usr/src/cmd/lofiadm/utils.c

   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  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <sys/types.h>
  27 #include <sys/param.h>
  28 #include <sys/stat.h>
  29 #include <sys/statvfs.h>
  30 #include <sys/sysmacros.h>
  31 #include <libintl.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <stdarg.h>
  35 #include <stdio.h>
  36 #include <errno.h>
  37 #include <dlfcn.h>
  38 #include <link.h>
  39
  40 #include "utils.h"
  41
  42 static void *lib_hdl = NULL;
  43
  44 static const char PNAME_FMT[] = "%s: ";
  45 static const char ERRNO_FMT[] = ": %s\n";
  46
  47 static const char *pname;
  48
  49 /*PRINTFLIKE1*/
  50 void
  51 warn(const char *format, ...)
  52 {
  53         int err = errno;
  54         va_list alist;
  55
  56         if (pname != NULL)
  57                 (void) fprintf(stderr, gettext(PNAME_FMT), pname);
  58
  59         va_start(alist, format);
  60         (void) vfprintf(stderr, format, alist);
  61         va_end(alist);
  62
  63         if (strchr(format, '\n') == NULL)
  64                 (void) fprintf(stderr, gettext(ERRNO_FMT), strerror(err));
  65 }
  66
  67 /*PRINTFLIKE1*/
  68 void
  69 die(const char *format, ...)
  70 {
  71         int err = errno;
  72         va_list alist;
  73
  74         if (pname != NULL)
  75                 (void) fprintf(stderr, gettext(PNAME_FMT), pname);
  76
  77         va_start(alist, format);
  78         (void) vfprintf(stderr, format, alist);
  79         va_end(alist);
  80
  81         if (strchr(format, '\n') == NULL)
  82                 (void) fprintf(stderr, gettext(ERRNO_FMT), strerror(err));
  83         exit(E_ERROR);
  84 }
  85
  86 const char *
  87 getpname(const char *arg0)
  88 {
  89         const char *p = strrchr(arg0, '/');
  90
  91         if (p == NULL)
  92                 p = arg0;
  93         else
  94                 p++;
  95
  96         pname = p;
  97         return (p);
  98 }
  99
 100 int
 101 valid_abspath(const char *p)
 102 {
 103         if (p[0] != '/') {
 104                 warn(gettext("pathname is not an absolute path -- %s\n"), p);
 105                 return (0);
 106         }
 107
 108         if (strlen(p) > MAXPATHLEN) {
 109                 warn(gettext("pathname is too long -- %s\n"), p);
 110                 return (0);
 111         }
 112
 113         return (1);
 114 }
 115
 116 /*
 117  * Wrapper for dlopen'ing a library.
 118  * The caller must call closelib() once
 119  * access to the library is no longer needed.
 120  */
 121 void *
 122 openlib(const char *lib)
 123 {
 124         lib_hdl = dlopen(lib, RTLD_LAZY);
 125         return (lib_hdl);
 126 }
 127
 128 void
 129 closelib()
 130 {
 131         if (lib_hdl != NULL)
 132                 (void) dlclose(lib_hdl);
 133 }