Mail Archives: cygwin/2003/04/01/15:45:32
I am able to open a file and write into it from a console application,
but the same fails when done from within a function that is stored in
a DLL and called from a Visual Basic application.
This is the console app:
,----
| #include <fcntl.h>
|
| int main (int argc, char * argv[]) {
| int fd;
| char *msg = "Hello, world\n";
|
| fd = open ("file.txt", O_CREAT | O_RDWR);
| if (fd == -1) {
| perror ("open()");
| exit (-1);
| }
|
| write (fd, msg, strlen (msg));
| }
`----
And this is the source of foo.dll:
,----
| #include <fcntl.h>
|
| int WINAPI DllMain (HINSTANCE H, DWORD d, PVOID p) {
| return TRUE;
| }
|
| int OpenSomething () {
| int fd;
|
| char *msg = "Hello, world\n";
|
| fd = open ("file.txt", O_CREAT | O_RDWR);
| if (fd == -1) {
| perror ("open()");
| exit (-1);
| }
|
| write (fd, msg, strlen (msg));
| return TRUE;
| }
`----
The DLL is compiled with (found in the archives):
$(LD) --dll --subsystem windows -e _DllMain AT 12 -o jnk --base-file foo.base \
foo.o -L $(LIB)/w32api -luser32 -c
$(DLLTOOL) --dllname foo.dll --base-file foo.base --def foo.def --output-lib \
foo.a --output-exp foo.exp
$(LD) --dll --subsystem windows -e _DllMain AT 12 -o foo.dll foo.o -L \
$(LIB)/w32api -luser32 -c foo.exp
rm jnk foo.base foo.exp
When run under Wine, the VB app hangs on the open() and causes this:
err:ntdll:RtlpWaitForCriticalSection section 0x610d1ef8 "?" wait timed out,
retrying (60 sec) tid=080771f8
When run on a w98 box, it crashes on the open() with an ``Invalid Page
Fault'' (sort of, I'm translating from Italian).
The console application works just fine both on the box and under
Wine. What am I missing?
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