Ian Tighe `wrote: > Hi , > I am using readdir with a view to selecting files for opening and > reading or just taking a stat of them. I am doing this recursively. I > test the output from readdir to see if its a file or dir or link etc > and this works well. This suddenly changes though and an item is > returned by readdir (that is a filename) but its type cannot be > determined - it is not of any type at all! So looking at a wireshark > trace revealed there had been a sharing violation but I was blissfully > unaware of this. > > I am seeking to have such an error condition made available so that > ANY i/o op can be tested not just for true or false but to further > establish the i/o outcome and hence track sharing violations amongst > other errors. Apart from the type issue above, my substantive point > about readdir was this: If I get a false reply I am not sure if I had > a failed i/o operation or I had come to the end of a directory list. > As far as I can see ( and I may be wrong of course ) there is for PHP > no difference between the two but the impact is significantly > different. It was more to demonstrate that error reporting is fairly > clumsy in these circumstances. The readdir() system call doesn't have a better error checking. It will return a null pointer on error, just as on eof. The only way to check if it had an error is by setting errno to 0 before the call and checking its status after it. And the reported shouldn't happen anyway, since they are application errors (passing a bad fd...) not reading problems.
Perhaps the sharing violation should be reported by stat() instead of readdir()? > It is certainly true all the files I have seen so far that cause this > problem related to either iTunes or Microsoft - especially internet > explorer 8 recovery files. It must be they are exclusively locked and > any attempt by my software makes to read them brings about a violation > which cannot be detected, cannot be recovered from and thus not > handled by me. > > I cannot reliably repeat it as I can barely detect it other than my > software will carry on looking for files and directories and not being > able to recognise types and actions I wanted are not carried out. I > have a wireshark trace of the smb protocol exchanges if that helps but > it basically says trans2 query path request, trans2 query path > response , create_andx request (which is probably a stat), which is > retried several times and finally a create andx response indicating a > sharing violation. If I could get hold of that in PHP I could > react............. > Thanks > Ian -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
