freebsd: call dlerror() only if necessary (#3388)

Similar to the dlopen() codepath.

Refs: https://github.com/JuliaLang/julia/pull/40392
Refs: https://github.com/JuliaLang/julia/

freebsd: call dlerror() only if necessary (#3388)

Similar to the dlopen() codepath.

Refs: https://github.com/JuliaLang/julia/pull/40392
Refs: https://github.com/JuliaLang/julia/issues/39582

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misc: remove unnecessary null pointer checks

Fixes: https://github.com/libuv/libuv/issues/595
PR-URL: https://github.com/libuv/libuv/pull/604
Reviewed-By: Saúl Ibarra Corretgé <saghu

misc: remove unnecessary null pointer checks

Fixes: https://github.com/libuv/libuv/issues/595
PR-URL: https://github.com/libuv/libuv/pull/604
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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core: add ability to customize memory allocator

This patch is composed by the work done in
https://github.com/libuv/libuv/pull/231 and
https://github.com/libuv/libuv/pull/287 plus so

core: add ability to customize memory allocator

This patch is composed by the work done in
https://github.com/libuv/libuv/pull/231 and
https://github.com/libuv/libuv/pull/287 plus some changes by yours
truly.

Thanks @beevik and @mattsta for their work on this!

PR-URL: https://github.com/libuv/libuv/pull/368
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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Revert "memory: add uv_replace_allocator"

This reverts commit c272f1f1bc0bda625e6441d798c110b4064a6ce2.

The concept will come back to libuv, but it needs some more work.

memory: add uv_replace_allocator

With uv_replace_allocator, it's possible to override the default
memory allocator's malloc and free calls with functions of the user's
choosing. This

memory: add uv_replace_allocator

With uv_replace_allocator, it's possible to override the default
memory allocator's malloc and free calls with functions of the user's
choosing. This allows libuv to interoperate with projects requiring a
custom memory allocator.

Internally, all calls to malloc and free have been replaced with
uv__malloc and uv__free, respectively. The uv__malloc and uv__free
functions call malloc and free unless they have been overridden by a
previous call to uv_replace_allocator.

As part of this change, the special aligned memory allocations
performed in src/win/fs-event.c have been replaced with standard
allocations. The 4-byte alignment being requested in this file was
unnecessary, since standard allocators already guarantee at least an
8-byte alignment.

PR-URL: https://github.com/libuv/libuv/pull/231
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

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unix, windows: uv_dlerror const argument

openbsd: fix dlerror() const correctness warning

unix: assume that dlopen() clobbers dlerror()

Or rather, don't assume that dlopen() does *not* clobber dlerror().

Joe Ferner reports that loading libjava on OS X sets dlerror() even

unix: assume that dlopen() clobbers dlerror()

Or rather, don't assume that dlopen() does *not* clobber dlerror().

Joe Ferner reports that loading libjava on OS X sets dlerror() even when
dlopen() succeeds, which makes uv_dlopen() raise an error when it shouldn't.

I haven't been able to reproduce it but it's possible that libjava clobbers
dlerror() by trying (and failing) to load other libraries.

At any rate, Joe confirmed that this patch addresses the issue.

Fixes #462.

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unix: reset error status in uv_dlopen()

Fixes a bug where uv_dlopen() mistakenly reported failure because of previous
errors.

unix: don't use setlocale()

setlocale() is not inherently thread-safe. We'll have to live with the fact
that test/test-dlerror.c fails on systems with localized error messages.

unix, win: rework uv_dlopen() API

unix: change uv_dl*() error code

Return UV_ENOENT instead of UV_EINVAL. UV_EINVAL was arbitrarily chosen and
turns out to be inconsistent with the Windows implementation.

Fixes

unix: change uv_dl*() error code

Return UV_ENOENT instead of UV_EINVAL. UV_EINVAL was arbitrarily chosen and
turns out to be inconsistent with the Windows implementation.

Fixes #395.

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win, unix: add uv_dlerror() and uv_dlerror_free()

unix: it's legal for dlsym() to return NULL

A symbol name can map to NULL. Check dlerror() to see if a real error happened.

unix: the dl functions don't set errno

uv_kill

Implement uv_dlopen and friends