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net.c
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net.c
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/*
*
* Copyright 2023 Kenichi Yasukata
*
* 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.
*
*/
static int netfd_init(const char *server_addr_str, const int server_port)
{
int sockfd;
in_addr_t server_addr;
bool is_server = true;
if (server_addr_str) {
assert(inet_pton(AF_INET, server_addr_str, &server_addr) == 1);
is_server = false;
}
{
assert((sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1);
if (is_server) {
{
int on = 1;
assert(!setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)));
}
{
int on = 1;
assert(!setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)));
}
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = htonl(INADDR_ANY),
.sin_port = htons(server_port),
};
assert(!bind(sockfd, (struct sockaddr *) &sin, sizeof(sin)));
}
assert(!listen(sockfd, SOMAXCONN));
} else {
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_addr.s_addr = server_addr,
.sin_port = htons(server_port),
};
assert(!connect(sockfd, (struct sockaddr *) &sin, sizeof(sin)));
}
}
}
return sockfd;
}