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dd36982ad5
Initial changes to move tmux to libevent. This moves the client-side loops are pretty much fully over to event-based only (tmux.c and client.c) but server-side (server.c and friends) treats libevent as a sort of clever poll, waking up after every event to run various things. Moving the server stuff over to bufferevents and timers and so on will come later.
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* $Id: buffer-poll.c,v 1.19 2009-11-08 22:40:36 tcunha Exp $ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <event.h>
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#include <unistd.h>
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#include "tmux.h"
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/* Fill buffers from socket based on poll results. */
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int
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buffer_poll(int fd, int events, struct buffer *in, struct buffer *out)
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{
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ssize_t n;
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if (in != NULL && events & EV_READ) {
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buffer_ensure(in, BUFSIZ);
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n = read(fd, BUFFER_IN(in), BUFFER_FREE(in));
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if (n == 0)
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return (-1);
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if (n == -1) {
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if (errno != EINTR && errno != EAGAIN)
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return (-1);
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} else
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buffer_add(in, n);
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}
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if (out != NULL && BUFFER_USED(out) > 0 && events & EV_WRITE) {
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n = write(fd, BUFFER_OUT(out), BUFFER_USED(out));
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if (n == -1) {
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if (errno != EINTR && errno != EAGAIN)
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return (-1);
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} else
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buffer_remove(out, n);
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}
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return (0);
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}
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