dio_open
(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_open — Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow
說明
$filename, int $flags, int $mode = 0): resourcedio_open() opens a file and returns a new file descriptor for it.
參數
-
filename -
The pathname of the file to open.
-
flags -
The
flagsparameter is a bitwise-ORed value comprising flags from the following list. This value must include one ofO_RDONLY,O_WRONLY, orO_RDWR. Additionally, it may include any combination of the other flags from this list.-
O_RDONLY- opens the file for read access. -
O_WRONLY- opens the file for write access. -
O_RDWR- opens the file for both reading and writing. -
O_CREAT- creates the file, if it doesn't already exist. -
O_EXCL- if bothO_CREATandO_EXCLare set and the file already exists, dio_open() will fail. -
O_TRUNC- if the file exists and is opened for write access, the file will be truncated to zero length. -
O_APPEND- write operations write data at the end of the file. -
O_NONBLOCK- sets non blocking mode. -
O_NOCTTY- prevent the OS from assigning the opened file as the process's controlling terminal when opening a TTY device file.
-
-
mode -
If
flagscontainsO_CREAT,modewill set the permissions of the file (creation permissions).modeis required for correct operation whenO_CREATis specified inflagsand is ignored otherwise.The actual permissions assigned to the created file will be affected by the process's umask setting as per usual.
返回值
A file descriptor or false on error.
範例
示例 #1 Opening a file descriptor
<?php
$fd = dio_open('/dev/ttyS0', O_RDWR | O_NOCTTY | O_NONBLOCK);
dio_close($fd);
?>