lib/libkcore/kcore.c

   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/kinfo.h>
  38 #include <sys/param.h>
  39 #include <sys/fcntl.h>
  40
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <kcore.h>
  44 #include <kvm.h>
  45 #include <stdlib.h>
  46
  47 #include "kcore_private.h"
  48
  49 struct kcore_data kcore_global;
  50
  51 static int
  52 kcore_open_int(struct kcore_data *kc, const char *execfile,
  53                const char *corefile, char *errbuf)
  54 {
  55         kc->kd = kvm_openfiles(execfile, corefile, NULL, O_RDONLY, errbuf);
  56
  57         if (kc->kd == NULL)
  58                 return(-1);
  59         else
  60                 return(0);
  61 }
  62
  63 int
  64 kcore_wrapper_open(const char *execfile, const char *corefile, char *errbuf)
  65 {
  66         return(kcore_open_int(&kcore_global, execfile, corefile, errbuf));
  67 }
  68
  69 struct kcore_data *
  70 kcore_open(const char *execfile, const char *corefile, char *errbuf)
  71 {
  72         struct kcore_data *kc;
  73
  74         kc = malloc(sizeof(*kc));
  75         if (kc == NULL)
  76                 return(NULL);
  77         if (kcore_open_int(kc, execfile, corefile, errbuf)) {
  78                 free(kc);
  79                 return(NULL);
  80         }
  81
  82         return(kc);
  83 }
  84
  85 int
  86 kcore_close(struct kcore_data *kc)
  87 {
  88         int retval;
  89
  90         if (kc == NULL) {
  91                 retval = kvm_close(kcore_global.kd);
  92                 return(retval);
  93         }
  94
  95         retval = kvm_close(kc->kd);
  96         free(kc);
  97         return(retval);
  98 }
  99
 100 int
 101 kcore_get_generic(struct kcore_data *kc, struct nlist *nl,
 102                   void *data, size_t len)
 103 {
 104         if (kc == NULL)
 105                 kc = &kcore_global;
 106
 107         if (nl[0].n_value == 0) {
 108                 if ((kvm_nlist(kc->kd, nl) < 0) || (nl[0].n_value == 0)) {
 109                         errno = EOPNOTSUPP;
 110                         return(-1);
 111                 }
 112         }
 113         if (kvm_read(kc->kd, nl[0].n_value, data, len) != (int)len) {
 114                 warnx("cannot read %s: %s", nl[0].n_name, kvm_geterr(kc->kd));
 115                 errno = EINVAL;
 116                 return(-1);
 117         }
 118         return(0);
 119 }