120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
|
|
* sighandler.c
|
|
*
|
|
* Copyright (c) 2015-2016 Pacman Development Team <pacman-dev@archlinux.org>
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
#include <alpm.h>
|
|
|
|
#include "conf.h"
|
|
#include "sighandler.h"
|
|
#include "util.h"
|
|
|
|
/** Write function that correctly handles EINTR.
|
|
*/
|
|
static ssize_t xwrite(int fd, const void *buf, size_t count)
|
|
{
|
|
ssize_t ret;
|
|
do {
|
|
ret = write(fd, buf, count);
|
|
} while(ret == -1 && errno == EINTR);
|
|
return ret;
|
|
}
|
|
|
|
/** Catches thrown signals. Performs necessary cleanup to ensure database is
|
|
* in a consistent state.
|
|
* @param signum the thrown signal
|
|
*/
|
|
static void soft_interrupt_handler(int signum)
|
|
{
|
|
if(signum == SIGINT) {
|
|
const char msg[] = "\nInterrupt signal received\n";
|
|
xwrite(STDERR_FILENO, msg, ARRAYSIZE(msg) - 1);
|
|
} else {
|
|
const char msg[] = "\nHangup signal received\n";
|
|
xwrite(STDERR_FILENO, msg, ARRAYSIZE(msg) - 1);
|
|
}
|
|
if(alpm_trans_interrupt(config->handle) == 0) {
|
|
/* a transaction is being interrupted, don't exit pacman yet. */
|
|
return;
|
|
}
|
|
alpm_unlock(config->handle);
|
|
/* output a newline to be sure we clear any line we may be on */
|
|
xwrite(STDOUT_FILENO, "\n", 1);
|
|
_Exit(128 + signum);
|
|
}
|
|
|
|
void install_soft_interrupt_handler(void)
|
|
{
|
|
struct sigaction new_action;
|
|
new_action.sa_handler = soft_interrupt_handler;
|
|
new_action.sa_flags = SA_RESTART;
|
|
sigemptyset(&new_action.sa_mask);
|
|
sigaddset(&new_action.sa_mask, SIGINT);
|
|
sigaddset(&new_action.sa_mask, SIGHUP);
|
|
|
|
sigaction(SIGINT, &new_action, NULL);
|
|
sigaction(SIGHUP, &new_action, NULL);
|
|
}
|
|
|
|
void remove_soft_interrupt_handler(void)
|
|
{
|
|
struct sigaction new_action;
|
|
sigemptyset(&new_action.sa_mask);
|
|
new_action.sa_handler = SIG_DFL;
|
|
new_action.sa_flags = 0;
|
|
sigaction(SIGINT, &new_action, NULL);
|
|
sigaction(SIGHUP, &new_action, NULL);
|
|
}
|
|
|
|
static void segv_handler(int signum)
|
|
{
|
|
const char msg[] = "\nerror: segmentation fault\n"
|
|
"Please submit a full bug report with --debug if appropriate.\n";
|
|
xwrite(STDERR_FILENO, msg, sizeof(msg) - 1);
|
|
_Exit(signum);
|
|
}
|
|
|
|
void install_segv_handler(void)
|
|
{
|
|
struct sigaction new_action;
|
|
new_action.sa_handler = segv_handler;
|
|
sigemptyset(&new_action.sa_mask);
|
|
new_action.sa_flags = SA_RESTART;
|
|
sigaction(SIGSEGV, &new_action, NULL);
|
|
}
|
|
|
|
static void winch_handler(int signum)
|
|
{
|
|
(void)signum; /* suppress unused variable warnings */
|
|
columns_cache_reset();
|
|
}
|
|
|
|
void install_winch_handler(void)
|
|
{
|
|
struct sigaction new_action;
|
|
new_action.sa_handler = winch_handler;
|
|
sigemptyset(&new_action.sa_mask);
|
|
new_action.sa_flags = SA_RESTART;
|
|
sigaction(SIGWINCH, &new_action, NULL);
|
|
}
|
|
|
|
/* vim: set noet: */
|