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@node malloc
@section @code{malloc}
@findex malloc
POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/malloc.html}
Gnulib module: malloc-posix
Portability problems fixed by Gnulib:
@itemize
@item
Upon failure, the function does not set @code{errno} to @code{ENOMEM} on
some platforms:
mingw, MSVC 14.
@item
On some platforms, @code{malloc (n)} can succeed even if @code{n}
exceeds @code{PTRDIFF_MAX}. Although this behavior is arguably
allowed by POSIX it can lead to behavior not defined by POSIX later,
so @code{malloc-posix} does not allow going over the limit.
@end itemize
Extension: Gnulib provides a module @samp{malloc-gnu} that substitutes a
@code{malloc} implementation that behaves more like the glibc implementation,
by fixing this portability problem:
@itemize
@item
@code{malloc (0)} returns @code{NULL} on success on some platforms:
AIX 7.2.
@end itemize
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