python - select 返回管道可读，读时却报 EAGAIN 错，是怎么回事呢？

Answer 1

After reading your description, I guess it may be caused by insufficient resources. Is it because the program has been used for a long time and too many child processes have been created, reaching the resource usage limit? Then killed by the system, resulting in the number of Resource temporarily unavailable 可以看一下你机器下ps aux| wc -l运行的进程数，然后看看机器的ulimit -u. If the number is infinitely close to or exceeds the ulimit, a Resource temporarily unavailable problem may occur. This is my guess, I hope it helps you