ZoneMinder/src/zm_signal.cpp at master · bountysource-support/ZoneMinder · GitHub

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// ZoneMinder Signal Handling Implementation, $Date$, $Revision$

// This program is free software; you can redistribute it and/or

// modify it under the terms of the GNU General Public License

// as published by the Free Software Foundation; either version 2

// of the License, or (at your option) any later version.

// This program 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 General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "zm.h"

#include "zm_signal.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#define TRACE_SIZE 16

bool zm_reload = false;

bool zm_terminate = false;

RETSIGTYPE zm_hup_handler(int signal)

{

Info("Got signal %d (%s), reloading", signal, strsignal(signal));

zm_reload = true;

}

RETSIGTYPE zm_term_handler(int signal)

{

Info("Got signal %d (%s), exiting", signal, strsignal(signal));

zm_terminate = true;

}

#if ( HAVE_SIGINFO_T && HAVE_UCONTEXT_T )

RETSIGTYPE zm_die_handler(int signal, siginfo_t * info, void *context)

#else

RETSIGTYPE zm_die_handler(int signal)

#endif

{

#if (defined(__i386__) || defined(__x86_64__))

void *cr2 = 0;

void *ip = 0;

#endif

Error("Got signal %d (%s), crashing", signal, strsignal(signal));

#if (defined(__i386__) || defined(__x86_64__))

// Get more information if available

#if ( HAVE_SIGINFO_T && HAVE_UCONTEXT_T )

if (info && context) {

Debug(1,

"Signal information: number %d code %d errno %d pid %d uid %d status %d",

signal, info->si_code, info->si_errno, info->si_pid,

info->si_uid, info->si_status);

ucontext_t *uc = (ucontext_t *) context;

#if defined(__x86_64__)

cr2 = info->si_addr;

ip = (void *)(uc->uc_mcontext.gregs[REG_RIP]);

#else

cr2 = info->si_addr;

ip = (void *)(uc->uc_mcontext.gregs[REG_EIP]);

#endif // defined(__x86_64__)

// Print the signal address and instruction pointer if available

if (ip) {

Error("Signal address is %p, from %p", cr2, ip);

} else {

Error("Signal address is %p, no instruction pointer", cr2);

}

#endif // ( HAVE_SIGINFO_T && HAVE_UCONTEXT_T )

// Print backtrace if enabled and available

#if ( !defined(ZM_NO_CRASHTRACE) && HAVE_DECL_BACKTRACE && HAVE_DECL_BACKTRACE_SYMBOLS )

void *trace[TRACE_SIZE];

int trace_size = 0;

trace_size = backtrace(trace, TRACE_SIZE);

char cmd[1024] = "addr2line -e ";

char *cmd_ptr = cmd + strlen(cmd);

cmd_ptr += snprintf(cmd_ptr, sizeof(cmd) - (cmd_ptr - cmd), "%s", self);

char **messages = backtrace_symbols(trace, trace_size);

// Print the full backtrace

for (int i = 0; i < trace_size; i++) {

Error("Backtrace %u: %s", i, messages[i]);

cmd_ptr +=

snprintf(cmd_ptr, sizeof(cmd) - (cmd_ptr - cmd), " %p",

trace[i]);

}

free(messages);

Info("Backtrace complete, please execute the following command for more information");

Info(cmd);

#endif // ( !defined(ZM_NO_CRASHTRACE) && HAVE_DECL_BACKTRACE && HAVE_DECL_BACKTRACE_SYMBOLS )

#endif // (defined(__i386__) || defined(__x86_64__)

exit(signal);

}

void zmSetHupHandler(SigHandler * handler)

{

sigset_t block_set;

sigemptyset(&block_set);

struct sigaction action, old_action;

action.sa_handler = (SigHandler *) handler;

action.sa_mask = block_set;

action.sa_flags = SA_RESTART;

sigaction(SIGHUP, &action, &old_action);

}

void zmSetTermHandler(SigHandler * handler)

{

sigset_t block_set;

sigemptyset(&block_set);

struct sigaction action, old_action;

action.sa_handler = (SigHandler *) handler;

action.sa_mask = block_set;

action.sa_flags = SA_RESTART;

sigaction(SIGTERM, &action, &old_action);

sigaction(SIGINT, &action, &old_action);

sigaction(SIGQUIT, &action, &old_action);

}

void zmSetDieHandler(SigHandler * handler)

{

sigset_t block_set;

sigemptyset(&block_set);

struct sigaction action, old_action;

action.sa_mask = block_set;

#if ( HAVE_SIGINFO_T && HAVE_UCONTEXT_T )

action.sa_sigaction = (void (*)(int, siginfo_t *, void *))handler;

action.sa_flags = SA_SIGINFO;

#else

action.sa_handler = (SigHandler *) handler;

action.sa_flags = 0;

#endif

sigaction(SIGBUS, &action, &old_action);

sigaction(SIGSEGV, &action, &old_action);

sigaction(SIGABRT, &action, &old_action);

sigaction(SIGILL, &action, &old_action);

sigaction(SIGFPE, &action, &old_action);

}

void zmSetDefaultHupHandler()

{

zmSetHupHandler((SigHandler *) zm_hup_handler);

}

void zmSetDefaultTermHandler()

{

zmSetTermHandler((SigHandler *) zm_term_handler);

}

void zmSetDefaultDieHandler()

{

if (config.dump_cores) {

// Do nothing

} else {

zmSetDieHandler((SigHandler *) zm_die_handler);

}

ZoneMinder/src/zm_signal.cpp at master · bountysource-support/ZoneMinder · GitHub

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