1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 1988 AT&T 29 * All Rights Reserved 30 */ 31 32 #include <sys/mman.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <libelf.h> 37 #include <errno.h> 38 #include "decl.h" 39 #include "msg.h" 40 41 /* 42 * File output 43 * These functions write output files. 44 * On SVR4 and newer systems use mmap(2). On older systems (or on 45 * file systems that don't support mmap), use write(2). 46 */ 47 48 49 char * 50 _elf_outmap(int fd, size_t sz, unsigned int *pflag) 51 { 52 char *p; 53 54 /* 55 * Note: Some NFS implementations do not provide from enlarging a file 56 * via ftruncate(), thus this may fail with ENOSUP. In this case the 57 * fall through to the calloc() mechanism will occur. 58 */ 59 if ((!*pflag) && (ftruncate(fd, (off_t)sz) == 0) && 60 (p = mmap((char *)0, sz, PROT_READ+PROT_WRITE, 61 MAP_SHARED, fd, (off_t)0)) != (char *)-1) { 62 *pflag = 1; 63 return (p); 64 } 65 66 *pflag = 0; 67 68 /* 69 * If mmap fails, try calloc. Some file systems don't mmap. Note, we 70 * use calloc rather than malloc, as ld(1) assumes that the backing 71 * storage it is working with is zero filled. 72 */ 73 if ((p = (char *)calloc(1, sz)) == 0) 74 _elf_seterr(EMEM_OUT, errno); 75 return (p); 76 } 77 78 79 size_t 80 _elf_outsync(int fd, char *p, size_t sz, unsigned int flag) 81 { 82 if (flag != 0) { 83 int rv, err; 84 85 err = ENOTSUP; /* msync should only return 0 or -1 */ 86 rv = msync(p, sz, MS_ASYNC); 87 if (rv == -1) 88 err = errno; 89 (void) munmap(p, sz); 90 if (rv == 0) 91 return (sz); 92 _elf_seterr(EIO_SYNC, err); 93 return (0); 94 } 95 if ((lseek(fd, 0L, SEEK_SET) == 0) && 96 (write(fd, p, sz) == sz)) { 97 (void) free(p); 98 return (sz); 99 } 100 _elf_seterr(EIO_WRITE, errno); 101 return (0); 102 } 103