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 18:28:40 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 }