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.

int open(const char ⋆deviceName, int flags);

const char *deviceName

Name of specific video device.

int 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)

ENODEV

Device driver not loaded/available.

EINTERNAL

Internal error.

EBUSY

Device or resource busy.

EINVAL

Invalid argument.

This system call closes a previously opened audio device.

int close(int fd);

int fd

File descriptor returned by a previous call to open().

EBADF

fd is not a valid open file descriptor.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_RESET);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_RESET for this command.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_GET_CAP, ca_caps_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_GET_CAP for this command.

ca_caps_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_GET_SLOT_INFO, ca_slot_info_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_GET_SLOT_INFO for this command.

ca_slot_info_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_GET_DESCR_INFO, ca_descr_info_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_GET_DESCR_INFO for this command.

ca_descr_info_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_GET_MSG, ca_msg_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_GET_MSG for this command.

ca_msg_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_SEND_MSG, ca_msg_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_SEND_MSG for this command.

ca_msg_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_SET_DESCR, ca_descr_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_SET_DESCR for this command.

ca_descr_t *

Undocumented.

This ioctl is undocumented. Documentation is welcome.

int ioctl(fd, int request = CA_SET_PID, ca_pid_t *);

int fd

File descriptor returned by a previous call to open().

int request

Equals CA_SET_PID for this command.

ca_pid_t *

Undocumented.