diff --git a/src/uu/renice/Cargo.toml b/src/uu/renice/Cargo.toml new file mode 100644 index 0000000..a3145bd --- /dev/null +++ b/src/uu/renice/Cargo.toml @@ -0,0 +1,13 @@ +[package] +name = "uu_renice" +version = "0.0.1" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +libc = { workspace = true } + +[[bin]] +name = "renice" +path = "src/renice.rs" diff --git a/src/uu/renice/src/renice.rs b/src/uu/renice/src/renice.rs new file mode 100644 index 0000000..1a81e26 --- /dev/null +++ b/src/uu/renice/src/renice.rs @@ -0,0 +1,34 @@ + use std::env; + use std::process; + use std::str::FromStr; +use libc::{c_char, c_int, execvp, PRIO_PROCESS}; +use std::io::{Error, Write}; + + + fn main() { + let args: Vec<String> = env::args().collect(); + + if args.len() != 3 { + eprintln!("Usage: renice <nice value> <pid>"); + process::exit(1); + } + + let nice_value = i32::from_str(&args[1]).unwrap_or_else(|_| { + eprintln!("Invalid nice value"); + process::exit(1); + }); + + let pid = i32::from_str(&args[2]).unwrap_or_else(|_| { + eprintln!("Invalid PID"); + process::exit(1); + }); + + if unsafe { libc::setpriority(PRIO_PROCESS, pid.try_into().unwrap(), nice_value) } == -1 { + eprintln!("Failed to set nice value: {}", Error::last_os_error()); + process::exit(1); + } + + println!("Nice value of process {} set to {}", pid, nice_value); + +} +