Am Fri, Mar 27, 2009 at 09:19:53PM +0100 schrieb Joost Bekkers: > On Fri, March 27, 2009 19:59, Tobias Rehbein wrote: > > Am Thu, Mar 26, 2009 at 10:11:28PM +0000 schrieb Bruce Cran: > >> > > Hm. Tried this and got ineresting results: > > > >> use POSIX; > >> sysopen(CD,"/dev/cd0", O_RDONLY|O_NONBLOCK) || perror("sysopen") > > works fine, but > >> use POSIX; > >> sysopen(CD,"/dev/cd0", O_RDONLY|O_NONBLOCK) > >> print "$!" > > prints "No such file or directory" > > > > Well, I think I'll have to accept that sysopen works but $! does not... > > After > > all sysopen is more important to me ;) > > As the perlvar manpage tells us: > > $! If used numerically, yields the current value of the C "errno" > variable, or in other words, if a system or library call fails, > it sets this variable. This means that the value of $! is > meaningful only immediately after a failure. > > The value of $! is NOT an indicator of success or failure. It only tells > you why something failed. If something succeeded $! is usualy left > untouched.
Yes, that sounds sensible. Thanks for clarification. -- Tobias Rehbein PGP key: 4F2AE314 server: keys.gnupg.net fingerprint: ECDA F300 1B6E 9B87 8524 8663 E8B6 3138 4F2A E314
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