fix: handle termination signals properly

[18202781743]

Removed signal handlers for SIGSEGV, SIGILL, SIGABRT, and SIGFPE which
are typically fatal signals that should not be caught and handled by
applications. Added proper signal handling for SIGTERM and SIGINT which
are termination signals that applications should gracefully handle
for proper shutdown procedures. This ensures the daemon can respond to
system termination requests and user interrupt signals correctly.

fix: 正确处理终止信号

移除了对SIGSEGV、SIGILL、SIGABRT和SIGFPE的信号处理程序，这些通常是致命信
号，不应由应用程序捕获和处理。添加了对SIGTERM和SIGINT的适当信号处理，这
些是终止信号，应用程序应优雅处理以实现正确的关闭流程。这确保守护程序能够
正确响应系统终止请求和用户中断信号。

Summary by Sourcery

Refine signal handling to remove fatal signal handlers and implement proper handling of termination signals for graceful shutdown.

Bug Fixes:

• Remove handlers for fatal signals (SIGSEGV, SIGILL, SIGABRT, SIGFPE) which should not be caught.
• Add handlers for termination signals (SIGTERM, SIGINT) to support graceful shutdown of the daemon.

[deepin-ci-robot]

deepin pr auto review

我对这段代码的变更进行审查，主要关注以下几个方面：

1. 语法逻辑：

• 代码语法正确，没有语法错误。
• 修改将信号处理从(SIGSEGV, SIGILL, SIGABRT, SIGFPE)更改为(SIGTERM, SIGINT)。

2. 代码质量：

• 原代码处理的是严重错误信号(SIGSEGV, SIGILL, SIGABRT, SIGFPE)，这些信号通常表示程序遇到了严重错误。
• 新代码处理的是终止信号(SIGTERM)和中断信号(SIGINT)，这些是正常的程序终止信号。
• 这种变更可能会影响程序的错误处理能力，因为严重错误信号不再被捕获和处理。

3. 代码性能：

• 信号处理本身对性能影响很小，这次变更不会明显影响性能。

4. 代码安全：

• 移除对严重错误信号的处理可能会降低程序的稳定性，因为这些信号发生时程序可能会直接崩溃，而没有适当的清理或错误报告机制。
• SIGTERM和SIGINT是正常的终止信号，处理它们是合理的，但不应完全替代对严重错误信号的处理。

改进建议：

1. 如果确实需要更改信号处理，建议保留对严重错误信号的处理，同时添加对SIGTERM和SIGINT的处理：

sigaction(SIGSEGV, &sa, nullptr);
sigaction(SIGILL, &sa, nullptr);
sigaction(SIGABRT, &sa, nullptr);
sigaction(SIGFPE, &sa, nullptr);
sigaction(SIGTERM, &sa, nullptr);
sigaction(SIGINT, &sa, nullptr);

2. 或者，至少保留对SIGABRT的处理，因为它通常用于程序主动终止，可能需要执行清理操作：

sigaction(SIGABRT, &sa, nullptr);
sigaction(SIGTERM, &sa, nullptr);
sigaction(SIGINT, &sa, nullptr);

3. 确保信号处理函数(&sa)实现了适当的错误处理和清理逻辑，而不是简单地终止程序。

总结：这次变更可能会降低程序的健壮性，因为它移除对严重错误信号的处理。建议重新评估是否需要完全移除这些信号处理，或者至少保留对关键错误信号的处理。

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This change updates the signal handling logic in main.cpp by removing handlers for fatal signals (SIGSEGV, SIGILL, SIGABRT, SIGFPE) and introducing handlers for SIGTERM and SIGINT to enable graceful shutdown of the daemon.

Sequence diagram for updated signal handling during daemon shutdown

sequenceDiagram
    participant OS
    participant Daemon
    OS->>Daemon: Send SIGTERM or SIGINT
    Daemon->>Daemon: Handle signal (graceful shutdown)
    Daemon->>OS: Exit cleanly

Loading

Class diagram for main signal handling logic update

classDiagram
    class Main {
        +sigaction(SIGTERM)
        +sigaction(SIGINT)
        -sigaction(SIGSEGV)
        -sigaction(SIGILL)
        -sigaction(SIGABRT)
        -sigaction(SIGFPE)
    }

Loading

File-Level Changes

Change	Details	Files
Remove handling for fatal signals	Removed sigaction setup for SIGSEGV, SIGILL, SIGABRT, and SIGFPE	dconfig-center/dde-dconfig-daemon/main.cpp
Add handling for termination signals	Configured sigaction for SIGTERM and SIGINT for graceful shutdown	dconfig-center/dde-dconfig-daemon/main.cpp

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, mhduiy

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