1 /* 2 * Copyright (c) 2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Joerg Sonnenberger <joerg@bec.de>. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/lib/libkcore/kcore.c,v 1.6 2005/02/03 17:28:40 joerg Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/fcntl.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <kcore.h> 43 #include <kvm.h> 44 #include <stdlib.h> 45 46 #include "kcore_private.h" 47 48 struct kcore_data kcore_global; 49 50 static int 51 kcore_open_int(struct kcore_data *kc, const char *execfile, 52 const char *corefile, char *errbuf) 53 { 54 kc->kd = kvm_openfiles(execfile, corefile, NULL, O_RDONLY, errbuf); 55 56 if (kc->kd == NULL) 57 return(-1); 58 else 59 return(0); 60 } 61 62 int 63 kcore_wrapper_open(const char *execfile, const char *corefile, char *errbuf) 64 { 65 return(kcore_open_int(&kcore_global, execfile, corefile, errbuf)); 66 } 67 68 struct kcore_data * 69 kcore_open(const char *execfile, const char *corefile, char *errbuf) 70 { 71 struct kcore_data *kc; 72 73 kc = malloc(sizeof(*kc)); 74 if (kc == NULL) 75 return(NULL); 76 if (kcore_open_int(kc, execfile, corefile, errbuf)) { 77 free(kc); 78 return(NULL); 79 } 80 81 return(kc); 82 } 83 84 int 85 kcore_close(struct kcore_data *kc) 86 { 87 int retval; 88 89 if (kc == NULL) { 90 retval = kvm_close(kcore_global.kd); 91 return(retval); 92 } 93 94 retval = kvm_close(kc->kd); 95 free(kc); 96 return(retval); 97 } 98 99 int 100 kcore_get_generic(struct kcore_data *kc, struct nlist *nl, 101 void *data, size_t len) 102 { 103 if (kc == NULL) 104 kc = &kcore_global; 105 106 if (nl[0].n_value == 0) { 107 if ((kvm_nlist(kc->kd, nl) < 0) || (nl[0].n_value == 0)) { 108 errno = EOPNOTSUPP; 109 return(-1); 110 } 111 } 112 if (kvm_read(kc->kd, nl[0].n_value, data, len) != (int)len) { 113 warnx("cannot read %s: %s", nl[0].n_name, kvm_geterr(kc->kd)); 114 errno = EINVAL; 115 return(-1); 116 } 117 return(0); 118 } 119