83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
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Copyright (C) 2017 Alexey Kopytov <akopytov@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef _WIN32
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#include "sb_win.h"
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#endif
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <inttypes.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include "sb_util.h"
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#include "sb_logger.h"
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/*
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Allocate a buffer of a specified size such that the address is a multiple of a
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specified alignment.
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*/
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void *sb_memalign(size_t size, size_t alignment)
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{
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void *buf;
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#ifdef HAVE_POSIX_MEMALIGN
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int ret= posix_memalign(&buf, alignment, size);
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if (ret != 0)
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buf = NULL;
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#elif defined(HAVE_MEMALIGN)
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buf = memalign(alignment, size);
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#elif defined(HAVE_VALLOC)
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/* Allocate on page boundary */
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(void) alignment; /* unused */
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buffer = valloc(size);
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#elif defined (_WIN32)
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/* Allocate on page boundary */
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(void) alignment; /* unused */
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buffer = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
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#else
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# error Cannot find an aligned allocation library function!
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#endif
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return buf;
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}
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/* Get OS page size */
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size_t sb_getpagesize(void)
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{
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#ifdef _SC_PAGESIZE
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return sysconf(_SC_PAGESIZE);
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#elif defined _WIN32
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SYSTEM_INFO info;
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GetSystemInfo(&info);
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return info.dwPageSize;
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#else
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return getpagesize();
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#endif
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}
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