metalsvm/newlib/examples/hello.c

/*
 * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
 *                               RWTH Aachen University
 *
 * 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.
 *
 * This file is part of MetalSVM.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>

/*file descriptor init*/
#define NR_OPEN 10
#define FS_INIT { [0 ... NR_OPEN-1] = {NULL, 0, 0} }

#define TESTSTR "hello in new file '/bin/test.txt'"

int main(int argc, char** argv)
{
	int i, testfile;
	char* teststr;
	DIR* testdir;
	dirent_t* testdirent;

	for(i=0; environ[i]; i++)
		printf("environ[%d] = %s\n", i, environ[i]);
	for(i=0; i<argc; i++)
		printf("argv[%d] = %s\n", i, argv[i]);

	teststr = malloc(sizeof(char)*100);
	if (!teststr)
		exit(1);

	testfile = open("/bin/test.txt", O_CREAT | O_EXCL, "wr");
	if (testfile < 1) {
		printf("error: Was not able to open /bin/test.txt\n");
		exit(1);
	}
	write(testfile, TESTSTR, 34);
	lseek(testfile, 0, SEEK_SET);
	read(testfile, teststr, 100);
	close(testfile);

	printf("read from new file: %s\n", teststr);

	if (strcmp(teststr, TESTSTR))
		exit(1);

	testdir = opendir("/bin/");
	if (testdir < 1) {
		printf("error: Was not able to open /bin directory");
		exit(1);
	}
	testdirent = readdir(testdir);
	printf("1. Dirent: %s\n", testdirent->d_name);
	closedir(testdir);

	return errno;
}