[fpc-pascal] Data exchange between programs
dleducq at magellan-ing.fr
Wed Sep 6 09:29:08 CEST 2006
Matt Emson a écrit :
>> I have 2 FPC programs running on a Linux machine, is there an easy
>> way to exchange a few data between these programs (I do not want to
>> use disk operations). I was thinking of using environment variables,
>> but I cannot find a way to change environment variables from a
> MMap? Unix domain sockets? Or do these count as file operations?
IPC SysV message queues or shared memory (depends on what portability
you need; needs libc linking).
Things are simpler if the processes that need to communicate descend
from a common ancestor which can setup the communication, allowing
unnamed pipes, or private IPC SysV resources.
> Isn't there a GetEnv and SetEnv procedure/function somewhere in the
> LINUX RTL? Libc or somewhere like that?
If you set an environment variable in a process, only the descendent
processes will inherit and see it, and only the value it has when the
fork occured, so that's usually not an option.
> fpc-pascal maillist - fpc-pascal at lists.freepascal.org
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