4.2.1. Digital TV CA open()

4.2.1.1. Name

Digital TV CA open()

4.2.1.2. Synopsis

int open(const char *name, int flags)

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.