mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-12-22 21:22:37 +01:00
205 lines
3.9 KiB
C
205 lines
3.9 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _GNU_SOURCE
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#include <features.h>
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#ifdef HAVE_BACKTRACE
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <execinfo.h>
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#include <dlfcn.h>
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#include <linux/limits.h>
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#include <ell/ell.h>
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#include "src/backtrace.h"
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static const char *program_exec;
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static const char *program_path;
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void __iwd_backtrace_print(unsigned int offset)
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{
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void *frames[99];
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size_t n_ptrs;
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unsigned int i;
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int outfd[2], infd[2];
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int pathlen;
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pid_t pid;
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if (program_exec == NULL)
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return;
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pathlen = strlen(program_path);
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n_ptrs = backtrace(frames, L_ARRAY_SIZE(frames));
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if (n_ptrs < offset)
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return;
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if (pipe(outfd) < 0)
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return;
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if (pipe(infd) < 0) {
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close(outfd[0]);
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close(outfd[1]);
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return;
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}
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pid = fork();
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if (pid < 0) {
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close(outfd[0]);
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close(outfd[1]);
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close(infd[0]);
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close(infd[1]);
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return;
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}
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if (pid == 0) {
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close(outfd[1]);
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close(infd[0]);
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dup2(outfd[0], STDIN_FILENO);
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dup2(infd[1], STDOUT_FILENO);
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execlp("addr2line", "-C", "-f", "-e", program_exec, NULL);
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exit(EXIT_FAILURE);
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}
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close(outfd[0]);
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close(infd[1]);
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l_error("++++++++ backtrace ++++++++");
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for (i = offset; i < n_ptrs - 1; i++) {
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Dl_info info;
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char addr[20], buf[PATH_MAX * 2];
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int len, written;
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char *ptr, *pos;
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dladdr(frames[i], &info);
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len = snprintf(addr, sizeof(addr), "%p\n", frames[i]);
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if (len < 0)
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break;
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written = write(outfd[1], addr, len);
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if (written < 0)
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break;
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len = read(infd[0], buf, sizeof(buf) - 1);
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if (len < 0)
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break;
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buf[len] = '\0';
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pos = strchr(buf, '\n');
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if (!pos)
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continue;
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*pos++ = '\0';
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if (strcmp(buf, "??") == 0) {
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l_error("#%-2u %p in %s", i - offset,
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frames[i], info.dli_fname);
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continue;
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}
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ptr = strchr(pos, '\n');
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if (!ptr)
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continue;
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*ptr++ = '\0';
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if (strncmp(pos, program_path, pathlen) == 0)
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pos += pathlen + 1;
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l_error("#%-2u %p in %s() at %s", i - offset,
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frames[i], buf, pos);
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}
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l_error("+++++++++++++++++++++++++++");
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kill(pid, SIGTERM);
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close(outfd[1]);
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close(infd[0]);
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}
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static void signal_handler(int signo)
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{
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l_error("Aborting (signal %d) [%s]", signo, program_exec);
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__iwd_backtrace_print(2);
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exit(EXIT_FAILURE);
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}
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void __iwd_backtrace_init()
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{
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static char path[PATH_MAX];
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static char cwd[PATH_MAX];
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struct sigaction sa;
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sigset_t mask;
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ssize_t len;
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/* Attempt to get the full path to our executable */
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len = readlink("/proc/self/exe", path, sizeof(path) - 1);
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if (len > 0) {
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int i;
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path[len] = '\0';
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for (i = len - 1; i >= 0; i--) {
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if (path[i] != '/')
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continue;
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program_exec = path;
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break;
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}
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}
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if (program_exec == NULL)
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return;
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program_path = getcwd(cwd, sizeof(cwd));
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sigemptyset(&mask);
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sa.sa_handler = signal_handler;
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sa.sa_mask = mask;
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sa.sa_flags = 0;
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sigaction(SIGBUS, &sa, NULL);
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sigaction(SIGILL, &sa, NULL);
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sigaction(SIGFPE, &sa, NULL);
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sigaction(SIGSEGV, &sa, NULL);
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sigaction(SIGABRT, &sa, NULL);
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sigaction(SIGPIPE, &sa, NULL);
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}
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#endif
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