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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2011 Red Hat, Inc.
This library 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.
This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Taken from xserver os/backtrace.c:
* Copyright (C) 2008 Red Hat, Inc.
*/
#include <config.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#ifndef __MINGW32__
#include <sys/wait.h>
#endif
#include "spice_common.h"
#define GSTACK_PATH "/usr/bin/gstack"
#if HAVE_EXECINFO_H
#include <execinfo.h>
static void spice_backtrace_backtrace(void)
{
void *array[100];
int size;
size = backtrace(array, sizeof(array)/sizeof(array[0]));
backtrace_symbols_fd(array, size, STDERR_FILENO);
}
#else
static void spice_backtrace_backtrace(void)
{
}
#endif
/* XXX perhaps gstack can be available in windows but pipe/waitpid isn't,
* so until it is ported properly just compile it out, we lose the
* backtrace only. */
#ifndef __MINGW32__
static int spice_backtrace_gstack(void)
{
pid_t kidpid;
int pipefd[2];
if (pipe(pipefd) != 0) {
return -1;
}
kidpid = fork();
if (kidpid == -1) {
/* ERROR */
return -1;
} else if (kidpid == 0) {
/* CHILD */
char parent[16];
seteuid(0);
close(STDIN_FILENO);
close(STDOUT_FILENO);
dup2(pipefd[1],STDOUT_FILENO);
close(STDERR_FILENO);
snprintf(parent, sizeof(parent), "%d", getppid());
execle(GSTACK_PATH, "gstack", parent, NULL, NULL);
exit(1);
} else {
/* PARENT */
char btline[256];
int kidstat;
int bytesread;
int done = 0;
close(pipefd[1]);
while (!done) {
bytesread = read(pipefd[0], btline, sizeof(btline) - 1);
if (bytesread > 0) {
btline[bytesread] = 0;
fprintf(stderr, "%s", btline);
}
else if ((bytesread == 0) ||
((errno != EINTR) && (errno != EAGAIN))) {
done = 1;
}
}
close(pipefd[0]);
waitpid(kidpid, &kidstat, 0);
if (kidstat != 0)
return -1;
}
return 0;
}
#else
static int spice_backtrace_gstack(void)
{
/* empty failing implementation */
return -1;
}
#endif
void spice_backtrace(void)
{
int ret = -1;
if (!access(GSTACK_PATH, X_OK)) {
ret = spice_backtrace_gstack();
}
if (ret != 0) {
spice_backtrace_backtrace();
}
}
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