zhangtianci,

>POSIX's require on fdopen:
>
>     The application shall ensure that the mode of the stream as
> expressed by the mode argument is allowed by the file access mode of
> the open file description to which fildes refers.
>
>So I think the example above should return EINVAL.

No, the "application" is the user code, so this is a requirement for
you, not musl.

Otherwise it would say "The *implementation* shall ensure …"

Jens

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