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Replace nix pipe/splice/vmsplice wrappers with rustix equivalents
in uucore's pipes module. Also migrate cat's splice.rs to use
rustix::io::{read, write} instead of nix::unistd.
The return types change from nix::Result to std::io::Result, which
is more idiomatic and compatible with the broader ecosystem.
Replace nix process functions with rustix equivalents: - geteuid/getegid/getuid/getgid/getpid/getpgrp/getsid -> rustix::process - kill/test_kill -> rustix::process::kill_process/test_kill_process - Signal::try_from -> signal_from_raw helper using from_raw_unchecked - SigHandler for send_signal_group -> csignal wrapper The getsid return type changes from Result<pid_t, Errno> to io::Result<pid_t>, which is more idiomatic.
Replace all nix APIs with rustix equivalents in the security-critical
TOCTOU-safe filesystem traversal module:
- nix::dir::Dir -> rustix::fs::Dir (uses Dir::read_from which borrows fd)
- nix::fcntl::{OFlag, openat} -> rustix::fs::{OFlags, openat}
- nix::sys::stat::{fstat, fstatat, fchmod, fchmodat, mkdirat} -> rustix::fs
- nix::unistd::{fchown, fchownat, unlinkat} -> rustix::fs
- FchmodatFlags/UnlinkatFlags -> rustix::fs::AtFlags
- Error handling simplified: rustix Errno implements Into<io::Error>
Also update rm's unix platform code to use the new Stat type.
All 31 safe_traversal unit tests pass.
Replace all nix signal and poll APIs in uucore: - signals.rs: nix::sys::signal -> csignal wrappers - signals.rs: nix::poll -> rustix::event::poll - signals.rs: nix::sys::stat -> rustix::fs::fstat + libc constants - lib.rs: nix sigaction -> csignal::set_signal_action - dd/progress.rs: update install_sigusr1_handler to use libc::SIGUSR1 Return types change from nix::Result/Errno to std::io::Result.
Migrate 19 utility crates from nix to rustix and direct libc calls: - kill, timeout, env: signal handling via csignal wrappers + libc - sync, cat, tail, dd, tsort: file operations via rustix::fs - touch: futimens via rustix::fs::futimens - stty, tty: terminal ops via rustix::termios + libc ioctl - sort: getrlimit via rustix::process, sysconf via libc - wc, cp, df: stat/fstat via rustix::fs - nice: priority via rustix::process - mkfifo, mknod: via direct libc calls Also add rustix::io::Errno conversions to uucore error.rs.
- Remove nix dependency from uucore Cargo.toml - Remove nix error conversion impls from error.rs, replace with rustix - Migrate date's clock_settime/clock_getres from nix to rustix::time - Replace nix dependency with rustix in date's Cargo.toml - Update test nix features for test utilities that still need it The nix crate is now completely removed from all source code (src/). It remains only as a dev-dependency for test code.
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