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BrlAPI's protocol(3) | BrlAPI | BrlAPI's protocol(3) |
NAME¶
BrlAPI's protocol - Instructions and constants for BrlAPI 's protocol.Data Structures¶
struct brlapi_header_t
Macros¶
#define BRLAPI_PROTOCOL_VERSION ((uint32_t) 8) /** Communication protocol version */
Functions¶
ssize_t brlapi_writePacket (brlapi_fileDescriptor fd, brlapi_packetType_t type, const void *buf, size_t size)
Variables¶
pthread_mutex_t brlapi_fd_mutex
Detailed Description¶
These are defines for the protocol between BrlAPI 's server and clients. Understanding is not needed to use the BrlAPI library, so reading this is not needed unless really wanting to connect to BrlAPI without BrlAPI 's library.Macro Definition Documentation¶
#define BRLAPI_AUTH_CRED 'C'¶
Explicit socket credentials authorization#define BRLAPI_AUTH_KEY 'K'¶
Key authorization#define BRLAPI_AUTH_NONE 'N'¶
No or implicit authorization#define BRLAPI_DEVICE_MAGIC (0xdeadbeefL)¶
Magic number to give when sending a BRLPACKET_ENTERRAWMODE or BRLPACKET_SUSPEND packet#define BRLAPI_HEADERSIZE sizeof( brlapi_header_t)¶
Size of packet headers#define BRLAPI_MAXPACKETSIZE 512¶
Maximum packet size for packets exchanged on sockets and with braille terminal#define BRLAPI_PACKET_ACCEPTKEYRANGES 'u'¶
Unmask key ranges#define BRLAPI_PACKET_ACK 'A'¶
Acknowledgement#define BRLAPI_PACKET_AUTH 'a'¶
Authorization#define BRLAPI_PACKET_ENTERRAWMODE '*'¶
Enter in raw mode#define BRLAPI_PACKET_ENTERTTYMODE 't'¶
Asks for a specified tty#define BRLAPI_PACKET_ERROR 'e'¶
non-fatal error#define BRLAPI_PACKET_EXCEPTION 'E'¶
Exception#define BRLAPI_PACKET_GETDISPLAYSIZE 's'¶
Dimensions of brl display#define BRLAPI_PACKET_GETDRIVERNAME 'n'¶
Ask which driver is used#define BRLAPI_PACKET_IGNOREKEYRANGES 'm'¶
Mask key ranges#define BRLAPI_PACKET_KEY 'k'¶
Braille key#define BRLAPI_PACKET_LEAVERAWMODE '#'¶
Leave raw mode#define BRLAPI_PACKET_LEAVETTYMODE 'L'¶
Release the tty#define BRLAPI_PACKET_PACKET 'p'¶
Raw packets#define BRLAPI_PACKET_RESUMEDRIVER 'R'¶
Resume driver#define BRLAPI_PACKET_SETFOCUS 'F'¶
Set current tty focus#define BRLAPI_PACKET_SUSPENDDRIVER 'S'¶
Suspend driver#define BRLAPI_PACKET_VERSION 'v'¶
Version#define BRLAPI_PACKET_WRITE 'w'¶
Write#define BRLAPI_PROTOCOL_VERSION ((uint32_t) 8) /** Communication protocol version */¶
#define BRLAPI_WF_ATTR_AND 0X08¶
And attributes#define BRLAPI_WF_ATTR_OR 0X10¶
Or attributes#define BRLAPI_WF_CHARSET 0X40¶
Charset#define BRLAPI_WF_CURSOR 0X20¶
Cursor position#define BRLAPI_WF_DISPLAYNUMBER 0X01¶
Flags for writing Display number#define BRLAPI_WF_REGION 0X02¶
Region parameter#define BRLAPI_WF_TEXT 0X04¶
Contains some textFunction Documentation¶
ssize_t brlapi_readPacket ( brlapi_fileDescriptorfd, brlapi_packetType_t *type, void *buf, size_tsize)¶
Read a packet from BrlAPI server This function is for internal use, but one might use it if one really knows what one is doing... type is where the function will store the packet type; it should always be one of the above defined BRLPACKET_* (or else something very nasty must have happened :/). The syntax is the same as read()'s. Returns:packet's size, -2 if EOF occurred, -1 on error or signal
interruption.
If the packet is larger than the supplied buffer, the buffer will be filled with
the beginning of the packet, the rest of the packet being discarded. This
follows the semantics of the recv system call when the MSG_TRUNC option is
given.
See also:
brlapi_writePacket()
ssize_t brlapi_readPacketContent ( brlapi_fileDescriptorfd, size_tpacketSize, void *buf, size_tbufSize)¶
Read the content of a packet from BrlAPI server This function is for internal use, but one might use it if one really knows what one is doing... packetSize is the size announced by brlapi_readPacketHeader() bufSize is the size of buf Returns:packetSize, -2 if EOF occurred, -1 on error.
If the packet is larger than the supplied buffer, the buffer will be filled with
the beginning of the packet, the rest of the packet being discarded. This
follows the semantics of the recv system call when the MSG_TRUNC option is
given.
See also:
brlapi_writePacket()
brlapi_readPacketHeader() brlapi_readPacket()
ssize_t brlapi_readPacketHeader ( brlapi_fileDescriptorfd, brlapi_packetType_t *packetType)¶
Read the header (type+size) of a packet from BrlAPI server This function is for internal use, but one might use it if one really knows what one is doing... type is where the function will store the packet type; it should always be one of the above defined BRLPACKET_* (or else something very nasty must have happened :/). Returns:packet's size, -2 if EOF occurred, -1 on error or signal
interruption.
See also:
brlapi_writePacket()
brlapi_readPacketContent brlapi_readPacket
ssize_t brlapi_writePacket ( brlapi_fileDescriptorfd, brlapi_packetType_ttype, const void *buf, size_tsize)¶
Send a packet to BrlAPI server This function is for internal use, but one might use it if one really knows what one is doing... type should only be one of the above defined BRLPACKET_*. The syntax is the same as write()'s. Returns:0 on success, -1 on failure.
See also:
brlapi_readPacketHeader()
brlapi_readPacketContent() brlapi_readPacket()
Variable Documentation¶
pthread_mutex_t brlapi_fd_mutex¶
Mutex for protecting concurrent fd access In order to regulate concurrent access to the library's file descriptor and requests to / answers from BrlAPI server, every function of the library locks this mutex, namely- •
- brlapi_openConnection()
- •
- brlapi_closeConnection()
- •
- brlapi_enterRawMode()
- •
- brlapi_leaveRawMode()
- •
- brlapi_sendRaw()
- •
- brlapi_recvRaw()
- •
- brlapi_getDriverId()
- •
- brlapi_getDriverName()
- •
- brlapi_getDisplaySize()
- •
- brlapi_enterTtyMode()
- •
- brlapi_enterTtyModeWithPath()
- •
- brlapi_leaveTtyMode()
- •
- brlapi_*write*()
- •
- brlapi_(un)?ignorekey(Range|Set)()
- •
- brlapi_readKey()
Author¶
Generated automatically by Doxygen for BrlAPI from the source code.Thu Apr 16 2015 | Version 1.0 |