From e9dc4ff30eedfc944340f6c594b1ba36442f1020 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Fri, 1 Jan 2016 18:14:07 +0100 Subject: partially split malloc.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/malloc/posix_memalign.c | 51 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 src/malloc/posix_memalign.c (limited to 'src/malloc/posix_memalign.c') diff --git a/src/malloc/posix_memalign.c b/src/malloc/posix_memalign.c new file mode 100644 index 0000000..80d27c8 --- /dev/null +++ b/src/malloc/posix_memalign.c @@ -0,0 +1,51 @@ +/** + * slibc — Yet another C library + * Copyright © 2015, 2016 Mattias Andrée (maandree@member.fsf.org) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#include +#include + + + +/** + * `posix_memalign(p, b, n)` is equivalent to + * `(*p = memalign(b, n), *p ? 0 : errno)`, except + * `boundary` must also be a multiple of `sizeof(void*)`, + * and `errno` is unspecified. + * + * As a GNU-compliant slibc extension, memory allocated + * with this function can be freed with `free`. + * + * @etymology (POSIX)-extension: (mem)ory alignment. + * + * @param ptrptr Output parameter for the allocated memory. + * @param boundary The alignment. + * @param size The number of bytes to allocated. + * @return Zero on success, a value for `errno` on error. + * + * @throws ENOMEM The process cannot allocate more memory. + * @throws EINVAL If `boundary` is not a power-of-two multiple of `sizeof(void*)`. + * + * @since Always. + */ +int posix_memalign(void** ptrptr, size_t boundary, size_t size) +{ + if (boundary < sizeof(void*)) + return EINVAL; + *ptrptr = memalign(boundary, size); + return *ptrptr ? 0 : errno; +} + -- cgit v1.2.3-70-g09d2