Annotation of src/usr.bin/tmux/buffer-poll.c, Revision 1.4
1.4 ! nicm 1: /* $OpenBSD: buffer-poll.c,v 1.3 2009/10/10 15:03:01 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
1.4 ! nicm 28: buffer_poll(int fd, int events, struct buffer *in, struct buffer *out)
1.1 nicm 29: {
30: ssize_t n;
31:
1.4 ! nicm 32: if (events & (POLLERR|POLLNVAL))
1.1 nicm 33: return (-1);
1.4 ! nicm 34: if (in != NULL && events & POLLIN) {
1.1 nicm 35: buffer_ensure(in, BUFSIZ);
1.4 ! nicm 36: n = read(fd, BUFFER_IN(in), BUFFER_FREE(in));
1.1 nicm 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);
1.4 ! nicm 44: } else if (events & POLLHUP)
1.3 nicm 45: return (-1);
1.4 ! nicm 46: if (out != NULL && BUFFER_USED(out) > 0 && events & POLLOUT) {
! 47: n = write(fd, BUFFER_OUT(out), BUFFER_USED(out));
1.1 nicm 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: }