4.2.1. Digital TV CA open()¶
4.2.1.1. Name¶
Digital TV CA open()
4.2.1.3. Arguments¶
name- Name of specific Digital TV 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/dvb/adapter?/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¶
On success 0 is returned.
On error -1 is returned, and the errno variable is set
appropriately.
Generic error codes are described at the Generic Error Codes chapter.