chore(crashtracking): preserve errno for crashtracker

libdd-crashtracker/Cargo.toml

@@ -48,6 +48,7 @@ libdd-libunwind-sys = { version = "0.1.0", path = "../libdd-libunwind-sys" }
 anyhow = "1.0"
 chrono = {version = "0.4", default-features = false, features = ["std", "clock", "serde"]}
 cxx = { version = "1.0", optional = true }
+errno = "0.3"
 libdd-common = { version = "3.0.0", path = "../libdd-common" }
 libdd-telemetry = { version = "3.0.0", path = "../libdd-telemetry" }
 http = "1.1"

libdd-crashtracker/src/collector/crash_handler.rs

@@ -9,6 +9,7 @@ use super::signal_handler_manager::chain_signal_handler;
 use crate::crash_info::Metadata;
 use crate::shared::configuration::CrashtrackerConfiguration;
 use crate::StackTrace;
+use errno::{errno, set_errno};
 use libc::{c_void, siginfo_t, ucontext_t};
 use libdd_common::timeout::TimeoutManager;
 use std::os::fd::OwnedFd;
@@ -193,10 +194,17 @@ pub(crate) extern "C" fn handle_posix_sigaction(
     sig_info: *mut siginfo_t,
     ucontext: *mut c_void,
 ) {
+    // Save errno
+    let errno = errno();
+
     // Handle the signal.  Note this has a guard to ensure that we only generate
     // one crash report per process.
     let _ = handle_posix_signal_impl(sig_info, ucontext as *mut ucontext_t);
+
+    // Restore errno
+    set_errno(errno);
     // SAFETY: No preconditions.
+
     unsafe { chain_signal_handler(signum, sig_info, ucontext) };
 }