loader/glibc.c

   1 /*
   2  * glibc threading support
   3  *
   4  * Copyright 2003 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <pthread.h>
  28
  29 #include "wine/library.h"
  30
  31 /* malloc wrapper */
  32 static void *xmalloc( size_t size )
  33 {
  34     void *res;
  35
  36     if (!size) size = 1;
  37     if (!(res = malloc( size )))
  38     {
  39         fprintf( stderr, "wine: virtual memory exhausted\n" );
  40         exit(1);
  41     }
  42     return res;
  43 }
  44
  45 /* separate thread to check for NPTL and TLS features */
  46 static void *needs_pthread( void *arg )
  47 {
  48     pid_t tid = gettid();
  49     /* check for NPTL */
  50     if (tid != -1 && tid != getpid()) return (void *)1;
  51     /* check for TLS glibc */
  52     return (void *)(wine_get_gs() != 0);
  53 }
  54
  55 /* return the name of the Wine threading variant to use */
  56 static const char *get_threading(void)
  57 {
  58     pthread_t id;
  59     void *ret;
  60
  61     pthread_create( &id, NULL, needs_pthread, NULL );
  62     pthread_join( id, &ret );
  63     return ret ? "wine-pthread" : "wine-kthread";
  64 }
  65
  66
  67 /**********************************************************************
  68  *           main
  69  */
  70 int main( int argc, char *argv[] )
  71 {
  72     const char *loader = getenv( "WINELOADER" );
  73     const char *threads = get_threading();
  74
  75     if (loader)
  76     {
  77         const char *path;
  78         char *new_name, *new_loader;
  79
  80         if ((path = strrchr( loader, '/' ))) path++;
  81         else path = loader;
  82
  83         new_name = xmalloc( (path - loader) + strlen(threads) + 1 );
  84         memcpy( new_name, loader, path - loader );
  85         strcpy( new_name + (path - loader), threads );
  86
  87         /* update WINELOADER with the new name */
  88         new_loader = xmalloc( sizeof("WINELOADER=") + strlen(new_name) );
  89         strcpy( new_loader, "WINELOADER=" );
  90         strcat( new_loader, new_name );
  91         putenv( new_loader );
  92         argv[0] = new_name;
  93         execv( argv[0], argv );
  94     }
  95     else
  96     {
  97         wine_init_argv0_path( argv[0] );
  98         wine_exec_wine_binary( threads, argv, NULL );
  99     }
 100     fprintf( stderr, "wine: could not exec %s\n", argv[0] );
 101     exit(1);
 102 }