Путеводитель по Руководству Linux
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   openat    ( 2 )

открыть и, возможно, создать файл (open and possibly create a file)
  Name  |  Synopsis  |  Description  |  Return value  |  Error  |  Versions  |  Conforming to  |  Note  |    Bugs    |  See also  |

Ошибки (баги) (Bugs)

Currently, it is not possible to enable signal-driven I/O by specifying O_ASYNC when calling open(); use fcntl(2) to enable this flag.

One must check for two different error codes, EISDIR and ENOENT, when trying to determine whether the kernel supports O_TMPFILE functionality.

When both O_CREAT and O_DIRECTORY are specified in flags and the file specified by pathname does not exist, open() will create a regular file (i.e., O_DIRECTORY is ignored).