RDKEMW-21888 : Fix coverity issues (from copilot) in subttxrend-app

[krithikasvraman]

Reason for change: Fix coverity issues in subttxrend-app
Test Procedure: Regression tests
Risks: Low
Signed-off-by:krithika_venkataraman@comcast.com

[Copilot]

Pull request overview

This PR targets Coverity/static-analysis findings in subttxrend-app by simplifying log-level string mapping and refactoring the termination-signal listener setup in main().

Changes:

• Reworked levelToString() to avoid runtime-initialized container state by using static names + switch/checks.
• Split signal handling into blockTerminationSignals() and createSignalListener() to make threading/signal masking flow clearer.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
subttxrend-app/x86_builder/src/rdklogger/src/logger.cpp	Replaces lazy-initialized map-based log-level lookup with static strings and explicit branching.
subttxrend-app/src/main.cpp	Refactors signal masking and async signal waiting into two helper functions used by main().

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[krithikasvraman]

fixed in next commit

[krithikasvraman]

fixed in next commit

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

subttxrend-app/src/main.cpp:38

• blockTerminationSignals() returns false on failure but doesn't record which specific POSIX call failed (sigemptyset/sigaddset/pthread_sigmask). That makes the subsequent "Failed to block termination signals" message hard to act on when it occurs. Consider emitting a more specific error message at the point of failure (even if you don’t include strerror/errno).

static bool blockTerminationSignals(sigset_t& sigset)
{
    if (sigemptyset(&sigset) != 0) {
        return false;
    }