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Annotation of src/usr.bin/tmux/buffer-poll.c, Revision 1.5

1.5     ! nicm        1: /* $OpenBSD: buffer-poll.c,v 1.4 2009/10/22 19:41:51 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>
1.5     ! nicm       22: #include <event.h>
1.1       nicm       23: #include <unistd.h>
                     24:
                     25: #include "tmux.h"
                     26:
                     27: /* Fill buffers from socket based on poll results. */
                     28: int
1.4       nicm       29: buffer_poll(int fd, int events, struct buffer *in, struct buffer *out)
1.1       nicm       30: {
                     31:        ssize_t n;
                     32:
1.5     ! nicm       33:        if (in != NULL && events & EV_READ) {
1.1       nicm       34:                buffer_ensure(in, BUFSIZ);
1.4       nicm       35:                n = read(fd, BUFFER_IN(in), BUFFER_FREE(in));
1.1       nicm       36:                if (n == 0)
                     37:                        return (-1);
                     38:                if (n == -1) {
                     39:                        if (errno != EINTR && errno != EAGAIN)
                     40:                                return (-1);
                     41:                } else
                     42:                        buffer_add(in, n);
1.5     ! nicm       43:        }
        !            44:        if (out != NULL && BUFFER_USED(out) > 0 && events & EV_WRITE) {
1.4       nicm       45:                n = write(fd, BUFFER_OUT(out), BUFFER_USED(out));
1.1       nicm       46:                if (n == -1) {
                     47:                        if (errno != EINTR && errno != EAGAIN)
                     48:                                return (-1);
                     49:                } else
                     50:                        buffer_remove(out, n);
                     51:        }
                     52:        return (0);
                     53: }