_start = offset;
lockArgs.l_len = length;
int32_t ret;
while (CheckInterrupted(ret = fcntl (ToFileDescriptor(fd), F_SETLK, &lockArgs)));
return ret;
}
extern "C" int32_t SystemNative_RmDir(const char* path)
{
int32_t result;
while (CheckInterrupted(result = rmdir(path)));
return result;
}
extern "C" int32_t SystemNative_Rename(const char* oldPath, const char* newPath)
{
int32_t result;
while (CheckInterrupted(result = rename(oldPath, newPath)));
return result;
}
extern "C" Error SystemNative_Poll(PollEvent* pollEvents, uint32_t eventCount, int32_t milliseconds, uint32_t* triggered)
{
if (pollEvents == nullptr || triggered == nullptr)
{
return PAL_EFAULT;
}
if (milliseconds < -1)
{
return PAL_EINVAL;
}
size_t bufferSize = sizeof(pollfd) * static_cast<size_t>(eventCount);
bool useStackBuffer = bufferSize <= 2048;
pollfd* pollfds = reinterpret_cast<pollfd*>(useStackBuffer ? alloca(bufferSize) : malloc(bufferSize));
for (uint32_t i = 0; i < eventCount; i++)
{
const PollEvent& event = pollEvents[i];
pollfds[i] = { .fd = event.FileDescriptor, .events = event.Events, .revents = 0 };
}
int rv;
while (CheckInterrupted(rv = poll(pollfds, static_cast<nfds_t>(eventCount), milliseconds)));
if (rv < 0)
{
if (!useStackBuffer)
{
free(pollfds);
}
*triggered = 0;
return SystemNative_ConvertErrorPlatformToPal(errno);
}
for (uint32_t i = 0; i < eventCount; i++)
{
const pollfd& pfd = pollfds[i];
assert(pfd.fd == pollEvents[i].FileDescriptor);
assert(pfd.events == pollEvents[i].Events);
pollEvents[i].TriggeredEvents = static_cast<PollEvents>(pfd.revents);
}
*triggered = static_cast<uint32_t>(rv);
if (!useStackBuffer)
{
free(pollfds);
}
return PAL_SUCCESS;
}
extern "C" int32_t SystemNative_PosixFAdvise(intptr_t fd, int64_t offset, int64_t length, FileAdvice advice)
{
#if HAVE_POSIX_ADVISE
int32_t result;
while (CheckInterrupted(result = posix_fadvise(ToFileDescriptor(fd), offset, length, advice)));
return result;
#else
// Not supported on this platform. Caller can ignore this failure since it's just a hint.
(void)fd, (void)offset, (void)length, (void)advice;
return ENOTSUP;
#endif
}
extern "C" int32_t SystemNative_FTruncate(intptr_t fd, int64_t length)
{
int32_t result;
while (CheckInterrupted(result = ftruncate(ToFileDescriptor(fd), length)));
return result;
}
extern "C" intptr_t SystemNative_MksTemps(char* pathTemplate, int32_t suffixLength)
{
intptr_t result;
while (CheckInterrupted(result = mkstemps(pathTemplate, suffixLength)));
return result;
}
extern "C" int32_t SystemNative_Link(const char* source, const char* linkTarget)
{
int32_t result;
while (CheckInterrupted(result = link(source, linkTarget)));
return result;
}
extern "C" int64_t SystemNative_LSeek(intptr_t fd, int64_t offset, SeekWhence whence)
{
int64_t result;
while (CheckInterrupted(result = lseek(ToFileDescriptor(fd), offset, whence)));
return result;
}
extern "C" int32_t SystemNative_FLock(intptr_t fd, LockOperations operation)
{
int32_t result;
while (CheckInterrupted(result = flock(ToFileDescriptor(fd), operation)));
return result;
}
extern "C" int32_t SystemNative_FSync(intptr_t fd)
{
int32_t result;
while (CheckInterrupted(result = fsync(ToFileDescriptor(fd))));
return result;
}
extern "C" int32_t SystemNative_FChMod(intptr_t fd, int32_t mode)
{
int32_t result;
while (CheckInterrupted(result = fchmod(ToFileDescriptor(fd), static_cast<mode_t>(mode))));
return result;
}
extern "C" int32_t SystemNative_ChMod(const char* path, int32_t mode)
{
int32_t result;
while (CheckInterrupted(result = chmod(path, static_cast<mode_t>(mode))));
return result;
}