code.delx.au - pulseaudio/blob - src/pulsecore/core-error.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #ifdef HAVE_PTHREAD
  35 #include <pthread.h>
  36 #endif
  37
  38 #ifdef HAVE_WINDOWS_H
  39 #include <windows.h>
  40 #endif
  41
  42 #include <pulse/utf8.h>
  43 #include <pulse/xmalloc.h>
  44
  45 #include <pulsecore/core-util.h>
  46 #include <pulsecore/native-common.h>
  47
  48 #include "core-error.h"
  49
  50 #ifdef HAVE_PTHREAD
  51
  52 static pthread_once_t cstrerror_once = PTHREAD_ONCE_INIT;
  53 static pthread_key_t tlsstr_key;
  54
  55 static void inittls(void) {
  56     int ret;
  57
  58     ret = pthread_key_create(&tlsstr_key, pa_xfree);
  59     if (ret) {
  60         fprintf(stderr, __FILE__ ": CRITICAL: Unable to allocate TLS key (%d)\n", errno);
  61         exit(-1);
  62     }
  63 }
  64
  65 #elif HAVE_WINDOWS_H
  66
  67 static DWORD tlsstr_key = TLS_OUT_OF_INDEXES;
  68 static DWORD monitor_key = TLS_OUT_OF_INDEXES;
  69
  70 static void inittls(void) {
  71     HANDLE mutex;
  72     char name[64];
  73
  74     sprintf(name, "pulse%d", (int)GetCurrentProcessId());
  75
  76     mutex = CreateMutex(NULL, FALSE, name);
  77     if (!mutex) {
  78         fprintf(stderr, __FILE__ ": CRITICAL: Unable to create named mutex (%d)\n", (int)GetLastError());
  79         exit(-1);
  80     }
  81
  82     WaitForSingleObject(mutex, INFINITE);
  83
  84     if (tlsstr_key == TLS_OUT_OF_INDEXES) {
  85         tlsstr_key = TlsAlloc();
  86         monitor_key = TlsAlloc();
  87         if ((tlsstr_key == TLS_OUT_OF_INDEXES) || (monitor_key == TLS_OUT_OF_INDEXES)) {
  88             fprintf(stderr, __FILE__ ": CRITICAL: Unable to allocate TLS key (%d)\n", (int)GetLastError());
  89             exit(-1);
  90         }
  91     }
  92
  93     ReleaseMutex(mutex);
  94
  95     CloseHandle(mutex);
  96 }
  97
  98 /*
  99  * This is incredibly brain dead, but this is necessary when dealing with
 100  * the hell that is Win32.
 101  */
 102 struct monitor_data {
 103     HANDLE thread;
 104     void *data;
 105 };
 106
 107 static DWORD WINAPI monitor_thread(LPVOID param) {
 108     struct monitor_data *data;
 109
 110     data = (struct monitor_data*)param;
 111     assert(data);
 112
 113     WaitForSingleObject(data->thread, INFINITE);
 114
 115     CloseHandle(data->thread);
 116     pa_xfree(data->data);
 117     pa_xfree(data);
 118
 119     return 0;
 120 }
 121
 122 static void start_monitor(void) {
 123     HANDLE thread;
 124     struct monitor_data *data;
 125
 126     data = pa_xnew(struct monitor_data, 1);
 127     assert(data);
 128
 129     DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
 130         GetCurrentProcess(), &data->thread, 0, FALSE, DUPLICATE_SAME_ACCESS);
 131
 132     thread = CreateThread(NULL, 0, monitor_thread, data, 0, NULL);
 133     assert(thread);
 134
 135     TlsSetValue(monitor_key, data);
 136
 137     CloseHandle(thread);
 138 }
 139
 140 #else
 141
 142 /* Unsafe, but we have no choice */
 143 static char *tlsstr;
 144
 145 #endif
 146
 147 const char* pa_cstrerror(int errnum) {
 148     const char *origbuf;
 149
 150 #ifdef HAVE_STRERROR_R
 151     char errbuf[128];
 152 #endif
 153
 154 #ifdef HAVE_PTHREAD
 155     char *tlsstr;
 156
 157     pthread_once(&cstrerror_once, inittls);
 158
 159     tlsstr = pthread_getspecific(tlsstr_key);
 160 #elif defined(HAVE_WINDOWS_H)
 161     char *tlsstr;
 162     struct monitor_data *data;
 163
 164     inittls();
 165
 166     tlsstr = TlsGetValue(tlsstr_key);
 167     if (!tlsstr)
 168         start_monitor();
 169     data = TlsGetValue(monitor_key);
 170 #endif
 171
 172     if (tlsstr)
 173         pa_xfree(tlsstr);
 174
 175 #ifdef HAVE_STRERROR_R
 176
 177 #ifdef __GLIBC__
 178     origbuf = strerror_r(errnum, errbuf, sizeof(errbuf));
 179     if (origbuf == NULL)
 180         origbuf = "";
 181 #else
 182     if (strerror_r(errnum, errbuf, sizeof(errbuf)) == 0) {
 183         origbuf = errbuf;
 184         errbuf[sizeof(errbuf) - 1] = '\0';
 185     } else
 186         origbuf = "";
 187 #endif
 188
 189 #else
 190     /* This might not be thread safe, but we hope for the best */
 191     origbuf = strerror(errnum);
 192 #endif
 193
 194     tlsstr = pa_locale_to_utf8(origbuf);
 195     if (!tlsstr) {
 196         fprintf(stderr, "Unable to convert, filtering\n");
 197         tlsstr = pa_utf8_filter(origbuf);
 198     }
 199
 200 #ifdef HAVE_PTHREAD
 201     pthread_setspecific(tlsstr_key, tlsstr);
 202 #elif defined(HAVE_WINDOWS_H)
 203     TlsSetValue(tlsstr_key, tlsstr);
 204     data->data = tlsstr;
 205 #endif
 206
 207     return tlsstr;
 208 }