opendir crashes with -mno-cygwin

opendir crashes with -mno-cygwin

[Andre Bleau]

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The following very simple program segfaults in opendir when compiled with 
-mno-cygwin but runs OK when not compiled with -mno-cygwin. I tried with 
both gcc 2.95.3-1 and gcc 2.95.3-2.

/* File test_dir.c **********************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <dirent.h>

int main (int argc, char *argv[])

{

DIR *dir;
struct dirent *dp;

if (argc<2) {
         printf("test_dir directory\n");
         return 1;
}

dir = opendir(argv[1]);
if (dir==NULL) {
         printf("Error opening directory %s\n", argv[1]);
         return 2;
}

for (dp=readdir(dir); dp!=NULL; dp=readdir(dir)) {
         printf("\t%s\n", dp->d_name);
}

return 0;

}

/****************************************************************************/

When compiled with -mno-cygwin, if the directory given as an argument to 
the program does not exist, opendir returns NULL as it should. If the 
directory does exist, for example ".", opendir segfaults.

André Bleau, Cygwin's OpenGL package maintainer.

email: bleau at igb dot umontreal dot ca
(Fight SPAM: encode your email-address)


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Re: opendir crashes with -mno-cygwin

[Larry Hall (RFK Partners, Inc)]

At 10:53 AM 3/29/2001, Andre Bleau wrote:
>The following very simple program segfaults in opendir when compiled with -mno-cygwin but runs OK when not compiled with -mno-cygwin. I tried with both gcc 2.95.3-1 and gcc 2.95.3-2.
>
>/* File test_dir.c **********************************************************/
>
>#include <stdlib.h>
>#include <stdio.h>
>#include <dirent.h>
>
>int main (int argc, char *argv[])
>
>{
>
>DIR *dir;
>struct dirent *dp;
>
>if (argc<2) {
>         printf("test_dir directory\n");
>         return 1;
>}
>
>dir = opendir(argv[1]);
>if (dir==NULL) {
>         printf("Error opening directory %s\n", argv[1]);
>         return 2;
>}
>
>for (dp=readdir(dir); dp!=NULL; dp=readdir(dir)) {
>         printf("\t%s\n", dp->d_name);
>}
>
>return 0;
>
>}
>
>/****************************************************************************/
>
>When compiled with -mno-cygwin, if the directory given as an argument to the program does not exist, opendir returns NULL as it should. If the directory does exist, for example ".", opendir segfaults.


Where are you getting the implementation of opendir() for -mno-cygwin?



Larry Hall                              lhall@rfk.com
RFK Partners, Inc.                      http://www.rfk.com
118 Washington Street                   (508) 893-9779 - RFK Office
Holliston, MA 01746                     (508) 893-9889 - FAX


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Re: opendir crashes with -mno-cygwin

[Earnie Boyd]

"Larry Hall (RFK Partners, Inc)" wrote:
> 
> At 10:53 AM 3/29/2001, Andre Bleau wrote:
> >The following very simple program segfaults in opendir when compiled with -mno-cygwin but runs OK when not compiled with -mno-cygwin. I tried with both gcc 2.95.3-1 and gcc 2.95.3-2.
> >
-8<-
> >
> >When compiled with -mno-cygwin, if the directory given as an argument to the program does not exist, opendir returns NULL as it should. If the directory does exist, for example ".", opendir segfaults.
> 

Works for me.  gcc-2.95.2-9.  NT 4 sp4

> Where are you getting the implementation of opendir() for -mno-cygwin?
> 

It's a MinGW default library function.

Earnie.

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Re: opendir crashes with -mno-cygwin

[Andre Bleau]

Here is more info about the problem.

The program is built with:

gcc -g -mno-cygwin test_dir.c -o test_dir

cygcheck -v ./test_dir.exe gives:

Found: .\test_dir.exe
.\test_dir.exe- os=4.0 img=1.0 sys=4.0
   C:\WINNT\System32\KERNEL32.dll - os=5.0 img=5.0 sys=4.0
     "KERNEL32.dll" v0.0 ts=2000/5/3 19:43
     C:\WINNT\System32\NTDLL.DLL - os=5.0 img=5.0 sys=4.0
       "ntdll.dll" v0.0 ts=2000/5/23 20:17
   C:\WINNT\System32\msvcrt.dll - os=4.0 img=0.0 sys=4.0
     "MSVCRT.dll" v0.0 ts=1999/9/29 21:45
     C:\WINNT\System32\KERNEL32.dll (already done)

Use -h to see help about each section

I tried gcc 2.95.3-1 and 2.95.3-2 with both NT 4.0 SP6A and Windows 2000 SP1.

I attached a copy of the faulty executable. It has been renamed 
test_dir.bug to avoid triggering email virus filters.

At 09:46 2001-03-30 -0500, Earnie wrote:
>"Larry Hall (RFK Partners, Inc)" wrote:
> >
> > At 10:53 AM 3/29/2001, Andre Bleau wrote:
> > >The following very simple program segfaults in opendir when compiled 
> with -mno-cygwin but runs OK when not compiled with -mno-cygwin. I tried 
> with both gcc 2.95.3-1 and gcc 2.95.3-2.
> > >
>-8<-
> > >
> > >When compiled with -mno-cygwin, if the directory given as an argument 
> to the program does not exist, opendir returns NULL as it should. If the 
> directory does exist, for example ".", opendir segfaults.
> >
>
>Works for me.  gcc-2.95.2-9.  NT 4 sp4
>
> > Where are you getting the implementation of opendir() for -mno-cygwin?
> >
>
>It's a MinGW default library function.
>
>Earnie.

Right, it is from the latest mingw package for Cygwin. The include file is 
/usr/include/mingw/dirent.h and the lib is /usr/lib/mingw/libmingw32.a .