Silence ECANCELED and ENOENT.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cijail"
-version = "0.6.7"
+version = "0.6.8"
 edition = "2021"
 publish = false
 

ci/Dockerfile

@@ -3,8 +3,6 @@ FROM alpine:latest AS alpine
 RUN apk add linux-headers
 
 FROM rust:1.76.0
-# NB: We need debian stable to have the oldest possible glibc
-# otherwise cijail may not work on old distributions.
 
 # Get proper linux headers for libseccomp.
 COPY --from=alpine /usr/include /usr/include/alpine

src/bin/cijail/tracer.rs

@@ -23,6 +23,7 @@ use cijail::EndpointSet;
 use cijail::CIJAIL_ENDPOINTS;
 use cijail::CIJAIL_PROXY_PID;
 use libc::AT_FDCWD;
+use libseccomp::error::SeccompErrno;
 use libseccomp::error::SeccompError;
 use libseccomp::notify_id_valid;
 use libseccomp::ScmpNotifReq;
@@ -61,7 +62,12 @@ pub(crate) fn main(
             &mut mutable_context,
         ) {
             Err(LoopError::Continue(e)) => {
-                error!("continue after seccomp error: {}", e);
+                if !matches!(
+                    e.errno(),
+                    Some(SeccompErrno::ECANCELED) | Some(SeccompErrno::ENOENT)
+                ) {
+                    error!("continue after seccomp error: {}", e);
+                }
             }
             Err(LoopError::Break(e)) => {
                 return Err(e);