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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file base.c
* #brief Implementation of base IO functions.
*/
#include <hicn/util/log.h>
#include "base.h"
/**
* @brief Helper function for listener to read a single packet on a socket
*/
ssize_t io_read_single_fd(int fd, msgbuf_t * msgbuf, address_t * address)
{
uint8_t * packet = msgbuf_get_packet(msgbuf);
size_t size = msgbuf_get_len(msgbuf);
for(;;) {
ssize_t n = read(fd, packet, size);
if (n == 0)
return n;
if (n < 0) {
if (errno == EINTR)
continue; // XXX was break;
ERROR("read failed %d: (%d) %s", fd, errno, strerror(errno));
return -1;
}
msgbuf->length = n;
*address = ADDRESS_ANY(AF_UNSPEC, 0); // XXX placeholder, see hicn.c
}
return 1;
}
ssize_t io_read_single_socket(int fd, msgbuf_t * msgbuf, address_t * address)
{
struct sockaddr_storage * sa = (struct sockaddr_storage *)address;
socklen_t sa_len = sizeof(sa);
uint8_t * packet = msgbuf_get_packet(msgbuf);
for (;;) {
ssize_t n = recvfrom(fd, packet, MTU, 0, (struct sockaddr *)&sa, &sa_len);
if (n == 0)
return n;
if (n < 0) {
if (errno == EINTR)
continue; // XXX was break;
ERROR("recvfrom failed %d: (%d) %s", fd, errno, strerror(errno));
return -1;
}
msgbuf->length = n;
}
return 1;
}
#ifdef __linux__
ssize_t io_read_batch_socket(int fd, msgbuf_t ** msgbuf,
address_t ** address, size_t batch_size)
{
struct mmsghdr msghdr[batch_size];
struct iovec iovecs[batch_size];
struct sockaddr_storage addrs[batch_size];
/* Prepare the mmghdr struct for recvmmsg */
for (unsigned i = 0; i < MAX_MSG; i++) {
struct mmsghdr *msg = &msghdr[i];
*msg = (struct mmsghdr) {
.msg_hdr = {
.msg_iov = &iovecs[i],
.msg_iovlen = 1,
.msg_name = &addrs[i],
.msg_namelen = sizeof(struct sockaddr_storage),
.msg_control = NULL,
.msg_controllen = 0,
},
};
iovecs[i] = (struct iovec) {
.iov_base = msgbuf_get_packet(msgbuf[i]),
.iov_len = MTU,
};
}
int n;
for (;;) {
n = recvmmsg(fd, msghdr, batch_size, /* flags */ 0,
/* timeout */ NULL);
if (n == 0)
return 0;
if (n < 0) {
if (errno == EINTR)
continue; // XXX was break;
ERROR("read failed %d: (%d) %s", fd, errno, strerror(errno));
return (ssize_t) n;
}
/* Assign size to msgbuf, and build address pair */
for (int i = 0; i < n; i++) {
struct mmsghdr *msg = &msghdr[i];
msgbuf[i]->length = msg->msg_hdr.msg_iovlen;
**address = *(address_t*)msg->msg_hdr.msg_name;
}
}
return n;
}
#endif /* __linux__ */
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