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/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
*
* 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 <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <unistd.h>
#include <errno.h>
#include "chat.h"
static struct {
bool wait;
bool pipe;
int fd;
} spawn;
void eventWait(const char *argv[static 2]) {
uiHide();
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (!pid) {
execvp(argv[0], (char *const *)argv);
err(EX_CONFIG, "%s", argv[0]);
}
spawn.wait = true;
}
void eventPipe(const char *argv[static 2]) {
if (spawn.pipe) {
uiLog(TagStatus, UIHot, L"event: existing pipe");
return;
}
int rw[2];
int error = pipe(rw);
if (error) err(EX_OSERR, "pipe");
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (!pid) {
close(rw[0]);
close(STDIN_FILENO);
dup2(rw[1], STDOUT_FILENO);
dup2(rw[1], STDERR_FILENO);
close(rw[1]);
execvp(argv[0], (char *const *)argv);
perror(argv[0]);
exit(EX_CONFIG);
}
close(rw[1]);
spawn.fd = rw[0];
spawn.pipe = true;
}
static void pipeRead(void) {
char buf[256];
ssize_t len = read(spawn.fd, buf, sizeof(buf) - 1);
if (len < 0) err(EX_IOERR, "read");
if (len) {
buf[len] = '\0';
len = strcspn(buf, "\n");
uiFmt(TagStatus, UIHot, "event: %.*s", (int)len, buf);
} else {
close(spawn.fd);
spawn.pipe = false;
}
}
static void sigchld(int sig) {
(void)sig;
int status;
pid_t pid = wait(&status);
if (pid < 0) err(EX_OSERR, "wait");
if (WIFEXITED(status) && WEXITSTATUS(status)) {
uiFmt(TagStatus, UIHot, "event: exit %d", WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
uiFmt(TagStatus, UIHot, "event: signal %d", WTERMSIG(status));
}
spawn.wait = false;
}
static void sigint(int sig) {
(void)sig;
input(TagStatus, "/quit");
uiExit();
exit(EX_OK);
}
void eventLoop(int ui, int irc) {
signal(SIGINT, sigint);
signal(SIGCHLD, sigchld);
struct pollfd fds[3] = {
{ irc, POLLIN, 0 },
{ ui, POLLIN, 0 },
{ -1, POLLIN, 0 },
};
for (;;) {
nfds_t nfds = 2;
if (spawn.wait) nfds = 1;
if (spawn.pipe) {
fds[2].fd = spawn.fd;
nfds = 3;
}
int ready = poll(fds, nfds, -1);
if (ready < 0) {
if (errno != EINTR) err(EX_IOERR, "poll");
uiRead();
uiDraw();
continue;
}
if (fds[0].revents) ircRead();
if (nfds > 1 && fds[1].revents) uiRead();
if (nfds > 2 && fds[2].revents) pipeRead();
if (nfds > 1) uiDraw();
}
}
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