PerlIO::scalar(3pm) Perl Programmers Reference Guide PerlIO::scalar(3pm)
NAME
PerlIO::scalar - in-memory IO, scalar IO
SYNOPSIS
my $scalar = ''; ... open my $fh, "<", \$scalar or die; open my $fh, ">", \$scalar or die; open my $fh, ">>", \$scalar or die; or my $scalar = ''; ... open my $fh, "<:scalar", \$scalar or die; open my $fh, ">:scalar", \$scalar or die; open my $fh, ">>:scalar", \$scalar or die;
DESCRIPTION
A filehandle is opened but the file operations are performed "in- memory" on a scalar variable. All the normal file operations can be performed on the handle. The scalar is considered a stream of bytes. Currently fileno($fh) returns -1. Attempting to open a read-only scalar for writing will fail, and if warnings are enabled, produce a warning.
IMPLEMENTATION NOTE
"PerlIO::scalar" only exists to use XSLoader to load C code that provides support for treating a scalar as an "in memory" file. One does not need to explicitly "use PerlIO::scalar". perl v5.34.0 2020-10-04 PerlIO::scalar(3pm)
perl 5.34.0 - Generated Thu Mar 3 16:16:29 CST 2022