141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
/* Copyright (C) 2018 Curtis McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <err.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <errno.h>
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#include "chat.h"
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static struct {
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bool wait;
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bool pipe;
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int fd;
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} spawn;
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void eventWait(char *const argv[]) {
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uiHide();
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pid_t pid = fork();
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if (pid < 0) err(EX_OSERR, "fork");
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if (!pid) {
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execvp(argv[0], argv);
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err(EX_CONFIG, "%s", argv[0]);
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}
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spawn.wait = true;
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}
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void eventPipe(char *const argv[]) {
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if (spawn.pipe) {
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uiLog(TagStatus, UIHot, L"event: existing pipe");
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return;
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}
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int rw[2];
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int error = pipe(rw);
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if (error) err(EX_OSERR, "pipe");
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pid_t pid = fork();
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if (pid < 0) err(EX_OSERR, "fork");
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if (!pid) {
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close(rw[0]);
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close(STDIN_FILENO);
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dup2(rw[1], STDOUT_FILENO);
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dup2(rw[1], STDERR_FILENO);
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close(rw[1]);
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execvp(argv[0], argv);
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perror(argv[0]);
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exit(EX_CONFIG);
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}
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close(rw[1]);
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spawn.fd = rw[0];
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spawn.pipe = true;
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}
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static void pipeRead(void) {
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char buf[256];
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ssize_t len = read(spawn.fd, buf, sizeof(buf) - 1);
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if (len < 0) err(EX_IOERR, "read");
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if (len) {
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buf[len] = '\0';
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len = strcspn(buf, "\n");
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uiFmt(TagStatus, UIHot, "event: %.*s", (int)len, buf);
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} else {
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close(spawn.fd);
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spawn.pipe = false;
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}
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}
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static void sigchld(int sig) {
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(void)sig;
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int status;
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pid_t pid = wait(&status);
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if (pid < 0) err(EX_OSERR, "wait");
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if (WIFEXITED(status) && WEXITSTATUS(status)) {
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uiFmt(TagStatus, UIHot, "event: exit %d", WEXITSTATUS(status));
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} else if (WIFSIGNALED(status)) {
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uiFmt(TagStatus, UIHot, "event: signal %d", WTERMSIG(status));
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}
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spawn.wait = false;
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}
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static void sigint(int sig) {
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(void)sig;
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input(TagStatus, "/quit");
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uiExit();
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exit(EX_OK);
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}
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void eventLoop(int ui, int irc) {
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signal(SIGINT, sigint);
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signal(SIGCHLD, sigchld);
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struct pollfd fds[3] = {
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{ irc, POLLIN, 0 },
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{ ui, POLLIN, 0 },
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{ -1, POLLIN, 0 },
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};
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for (;;) {
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nfds_t nfds = 2;
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if (spawn.wait) nfds = 1;
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if (spawn.pipe) {
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fds[2].fd = spawn.fd;
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nfds = 3;
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}
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int ready = poll(fds, nfds, -1);
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if (ready < 0) {
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if (errno != EINTR) err(EX_IOERR, "poll");
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uiRead();
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uiDraw();
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continue;
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}
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if (fds[0].revents) ircRead();
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if (nfds > 1 && fds[1].revents) uiRead();
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if (nfds > 2 && fds[2].revents) pipeRead();
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if (nfds > 1) uiDraw();
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}
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}
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