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Original file line number | Diff line number | Diff line change |
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use std::{ | ||
ffi::{CString, OsString}, | ||
fs::{self}, | ||
os::unix::prelude::OsStrExt, | ||
path::PathBuf, | ||
}; | ||
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use crate::ProcResult; | ||
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use super::Process; | ||
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impl Process { | ||
/// Describes namespaces to which the process with the corresponding PID belongs. | ||
/// Doc reference: https://man7.org/linux/man-pages/man7/namespaces.7.html | ||
pub fn namespaces(&self) -> ProcResult<Vec<Namespace>> { | ||
let ns = self.root.join("ns"); | ||
let mut namespaces = Vec::new(); | ||
for entry in fs::read_dir(ns)? { | ||
let entry = entry?; | ||
let path = entry.path(); | ||
let ns_type = entry.file_name(); | ||
let cstr = CString::new(path.as_os_str().as_bytes()).unwrap(); | ||
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let mut stat = unsafe { std::mem::zeroed() }; | ||
if unsafe { libc::stat(cstr.as_ptr(), &mut stat) } != 0 { | ||
return Err(build_internal_error!(format!("Unable to stat {:?}", path))); | ||
} | ||
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namespaces.push(Namespace { | ||
ns_type, | ||
path, | ||
identifier: stat.st_ino, | ||
device_id: stat.st_dev, | ||
}) | ||
} | ||
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Ok(namespaces) | ||
} | ||
} | ||
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/// Information about a namespace | ||
/// | ||
/// See also the [Process::namespaces()] method | ||
#[derive(Debug, Clone)] | ||
pub struct Namespace { | ||
/// Namespace type | ||
pub ns_type: OsString, | ||
/// Handle to the namespace | ||
pub path: PathBuf, | ||
/// Namespace identifier (inode number) | ||
pub identifier: u64, | ||
/// Device id of the namespace | ||
pub device_id: u64, | ||
} | ||
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impl PartialEq for Namespace { | ||
fn eq(&self, other: &Self) -> bool { | ||
// see https://lore.kernel.org/lkml/87poky5ca9.fsf@xmission.com/ | ||
self.identifier == other.identifier && self.device_id == other.device_id | ||
} | ||
} | ||
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impl Eq for Namespace {} | ||
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#[cfg(test)] | ||
mod tests { | ||
use crate::process::Process; | ||
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#[test] | ||
fn test_namespaces() { | ||
let myself = Process::myself().unwrap(); | ||
let namespaces = myself.namespaces().unwrap(); | ||
print!("{:?}", namespaces); | ||
} | ||
} |
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