mirror of https://github.com/tmux/tmux.git
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* $Id: buffer-poll.c,v 1.18 2009-10-23 17:49:47 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 <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 (events & (POLLERR|POLLNVAL))
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return (-1);
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if (in != NULL && events & POLLIN) {
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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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} else if (events & POLLHUP)
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return (-1);
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if (out != NULL && BUFFER_USED(out) > 0 && events & POLLOUT) {
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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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