2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
6 * This software was developed by Pawel Jakub Dawidek under sponsorship from
7 * the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
35 #include <sys/socket.h>
45 #include "proto_impl.h"
47 /* Maximum size of packet we want to use when sending data. */
49 #define MAX_SEND_SIZE 32768
53 blocking_socket(int sock)
57 flags = fcntl(sock, F_GETFL);
58 PJDLOG_ASSERT(flags >= 0);
59 return ((flags & O_NONBLOCK) == 0);
63 proto_descriptor_send(int sock, int fd)
65 unsigned char ctrl[CMSG_SPACE(sizeof(fd))];
69 PJDLOG_ASSERT(sock >= 0);
70 PJDLOG_ASSERT(fd >= 0);
72 bzero(&msg, sizeof(msg));
73 bzero(&ctrl, sizeof(ctrl));
77 msg.msg_control = ctrl;
78 msg.msg_controllen = sizeof(ctrl);
80 cmsg = CMSG_FIRSTHDR(&msg);
81 cmsg->cmsg_level = SOL_SOCKET;
82 cmsg->cmsg_type = SCM_RIGHTS;
83 cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
84 bcopy(&fd, CMSG_DATA(cmsg), sizeof(fd));
86 if (sendmsg(sock, &msg, 0) == -1)
93 proto_common_send(int sock, const unsigned char *data, size_t size, int fd)
99 PJDLOG_ASSERT(sock >= 0);
102 /* The caller is just trying to decide about direction. */
104 PJDLOG_ASSERT(size == 0);
106 if (shutdown(sock, SHUT_RD) == -1)
111 PJDLOG_ASSERT(data != NULL);
112 PJDLOG_ASSERT(size > 0);
115 sendsize = size < MAX_SEND_SIZE ? size : MAX_SEND_SIZE;
116 done = send(sock, data, sendsize, MSG_NOSIGNAL);
119 } else if (done == -1) {
122 if (errno == ENOBUFS) {
124 * If there are no buffers we retry.
125 * After each try we increase delay before the
126 * next one and we give up after fifteen times.
127 * This gives 11s of total wait time.
129 if (errcount == 15) {
130 pjdlog_warning("Getting ENOBUFS errors for 11s on send(), giving up.");
133 pjdlog_warning("Got ENOBUFS error on send(), retrying for a bit.");
135 usleep(100000 * errcount);
140 * If this is blocking socket and we got EAGAIN, this
141 * means the request timed out. Translate errno to
142 * ETIMEDOUT, to give administrator a hint to
143 * eventually increase timeout.
145 if (errno == EAGAIN && blocking_socket(sock))
153 pjdlog_info("Data sent successfully after %d ENOBUFS error%s.",
154 errcount, errcount == 1 ? "" : "s");
159 return (proto_descriptor_send(sock, fd));
163 proto_descriptor_recv(int sock, int *fdp)
165 unsigned char ctrl[CMSG_SPACE(sizeof(*fdp))];
167 struct cmsghdr *cmsg;
169 PJDLOG_ASSERT(sock >= 0);
170 PJDLOG_ASSERT(fdp != NULL);
172 bzero(&msg, sizeof(msg));
173 bzero(&ctrl, sizeof(ctrl));
177 msg.msg_control = ctrl;
178 msg.msg_controllen = sizeof(ctrl);
180 if (recvmsg(sock, &msg, 0) == -1)
183 cmsg = CMSG_FIRSTHDR(&msg);
184 if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET ||
185 cmsg->cmsg_type != SCM_RIGHTS) {
188 bcopy(CMSG_DATA(cmsg), fdp, sizeof(*fdp));
194 proto_common_recv(int sock, unsigned char *data, size_t size, int *fdp)
198 PJDLOG_ASSERT(sock >= 0);
201 /* The caller is just trying to decide about direction. */
203 PJDLOG_ASSERT(size == 0);
205 if (shutdown(sock, SHUT_WR) == -1)
210 PJDLOG_ASSERT(data != NULL);
211 PJDLOG_ASSERT(size > 0);
214 done = recv(sock, data, size, MSG_WAITALL);
215 } while (done == -1 && errno == EINTR);
218 } else if (done == -1) {
220 * If this is blocking socket and we got EAGAIN, this
221 * means the request timed out. Translate errno to
222 * ETIMEDOUT, to give administrator a hint to
223 * eventually increase timeout.
225 if (errno == EAGAIN && blocking_socket(sock))
231 return (proto_descriptor_recv(sock, fdp));