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99bbb61c05
* lib/posix_memalign.c: Include stdckdint.h. (posix_memalign): Test for overflow more straightforwardly, and more portably to unlikely platforms where SIZE_MAX <= INT_MAX. Treat a zero size as if it were alignment. * m4/posix_memalign.m4 (gl_FUNC_POSIX_MEMALIGN): * tests/test-posix_memalign.c (main): Test zero size too. Use volatile to avoid compiler optimizations. * modules/posix_memalign (Depends-on): Add stdckdint.
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
@node posix_memalign
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@subsection @code{posix_memalign}
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@findex posix_memalign
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/posix_memalign.html}
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Gnulib module: posix_memalign
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@mindex posix_memalign
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Although this function is superseded by @code{aligned_alloc},
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it is more portable to older systems that do not support C11.
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@xref{aligned_alloc}.
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function returns a null pointer if the size argument is zero:
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AIX 7.3.
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@item
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This function produces misaligned results on some platforms:
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OpenBSD 6.1.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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Mac OS X 10.5, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14, Android 4.1.
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@item
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If the alignment and size are absurdly large, this function crashes:
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@c https://sourceware.org/bugzilla/show_bug.cgi?id=32301
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glibc 2.40.
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@end itemize
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@mindex aligned-malloc
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The Gnulib module @code{aligned-malloc} provides functions for
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allocating and freeing blocks of suitably aligned memory.
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@mindex pagealign_alloc
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The Gnulib module @code{pagealign_alloc} provides a similar API for
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allocating and freeing blocks of memory aligned on a system page boundary.
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