Line data    Source code

       1             : /* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
       2             : /*
       3             :    Copyright (C) 2011 Red Hat, Inc.
       4             : 
       5             :    This library is free software; you can redistribute it and/or
       6             :    modify it under the terms of the GNU Lesser General Public
       7             :    License as published by the Free Software Foundation; either
       8             :    version 2.1 of the License, or (at your option) any later version.
       9             : 
      10             :    This library is distributed in the hope that it will be useful,
      11             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13             :    Lesser General Public License for more details.
      14             : 
      15             :    You should have received a copy of the GNU Lesser General Public
      16             :    License along with this library; if not, see <http://www.gnu.org/licenses/>.
      17             : */
      18             : 
      19             : /*
      20             :  * Taken from xserver os/backtrace.c:
      21             :  * Copyright (C) 2008 Red Hat, Inc.
      22             :  */
      23             : 
      24             : #include <config.h>
      25             : 
      26             : #if !defined(WIN32) || defined(__MINGW32__)
      27             : 
      28             : #include "backtrace.h"
      29             : 
      30             : #include <errno.h>
      31             : #include <stdio.h>
      32             : #include <stdlib.h>
      33             : #include <unistd.h>
      34             : #include <sys/types.h>
      35             : #ifndef __MINGW32__
      36             : #include <sys/wait.h>
      37             : #endif
      38             : 
      39             : #define GSTACK_PATH "/usr/bin/gstack"
      40             : 
      41             : #if HAVE_EXECINFO_H
      42             : #include <execinfo.h>
      43             : 
      44             : static void spice_backtrace_backtrace(void)
      45             : {
      46             :     void *array[100];
      47             :     int size;
      48             : 
      49             :     size = backtrace(array, sizeof(array)/sizeof(array[0]));
      50             :     backtrace_symbols_fd(array, size, STDERR_FILENO);
      51             : }
      52             : #else
      53           0 : static void spice_backtrace_backtrace(void)
      54             : {
      55           0 : }
      56             : #endif
      57             : 
      58             : /* XXX perhaps gstack can be available in windows but pipe/waitpid isn't,
      59             :  * so until it is ported properly just compile it out, we lose the
      60             :  * backtrace only. */
      61             : #ifndef __MINGW32__
      62           0 : static int spice_backtrace_gstack(void)
      63             : {
      64             :     pid_t kidpid;
      65             :     int pipefd[2];
      66             : 
      67           0 :     if (pipe(pipefd) != 0) {
      68           0 :         return -1;
      69             :     }
      70             : 
      71           0 :     kidpid = fork();
      72             : 
      73           0 :     if (kidpid == -1) {
      74             :         /* ERROR */
      75           0 :         return -1;
      76           0 :     } else if (kidpid == 0) {
      77             :         /* CHILD */
      78             :         char parent[16];
      79             : 
      80           0 :         close(STDIN_FILENO);
      81           0 :         close(STDOUT_FILENO);
      82           0 :         dup2(pipefd[1],STDOUT_FILENO);
      83           0 :         close(STDERR_FILENO);
      84             : 
      85           0 :         snprintf(parent, sizeof(parent), "%d", getppid());
      86           0 :         execle(GSTACK_PATH, "gstack", parent, NULL, NULL);
      87           0 :         exit(1);
      88             :     } else {
      89             :         /* PARENT */
      90             :         char btline[256];
      91             :         int kidstat;
      92             :         int bytesread;
      93           0 :         int done = 0;
      94             : 
      95           0 :         close(pipefd[1]);
      96             : 
      97           0 :         while (!done) {
      98           0 :             bytesread = read(pipefd[0], btline, sizeof(btline) - 1);
      99             : 
     100           0 :             if (bytesread > 0) {
     101           0 :                 btline[bytesread] = 0;
     102           0 :                 fprintf(stderr, "%s", btline);
     103             :             }
     104           0 :             else if ((bytesread == 0) ||
     105           0 :                      ((errno != EINTR) && (errno != EAGAIN))) {
     106           0 :                 done = 1;
     107             :             }
     108             :         }
     109           0 :         close(pipefd[0]);
     110           0 :         waitpid(kidpid, &kidstat, 0);
     111           0 :         if (kidstat != 0)
     112           0 :             return -1;
     113             :     }
     114           0 :     return 0;
     115             : }
     116             : #else
     117             : static int spice_backtrace_gstack(void)
     118             : {
     119             :     /* empty failing implementation */
     120             :     return -1;
     121             : }
     122             : #endif
     123             : 
     124           0 : void spice_backtrace(void)
     125             : {
     126           0 :     int ret = -1;
     127             : 
     128           0 :     if (!access(GSTACK_PATH, X_OK)) {
     129           0 :         ret = spice_backtrace_gstack();
     130             :     }
     131           0 :     if (ret != 0) {
     132           0 :         spice_backtrace_backtrace();
     133             :     }
     134           0 : }
     135             : #endif