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path: root/src/main.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <error.h>
#include <fcntl.h>
#include <signal.h>
#define S0(x) (x ? x : "")
#include <dht.c>
int main (int argc, char ** argv) {
	int r = 0;
	if (argc != 1+1)
		error_at_line(1, 0, __FILE__, __LINE__, "%s configfile.ben", S0(argv[0]));
	int cf = open(argv[1], O_RDWR | O_CLOEXEC | O_CREAT, 00664);
	if (cf == -1)
		error_at_line(2, errno, __FILE__, __LINE__, "open(%s)", argv[1]);
	struct stat statbuf;
	if (fstat(cf, &statbuf) == -1) {
		error_at_line(0, errno, __FILE__, __LINE__, "fstat(cf, &statbuf)");
		r = 3;
		goto r;
	}
	char * cfr = NULL;
	if (statbuf.st_size && !(cfr = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, cf, 0))) {
		error_at_line(0, errno, __FILE__, __LINE__, "mmap(NULL, %ld, PROT_READ, MAP_SHARED, cf, 0)", statbuf.st_size);
		r = 4;
		goto r;
	}
	struct bencoding * config = bdecode(cfr, statbuf.st_size, replace);
	struct dht * dht = dht_init(config);
	free_bencoding(config);
	config = persistent(dht);
	dht_free(dht);
	if (cfr && munmap(cfr, statbuf.st_size) == -1) {
		error_at_line(0, errno, __FILE__, __LINE__, "munmap(cf, %ld)", statbuf.st_size);
		r = 105;
		goto r;
	}
	cfr = NULL;
	if (ftruncate(cf, (statbuf.st_size = bencode_length(config))) == -1) {
		error_at_line(0, errno, __FILE__, __LINE__, "ftruncate(cf, %ld)", statbuf.st_size);
		r = 106;
		goto r;
	}
	if (!(cfr = mmap(NULL, statbuf.st_size, PROT_WRITE, MAP_SHARED, cf, 0))) {
		error_at_line(0, errno, __FILE__, __LINE__, "mmap(NULL, %ld, PROT_READ, MAP_SHARED, cf, 0)", statbuf.st_size);
		r = 107;
		goto r;
	}
	bencode(cfr, config);
	free_bencoding(config);
	r:
	if (cfr && munmap(cfr, statbuf.st_size) == -1)
		error_at_line(0, errno, __FILE__, __LINE__, "munmap(cf, %ld)", statbuf.st_size);
	if (close(cf) == -1)
		error_at_line(0, errno, __FILE__, __LINE__, "close(cf)");
	return r;
}