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/*
* Copyright (c) 2003 Gunnar Ritter
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/
/* Sccsid @(#)ib_alloc.c 1.5 (gritter) 3/12/05 */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "memalign.h"
#include "iblok.h"
struct iblok *
ib_alloc(int fd, unsigned blksize)
{
static long pagesize;
struct iblok *ip;
struct stat st;
if (pagesize == 0)
if ((pagesize = sysconf(_SC_PAGESIZE)) < 0)
pagesize = 4096;
if (blksize == 0) {
if (fstat(fd, &st) < 0)
return NULL;
blksize = st.st_blksize > 0 ? st.st_blksize : 512;
}
if ((ip = calloc(1, sizeof *ip)) == NULL)
return NULL;
if ((ip->ib_blk = memalign(pagesize, blksize)) == NULL) {
free(ip);
return NULL;
}
ip->ib_blksize = blksize;
ip->ib_fd = fd;
ip->ib_mb_cur_max = MB_CUR_MAX;
return ip;
}
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