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/* $Id: buffer-poll.c,v 1.10 2008-09-09 22:16:36 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include "tmux.h"
/* Set up pollfd for buffers. */
void
buffer_set(
struct pollfd *pfd, int fd, unused struct buffer *in, struct buffer *out)
{
pfd->fd = fd;
pfd->events = POLLIN;
if (BUFFER_USED(out) > 0)
pfd->events |= POLLOUT;
}
/* Fill buffers from socket based on poll results. */
int
buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
{
ssize_t n;
#if 0
log_debug("buffer_poll (%ld): fd=%d, revents=%d; out=%zu in=%zu",
(long) getpid(),
pfd->fd, pfd->revents, BUFFER_USED(out), BUFFER_USED(in));
#endif
#ifndef BROKEN_POLL
if (pfd->revents & (POLLERR|POLLNVAL|POLLHUP))
return (-1);
#endif
if (pfd->revents & POLLIN) {
buffer_ensure(in, BUFSIZ);
n = read(pfd->fd, BUFFER_IN(in), BUFFER_FREE(in));
#if 0
log_debug("buffer_poll: fd=%d, read=%zd", pfd->fd, n);
#endif
if (n == 0)
return (-1);
if (n == -1) {
if (errno != EINTR && errno != EAGAIN)
return (-1);
} else
buffer_add(in, n);
}
if (BUFFER_USED(out) > 0 && pfd->revents & POLLOUT) {
n = write(pfd->fd, BUFFER_OUT(out), BUFFER_USED(out));
#if 0
log_debug("buffer_poll: fd=%d, write=%zd", pfd->fd, n);
#endif
if (n == -1) {
if (errno != EINTR && errno != EAGAIN)
return (-1);
} else
buffer_remove(out, n);
}
return (0);
}
/* Flush buffer output to socket. */
void
buffer_flush(int fd, struct buffer *in, struct buffer *out)
{
struct pollfd pfd;
while (BUFFER_USED(out) > 0) {
buffer_set(&pfd, fd, in, out);
if (poll(&pfd, 1, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (buffer_poll(&pfd, in, out) != 0)
break;
}
}
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