55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
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use anyhow::{bail, Result};
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use nix_c_raw as raw;
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use std::ptr::null_mut;
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use std::ptr::NonNull;
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pub struct Context {
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inner: NonNull<raw::nix_c_context>,
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}
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impl Context {
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pub fn new() -> Self {
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let ctx = unsafe { raw::nix_c_context_create() };
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if ctx.is_null() {
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panic!("nix_c_context_create returned a null pointer");
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}
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let ctx = Context {
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inner: NonNull::new(ctx).unwrap(),
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};
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ctx
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}
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pub fn ptr(&self) -> *mut raw::nix_c_context {
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self.inner.as_ptr()
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}
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pub fn check_err(&self) -> Result<()> {
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let err = unsafe { raw::nix_err_code(self.inner.as_ptr()) };
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if err != raw::NIX_OK.try_into().unwrap() {
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// msgp is a borrowed pointer, so we don't need to free it
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let msgp = unsafe { raw::nix_err_msg(null_mut(), self.inner.as_ptr(), null_mut()) };
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// Turn the i8 pointer into a Rust string by copying
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let msg: &str = unsafe { core::ffi::CStr::from_ptr(msgp).to_str()? };
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bail!("{}", msg);
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}
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Ok(())
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}
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}
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impl Drop for Context {
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fn drop(&mut self) {
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unsafe {
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raw::nix_c_context_free(self.inner.as_ptr());
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn context_new_and_drop() {
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// don't crash
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let _c = Context::new();
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}
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}
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