fcntl - file control system all
fcntl(2) function. You'll
probably have to say
first to get the correct constant definitions. Argument processing and value return works just like ioctl() below. For example:
use Fcntl; fcntl($filehandle, F_GETFL, $packed_return_buffer) or die "can't fcntl F_GETFL: $!";
You don't have to check for defined() on the return from
fnctl(). Like ioctl(), it maps a
0 return from the system call into ``
0 but true'' in Perl. This string is true in boolean context and
0 in numeric context. It is also exempt from the normal -w warnings on improper numeric conversions.
Note that fcntl() will produce a fatal error if used on a machine that doesn't implement
If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.