mirror of https://github.com/buserror/mii_emu.git
120 lines
3.4 KiB
C
120 lines
3.4 KiB
C
/*
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* mish_capture_select.c
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*
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* Copyright (C) 2020 Michel Pollet <buserror@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "mish_priv.h"
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#include "mish.h"
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/*
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* This is a select() based capture thread, it's not /ideal/ in terms of
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* performances, but it's portable and should work on OSX/BSD Linux etc.
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*/
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void *
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_mish_capture_select(
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void *param)
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{
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mish_p m = param;
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while (!(m->flags & MISH_QUIT)) {
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mish_client_p c;
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/*
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* Call each client state machine, handle new output,
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* new input, draw prompts etc etc.
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* Also allow clients to tweak their 'output request' flag here
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*/
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TAILQ_FOREACH(c, &m->clients, self)
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c->cr.process(m, c);
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fd_set r = m->select.read;
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fd_set w = m->select.write;
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struct timeval tv = { .tv_sec = 1 };
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int max = select(m->select.max, &r, &w, NULL, &tv);
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if (max == 0)
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continue;
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if (max == -1) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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// real error here?
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continue;
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}
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/* check the telnet listen socket */
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mish_telnet_in_check(m, &r);
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/*
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* Get any input from the original terminals, it has been split
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* into lines already and queue all into the main backlog.
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*/
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for (int i = 0; i < 1 + !(m->flags & MISH_CAP_NO_STDERR); i++) {
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_mish_input_read(m, &r, &m->origin[i]);
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mish_line_p l;
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while ((l = TAILQ_FIRST(&m->origin[i].backlog)) != NULL) {
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l->err = i == 1; // mark stderr as such
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TAILQ_REMOVE(&m->origin[i].backlog, l, self);
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TAILQ_INSERT_TAIL(&m->backlog.log, l, self);
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m->backlog.size++;
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m->backlog.alloc += sizeof(*l) + l->size;
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}
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}
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mish_client_p safe;
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// check if any client has input, or was closed down, and remove them
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TAILQ_FOREACH_SAFE(c, &m->clients, self, safe) {
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_mish_input_read(m, &r, &c->input);
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if (c->input.fd == -1 || (c->flags & MISH_CLIENT_DELETE))
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mish_client_delete(m, c);
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}
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unsigned int max_lines = m->backlog.max_lines;
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if (m->flags & MISH_CLEAR_BACKLOG) {
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max_lines = 1; // zero is unlimited, we don't want that
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m->flags &= ~MISH_CLEAR_BACKLOG;
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printf("Clearing backlog has %d lines\n", m->backlog.size);
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}
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/*
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* It is not enough just to remove the top lines from the backlog,
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* We also need to check all the current clients in case they have
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* a line we are going to remove in their display... We just have to
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* check the top line in this case, and 'scroll' their display to the
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* next line, if applicable
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*/
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if (max_lines && m->backlog.size > max_lines) {
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mish_line_p l;
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while ((l = TAILQ_FIRST(&m->backlog.log)) != NULL) {
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TAILQ_REMOVE(&m->backlog.log, l, self);
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m->backlog.size--;
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m->backlog.alloc -= sizeof(*l) + l->size;
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// now check the clients for this line
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TAILQ_FOREACH_SAFE(c, &m->clients, self, safe) {
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if (c->bottom == l)
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c->bottom = TAILQ_NEXT(l, self);
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if (c->sending == l)
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c->sending = TAILQ_NEXT(l, self);
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}
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free(l);
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if (m->backlog.size <= max_lines)
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break;
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}
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}
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}
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if ((m->flags & MISH_CONSOLE_TTY) &&
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tcsetattr(0, TCSAFLUSH, &m->orig_termios))
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perror("thread tcsetattr");
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/*
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* Try to be nice and tell all clients to cleanup
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*/
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mish_client_p c;
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while ((c = TAILQ_FIRST(&m->clients)) != NULL)
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mish_client_delete(m, c);
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m->flags &= ~MISH_QUIT;
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m->capture = 0; // mark the thread done
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exit(0); // this calls mish_terminate, on main thread
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// return NULL;
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}
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