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93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* $Id: buffer-poll.c,v 1.6 2008-06-18 20:11:25 nicm 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 <poll.h>
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#include <unistd.h>
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#include "tmux.h"
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/* Set up pollfd for buffers. */
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void
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buffer_set(
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struct pollfd *pfd, int fd, unused struct buffer *in, struct buffer *out)
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{
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pfd->fd = fd;
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pfd->events = POLLIN;
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if (BUFFER_USED(out) > 0)
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pfd->events |= POLLOUT;
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}
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/* Fill buffers from socket based on poll results. */
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int
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buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
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{
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ssize_t n;
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log_debug("buffer_poll (%d): fd=%d, revents=%d; out=%zu in=%zu",
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(int) getpid(),
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pfd->fd, pfd->revents, BUFFER_USED(out), BUFFER_USED(in));
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if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
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return (-1);
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if (pfd->revents & POLLIN) {
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buffer_ensure(in, BUFSIZ);
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n = read(pfd->fd, BUFFER_IN(in), BUFFER_FREE(in));
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log_debug("buffer_poll: fd=%d, read=%zd", pfd->fd, n);
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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 (BUFFER_USED(out) > 0 && pfd->revents & POLLOUT) {
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n = write(pfd->fd, BUFFER_OUT(out), BUFFER_USED(out));
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log_debug("buffer_poll: fd=%d, write=%zd", pfd->fd, n);
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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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/* Flush buffer output to socket. */
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void
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buffer_flush(int fd, struct buffer *in, struct buffer *out)
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{
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struct pollfd pfd;
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while (BUFFER_USED(out) > 0) {
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buffer_set(&pfd, fd, in, out);
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if (poll(&pfd, 1, INFTIM) == -1) {
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if (errno == EAGAIN || errno == EINTR)
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continue;
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fatal("poll failed");
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}
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if (buffer_poll(&pfd, in, out) != 0)
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break;
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}
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}
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