posix_pathconf constants

## posix_pathconf() constants

`POSIX_PC_LINK_MAX` (int)
  The maximum number of links a given file or directory can have. Available as of PHP 8.3.0.
`POSIX_PC_MAX_CANON` (int)
  The maximum number of bytes in a terminal canonical input buffer (pathname being then a character special file). Available as of PHP 8.3.0.
`POSIX_PC_MAX_INPUT` (int)
  The maximum number of bytes of a terminal input queue (pathname being then a character special file). Available as of PHP 8.3.0.
`POSIX_PC_NAME_MAX` (int)
  The maximum number of characters for a file name alone, not its path. Available as of PHP 8.3.0.
`POSIX_PC_PATH_MAX` (int)
  The maximum number of characters for a full path name. Available as of PHP 8.3.0.
`POSIX_PC_PIPE_BUF` (int)
  The maximum number of bytes that can be written to a pipe in one operation. Available as of PHP 8.3.0.
`POSIX_PC_CHOWN_RESTRICTED` (int)
  If privileges are required to be allow chown() to work. Available as of PHP 8.3.0.
`POSIX_PC_NO_TRUNC` (int)
  If a file name (or files under a directory) is longer than `POSIX_PC_NAME_MAX`. Available as of PHP 8.3.0.
`POSIX_PC_ALLOC_SIZE_MIN` (int)
  The minimum number of bytes of storage allocated for any portion of a file. Available as of PHP 8.3.0.
`POSIX_PC_ALLOC_SYMLINK_MAX` (int)
  The maximum number of symbolic links a given file or directory can have. Available as of PHP 8.3.0.
`POSIX_PC_SYMLINK_MAX` (int)
  The maximum number of bytes in a symbolic link. Available as of PHP 8.3.0.

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