Hi,
I want to add the following feature to an application compiled with
-mno-cygwin:
Every time the application is about to make a system call with a
pathname as argument the application should convert the (possibly
cygwin/unix) path to the corresponding windows path using
cygwin_conv_to_full_win32_path provided by cygwin1.dll, but only if
cygwin1.dll is present on the current host.
In order to do that I need to link cygwin1.dll at runtime and get a
pointer to cygwin_conv_to_full_win32_path. I tried to do this by just
using LoadLibrary/GetProcAddress/FreeLibrary provided by Windows.
However, the application crashes. Gdb tells:
Program received signal SIGSEGV, Segmentation fault.
0x61051931 in getpass ()
(gdb) bt
#0 0x61051931 in getpass ()
#1 0x6104f268 in getpass ()
#2 0x61056629 in cygwin_conv_to_full_win32_path ()
#3 0x00401423 in main (argc=2, argv=0x3f24e8) at t.c:21
Maybe I am missing a call to an initialization routine. Here is a
complete compilable example:
#include <stdio.h>
#include <Windows.h>
typedef void (*conv_fun_t) (const char*, char*);
int main(int argc, char* argv[])
{
if (argc!=2) { fprintf(stderr,"fucking arguments\n"); return 1; }
const char* input_path= argv[1];
HMODULE libcygwin;
conv_fun_t cygwin_conv_to_full_win32_path;
libcygwin= LoadLibrary("cygwin1.dll");
if (libcygwin==NULL) { fprintf(stderr,"fuck1\n"); return 1; }
cygwin_conv_to_full_win32_path=
(conv_fun_t)(GetProcAddress(libcygwin,"cygwin_conv_to_full_win32_path"));
if (cygwin_conv_to_full_win32_path==NULL) { fprintf(stderr,"fuck2\n"); return 1; };
char *windows_path= malloc(sizeof(char)*(MAX_PATH+1));
fprintf(stderr,"calling cygwin-conv on '%s'\n", input_path);
cygwin_conv_to_full_win32_path(input_path,windows_path);
printf(windows_path);
FreeLibrary(libcygwin);
return 0;
}
I compiled the program with
gcc -mno-cygwin -g -o t t.c
Any ideas?