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Kernel: Make UserOrKernelBuffer R/W helpers return KResultOr<size_t>

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This makes error propagation less cumbersome (and also exposed some
places where we were not doing it.)
This commit is contained in:
Andreas Kling 2021-05-13 09:08:44 +02:00
parent 25a45e639a
commit e46343bf9a
15 changed files with 64 additions and 85 deletions
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9
Kernel/Syscalls/debug.cpp
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@ -23,7 +23,7 @@ KResultOr<int> Process::sys$dbgputch(u8 ch)
return 0;
}
KResultOr<int> Process::sys$dbgputstr(Userspace<const u8*> characters, int length)
KResultOr<size_t> Process::sys$dbgputstr(Userspace<const u8*> characters, int length)
{
if (length <= 0)
return 0;
@ -31,14 +31,11 @@ KResultOr<int> Process::sys$dbgputstr(Userspace<const u8*> characters, int lengt
auto buffer = UserOrKernelBuffer::for_user_buffer(characters, length);
if (!buffer.has_value())
return EFAULT;
ssize_t nread = buffer.value().read_buffered<1024>(length, [&](const u8* buffer, size_t buffer_size) {
return buffer.value().read_buffered<1024>(length, [&](u8 const* buffer, size_t buffer_size) {
for (size_t i = 0; i < buffer_size; ++i)
IO::out8(0xe9, buffer[i]);
return (ssize_t)buffer_size;
return buffer_size;
});
if (nread < 0)
return (int)nread;
return 0;
}
}

7
Kernel/Syscalls/getrandom.cpp
View file

@ -13,7 +13,7 @@ namespace Kernel {
// We don't use the flag yet, but we could use it for distinguishing
// random source like Linux, unlike the OpenBSD equivalent. However, if we
// do, we should be able of the caveats that Linux has dealt with.
KResultOr<ssize_t> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
KResultOr<size_t> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer_size, [[maybe_unused]] unsigned flags)
{
REQUIRE_PROMISE(stdio);
if (buffer_size <= 0)
@ -22,11 +22,10 @@ KResultOr<ssize_t> Process::sys$getrandom(Userspace<void*> buffer, size_t buffer
auto data_buffer = UserOrKernelBuffer::for_user_buffer(buffer, buffer_size);
if (!data_buffer.has_value())
return EFAULT;
ssize_t nwritten = data_buffer.value().write_buffered<1024>(buffer_size, [&](u8* buffer, size_t buffer_bytes) {
return data_buffer.value().write_buffered<1024>(buffer_size, [&](u8* buffer, size_t buffer_bytes) {
get_good_random_bytes(buffer, buffer_bytes);
return (ssize_t)buffer_bytes;
return buffer_bytes;
});
return nwritten;
}
}