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/* Copyright (c) 2018, Curtis McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sysexits.h>
#include <unistd.h>
static struct {
int read;
int write;
} fd;
static void sigwinch() {
struct winsize window;
int error = ioctl(STDERR_FILENO, TIOCGWINSZ, &window);
if (error) err(EX_IOERR, "TIOCGWINSZ");
ssize_t size = write(fd.write, &window, sizeof(window));
if (size < 0) err(EX_IOERR, "write(%d)", fd.write);
if ((size_t)size < sizeof(window)) errx(EX_IOERR, "short write(%d)", fd.write);
}
int winch(void) {
int error = pipe((int *)&fd);
if (error) err(EX_OSERR, "pipe");
error = fcntl(fd.read, F_SETFD, FD_CLOEXEC);
if (error) err(EX_IOERR, "fcntl");
error = fcntl(fd.write, F_SETFD, FD_CLOEXEC);
if (error) err(EX_IOERR, "fcntl");
struct sigaction action = {
.sa_handler = sigwinch,
.sa_flags = SA_RESTART,
};
error = sigaction(SIGWINCH, &action, NULL);
if (error) err(EX_OSERR, "sigaction");
return fd.read;
}
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