4.2.1. DVB CA open()¶
4.2.1.1. Name¶
DVB CA open()
4.2.1.3. Arguments¶
name
- Name of specific DVB CA device.
flags
- A bit-wise OR of the following flags:
O_RDONLY | read-only access |
O_RDWR | read/write access |
O_NONBLOCK | open in non-blocking mode (blocking mode is the default) |
4.2.1.4. Description¶
This system call opens a named ca device (e.g. /dev/ost/ca) for subsequent use.
When an open() call has succeeded, the device will be ready for use. The significance of blocking or non-blocking mode is described in the documentation for functions where there is a difference. It does not affect the semantics of the open() call itself. A device opened in blocking mode can later be put into non-blocking mode (and vice versa) using the F_SETFL command of the fcntl system call. This is a standard system call, documented in the Linux manual page for fcntl. Only one user can open the CA Device in O_RDWR mode. All other attempts to open the device in this mode will fail, and an error code will be returned.
4.2.1.5. Return Value¶
ENODEV |
Device driver not loaded/available. |
EINTERNAL |
Internal error. |
EBUSY |
Device or resource busy. |
EINVAL |
Invalid argument. |