sighand.c File Reference

#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <execinfo.h>
#include "log.h"
#include "sighand.h"
#include "utils.h"
#include "string.h"
#include <openvas/base/pidfile.h>

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Functions
void	let_em_die (int pid)
void	make_em_die (int sig)
void	sighand_chld (pid_t pid)
void	sighand_segv (int given_signal)

Variables
void(*)(int)	openvas_signal (int signum, void(*handler)(int))

Function Documentation

let_em_die()

void let_em_die

(

int

pid

)

Definition at line 44 of file sighand.c.

Referenced by make_em_die().

{
  int status;

  waitpid (pid, &status, WNOHANG);
}

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make_em_die()

void make_em_die

(

int

sig

)

Definition at line 53 of file sighand.c.

References let_em_die().

{
  /* number of times, the sig is sent at most */
  int n = 3;

  /* leave if we are session leader */
  if (getpgrp () != getpid ())
    return;

  /* quickly send signals and check the result */
  if (kill (0, sig) < 0)
    return;
  let_em_die (0);
  if (kill (0, 0) < 0)
    return;

  do
    {
      /* send the signal to everybody in the group */
      if (kill (0, sig) < 0)
        return;
      sleep (1);
      /* do not leave a zombie, hanging around if possible */
      let_em_die (0);
    }
  while (--n > 0);

  if (kill (0, 0) < 0)
    return;

  kill (0, SIGKILL);
  sleep (1);
  let_em_die (0);
}

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sighand_chld()

void sighand_chld

(

pid_t

pid

)

Definition at line 109 of file sighand.c.

{
  int status;

  waitpid (pid, &status, WNOHANG);
}

sighand_segv()

void sighand_segv

(

int

given_signal

)

Definition at line 145 of file sighand.c.

{
  signal (SIGSEGV, _exit);
  print_trace ();
  make_em_die (SIGTERM);
  /* Raise signal again, to exit with the correct return value,
   * and to enable core dumping. */
  openvas_signal (given_signal, SIG_DFL);
  raise (given_signal);
}

Variable Documentation

openvas_signal

void(*)(int) openvas_signal(int signum, void(*handler)(int))

Definition at line 92 of file sighand.c.

{
  struct sigaction saNew, saOld;

  /* Init new handler */
  sigfillset (&saNew.sa_mask);
  sigdelset (&saNew.sa_mask, SIGALRM);  /* make sleep() work */

  saNew.sa_flags = 0;
  saNew.sa_handler = handler;

  sigaction (signum, &saNew, &saOld);
  return saOld.sa_handler;
}