Messages in this thread | | | From | "Bhattacharjee, Satadal" <> | Subject | Registering for multiple SIGIO within a process | Date | Wed, 28 Sep 2005 16:02:53 -0600 |
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Hi, I have hit a typical situation where I am having issues with signals. Below is the description of the issue. There are two separate Host Bus Adapters (HBA) connected to the system. Each HBA has its own driver loaded in the kernel.
There are two separate shared objects to talk to each of the drivers. One shared object does not communicate with the other one.
Each shared object has function within it to register with kernel to receive SIGIO when an event is generated by the HBA. Driver received the event from the HBA and sends SIGIO to the kernel.
There is an application (executable) which loads the two shared objects. Application then calls function within the shared object to register events from HBA.
When driver generates a signal, the shared object which registered last, receives the signal. The first registration never receives any signal.
Now I checked the man pages and found out that you can register for the same signal only once from a process. We tried to change the signal from SIGIO to SIGUSER1 in one of the shared object. But on checking the kernel code we realized that only SIGIO is supported.
So can somebody suggest what is the correct mechanism to register with the kernel for receiving multiple signals from a single process?
I am not subscribed to the list, so please copy me in the CC field when replying. The shared object code snippet for registration is below: struct sigaction sa; int oflags; int rc = 0; // setup the signal handler memset(&sa, 0, sizeof(struct sigaction)); sa.sa_handler = &AENSignalHandler; // AENSignalHandler is the signal handler
//sa.sa_flags = SA_ONESHOT; sigfillset(&sa.sa_mask); sigaction(SIGIO, &sa, NULL); //aen_do_registration - enable driver to send us SIGIO for event notification rc = fcntl(ghMegaDev, F_SETOWN, getpid()); // ghMegaDev is the handle to the driver if (rc < 0) { perror("AEN: registration, F_SETOWN"); return SL_ERR_LINUX_AEN_INIT_FAILED; } oflags = fcntl(ghMegaDev, F_GETFL); rc = fcntl(ghMegaDev, F_SETFL, oflags| FASYNC); if (rc < 0) { perror("setup_aen_handler: Failed to set ASYNC flag\n"); return SL_ERR_LINUX_AEN_INIT_FAILED; } ***************************************************************** Satadal Bhattacharjee, LSI Logic Corp., 3098 W Warren Ave, Fremont, CA, 94539 satadalb@lsil.com (408) 433-4204
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