read/sysread区别

use warnings;
use strict;
my $readbuff;
my $sysreadbuff;

my $readbyt = read(STDIN, $readbuff, 10);
print "read get:$readbuff\n";
print "read return:$readbyt\n";
my $sysreadbyt = sysread(STDIN, $sysreadbuff, 10);
print "sysread get:$sysreadbuff\n";
print "sysread return:$sysreadbyt\n";

sysread使用无缓冲

read使用缓冲