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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1988 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 32 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.3 */ 33 34 #include "syn.h" 35 #include <sys/mman.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <libelf.h> 40 #include <errno.h> 41 #include "decl.h" 42 #include "msg.h" 43 44 /* 45 * File output 46 * These functions write output files. 47 * On SVR4 and newer systems use mmap(2). On older systems (or on 48 * file systems that don't support mmap), use write(2). 49 */ 50 51 52 char * 53 _elf_outmap(int fd, size_t sz, unsigned int *pflag) 54 { 55 char *p; 56 57 /* 58 * Note: Some NFS implementations do not provide from enlarging a file 59 * via ftruncate(), thus this may fail with ENOSUP. In this case the 60 * fall through to the calloc() mechanism will occur. 61 */ 62 if ((!*pflag) && (ftruncate(fd, (off_t)sz) == 0) && 63 (p = mmap((char *)0, sz, PROT_READ+PROT_WRITE, 64 MAP_SHARED, fd, (off_t)0)) != (char *)-1) { 65 *pflag = 1; 66 return (p); 67 } 68 69 *pflag = 0; 70 71 /* 72 * If mmap fails, try calloc. Some file systems don't mmap. Note, we 73 * use calloc rather than malloc, as ld(1) assumes that the backing 74 * storage it is working with is zero filled. 75 */ 76 if ((p = (char *)calloc(1, sz)) == 0) 77 _elf_seterr(EMEM_OUT, errno); 78 return (p); 79 } 80 81 82 size_t 83 _elf_outsync(int fd, char *p, size_t sz, unsigned int flag) 84 { 85 if (flag != 0) { 86 int err; 87 /* 88 * The value of MS_SYNC changed from zero to non-zero 89 * in SunOS 5.7. This double call covers both cases. 90 */ 91 if ((fd = msync(p, sz, MS_SYNC)) == -1) 92 fd = msync(p, sz, 0); 93 if (fd == -1) 94 err = errno; 95 (void) munmap(p, sz); 96 if (fd == 0) 97 return (sz); 98 _elf_seterr(EIO_SYNC, err); 99 return (0); 100 } 101 if (lseek(fd, 0L, SEEK_SET) == 0) { 102 if (write(fd, p, sz) == sz) { 103 (void) free(p); 104 return (sz); 105 } 106 } 107 _elf_seterr(EIO_WRITE, errno); 108 return (0); 109 } 110