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/*
* Copyright (C) 2023 Mikhail Burakov. This file is part of streamer.
*
* streamer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* streamer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with streamer. If not, see <https://www.gnu.org/licenses/>.
*/
#include "proto.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/uio.h>
#include <unistd.h>
#include "toolbox/utils.h"
#define UNCONST(x) ((void*)(uintptr_t)(x))
static bool DrainBuffers(int fd, struct iovec* iovec, int count) {
for (;;) {
ssize_t result = writev(fd, iovec, count);
if (result < 0) {
if (errno == EINTR) continue;
LOG("Failed to write (%s)", strerror(errno));
return false;
}
for (int i = 0; i < count; i++) {
size_t delta = MIN((size_t)result, iovec[i].iov_len);
iovec[i].iov_base = (uint8_t*)iovec[i].iov_base + delta;
iovec[i].iov_len -= delta;
result -= delta;
}
if (!result) return true;
}
}
bool WriteProto(int fd, const struct Proto* proto, const void* data) {
struct iovec iovec[] = {
{.iov_base = UNCONST(proto), .iov_len = sizeof(struct Proto)},
{.iov_base = UNCONST(data), .iov_len = proto->size},
};
if (!DrainBuffers(fd, iovec, LENGTH(iovec))) {
LOG("Failed to drain buffers");
return false;
}
return true;
}
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