zssh-mirror/signal.c

/*
 ** signal.c for zssh
 ** 
 ** Made by Matthieu Lucotte
 ** Login   <gounter@users.sourceforge.net>
 ** 
 ** Started on  Thu Jun 29 19:10:55 2000 Matthieu Lucotte
 ** Last update Thu Oct 11 20:34:51 2001 Matthieu Lucotte
 */

#include "zssh.h"

/*
 * Note: all signal handlers should make sure they
 *	 reset themselves by calling signal() before
 *	 they exit.
 */

#ifdef DEBUG
void	print_process_status(int pid, int s)
{
   if (WIFEXITED(s))
      printf("process %i: exit value: %i\n", pid, WEXITSTATUS(s));
   if (WIFSIGNALED(s))
      printf("process %i: received signal %i\n", pid, WTERMSIG(s));
   if (WIFSTOPPED(s))
      printf("process %i: stopped by signal %i\n", pid, WSTOPSIG(s));
}

#endif 


RETSIGTYPE	sigchld_handler(sig)
int             sig;
{
   int          old_errno;
   int          pid;
   int          s;
   int		die;
   
   old_errno = errno;
   signal(SIGCHLD, sigchld_handler);
   die = 0;
   while (1)
   {
      errno = EINTR;
      pid = 0;
      while (pid <= 0 && errno == EINTR)
      {
         errno = 0;
	 pid = waitpid (WAIT_ANY, &s, WNOHANG);
      }
      if (pid <= 0)
      {
         errno = old_errno;
	 if (die)
	    done(0);
         return;
      }
#ifdef DEBUG
      print_process_status(pid, s);
#endif
      if (pid == gl_child_shell)
	 die = 1;
      if (pid == gl_child_rz)
	 gl_child_rz = 0;
   }
}

RETSIGTYPE	sigint_handler(sig)
int		sig;
{
   signal(SIGINT, sigint_handler);
   gl_repeat = 0;
   if (gl_child_rz)
   {
      kill(gl_child_rz, SIGKILL); /* SIGTERM seems to cause sz to interfere with ^Xs */
      /*                            so let's be more persuasive =) */
      gl_interrupt = 1;
   }
}

RETSIGTYPE	sigwinch_handler(sig)
int		sig;
{
   signal(SIGWINCH, sigwinch_handler);
   ioctl(0, TIOCGWINSZ, &gl_win);
   ioctl(gl_slave, TIOCSWINSZ, &gl_win);
   kill(gl_child_shell, SIGWINCH);
}