Re: hack to run ferret on RO FS. (Was Re: Ferret open .jnl file rw ?)

[Olivier ARCHER <olivier.archer@xxxxxxxxxx>]

Hi,
		I really would like to have access to ferret source code to try to 
handle the EROFS error corectly. Ferret sources are not avialable at 
http://ferret.pmel.noaa.gov/Ferret/Downloads/linux_downloads.html and I 
have no more mail adresses than contact_ferret@pmel.noaa.gov and 
ferret_users@ferret.wrc.noaa.gov.

Can someone tell me someone to contact to send me the source so I can 
patch it ?

--
Olivier


Olivier Archer wrote:
> Hi,
>    I've *temporary* solved my problem, with a so ugly hack:
> I've overload the fopen libc function to set errno whith EACCES when it 
> is EROFS...
>
> #include <stdlib.h>
> #include <dlfcn.h>
> #include <signal.h>
> #include <errno.h>
>
>
> FILE *fopen(const char *path, const char *mode){
>        static FILE *(*RealFopen)(const char *path, const char *mode)=0;
>        FILE *fid;
>
>
>  // set it up only once
>  if (!RealFopen){
>    RealFopen=dlsym(((void *) -1l), "fopen");
>    if (!RealFopen){
>      fprintf(stderr, "Fatal error - cannot find fopen()\n");
>      abort();
>    }
>  }
>
>  fid= RealFopen(path,mode);
>    /* force errno to be EACCES if it is EROFS */
>  if( (fid == NULL) && ( errno == EROFS ) ){ errno=EACCES; }
>  return fid;
> }
>
> %gcc -o fopen.so -shared fopen.c
> %setenv LD_PRELOAD fopen.so
> %ferret
>
> This hack permit me go ahead with LAS, but I think something is doable 
> source side...