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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1988 AT&T
* All Rights Reserved
*/
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libelf.h>
#include <errno.h>
#include "decl.h"
#include "msg.h"
/*
* File output
* These functions write output files.
* On SVR4 and newer systems use mmap(2). On older systems (or on
* file systems that don't support mmap), use write(2).
*/
char *
_elf_outmap(int fd, size_t sz, unsigned int *pflag)
{
char *p;
/*
* Note: Some NFS implementations do not provide from enlarging a file
* via ftruncate(), thus this may fail with ENOSUP. In this case the
* fall through to the calloc() mechanism will occur.
*/
if ((!*pflag) && (ftruncate(fd, (off_t)sz) == 0) &&
(p = mmap((char *)0, sz, PROT_READ+PROT_WRITE,
MAP_SHARED, fd, (off_t)0)) != (char *)-1) {
*pflag = 1;
return (p);
}
*pflag = 0;
/*
* If mmap fails, try calloc. Some file systems don't mmap. Note, we
* use calloc rather than malloc, as ld(1) assumes that the backing
* storage it is working with is zero filled.
*/
if ((p = (char *)calloc(1, sz)) == 0)
_elf_seterr(EMEM_OUT, errno);
return (p);
}
size_t
_elf_outsync(int fd, char *p, size_t sz, unsigned int flag)
{
if (flag != 0) {
int rv, err;
err = ENOTSUP; /* msync should only return 0 or -1 */
rv = msync(p, sz, MS_ASYNC);
if (rv == -1)
err = errno;
(void) munmap(p, sz);
if (rv == 0)
return (sz);
_elf_seterr(EIO_SYNC, err);
return (0);
}
if ((lseek(fd, 0L, SEEK_SET) == 0) &&
(write(fd, p, sz) == sz)) {
(void) free(p);
return (sz);
}
_elf_seterr(EIO_WRITE, errno);
return (0);
}
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