std: fix readdir errors for solaris
#34776
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The `use ffi::CStr` in `unix/thread.rs` was previously guarded, but now all platforms need it for `Thread::set_name()`. Newlib and Solaris do nothing here, as they have no way to set a thread name, but they still define the same method signature.
Like BSDs, Solaris maps `IPV6_ADD_MEMBERSHIP` and `IPV6_DROP_MEMBERSHIP` from `IPV6_JOIN_GROUP` and `IPV6_LEAVE_GROUP` respectively.
A `NULL` from `readdir` could be the end of stream or an error. The only way to know is to check `errno`, so it must be set to a known value first, like a 0 that POSIX will never use. This patch adds `set_errno`, uses it to clear the value before calling `readdir`, then checks it again after to see the reason for a `NULL`.
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std: fix `readdir` errors for solaris A `NULL` from `readdir` could be the end of stream or an error. The only way to know is to check `errno`, so it must be set to a known value first, like a 0 that POSIX will never use. This currently only matters for solaris targets, as the other unix platforms are using `readdir_r` with a direct error return indication. However, this is getting deprecated (#34668) so they should all eventually switch to `readdir`. This PR adds `set_errno`, uses it to clear the value before calling `readdir`, then checks it again after to see the reason for a `NULL`. A few other small fixes are included just to get solaris compiling at all. I couldn't get cross-compilation completely going, so I don't have a good way to test this beyond a smoke-test cargo build of std. I'd appreciate input from someone more familiar with solaris -- cc @nbaksalyar?
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A
NULLfromreaddircould be the end of stream or an error. The onlyway to know is to check
errno, so it must be set to a known value first,like a 0 that POSIX will never use.
This currently only matters for solaris targets, as the other unix platforms
are using
readdir_rwith a direct error return indication. However, this isgetting deprecated (#34668) so they should all eventually switch to
readdir.This PR adds
set_errno, uses it to clear the value before callingreaddir,then checks it again after to see the reason for a
NULL. A few other smallfixes are included just to get solaris compiling at all.
I couldn't get cross-compilation completely going, so I don't have a good way
to test this beyond a smoke-test cargo build of std. I'd appreciate input from
someone more familiar with solaris -- cc @nbaksalyar?