ЭЛЕКТРОННАЯ БИБЛИОТЕКА КОАПП |
Сборники Художественной, Технической, Справочной, Английской, Нормативной, Исторической, и др. литературы. |
3.2.38 filenofileno This function returns the file descriptor for a filehandle. (A file descriptor is a small integer, unlike the filehandle, which is a symbol.) It returns undef if the handle is not open. It's useful for constructing bitmaps for select, and for passing to certain obscure system calls if syscall(2) is implemented. It's also useful for double-checking that the open function gave you the file descriptor you wanted - see the example under fcntl. If A caution: don't count on the association of a Perl filehandle and a
numeric file descriptor throughout the life of the program. If a file
has been closed and reopened, the file descriptor may change.
Filehandles |