catboy/event.c

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C
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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 <assert.h>
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#include <err.h>
#include <errno.h>
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#include <poll.h>
#include <signal.h>
#include <stdbool.h>
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#include <stdio.h>
#include <stdlib.h>
#include <stdnoreturn.h>
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#include <string.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <unistd.h>
#include "chat.h"
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static struct {
bool wait;
int pipe;
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} child = {
.pipe = -1,
};
void eventWait(const char *argv[static 2]) {
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uiHide();
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (!pid) {
execvp(argv[0], (char *const *)argv);
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err(EX_CONFIG, "%s", argv[0]);
}
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child.wait = true;
}
static void childWait(void) {
uiShow();
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 %s", strsignal(WTERMSIG(status))
);
}
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child.wait = false;
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}
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void eventPipe(const char *argv[static 2]) {
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if (child.pipe > 0) {
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uiLog(TagStatus, UIHot, L"event: existing pipe");
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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);
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perror(argv[0]);
exit(EX_CONFIG);
}
close(rw[1]);
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child.pipe = rw[0];
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}
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static void childRead(void) {
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char buf[256];
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ssize_t len = read(child.pipe, buf, sizeof(buf) - 1);
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if (len < 0) err(EX_IOERR, "read");
if (len) {
buf[len] = '\0';
buf[strcspn(buf, "\n")] = '\0';
uiFmt(TagStatus, UIHot, "event: %s", buf);
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} else {
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close(child.pipe);
child.pipe = -1;
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}
}
static sig_atomic_t sig[NSIG];
static void handler(int n) {
sig[n] = 1;
}
noreturn void eventLoop(void) {
sigset_t mask;
sigemptyset(&mask);
struct sigaction action = {
.sa_handler = handler,
.sa_mask = mask,
.sa_flags = SA_RESTART | SA_NOCLDSTOP,
};
sigaction(SIGCHLD, &action, NULL);
sigaction(SIGINT, &action, NULL);
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sigaction(SIGHUP, &action, NULL);
struct sigaction curses;
sigaction(SIGWINCH, &action, &curses);
assert(!(curses.sa_flags & SA_SIGINFO));
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uiFmt(TagStatus, UICold, "Traveling to %s...", self.host);
int irc = ircConnect();
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for (;;) {
if (sig[SIGCHLD]) childWait();
if (sig[SIGHUP]) {
ircFmt("QUIT :zzz\r\n");
self.quit = true;
}
if (sig[SIGINT]) {
signal(SIGINT, SIG_DFL);
ircFmt("QUIT :Goodbye\r\n");
self.quit = true;
}
if (sig[SIGWINCH]) {
curses.sa_handler(SIGWINCH);
uiRead();
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uiDraw();
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}
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sig[SIGCHLD] = sig[SIGHUP] = sig[SIGINT] = sig[SIGWINCH] = 0;
struct pollfd fds[3] = {
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{ .events = POLLIN, .fd = irc },
{ .events = POLLIN, .fd = STDIN_FILENO },
{ .events = POLLIN, .fd = child.pipe },
};
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if (child.wait) fds[1].events = 0;
if (child.pipe < 0) fds[2].events = 0;
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int nfds = poll(fds, 3, -1);
if (nfds < 0) {
if (errno == EINTR) continue;
err(EX_IOERR, "poll");
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}
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if (fds[0].revents) ircRead();
if (fds[1].revents) uiRead();
if (fds[2].revents) childRead();
uiDraw();
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}
}