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// SPDX-License-Identifier: GPL-3.0-or-later
/*
* Copyright (C) 2024-Ω Miquel Sabaté Solà <mssola@mssola.com>
*
* This program 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.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <pudc/print.h>
#include <pudc/pudc.h>
#include <pudc/compiler.h>
/**
* Ensure that our current PID and TID are all 1, otherwise halt execution.
*/
void ensure_pid_tid_one(void)
{
pid_t pid, tid;
pid = getpid();
if (pid != 1) {
pr_error(true, "'pudc' is supposed to be PID 1, but it is PID %d", pid);
}
tid = gettid();
if (tid != 1) {
pr_error(true, "'pudc' is supposed to be TID 1, but it is TID %d", tid);
}
}
/**
* Ensure that the given @path is an existing directory.
*
* NOTE: this function will halt execution in case of error.
*/
void ensure_dir(const char *const path)
{
struct stat st;
int status = stat(path, &st);
if (!status) {
// Nothing to be done!
if (S_ISDIR(st.st_mode)) {
pr_debug("directory '%s' found", path);
return;
}
// It exists but it's not a directory, bail out.
pr_error(true, "'%s' exists and it's not a directory", path);
}
pr_error(true, "failed to stat '%s'", path);
}
__noreturn int main(void)
{
pr_info("starting pudc v%s", PUDC_VERSION);
/*
* Early checks.
*/
ensure_pid_tid_one();
ensure_dir("/run/pudc");
// TODO
halt();
/*
* We should never reach this point, and if we do just halt. The second
* 'halt' is just to make the compiler happy.
*/
pr_error(true, "pudc is no longer accepting requests. Halting execution..", "asd");
halt();
}
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