文章摘要
This article describes a function that manages a port (Port) and processes data through it. The function includes defining the port with parameters like spawn, command, stream, in, eof, and exit status, followed by retrieving data using the `get_data` function. The `get_data` function handles receiving data from the port, appending it to a buffer, and managing end-of-file conditions. It also includes mechanisms for exiting the program, such as receiving exit commands and handling exit status codes. The article concludes with the final exit code and the processed data.
my_exec(Command) ->
Port=open_port({spawn, Command}, [stream, in, eof, hide, exit_status]),
Result=get_data(Port, []),
Result.
get_data(Port, Sofar) ->
receive
{Port, {data, Bytes}} ->
get_data(Port, [Sofar|Bytes]);
{Port, eof} ->
Port ! {self(), close},
receive
{Port, closed} ->
true
end,
receive
{‘EXIT’, Port, _} ->
ok
after 1 -> % force context switch
ok
end,
ExitCode=
receive
{Port, {exit_status, Code}} ->
Code
end,
{ExitCode, lists:flatten(Sofar)}
end.
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