io_uring is a (new as of mid 2019) Linux kernel interface to efficiently allow you to send and receive data asynchronously. It was originally designed to target block devices and files but has since gained the ability to work with things like network sockets. Unlike something like epoll(), it is built around a completion model … Read more
GHJUYGHJKLKUJHM;&MJ:6AG9F5D8V)A8%]>75Q;6EE85U955%-245!/3DU,2TI) M2$=&141#0D% /SX]/#LZ.3@W-C4T,S(Q,”\N+2PK*BDH)R8E)”,B(7Y]?’MZ M>7AW=G5T<W)Q<&]N;6QK:FEH9V9E9&-B86!?7EU<6UI96%=655134E%03TY- Untested, but should work.
Here you go: use std::io::Read; use std::mem; use std::slice; #[repr(C, packed)] #[derive(Debug, Copy, Clone)] struct Configuration { item1: u8, item2: u16, item3: i32, item4: [char; 8], } const CONFIG_DATA: &[u8] = &[ 0xfd, // u8 0xb4, 0x50, // u16 0x45, 0xcd, 0x3c, 0x15, // i32 0x71, 0x3c, 0x87, 0xff, // char 0xe8, 0x5d, 0x20, 0xe7, … Read more
The answer by @A.B. is correct, but it tries to conform to OP’s original program structure. I want to have a more readable alternative for newcomers who stumble upon this question (just like I did). use std::env; use std::fs; use std::io::{self, BufReader, BufRead}; fn main() { let input = env::args().nth(1); let reader: Box<dyn BufRead> = … Read more
While vectors don’t support std::io::Read, slices do. There is some confusion here caused by Rust being able to coerce a Vec into a slice in some situations but not others. In this case, an explicit coercion to a slice is needed because at the stage coercions are applied, the compiler doesn’t know that Vec<u8> doesn’t … Read more
O_DIRECT alone only promises that the kernel will avoid copying data from user space to kernel space, and will instead write it directly via DMA (Direct memory access; if possible). Data does not go into caches. There is no strict guarantee that the function will return only after all data has been transferred. O_SYNC guarantees … Read more
It would help to understand the role of 3 important aspects of I/O in computer architecture: Interrupts, DMA, and Hardware Controllers. When the CPU issues an I/O request to the hard disk, the hard disk has its own specialized chip called a device (or hardware) controller designed solely for processing commands from the CPU, such … Read more
If your function accepts an io.Writer, you can pass a *bytes.Buffer to capture the output. // import “bytes” buf := new(bytes.Buffer) f(buf) buf.String() // returns a string of what was written to it If it requires an http.ResponseWriter, you can use a *httptest.ResponseRecorder. A response recorder holds all information that can be sent to a … Read more