1/* $Id$ */ 2 3/*** 4 This file is part of avahi. 5 6 avahi is free software; you can redistribute it and/or modify it 7 under the terms of the GNU Lesser General Public License as 8 published by the Free Software Foundation; either version 2.1 of the 9 License, or (at your option) any later version. 10 11 avahi is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General 14 Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with avahi; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 19 USA. 20***/ 21 22#ifdef HAVE_CONFIG_H 23#include <config.h> 24#endif 25 26#include <pthread.h> 27#include <unistd.h> 28#include <limits.h> 29#include <stdio.h> 30#include <string.h> 31#include <stdlib.h> 32#include <assert.h> 33#include <stdarg.h> 34#include <syslog.h> 35 36#include "warn.h" 37 38#ifndef COMPAT_LAYER 39#define COMPAT_LAYER "Apple Bonjour" 40#endif 41 42#ifndef CGI_SUBSYSTEM 43#define CGI_SUBSYSTEM "libdns_sd" 44#endif 45 46static pthread_mutex_t linkage_mutex = PTHREAD_MUTEX_INITIALIZER; 47static int linkage_warning = 0; 48 49const char *avahi_exe_name(void) { 50#ifdef HAVE_GETPROGNAME 51 return getprogname(); 52#elif defined(__linux__) 53 static char exe_name[1024] = ""; 54 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; 55 56 /* Yes, I know, this is not portable. But who cares? It's for 57 * cosmetics only, anyway. */ 58 59 pthread_mutex_lock(&mutex); 60 61 if (exe_name[0] == 0) { 62 int k; 63 64 if ((k = readlink("/proc/self/exe", exe_name, sizeof(exe_name)-1)) < 0) 65 snprintf(exe_name, sizeof(exe_name), "(unknown)"); 66 else { 67 char *slash; 68 69 assert((size_t) k <= sizeof(exe_name)-1); 70 exe_name[k] = 0; 71 72 if ((slash = strrchr(exe_name, '/'))) 73 memmove(exe_name, slash+1, strlen(slash)+1); 74 } 75 } 76 77 pthread_mutex_unlock(&mutex); 78 79 return exe_name; 80#else 81#ifdef __GNUC__ 82#warning "avahi_exe_name() needs to be implemented for your operating system" 83#endif 84 return "(unknown)"; 85#endif 86} 87 88void avahi_warn(const char *fmt, ...) { 89 char msg[512] = "*** WARNING *** "; 90 va_list ap; 91 size_t n; 92 93 assert(fmt); 94 95 va_start(ap, fmt); 96 n = strlen(msg); 97 vsnprintf(msg + n, sizeof(msg) - n, fmt, ap); 98 va_end(ap); 99 100 fprintf(stderr, "%s\n", msg); 101 102 openlog(avahi_exe_name(), LOG_PID, LOG_USER); 103 syslog(LOG_WARNING, "%s", msg); 104 closelog(); 105} 106 107void avahi_warn_linkage(void) { 108 int w; 109 110 pthread_mutex_lock(&linkage_mutex); 111 w = linkage_warning; 112 linkage_warning = 1; 113 pthread_mutex_unlock(&linkage_mutex); 114 115 if (!w && !getenv("AVAHI_COMPAT_NOWARN")) { 116 avahi_warn("The program '%s' uses the "COMPAT_LAYER" compatibility layer of Avahi.", avahi_exe_name()); 117 avahi_warn("Please fix your application to use the native API of Avahi!"); 118 avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s>", avahi_exe_name()); 119 } 120} 121 122void avahi_warn_unsupported(const char *function) { 123 avahi_warn("The program '%s' called '%s()' which is not supported (or only supported partially) in the "COMPAT_LAYER" compatibility layer of Avahi.", avahi_exe_name(), function); 124 avahi_warn("Please fix your application to use the native API of Avahi!"); 125 avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s&f=%s>", avahi_exe_name(), function); 126} 127