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/* $Id: ftpsigs.c,v 1.5 2001/05/28 09:53:44 mhe Exp $
*
* ftpsigs.c -- handles signals
*
* Yet Another FTP Client
* Copyright (C) 1998-2001, Martin Hedenfalk <mhe@stacken.kth.se>
*
* 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. See COPYING for more details.
*/
#include "syshdr.h"
#include "ftp.h"
#include "ftpsigs.h"
#include "gvars.h"
#include "transfer.h"
/* in cmd.c */
void exit_yafc(void);
void ftp_set_signal_with_mask(int signum, sighandler_t handler, int onesig)
{
int saved_errno = errno;
#ifdef HAVE_POSIX_SIGNALS
struct sigaction sa;
sigset_t ss;
/* unblock this signal */
sigemptyset(&ss);
sigaddset(&ss, signum);
sigprocmask(SIG_UNBLOCK, &ss, 0);
/* set the signal handler */
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
if(onesig)
sigaddset(&sa.sa_mask, onesig); /* a signal to exclude */
sa.sa_flags = 0;
#ifdef SA_RESTART
sa.sa_flags |= SA_RESTART;
#endif
# if 0 /* this causes segfaults!? */
if(signum == SIGALRM) {
# ifdef SA_INTERRUPT
sa.sa_flags |= SA_INTERRUPT; /* old, obsolete flag? */
# endif
} else {
# ifdef SA_RESTART
sa.sa_flags |= SA_RESTART;
# endif
}
# endif
/* sa.sa_restorer = 0;*/
if(sigaction(signum, &sa, 0) != 0)
ftp_trace("couldn't set signalhandler for signal %d\n", signum);
#else
signal(signum, handler);
#endif
errno = saved_errno;
}
void ftp_set_signal(int signum, sighandler_t handler)
{
ftp_set_signal_with_mask(signum, handler, 0);
}
static unsigned int sigints = 0;
RETSIGTYPE sigint_close_handler(int signum)
{
if(gvSighupReceived)
return;
ftp_trace("Interrupt received\n");
sigints++;
gvInterrupted = true;
/* close connection and restart command loop after 4 interrupts
*
* If we're in SSH mode, the interrupt signal is intercepted by
* the ssh program as well, which terminates directly. The ssh
* program is started by ssh_connect() in ssh_ftp.c by forking and
* execv'ing the program in the child process. I don't know if
* there is a way to prevent the interrupt signal to reach the ssh
* program?
*/
if(sigints >= 4 || ftp->ssh_pid) {
ftp_close();
sigints = 0;
if(gvJmpBufSet) {
ftp_trace("jumping to gvRestartJmp\n");
ftp_longjmp(gvRestartJmp, 1);
} else {
exit(17);
}
}
else if(sigints == 3) {
if(gvJmpBufSet)
ftp_err(_("OK, one more to close connection... \n"));
else
ftp_err(_("OK, one more to exit program... \n"));
}
/* disable any alarm set */
alarm(0);
ftp_set_signal(SIGALRM, SIG_DFL);
/* re-install the signal handler */
/* ftp_set_signal(SIGINT, sigint_close_handler);*/
}
RETSIGTYPE sigint_abort_handler(int signum)
{
if(gvSighupReceived)
return;
ftp_trace("Interrupt received\n");
sigints++;
gvInterrupted = true;
if(sigints >= 3 || ftp->ssh_pid) {
sigints = 0;
alarm(0);
if(gvJmpBufSet) {
ftp_trace("jumping to gvRestartJmp\n");
ftp_flush_reply();
ftp_longjmp(gvRestartJmp, 1);
} else
exit(17);
} else if(sigints == 2)
ftp_err(_("OK, one more to abort command... \n"));
/* re-install the signal handler */
/* ftp_set_signal(SIGINT, sigint_abort_handler);*/
}
RETSIGTYPE sigint_jmp_handler(int signum)
{
if(gvSighupReceived)
return;
ftp_trace("Interrupt received \n");
alarm(0);
if(gvJmpBufSet) {
ftp_trace("jumping to gvRestartJmp\n");
if(ftp->ssh_pid)
ftp_close();
ftp_longjmp(gvRestartJmp, 1);
} else {
ftp_err(_("Interrupt received, exiting... \n"));
exit(17);
}
}
#if 0
static RETSIGTYPE sighup_term_handler(int signum)
{
printf(_("SIGTERM (terminate) received, exiting...\n"));
ftp_close();
ftp_destroy(gvFtp);
gvars_destroy();
exit(19);
}
#endif
RETSIGTYPE sighup_handler(int signum)
{
ftp_set_signal(SIGINT, SIG_IGN);
ftp_set_signal(SIGHUP, sighup_handler);
if(gvSighupReceived)
return;
gvSighupReceived = true;
if(gvInTransfer)
ftp_err(_("Hangup received, continuing transfer in background...\n"));
else {
ftp_err(_("Hangup received, exiting...\n"));
exit_yafc();
}
if(transfer_init_nohup(0) != 0) {
if(transfer_init_nohup("/dev/null") != 0) {
ftp_err(_("Can't redirect output, exiting...\n"));
ftp_quit();
exit(18);
}
}
transfer_begin_nohup(0, 0);
sigints = 0;
}
int ftp_longjmp(
#ifdef HAVE_POSIX_SIGSETJMP
sigjmp_buf restart_jmp
#else
jmp_buf restart_jmp
#endif
, int arg)
{
#ifdef HAVE_POSIX_SIGSETJMP
siglongjmp(restart_jmp, 1);
#else
longjmp(restart_jmp, 1);
#endif
return 0; /* make cc happy */
}
void ftp_initsigs(void)
{
sigints = 0;
ftp_set_signal(SIGPIPE, SIG_IGN);
ftp_set_signal(SIGINT, gvSighupReceived ? SIG_IGN : sigint_jmp_handler);
ftp_set_signal_with_mask(SIGHUP, sighup_handler, SIGINT);
}
void ftp_sigint_close_reset(void)
{
sigints = 0;
ftp_initsigs();
}
void ftp_set_close_handler(void)
{
sigints = 0;
ftp_set_signal(SIGINT, gvSighupReceived ? SIG_IGN : sigint_close_handler);
}
void ftp_set_abort_handler(void)
{
sigints = 0;
ftp_set_signal(SIGINT, gvSighupReceived ? SIG_IGN : sigint_abort_handler);
}
unsigned int ftp_sigints(void)
{
return sigints;
}
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