Annotation of src/usr.bin/tmux/buffer-poll.c, Revision 1.3
1.3 ! nicm 1: /* $OpenBSD: buffer-poll.c,v 1.2 2009/06/25 06:05:47 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15: * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16: * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #include <sys/types.h>
20:
21: #include <errno.h>
22: #include <unistd.h>
23:
24: #include "tmux.h"
25:
26: /* Fill buffers from socket based on poll results. */
27: int
28: buffer_poll(struct pollfd *pfd, struct buffer *in, struct buffer *out)
29: {
30: ssize_t n;
31:
1.3 ! nicm 32: if (pfd->revents & (POLLERR|POLLNVAL))
1.1 nicm 33: return (-1);
1.3 ! nicm 34: if (in != NULL && pfd->revents & POLLIN) {
1.1 nicm 35: buffer_ensure(in, BUFSIZ);
36: n = read(pfd->fd, BUFFER_IN(in), BUFFER_FREE(in));
37: if (n == 0)
38: return (-1);
39: if (n == -1) {
40: if (errno != EINTR && errno != EAGAIN)
41: return (-1);
42: } else
43: buffer_add(in, n);
1.3 ! nicm 44: } else if (pfd->revents & POLLHUP)
! 45: return (-1);
! 46: if (out != NULL && BUFFER_USED(out) > 0 && pfd->revents & POLLOUT) {
1.1 nicm 47: n = write(pfd->fd, BUFFER_OUT(out), BUFFER_USED(out));
48: if (n == -1) {
49: if (errno != EINTR && errno != EAGAIN)
50: return (-1);
51: } else
52: buffer_remove(out, n);
53: }
54: return (0);
55: }