fix:886-bug-report命名管道读行为不符合posix规范问题

[xiaolin2004]

测试结果：
期望情况
非阻塞模式下

========== Testing Nonblocking Mode ==========

--- Testing: No readers (FIFO never had readers) (nonblocking=1) ---
Result: Failed to open FIFO for writing (ENXIO: No readers).

--- Testing: Reader exists but disconnects (nonblocking=1) ---
Result: Write failed with EPIPE (no readers available).

--- Testing: Active reader exists (nonblocking=1) ---
Result: Write succeeded. Bytes written: 13

阻塞模式下

========== Testing Blocking Mode ==========

--- Testing: No readers (FIFO never had readers) (nonblocking=0) ---
Result: Failed to open FIFO for writing (ENXIO: No readers).

--- Testing: Reader exists but disconnects (nonblocking=0) ---
Result: Write failed with EPIPE (no readers available).

--- Testing: Active reader exists (nonblocking=0) ---
Result: Write succeeded. Bytes written: 13

测试结果（截图）

[dragonosbot]

@xiaolin2004: no appropriate reviewer found, use r? to override

[xiaolin2004]

close due to name change of branch