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Fixup write_gather (Linux, BSD)

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Split iovec into small portions (256 for now)
This commit is contained in:
Nekotekina 2021-03-09 14:02:07 +03:00
parent 19b5b47b26
commit a6350d5dd1
1 changed files with 13 additions and 4 deletions
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17
Utilities/File.cpp
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@ -1301,10 +1301,19 @@ fs::file::file(const std::string& path, bs_t<open_mode> mode)
static_assert(sizeof(iovec) == sizeof(iovec_clone), "Weird iovec size");
static_assert(offsetof(iovec, iov_len) == offsetof(iovec_clone, iov_len), "Weird iovec::iov_len offset");
iovec arg;
std::memcpy(&arg, buffers, sizeof(arg));
const auto result = ::writev(m_fd, &arg, buf_count);
ensure(result != -1); // "file::write_gather"
u64 result = 0;
while (buf_count)
{
iovec arg[256];
const auto count = std::min<u64>(buf_count, 256);
std::memcpy(&arg, buffers, sizeof(iovec) * count);
const auto added = ::writev(m_fd, arg, count);
ensure(added != -1); // "file::write_gather"
result += added;
buf_count -= count;
buffers += count;
}
return result;
}