Fix ACE_Logging_Strategy::handle_timeout returning -1 without releasing ACE_Log_Msg lock

[likema]

Before changed, there were two snippets in ACE_Logging_Strategy::handle_timeout :

if (output_file == 0)
        return -1;

whiich would return without releasing ACE_Log_Msg lock

Summary by CodeRabbit

• Bug Fixes
  • Improved thread safety in logging mechanism
  • Added null-check before closing output file
  • Enhanced resource management for logging strategy
  • Streamlined file operations for clarity and reduced error-proneness
• New Features
  • Updated member variable initializations for improved safety and clarity.

[jwillemsen]

Don’t force push, makes it harder to review, use nullptr instead of 0

[likema]

Don’t force push, makes it harder to review, use nullptr instead of 0

OK. Shall I combine two commits into one after reviewed so that keep one issue per commit?

[jwillemsen]

No need to squash, please add/extend a unit test as reproducer

[coderabbitai]

Walkthrough

The changes in the Logging_Strategy.cpp and Logging_Strategy.h files focus on enhancing code clarity and safety. Key modifications include initializing variables with empty initializers, updating pointer initializations from 0 to nullptr, and improving error handling in the handle_timeout method with ACE_GUARD_RETURN. Additionally, member variables in the header file have been assigned default initial values to prevent undefined behavior. These adjustments aim to create a more maintainable and robust logging strategy implementation.

Changes

File	Change Summary
ACE/ace/Logging_Strategy.cpp	- Updated priorities and tokenize methods to initialize strtokp with {} - Changed pointer initializations from 0 to nullptr for filename_, logger_key_, and program_name_ - Replaced direct lock management with ACE_GUARD_RETURN in handle_timeout - Added null checks before closing output files - Set reactor to nullptr in fini method
ACE/ace/Logging_Strategy.h	- Initialized member variables with default values, including thread_priority_mask_, process_priority_mask_, flags_, and others to prevent undefined behavior

Possibly related PRs

• Reset FILE* Log_Msg::ostream_ #2258: The changes in the main PR and the retrieved PR both involve updating pointer initializations from 0 to nullptr, indicating a direct relationship in their modifications to improve code clarity and safety regarding pointer handling.

Poem

🐰 A Logging Tale of Thread-Safe Grace 🔒

In ACE's realm, a guard now stands tall,
Protecting threads from lock's risky sprawl.
Null checks dance, resources clean,
Safety woven, a coder's dream!

Hop, hop, hurrah for thread-safe might! 🚀

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between cbd72dc and e1db79f.

📒 Files selected for processing (2)

• ACE/ace/Logging_Strategy.cpp (18 hunks)
• ACE/ace/Logging_Strategy.h (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• ACE/ace/Logging_Strategy.cpp

⏰ Context from checks skipped due to timeout of 90000ms (19)

• GitHub Check: ubuntu-20.04 g++-10 ACE for TAO
• GitHub Check: ubuntu-20.04 clang++-12
• GitHub Check: ubuntu-20.04 clang++-11
• GitHub Check: ubuntu-20.04 clang++-10
• GitHub Check: VS2022Release64
• GitHub Check: VS2022Debug64
• GitHub Check: VS2022WChar
• GitHub Check: VS2019Debug64Cxx20
• GitHub Check: VS2019Debug64Cxx17
• GitHub Check: VS2019Release32
• GitHub Check: VS2019Debug32
• GitHub Check: VS2019Release64
• GitHub Check: VS2019Debug64
• GitHub Check: VS2019WChar
• GitHub Check: MINGW64-gcc
• GitHub Check: alpine-3.18
• GitHub Check: windows-2019 vs2019
• GitHub Check: ubuntu-22.04 g++-12
• GitHub Check: ubuntu-20.04 g++-10

🔇 Additional comments (4)

ACE/ace/Logging_Strategy.h (4)

164-164: LGTM: Good use of zero-initialization for pointers.

The initialization of pointer members to {} (which zero-initializes to nullptr) follows modern C++ practices and prevents undefined behavior from uninitialized pointers.

Also applies to: 167-167, 170-170

---

174-174: LGTM: Boolean flags properly initialized to documented defaults.

The initialization of boolean members to {} (which zero-initializes to false) matches the documented default values in the comments and prevents undefined behavior.

Also applies to: 178-178, 182-182

---

155-155: LGTM: Numeric values properly initialized with appropriate defaults.

The initialization of numeric members follows best practices:

• Zero-initialization with {} for members without specific defaults
• Explicit initialization to documented default values where applicable
• Good use of the ACE_DEFAULT_LOGFILE_POLL_INTERVAL constant

Also applies to: 158-158, 161-161, 186-186, 191-191, 196-196, 200-200

---

155-200: Note: Member initializations improve safety but don't directly address the locking issue.

While these initializations are valuable improvements that prevent undefined behavior, they don't directly address the PR's main objective of fixing the lock release issue in handle_timeout. Please ensure the corresponding changes in the implementation file properly handle the lock release.

✅ Verification successful

Lock Handling in handle_timeout Verified

The handle_timeout implementation now properly uses ACE_GUARD_RETURN to acquire and automatically release the lock, addressing the issue of potentially returning -1 without releasing the lock.

• The use of ACE_GUARD_RETURN in ACE_Logging_Strategy::handle_timeout ensures proper lock release via RAII.
• The member initializations in the header improve safety but do not directly influence the locking mechanism.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Look for the handle_timeout implementation to verify lock handling
ast-grep --pattern $'ACE_Logging_Strategy::handle_timeout($_, $_) {
  $$$
}'

Length of output: 248

---

Script:

#!/bin/bash
# Locate the implementation file for ACE_Logging_Strategy
fd -HI "Logging_Strategy.cpp" || true

# If the implementation file is found, search for the handle_timeout function definition with context.
if [ -f ACE/ace/Logging_Strategy.cpp ]; then
    echo "Searching for handle_timeout in ACE/ace/Logging_Strategy.cpp"
    rg -C 10 "handle_timeout" ACE/ace/Logging_Strategy.cpp
else
    echo "ACE/ace/Logging_Strategy.cpp not found. Searching for handle_timeout in all ACE/ace files..."
    rg -C 10 "handle_timeout" ACE/ace/
fi

Length of output: 2406

---

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

ACE/ace/Logging_Strategy.cpp (1)

445-449: Consider checking the return code from ACE_OS::fclose.
By silently ignoring potential errors, you may miss critical flush or close failures. For example, you could log an error or return a failure status:

-ACE_OS::fclose (output_file);
+if (ACE_OS::fclose (output_file) != 0)
+  {
+    ACELIB_ERROR ((LM_ERROR, ACE_TEXT ("Failed to close output file\n")));
+    return -1;
+  }

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b5f10b5 and b15bb02.

📒 Files selected for processing (1)

• ACE/ace/Logging_Strategy.cpp (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Codacy Static Code Analysis

🔇 Additional comments (1)

ACE/ace/Logging_Strategy.cpp (1)

436-437: Good use of ACE_Guard to ensure lock release.
This approach prevents the function from returning prematurely without unlocking, reducing the risk of deadlocks.