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/* $Id$ */
/***
This file is part of avahi.
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
avahi is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pthread.h>
#include <unistd.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <stdarg.h>
#include <syslog.h>
#include "warn.h"
#ifndef COMPAT_LAYER
#define COMPAT_LAYER "Apple Bonjour"
#endif
#ifndef CGI_SUBSYSTEM
#define CGI_SUBSYSTEM "libdns_sd"
#endif
static pthread_mutex_t linkage_mutex = PTHREAD_MUTEX_INITIALIZER;
static int linkage_warning = 0;
const char *avahi_exe_name(void) {
#ifdef HAVE_GETPROGNAME
return getprogname();
#elif defined(__linux__)
static char exe_name[1024] = "";
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/* Yes, I know, this is not portable. But who cares? It's for
* cosmetics only, anyway. */
pthread_mutex_lock(&mutex);
if (exe_name[0] == 0) {
int k;
if ((k = readlink("/proc/self/exe", exe_name, sizeof(exe_name)-1)) < 0)
snprintf(exe_name, sizeof(exe_name), "(unknown)");
else {
char *slash;
assert((size_t) k <= sizeof(exe_name)-1);
exe_name[k] = 0;
if ((slash = strrchr(exe_name, '/')))
memmove(exe_name, slash+1, strlen(slash)+1);
}
}
pthread_mutex_unlock(&mutex);
return exe_name;
#else
#ifdef __GNUC__
#warning "avahi_exe_name() needs to be implemented for your operating system"
#endif
return "(unknown)";
#endif
}
void avahi_warn(const char *fmt, ...) {
char msg[512] = "*** WARNING *** ";
va_list ap;
size_t n;
assert(fmt);
va_start(ap, fmt);
n = strlen(msg);
vsnprintf(msg + n, sizeof(msg) - n, fmt, ap);
va_end(ap);
fprintf(stderr, "%s\n", msg);
openlog(avahi_exe_name(), LOG_PID, LOG_USER);
syslog(LOG_WARNING, "%s", msg);
closelog();
}
void avahi_warn_linkage(void) {
int w;
pthread_mutex_lock(&linkage_mutex);
w = linkage_warning;
linkage_warning = 1;
pthread_mutex_unlock(&linkage_mutex);
if (!w && !getenv("AVAHI_COMPAT_NOWARN")) {
avahi_warn("The programme '%s' uses the "COMPAT_LAYER" compatiblity layer of Avahi.", avahi_exe_name());
avahi_warn("Please fix your application to use the native API of Avahi!");
avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s>", avahi_exe_name());
}
}
void avahi_warn_unsupported(const char *function) {
avahi_warn("The programme '%s' called '%s()' which is not supported (or only supported partially) in the "COMPAT_LAYER" compatiblity layer of Avahi.", avahi_exe_name(), function);
avahi_warn("Please fix your application to use the native API of Avahi!");
avahi_warn("For more information see <http://0pointer.de/avahi-compat?s="CGI_SUBSYSTEM"&e=%s&f=%s>", avahi_exe_name(), function);
}
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