read

Read up to $nbytes bytes from $fd into $buffer.

Synopsis

use POSIX qw(read);
my $buf = "";
my $n = read($fd, $buf, 4096);

What you get back

On success, the number of bytes read (or "0 but true" for EOF); on failure, undef (with $! set). The data is written into $buffer in place — truncated or grown to match the actual read length.

Edge cases

• Partial reads are normal on pipes, sockets, and terminals; always check the return length.

Differences from upstream

Fully compatible with upstream POSIX.