dongjiuzhu1 e86f6c12a5 system/popen: support r+, w+ mode
The standard popen uses the pipeline internally, so the stream
returned by it can only support read-only or write-only.
Now this patch is expanded through sockpair, which can support both
read and write. Therefore, we can use the stream to read and write
access this task (posix_spawn start).

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
2023-07-29 20:29:54 -07:00
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