signal_win32.c

#include <stddef.h>
#include <errno.h>
#include <signal.h>
 
#include <winpr/atexit.h>
#include <winpr/wlog.h>
#include <winpr/debug.h>
#include <winpr/assert.h>
 
#include <freerdp/log.h>
#include <freerdp/utils/signal.h>
 
#include "platform_signal.h"
 
#define TAG FREERDP_TAG("utils.signal.posix")
 
static CRITICAL_SECTION signal_lock;
static INIT_ONCE signal_lock_init = INIT_ONCE_STATIC_INIT;
 
static BOOL CALLBACK init_signal_lock(PINIT_ONCE InitOnce, PVOID Parameter, PVOID* Context)
{
  InitializeCriticalSection(&signal_lock);
  return TRUE;
}
 
void fsig_lock(void)
{
  InitOnceExecuteOnce(&signal_lock_init, init_signal_lock, NULL, NULL);
  EnterCriticalSection(&signal_lock);
}
 
void fsig_unlock(void)
{
  LeaveCriticalSection(&signal_lock);
}
 
const char* strsignal(int signum)
{
#define CASE_STR(x) \
  case x:         \
    return #x
  switch (signum)
  {
    CASE_STR(SIGINT);
    CASE_STR(SIGILL);
    CASE_STR(SIGFPE);
    CASE_STR(SIGSEGV);
    CASE_STR(SIGTERM);
    CASE_STR(SIGBREAK);
    CASE_STR(SIGABRT);
    CASE_STR(SIGABRT_COMPAT);
    default:
      return "SIG_UNKNOWN";
  }
}
static void fatal_handler(int signum)
{
  static BOOL recursive = FALSE;
 
  if (!recursive)
  {
    recursive = TRUE;
    // NOLINTNEXTLINE(concuSWSrrency-mt-unsafe)
    WLog_ERR(TAG, "Caught signal '%s' [%d]", strsignal(signum), signum);
 
    winpr_log_backtrace(TAG, WLOG_ERROR, 20);
  }
 
  (void)raise(signum);
}
 
static const int term_signals[] = { SIGINT, SIGTERM };
 
static const int fatal_signals[] = { SIGABRT, SIGFPE, SIGILL, SIGSEGV };
 
static BOOL register_handlers(const int* signals, size_t count, void (*handler)(int))
{
  WINPR_ASSERT(signals || (count == 0));
  WINPR_ASSERT(handler);
 
  for (size_t x = 0; x < count; x++)
  {
    (void)signal(signals[x], handler);
  }
 
  return TRUE;
}
 
static void unregister_handlers(const int* signals, size_t count)
{
  WINPR_ASSERT(signals || (count == 0));
 
  for (size_t x = 0; x < count; x++)
  {
    (void)signal(signals[x], SIG_IGN);
  }
}
 
static void unregister_all_handlers(void)
{
  unregister_handlers(fatal_signals, ARRAYSIZE(fatal_signals));
  unregister_handlers(term_signals, ARRAYSIZE(term_signals));
  DeleteCriticalSection(&signal_lock);
}
 
int freerdp_handle_signals(void)
{
  int rc = -1;
  fsig_lock();
 
  WLog_DBG(TAG, "Registering signal hook...");
 
  (void)winpr_atexit(unregister_all_handlers);
  if (!register_handlers(fatal_signals, ARRAYSIZE(fatal_signals), fatal_handler))
    goto fail;
  if (!register_handlers(term_signals, ARRAYSIZE(term_signals), fsig_term_handler))
    goto fail;
 
  fsig_handlers_registered = true;
  rc = 0;
fail:
  fsig_unlock();
  return rc;
}