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ib_alloc.c (1725B)


      1 /*
      2  * Copyright (c) 2003 Gunnar Ritter
      3  *
      4  * This software is provided 'as-is', without any express or implied
      5  * warranty. In no event will the authors be held liable for any damages
      6  * arising from the use of this software.
      7  *
      8  * Permission is granted to anyone to use this software for any purpose,
      9  * including commercial applications, and to alter it and redistribute
     10  * it freely, subject to the following restrictions:
     11  *
     12  * 1. The origin of this software must not be misrepresented; you must not
     13  *    claim that you wrote the original software. If you use this software
     14  *    in a product, an acknowledgment in the product documentation would be
     15  *    appreciated but is not required.
     16  *
     17  * 2. Altered source versions must be plainly marked as such, and must not be
     18  *    misrepresented as being the original software.
     19  *
     20  * 3. This notice may not be removed or altered from any source distribution.
     21  */
     22 /*	Sccsid @(#)ib_alloc.c	1.5 (gritter) 3/12/05	*/
     23 
     24 #include	<sys/types.h>
     25 #include	<sys/stat.h>
     26 #include	<fcntl.h>
     27 #include	<unistd.h>
     28 #include	<string.h>
     29 #include	<errno.h>
     30 #include	<stdlib.h>
     31 #include	<malloc.h>
     32 
     33 #include	"memalign.h"
     34 #include	"iblok.h"
     35 
     36 struct iblok *
     37 ib_alloc(int fd, unsigned blksize)
     38 {
     39 	static long	pagesize;
     40 	struct iblok	*ip;
     41 	struct stat	st;
     42 
     43 	if (pagesize == 0)
     44 		if ((pagesize = sysconf(_SC_PAGESIZE)) < 0)
     45 			pagesize = 4096;
     46 	if (blksize == 0) {
     47 		if (fstat(fd, &st) < 0)
     48 			return NULL;
     49 		blksize = st.st_blksize > 0 ? st.st_blksize : 512;
     50 	}
     51 	if ((ip = calloc(1, sizeof *ip)) == NULL)
     52 		return NULL;
     53 	if ((ip->ib_blk = memalign(pagesize, blksize)) == NULL) {
     54 		free(ip);
     55 		return NULL;
     56 	}
     57 	ip->ib_blksize = blksize;
     58 	ip->ib_fd = fd;
     59 	ip->ib_mb_cur_max = MB_CUR_MAX;
     60 	return ip;
     61 }