68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#undef errno
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extern int errno;
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/*file descriptor init*/
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#define NR_OPEN 10
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#define FS_INIT { [0 ... NR_OPEN-1] = {NULL, 0, 0} }
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/*open flags*/
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//#define O_RDONLY 0
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//#define O_WRONLY 1
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#define O_RDWR 2
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#define O_CREAT 64
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#define O_EXCL 128
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//#define O_NOCTTY 256
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#define O_TRUNC 512
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#define O_APPEND 1024
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int main(int argc, char** argv)
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{
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int i, testfile;
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char* teststr;
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for(i=0; environ[i]; i++)
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printf("environ[%d] = %s\n", i, environ[i]);
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for(i=0; i<argc; i++)
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printf("argv[%d] = %s\n", i, argv[i]);
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teststr = malloc(sizeof(char)*100);
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if (!teststr)
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return EFAULT;
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testfile = open("/bin/test.txt", O_CREAT | O_EXCL, "wr");
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write(testfile, "hello in new file '/bin/test.txt'", 34);
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lseek(testfile, 0, SEEK_SET);
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read(testfile, teststr, 100);
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close(testfile);
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printf("read from new file: %s\n", teststr);
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return errno;
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}
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