ERLANG LINKED IN PORT DRIVER

It’s fast, full-featured and elegant. Message passing has however always been documented as an asynchronous operation. The old port owner Pid stays linked to the port and must call unlink Port if this is not desired. The Erlang process which creates a port is said to be the port owner , or the connected process of the port. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Erlang truly is a useful language. Messages Sent To a Port.

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The external program resides in another OS process.

6 Port Drivers

Valid values for N are 1, 2, or 4. The BIFs mentioned are as usual documented in erlang 3. Stack Overflow works best with JavaScript enabled. Like all high-level languages, however, you sometimes need to access legacy or system code written in another language like, you guessed it, C.

Young risk taker.: Tutorial for how to create Erlang linked-in driver.

The solution I chose was to bridge erlang with libcurl by way of an erlang “linked-in driver”. Note that the old port owner is still linked to the port, but the new port owner is not.

Erlang truly is a useful language.

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But it is also the least safe way, because a crash in the port driver brings the emulator down too. They provide a byte-oriented interface to an external program.

go – Converting Erlang-C port example to Erlang-Golang – Stack Overflow

The linked-in driver looks like a port from the Erlang programmer’s point of view and is called a port driver. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Justin can you post working code as answer and mark it as answer. C I’ll start out with some C code that will function as the bridge between erlang jn libcurl. The old port owner Pid stays linked to the port and have to call unlink Port if this is not desired.

Please mark this question answered. The external program should terminate when the port is closed. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

The C driver is a module that is compiled and linked pirt a shared library. That may help others in future. The external program runs outside the Erlang workspace, unless a port driver with the name Command is found. The external program runs outside the Erlang workspace unless a port driver with the name Command is found. All communication to and from the port should go via the port owner.

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Note that the old port owner is still linked to the port, but the new port owner is not. Posting this answer based on Justin’s follow-up question hereerlwng contains a slightly different but working answer.

15 Ports and Port Drivers

PortSettings is a list of settings options for the port. The port owner Pid can communicate with the port Port by sending and receiving messages.

This section outlines an example of how to solve the example problem in Problem Example by using a linked-in linkec driver. Depending on your point of view the hard part is now done. The port driver can also send data to Erlang.

Now I’ll slap a little thread safe erlang wrapper together. However when I try to call the driver from the Erlang side Erlang code below I get the following:. An erroneous port driver will cause the erlag Erlang runtime system to leak memory, hang or crash.

Wed Sep 16 Messages can be sent to and received from a port identifier, just like a pid. They provide a byte-oriented interface to an external program.