From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001 From: Valentin Popov Date: Mon, 8 Jan 2024 01:21:28 +0400 Subject: Initial vendor packages Signed-off-by: Valentin Popov --- .../rustix/src/backend/linux_raw/shm/syscalls.rs | 47 ++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 vendor/rustix/src/backend/linux_raw/shm/syscalls.rs (limited to 'vendor/rustix/src/backend/linux_raw/shm/syscalls.rs') diff --git a/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs b/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs new file mode 100644 index 0000000..3b083f4 --- /dev/null +++ b/vendor/rustix/src/backend/linux_raw/shm/syscalls.rs @@ -0,0 +1,47 @@ +use crate::ffi::CStr; + +use crate::backend::fs::syscalls::{open, unlink}; +use crate::backend::fs::types::{Mode, OFlags}; +use crate::fd::OwnedFd; +use crate::io; +use crate::shm::ShmOFlags; + +const NAME_MAX: usize = 255; +const SHM_DIR: &[u8] = b"/dev/shm/"; + +fn get_shm_name(name: &CStr) -> io::Result<([u8; NAME_MAX + SHM_DIR.len() + 1], usize)> { + let name = name.to_bytes(); + + if name.len() > NAME_MAX { + return Err(io::Errno::NAMETOOLONG); + } + + let num_slashes = name.iter().take_while(|x| **x == b'/').count(); + let after_slashes = &name[num_slashes..]; + if after_slashes.is_empty() + || after_slashes == b"." + || after_slashes == b".." + || after_slashes.contains(&b'/') + { + return Err(io::Errno::INVAL); + } + + let mut path = [0; NAME_MAX + SHM_DIR.len() + 1]; + path[..SHM_DIR.len()].copy_from_slice(SHM_DIR); + path[SHM_DIR.len()..SHM_DIR.len() + name.len()].copy_from_slice(name); + Ok((path, SHM_DIR.len() + name.len() + 1)) +} + +pub(crate) fn shm_open(name: &CStr, oflags: ShmOFlags, mode: Mode) -> io::Result { + let (path, len) = get_shm_name(name)?; + open( + CStr::from_bytes_with_nul(&path[..len]).unwrap(), + OFlags::from_bits(oflags.bits()).unwrap() | OFlags::CLOEXEC, + mode, + ) +} + +pub(crate) fn shm_unlink(name: &CStr) -> io::Result<()> { + let (path, len) = get_shm_name(name)?; + unlink(CStr::from_bytes_with_nul(&path[..len]).unwrap()) +} -- cgit v1.2.3