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/*
* Live variable collector
* Copyright (C) 2024-2025 Nguyễn Gia Phong
*
* This file is part of taosc.
*
* Taosc is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Taosc 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with taosc. If not, see <https://www.gnu.org/licenses/>.
*/
#include "stdlib.c"
static uint32_t stack_size;
static int output_file = -1;
/*
* Get an environment variable and parse as a number.
* Return 0 on error.
*/
uint32_t getenvul(const char *name)
{
const char *const str = getenv(name);
if (str == NULL)
return 0ULL;
errno = 0;
const uint32_t ul = strtoul(str, NULL, 0);
if (errno)
return 0ULL;
return ul;
}
void init(int argc, const char *const *argv, char **envp)
{
environ = envp;
stack_size = getenvul("TAOSC_STACK_SIZE");
const char *const path = getenv("TAOSC_OUTPUT");
if (path != NULL)
output_file = open(path, O_WRONLY | O_CREAT, 0644);
if (output_file == -1) {
const char *msg = "cannot open $TAOSC_OUTPUT for writing\n";
write(2, msg, strlen(msg));
fsync(2);
exit(128);
}
}
void log(const struct STATE *state)
{
static mutex_t mutex = MUTEX_INITIALIZER;
while (mutex_lock(&mutex) < 0);
write(output_file, (const char *)state, sizeof(struct STATE));
write(output_file, (const char *)state->rsp, stack_size);
fsync(output_file);
mutex_unlock(&mutex);
}
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