413 lines
8.2 KiB
Markdown
413 lines
8.2 KiB
Markdown
## BSD Socket Extension API
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Most functions will return -2 if the bsdsocket.library is
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not open.
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---
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## Setup
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#### ADDR=Socket Library Open
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Try to open bsdsocket.library version 4.
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##### Returns
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* 0 if opening failed
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* Memory address of library on success
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* If needed, you'll be able to directly access library functions
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using this address.
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---
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#### Socket Library Close
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Close bsdsocket.library. This is safe to call if the library
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is not open
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---
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#### RESULT=Socket Set Nonblocking(Socket, IsNonblocking BOOL)
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Make a socket blocking (False, default), or nonblocking (True).
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##### Returns
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* Result of IoctlSocket call.
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---
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#### RESULT=Socket Reuse Addr(Socket)
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Make a listening socket reuse the address it's trying to bind to.
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You probably want to call this right before Socket Listen.
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##### Returns
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* Result of setsockopt call.
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---
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## Connections
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#### SOCKET=Socket Create Inet Socket
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Create a new Internet socket for reading or writing.
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##### Returns
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* Socket number on success
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* -1 on failure
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---
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#### RESULT=Socket Connect(Socket to IPAddress$, Port)
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Attempt to connect to a remote IP address.
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##### Emulation vs. Physical/FPGA Amiga note
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On emulated Amigas (FS-UAE) with emulated `bsdsocket.library`, a failure in
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`Socket Connect` due to giving the function a bad IP address allows you to reuse
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the socket. On real or FPGA-based Amiga running real TCP/IP stacks (MiamiDX,
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Roadshow), the socket will be made unusable and you'll need to
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`Socket Close Socket` and reopen the socket with whatever parameters necessary.
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Closing and opening `bsdsocket.library` has the same effect.
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Always close and re-open a socket if you have any `Socket Connect` failure and
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any non-blocking polling loops time out!
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##### Returns
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* 0 on connected
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* -1 on error
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* If your socket is non-blocking, you have to check
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the socket with Socket Select and Socket Getsockopt Int
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to see if the connection succeeded
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* -11 port out of range
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* -13 IP address has zero length
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---
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#### RESULT=Socket Reuse Addr(Socket)
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Set a server socket to reuse an interface and port that had
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been used recently. You likely want this if you're building
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something that listens on a port for connections. This calls
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`setsockopt()` for you.
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##### Returns
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The result of calling setsockopt() while setting your socket
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to reuse addresses.
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---
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#### RESULT=Socket Bind(Socket to IPAddress, Port)
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Attempt to bind a socket to a network interface. Use
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the string "IPADDR_ANY" for IPAddress to bind to all
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interfaces.
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##### Returns
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* 0 on success
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* -1 on other error
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* -11 port out of range
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---
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#### RESULT=Socket Listen(Socket)
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Start listening for connections.
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##### Returns
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* 0 on success
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* -1 on failure
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---
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#### NEW_SOCKET=Socket Accept(Socket)
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Get the socket that connected to this one. Wait for a connect
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if this socket is blocking.
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##### Warning
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If this socket is blocking (the default), you will likely
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get AMOS stuck in a state you can't recover from, due to
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how AMOS takes over system signals! Be sure to make your
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socket non-blocking and use Fdsets and Select!
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##### Returns
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* The remote socket number on success
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* -1 on failure
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---
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#### RESULT=Socket Wait Async Reading(Socket, Wait_ms)
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Wait the given number of milliseconds for the nonblocking socket to be ready for reading.
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Use on a listen socket to await new connections, or on a connected socket to await
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incoming data packets.
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##### Returns
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* 0 on timeout.
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* -1 on error. Use `Socket Errno` for more detail.
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* 1 on success.
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---
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#### RESULT=Socket Wait Async Writing(Socket, Wait_ms)
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Wait the given number of milliseconds for the nonblocking socket to be ready for writing.
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Use this when you're connecting to a remote server and want to know if the connection
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has been completed.
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##### Returns
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* 0 on timeout.
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* -1 on error. Use `Socket Errno` for more detail.
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* -3 on the socket having an error.
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* If you're using this function to test for a successful connection and
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receive a -3, close and reopen the socket, otherwise subsequent
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checks will return 1.
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* 1 on success.
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---
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#### RESULT=Socket Set Timeout(Socket, Wait_ms)
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Set a socket to timeout after Wait_ms milliseconds if reading or writing doesn't complete.
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##### Returns
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* 0 on success
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* -1 on error
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---
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#### RESULT=Socket Close Socket(Socket)
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Close a socket.
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##### Returns
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* 0 on success
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* -1 on error
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---
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## Data Transfers
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#### SENT=Socket Send$(Socket, String$)
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Send a string to a connected socket.
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##### Bugs
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For some reason, this command performs incorrectly when
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used in a Procedure to send a passed-in variable,
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and Varptr() is not called on the string variable to be sent
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beforehand within the procedure itself. I believe this is
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a bug in AMOS itself. You'll know you're having this issue if
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the byte count returned is abnormally high.
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If you're using this in a Procedure, call Varptr() first:
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```
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Procedure SEND_STRING[SOCKET, S$]
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' _shrug_
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_=Varptr(S$)
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BYTES=Socket Send$(SOCKET,S$)
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End Proc
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```
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##### Returns
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* Number of characters sent
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* -1 on other error
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---
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#### SENT=Socket Send(Socket, Data Pointer, Length)
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Send a block of data to a connected socket.
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##### Returns
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* Number of characters sent
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* -1 on other error
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---
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#### DATA$=Socket Recv$(Socket, MaxLength)
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Retrieve at most MaxLength bytes from Socket, and put them into a string.
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If Len(DATA$) < MaxLength, you've read the last bit of data from the socket.
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##### Returns
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* String of data, which is blank if there is no more data.
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---
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#### LENGTH=Socket Recv(Socket to Dataptr, MaxLength)
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Retrieve at most MaxLength bytes from Socket, and put them into the memory
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address at Dataptr.
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#### Returns
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* Count of bytes read
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* -1 on error
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---
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## Informational
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#### HOST=Socket Get Host(Socket)
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Get the IPv4 (Long) host value the given socket is using.
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##### Returns
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* Host as a long value
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---
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#### PORT=Socket Get Port(Socket)
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Get the 16-bit port (Word) value the given socket is using.
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##### Returns
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* Port as a word value
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---
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#### RESULT$=Socket Inet Ntoa$(Host)
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Turn a long Host address into a string.
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##### Returns
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* IP address as string
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---
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#### RESULT=Socket Errno
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Get the error from the last command. Note that this is
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not cleared on a successful command!
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##### Returns
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Error number from last call. Look in <sys/error.h> for more
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details.
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---
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#### RESULT=Socket Herrno
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Get the error from the last DNS resolver command.
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##### Returns
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Resolver error number (`h_errno`) from last call.
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---
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#### RESULT$=Dns Get Address By Name$(Domain Name$)
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Look up the first IP address associated with this hostname.
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##### Warning
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This is dependent on your stack's name resolution. If DNS lookups
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aren't working correctly, you may have to wait for the lookup to time
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out. There's no way to set this timeout, or cancel or override it via AMOS.
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##### Returns
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String with IP address, or blank string on error.
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---
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## Low Level
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#### RESULT=Socket Setsockopt Int(Socket, Option, Value)
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Set a socket option. You probably want SO_REUSEADDR,
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which is Option=$4, and you want Value=True. Or, use
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Socket Reuse Addr().
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##### Returns
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* Result of setsockopt call
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---
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#### RESULT=Socket Getsockopt Int(Socket, Option)
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Get a socket option. You probably want SO_ERROR,
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which is Option=$1007, and it's what you check when you
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attempt a connection with a non-blocking socket.
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##### Returns
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* Result of getsockopt call
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---
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#### ADDR=Socket Fdset Zero(fd_set)
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Clear out the specified fd_set.
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##### Returns
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* Address to that particular fd_set
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* -1 if fd_set out of range. You get 16 of them.
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---
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#### ADDR=Socket Fdset Set(fd_set, Socket to Value BOOL)
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Set or clear a socket bit in an fd_set.
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##### Returns
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* Address to that particular fd_set
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* -1 if fd_set is out of range or socket is out of range.
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---
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#### RESULT=Socket Fdset Is Set(fd_set, Socket)
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See if the particular socket remained after a Socket Select call.
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##### Returns
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* True or False if the socket is set or not
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---
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#### RESULT=Socket Select(Max Socket, Read fd_set, Write fd_set, Error fd_set, TimeoutMS)
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Wait for the specified number of milliseconds. If any of the sockets
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in any of the fd_sets become interesting during that time, stop
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waiting, clear out the uninteresting sockets in the fd_sets, and return
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how many sockets were left.
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##### Returns
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* 0 on timeout
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* -1 on error
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* # of interesting sockets on success
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