| @@ -2,7 +2,7 @@ |
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use super::hermit_abi; |
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use crate::cmp; |
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-use crate::io::{self, IoSlice, IoSliceMut, Read, SeekFrom}; |
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+use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, Read, SeekFrom}; |
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use crate::os::hermit::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd, RawFd}; |
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use crate::sys::{cvt, unsupported}; |
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use crate::sys_common::{AsInner, FromInner, IntoInner}; |
| @@ -23,6 +23,21 @@ impl FileDesc { |
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Ok(result as usize) |
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} |
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+pub fn read_buf(&self, mut buf: BorrowedCursor<'_>) -> io::Result<()> { |
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+// SAFETY: The `read` syscall does not read from the buffer, so it is |
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+// safe to use `&mut [MaybeUninit]`. |
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+let result = cvt(unsafe { |
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+ hermit_abi::read( |
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+self.fd.as_raw_fd(), |
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+ buf.as_mut().as_mut_ptr() as *mut u8, |
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+ buf.capacity(), |
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+) |
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+})?; |
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+// SAFETY: Exactly `result` bytes have been filled. |
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+unsafe { buf.advance_unchecked(result as usize) }; |
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+Ok(()) |
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+} |
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+ |
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pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> { |
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let ret = cvt(unsafe { |
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hermit_abi::readv( |