Re: [ANet-devel] Re: File Management questions

[Chirag K. <ch...@ya...>]

On Tue, Dec 18, 2001 at 01:31:19PM -0500, Benoit Nadeau wrote:
| >Here do I assume that the path will be pre-malloc'ed or do I malloc the
| >memory required for storing the path?
| An ANetMemoryTag implies that:
| - The memory was already allocated
| - You can get the size of the allocated memory with GetMemoryBlockSize

I am not sure how ANetMemoryTag works. I don't think it's possible to
GetMemoryBlockSize() on a pointer and find out, how much memory was
allocated to it. If ANetMemoryTag was a struct of type:
{ void *ptr; int size; }, then it would work; ie. storing the size of
the memory block along with the location where it is stored.

I might be wrong. Let me know what you have thought.

| You should actually open the file only in ANetOpenFile and in
| ANetRead/WriteFile if the file was not already open. You create the file on
| the Write operation if it does not already exist.
| Look at:
| http://anet.sourceforge.net/docs/devel/lowdesign/html/group__files.html#a0

Fine. I had another suggestion: instead of return 1, 2 or 60, it would
be great if we have an error.h with either #define ERROR_FILE_BUSY 60 or
a typedef enum { ERROR_FILE_BUSY = 60 } ErrorCode; for the errors.

| There's no acutal "seek position" to remember for reads. Look at the
| description of ANetReadFile, which is the only function you can use to read
| from a file. The "startPos" has to be given explitely each time.

Fine. I didn't see that then.

| Your code has to work on Linux *only*. This means that you're not forced to
| use ANSI C functions. You can use any "Linux-native" function you want.

Cool!

| So, this means that instead of using ANSI stuff (FILE *), you can use Linux
| stuff ("fd": file descriptors, if I'm correct).

'fd' are the usual variable names. The data type is 'int'.

| file. So, what you can do is this:
| - ANetOpenFile() correctly opens the file in the proper async state.
| - ANetGetSetFileAsync(), with the set flag, checks to see if the file is
|   already open and if the async flag should change. If this is the case,
|   close the file and re-open it in the new async mode.
| - ANetRead/WriteFile assume the actual async state of the file is already
|   the same as the flag in the ANetFile structure.

All ok.

| what I did. BTW, we should always use "-Wall" with gcc; I saw
| some weird errors.

Oh! I'll take care.

| About symonds.net: Am I dreaming? Wow!

Thanx! :)

chyrag.
-- 
Chirag Kantharia, symonds.net/~chyrag/