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The external program resides in another OS process.
6 Port Drivers
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.
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 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.
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.