Re: realloc: Improve documentation

[Paul Eggert]

Thanks. Some further improvements:

* Document whether realloc can fail when not growing a region.

* Mention what happens to errno.

* Mention how the ISO C standard has evolved here.

* Give more details as to which glibc versions do what.

* In the "practical" section, don't bother mentioning possible actions 
that no known system does, as this complicates discussion and doesn't 
help the reader enough to justify inclusion of this info.

* If the program expects successful realloc(p,0) to return non-null but 
realloc actually returns null, the misbehavior should be false reports 
of failure, not double-free bugs.


I installed the attached patch to try to improve the Gnulib manual 
accordingly.

0001-realloc-more-improvements-for-realloc-p-0.patch
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