我正在使用 `socket_select`,但在某个主机上,该函数会发生奇怪的事情:
这里发生了什么?
更新的测试脚本:仍然在瞬间运行:
- 立即返回而不是等待5秒
- 返回 false,表明存在某些错误
- 但是 `socket_last_error()` 返回 0(表示成功)。
$server = socket_create( AF_UNIX, SOCK_STREAM, 0 );
$r = socket_bind( $server, '/some/file/somewhere');
$r = socket_listen( $server );
// none of the above socket_* returns false
$t = microtime(true);
socket_clear_error();
$read = array( $server ); $write = null; $except = null;
$read = array( $server ); $write = array(); $except = array();
$read = array(); $write = array(); $except = array();
$read = null; $write = null; $except = null;
$changed = socket_select( $read, $write, $except, 5,0 );
$changed = socket_select( $read, $write, $except, null );
$changed = socket_select( $read, $write, $except, 5000000 );
$changed = socket_select( $read, $write, $except, 5000000, 0 );
$changed = socket_select( $read, $write, $except, 5000000, 5000000 );
/* Results:
microtime(true) - $t == almost zero
$changed === false
socket_last_error() === 0
socket_strerror(socket_last_error()) === Success
$read === array(1) {
[0]=>
resource(2) of type (Socket)
}
$write === NULL
$except === NULL
*/
$s = socket_read( $server, 1024, PHP_BINARY_READ );
// $s === false
这里发生了什么?
更新的测试脚本:仍然在瞬间运行:
header('Content-Type: text/plain; charset=utf-8');
error_reporting(-1);
for( $i = 0; $i < 4; $i++ ){
for( $j = 0; $j < 5; $j++ ){
echo "\n\n\n\n\n[i,j]=[{$i},{$j}]\n";
$socket = socket_create( AF_UNIX, SOCK_STREAM, 0 );
var_dump('socket_create', $socket ); echo "\n"; if( $socket === false ) continue;
$socket_file = dirname(__FILE__)."/test_socket_i{$i}_j{$j}";
if( file_exists( $socket_file )) unlink( $socket_file );
$r = socket_bind( $socket, $socket_file );
var_dump('socket_bind', $r ); echo "\n"; if( $r === false ) continue;
$r = socket_listen( $socket );
var_dump('socket_listen', $r ); echo "\n"; if( $r === false ) continue;
$t = microtime(true);
socket_clear_error();
if($i==0){ $read = null; $write = null; $except = null; }
if($i==1){ $read = array(); $write = array(); $except = array(); }
if($i==2){ $read = array( $socket ); $write = null; $except = null; }
if($i==3){ $read = array( $socket ); $write = array(); $except = array(); }
if($j==0){ $changed = socket_select( $read, $write, $except, 5,0 ); } // 5 seconds
if($j==1){ $changed = socket_select( $read, $write, $except, null ); } // forever
if($j==2){ $changed = socket_select( $read, $write, $except, 5000000 ); }
if($j==3){ $changed = socket_select( $read, $write, $except, 5000000, 0 ); }
if($j==4){ $changed = socket_select( $read, $write, $except, 5000000, 5000000 ); }
var_dump('•socket_select returned:', $changed );echo "\n";
var_dump('•$read/$write/$except:',$read,$write,$except);echo "\n";
var_dump('•error:', socket_last_error(), socket_strerror(socket_last_error()) );echo "\n";
var_dump('time: ', microtime(true) - $t );echo "\n"; // almost zero
}}
$e = NULL; socket_select($r, $w, $e, 0);
我认为这是“禁止”的语法:socket_select($r, null, null, 0);
- biziclop