rem: int main(int argc,char **argv)
add: main(int argc,char **argv)
context: int main(int argc,char **argv){	int file;	// clean up (may not be necessary)	remove("__directory/1");	remove("__directory");	remove("__file");	file = open("__file",O_CREAT | O_TRUNC | O_WRONLY);	if (file < 0)		return -1;	close(file);	if (chmod("__file",0644) != 0)		printf("chmod fails: %s\n",strerror(errno));	if (mkdir("__directory",0755) != 0)		return -1;	// create a file in that directory	file = open("__directory/1",O_CREAT | O_WRONLY);	close(file);	errno = 0;	puts("rename test: Overwrite a directory with files in it");	printf("  %s\n",rename("__file","__directory") ? "Could not rename file!" : "Rename succeeded.");	printf("  errno = %d (%s)\n",errno,strerror(errno));	remove("__directory/1");	errno = 0;	// rename the file and try to remove the directory	puts("rename test: Overwrite an empty directory");	printf("  %s\n",rename("__file","__directory") ? "Could not rename file!" : "Rename succeeded.");	printf("  errno = %d (%s)\n",errno,strerror(errno));	remove("__directory");	remove("__file");	return 0;}