On 14/05/2008, at 7:54 PM, Vivian Chen wrote:
Because my library has called some standard C library functions in it. And when I debug the project, there's a crash.
As I've already said, without the actual error messages you're getting from the computer we can only guess what the problem is.
Do you have some suggetions when use the standerd C library functions in Garnet?
The short answer is "don't do it".
In "Palm OS 68K API Documentation", it says that to use Palm OS functions rather than standard C library functions directly.
...
But Palm OS functions are also based on standard C library functions. Are they?
The Palm OS functions are not based on "the standard C library". The standard C library is just an API that many systems provide. Palm OS does not provide the standard C library but it provides analogues for some of the functions.
When you build an app for Palm OS and you use standard C library functions there are 2 things you need to be aware of.
1) The function must be available. The easiest way to ensure this is to link to a static libc.
2) The function must not use kernel calls that are not provided on Palm OS. Things like string handling can be done entirely in user space but thing like malloc rely on the kernel to do their work.
If you are creating a .dll for the simulator then I'm pretty sure you must use the same standard C library that the simulator uses so you will need to confirm which one that is. It could be Cygwin, it could be the Windows C library (crt.dll) or even one of the newer Visual Studio libs (eg. msvcrt.dll).
Getting a crash using standard C library functions could indicate that you are using a function that makes kernel calls or that your C library's structures have not been initialised properly (eg. because the process that loads your .dll was using a different libc).
If you really want to use libc functions you would be better off implementing them yourself on top of the Palm OS APIs because then you would be sure that they will work identically in .dlls and as 68k or ARM code running on a device.
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