On Fri, 01 Mar 2019 23:29:53 -0500, Jeffrey Walton said: > I cannot seem to open the device in exclusive mode. The current open > is (I also tried with O_EXCL): > > int modem = open(device_path, O_RDWR | O_NOCTTY | O_SYNC); So what happens? Does the open fail? If so, what does perror() say about it? Or does the open work but the flag is ignored? Have you tried making the *other* program open it with O_EXCL so your caller-id program can't mess with its state? _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
