[cs631apue] Readlink errors

[yluo4]

You can use strerrno to see what the error says.


On 10/05/2013 9:11 PM, Tejas Nadkarni wrote:
> I take it back, it seems to work the first time but on future calls it
> fails! This is stumping me. Here's my code. This is called for each
> directory entry when using longformat.
> 
> char buf [PATH_MAX];
> int r=0;
> .
> .
> .
> if it's a link...
> 
> r = readlink(strcat(p->fts_path,p->fts_name),buf,sizeof(buf)-1);
> if (r>0){
>    buf[r]='';
>   printf(" %-s -> %s",p->fts_name,buf);
> }else
>   printf(" %-s -> %s",p->fts_name,"Could't read link");
> 
> Again, this works the first time it's run but after that fails!! :)
> 
> On Sat, Oct 5, 2013 at 8:59 PM, Tejas Nadkarni <tnadkarn at stevens.edu>
> wrote:
> 
>> I'm using readlink to read symlinks to determine their actual target
>> and print it out as part of the longformat. This seems to work for
>> links I create but I've run into existing symlinks that don't work
>> and I believe is a permissions issue.
>> 
>> How are you handling this? 
>> 
>> for example if I run "./ls -l /etc/" on my Ubuntu VM....
>> 
>> It works on this...
>> blkid.tab -> /dev/.blkid.tab
>> 
>> but not on this...
>> 
>> vtrgb -> Could't read link
>> 
>> and many others.
>> 
>> I've had no issues on symlinks I've created so far.
>> 
>> Thoughts?
> 
> 
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