Re^3: failing to use getdents system call on Linux

Replies are listed 'Best First'.
Re^4: failing to use getdents system call on Linux by glasswalk3r (Friar) on Nov 07, 2016 at 19:07 UTC
Yup, the problem was with unpack indeed... I changed the line below from: `my ( $ino, $off, $len, $name ) = unpack( "LLSZ", $buf );` [download] To: `my ( $ino, $off, $len, $name ) = unpack( "L!L!SZ", $buf );` [download] And the program finally worked as expected: `[me@localhost ~]$ ./test2.pl -d sample/ \| head sample/xaaaaaaaaff sample/xaaaaaaabdu sample/xaaaaaaabjw sample/xaaaaaaaaos sample/xaaaaaaaalu sample/xaaaaaaaags sample/xaaaaaaabci sample/xaaaaaaabhy sample/xaaaaaaabjv sample/xaaaaaaaaxa` [download] All good, but some questions remains: What could have happened that cause this change in the system? Originally I didn't need to worry about that. Maybe some change related going from 32 to 64 bits platforms? How can I double check if I need to use "native" sizes with the unpack template? Besides the program malfunctions, of course. :-) Alceu Rodrigues de Freitas Junior --------------------------------- "You have enemies? Good. That means you've stood up for something, sometime in your life." - Sir Winston Churchill	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^4: failing to use getdents system call on Linux
by glasswalk3r (Friar) on Nov 07, 2016 at 19:07 UTC

Yup, the problem was with unpack indeed... I changed the line below from:

my ( $ino, $off, $len, $name ) = unpack( "LLSZ*", $buf );
[download]

To:

my ( $ino, $off, $len, $name ) = unpack( "L!L!SZ*", $buf );
[download]

And the program finally worked as expected:

[me@localhost ~]$ ./test2.pl -d sample/ | head
sample/xaaaaaaaaff
sample/xaaaaaaabdu
sample/xaaaaaaabjw
sample/xaaaaaaaaos
sample/xaaaaaaaalu
sample/xaaaaaaaags
sample/xaaaaaaabci
sample/xaaaaaaabhy
sample/xaaaaaaabjv
sample/xaaaaaaaaxa
[download]

All good, but some questions remains:

What could have happened that cause this change in the system? Originally I didn't need to worry about that. Maybe some change related going from 32 to 64 bits platforms?
How can I double check if I need to use "native" sizes with the unpack template? Besides the program malfunctions, of course. :-)

Alceu Rodrigues de Freitas Junior
---------------------------------
"You have enemies? Good. That means you've stood up for something, sometime in your life." - Sir Winston Churchill

[reply]
[d/l]
[select]