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add new feature!
- Buffered I/O access to memory like a file

    1: #include <stdio.h>
    2: #include <fcntl.h>
    3: #include <sys/mman.h>
    4: #include <aitio.h>
    5: 
    6: 
    7: int
    8: main(int argc, char **argv)
    9: {
   10: 	FILE *f;
   11: 	char b[BUFSIZ];
   12: 	void *p = NULL;
   13: 
   14: 	if (argc < 2)
   15: 		f = io_fmapopen(NULL, 0, 0, PROT_READ | PROT_WRITE, 0, 20000);
   16: 	else
   17: 		f = io_fmapopen(argv[1], O_RDWR, 0, PROT_READ | PROT_WRITE, MAP_SHARED, 0);
   18: 	if (!f) {
   19: 		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
   20: 		return 1;
   21: 	}
   22: 
   23: 	fwrite("123456789", 10, 1, f);
   24: 	fseek(f, 0, SEEK_SET);
   25: 	fread(b, sizeof b, 1, f);
   26: 	printf("b=%s\n", b);
   27: //	fread(b, sizeof b, 1, f);
   28: 	fwrite("***", 4, 1, f);
   29: 	fwrite("*|\n", 3, 1, f);
   30: 	fseek(f, 100, SEEK_CUR);
   31: 	fwrite("oOo", 3, 1, f);
   32: 	fseek(f, -10, SEEK_END);
   33: 	fwrite("123456789", 10, 1, f);
   34: 	fseek(f, -10, SEEK_END);
   35: 	fread(b, sizeof b, 1, f);
   36: 	printf("2.b=%s\n", b);
   37: 
   38: 	fclose(f);
   39: 
   40: 	// part 2
   41: 	
   42: 	f = io_fmemopen(&p, 10000);
   43: 	if (!f) {
   44: 		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
   45: 		return 2;
   46: 	}
   47: 
   48: 	fwrite("123456789", 10, 1, f);
   49: 	fseek(f, 0, SEEK_SET);
   50: 	fread(b, sizeof b, 1, f);
   51: 	printf("b=%s\n", b);
   52: //	fread(b, sizeof b, 1, f);
   53: 	fwrite("***", 4, 1, f);
   54: 	fwrite("*|\n", 3, 1, f);
   55: 	fseek(f, 100, SEEK_CUR);
   56: 	fwrite("oOo", 3, 1, f);
   57: 	fseek(f, -10, SEEK_END);
   58: 	fwrite("123456789", 10, 1, f);
   59: 	fseek(f, -10, SEEK_END);
   60: 	fread(b, sizeof b, 1, f);
   61: 	printf("2.b=%s\n", b);
   62: 
   63: 	fclose(f);
   64: 
   65: 	// part 3
   66: 
   67: 	p = malloc(10000);
   68: 	f = io_fmemopen(&p, 10000);
   69: 	if (!f) {
   70: 		printf("Error:: #%d - %s\n", io_GetErrno(), io_GetError());
   71: 		return 3;
   72: 	}
   73: 
   74: 	fwrite("123456789", 10, 1, f);
   75: 	fseek(f, 0, SEEK_SET);
   76: 	fread(b, sizeof b, 1, f);
   77: 	printf("b=%s\n", b);
   78: //	fread(b, sizeof b, 1, f);
   79: 	fwrite("***", 4, 1, f);
   80: 	fwrite("*|\n", 3, 1, f);
   81: 	fseek(f, 100, SEEK_CUR);
   82: 	fwrite("oOo", 3, 1, f);
   83: 	fseek(f, -10, SEEK_END);
   84: 	fwrite("123456789", 10, 1, f);
   85: 	fseek(f, -10, SEEK_END);
   86: 	fread(b, sizeof b, 1, f);
   87: 	printf("2.b=%s\n", b);
   88: 
   89: 	fclose(f);
   90: 	free(p);
   91: 
   92: 	return 0;
   93: }