ZFS and pathconf(_PC_NO_TRUNC)

[Mark Blackman]

On 11 Nov 2010, at 12:06, Martin Simmons wrote:

>>>>>> On Wed, 10 Nov 2010 22:28:27 +0000, Mark Blackman said:
>> 
>> #include <unistd.h>
>> #include <stdlib.h>
>> #include <stdio.h>
>> #include <string.h>
>> #include <errno.h>
>> 
>> int main(int argc, char *argv[]){
>>  int result;
>> 
>>  result=pathconf(argv[1], _PC_NO_TRUNC);
>>  printf("for %s: no_trunc is %d\n",argv[1],result);
>>  if (result<0)
>>    perror(NULL);
>>  1;
>> }
> 
> Your call to printf is clobbering the real errno, which is EINVAL.  

Doh! thanks for pointing that out. :)

> That is an
> allowed value according to the pathconf man page:
> 
>     [EINVAL]           The implementation does not support an association of
>                        the variable name with the associated file.
> 
> So it is correct, but maybe not useful.

hmm. this is popping up in the context of building perl 5.12 on a zfs-only
filesystem. One of the POSIX::* tests fails because of the above.

- Mark