Paul Eggert 69fda43b8d free: preserve errno [BZ#17924] ...

In the next release of POSIX, free must preserve errno
<https://www.austingroupbugs.net/view.php?id=385>.
Modify __libc_free to save and restore errno, so that
any internal munmap etc. syscalls do not disturb the caller's errno.
Add a test malloc/tst-free-errno.c (almost all by Bruno Haible),
and document that free preserves errno.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

2020-12-29 00:46:46 -08:00

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