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 (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.3 */ 31 32 #include "syn.h" 33 #include <sys/mman.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include <libelf.h> 38 #include <errno.h> 39 #include "decl.h" 40 #include "msg.h" 41 42 /* 43 * File output 44 * These functions write output files. 45 * On SVR4 and newer systems use mmap(2). On older systems (or on 46 * file systems that don't support mmap), use write(2). 47 */ 48 49 50 char * 51 _elf_outmap(int fd, size_t sz, unsigned int *pflag) 52 { 53 char *p; 54 55 /* 56 * Note: Some NFS implementations do not provide from enlarging a file 57 * via ftruncate(), thus this may fail with ENOSUP. In this case the 58 * fall through to the calloc() mechanism will occur. 59 */ 60 if ((!*pflag) && (ftruncate(fd, (off_t)sz) == 0) && 61 (p = mmap((char *)0, sz, PROT_READ+PROT_WRITE, 62 MAP_SHARED, fd, (off_t)0)) != (char *)-1) { 63 *pflag = 1; 64 return (p); 65 } 66 67 *pflag = 0; 68 69 /* 70 * If mmap fails, try calloc. Some file systems don't mmap. Note, we 71 * use calloc rather than malloc, as ld(1) assumes that the backing 72 * storage it is working with is zero filled. 73 */ 74 if ((p = (char *)calloc(1, sz)) == 0) 75 _elf_seterr(EMEM_OUT, errno); 76 return (p); 77 } 78 79 80 size_t 81 _elf_outsync(int fd, char *p, size_t sz, unsigned int flag) 82 { 83 if (flag != 0) { 84 int err; 85 /* 86 * The value of MS_SYNC changed from zero to non-zero 87 * in SunOS 5.7. This double call covers both cases. 88 */ 89 if ((fd = msync(p, sz, MS_SYNC)) == -1) 90 fd = msync(p, sz, 0); 91 if (fd == -1) 92 err = errno; 93 (void) munmap(p, sz); 94 if (fd == 0) 95 return (sz); 96 _elf_seterr(EIO_SYNC, err); 97 return (0); 98 } 99 if ((lseek(fd, 0L, SEEK_SET) == 0) && 100 (write(fd, p, sz) == sz) && (fsync(fd) == 0)) { 101 (void) free(p); 102 return (sz); 103 } 104 _elf_seterr(EIO_WRITE, errno); 105 return (0); 106 } 107