159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
#include "inc.h"
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int identifier = 0x1234;
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endpoint_t who_e;
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int call_type;
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static struct {
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int type;
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int (*func)(message *);
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int reply; /* whether the reply action is passed through */
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} ipc_calls[] = {
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{ IPC_SHMGET, do_shmget, 0 },
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{ IPC_SHMAT, do_shmat, 0 },
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{ IPC_SHMDT, do_shmdt, 0 },
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{ IPC_SHMCTL, do_shmctl, 0 },
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{ IPC_SEMGET, do_semget, 0 },
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{ IPC_SEMCTL, do_semctl, 0 },
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{ IPC_SEMOP, do_semop, 1 },
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};
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#define SIZE(a) (sizeof(a)/sizeof(a[0]))
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static int verbose = 0;
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/* SEF functions and variables. */
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static void sef_local_startup(void);
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static int sef_cb_init_fresh(int type, sef_init_info_t *info);
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static void sef_cb_signal_handler(int signo);
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int main(int argc, char *argv[])
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{
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message m;
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/* SEF local startup. */
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env_setargs(argc, argv);
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sef_local_startup();
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while (TRUE) {
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int r;
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int ipc_number;
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if ((r = sef_receive(ANY, &m)) != OK)
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printf("sef_receive failed %d.\n", r);
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who_e = m.m_source;
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call_type = m.m_type;
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if(verbose)
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printf("IPC: get %d from %d\n", call_type, who_e);
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if (call_type & NOTIFY_MESSAGE) {
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switch (who_e) {
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case VM_PROC_NR:
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/* currently, only semaphore needs such information. */
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sem_process_vm_notify();
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break;
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default:
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printf("IPC: ignoring notify() from %d\n",
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who_e);
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break;
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}
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continue;
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}
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/*
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* The ipc number in the table can be obtained
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* with a simple equation because the values of
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* IPC system calls are consecutive and begin
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* at ( IPC_BASE + 1 )
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*/
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ipc_number = call_type - (IPC_BASE + 1);
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/* dispatch message */
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if (ipc_number >= 0 && ipc_number < SIZE(ipc_calls)) {
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int result;
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if (ipc_calls[ipc_number].type != call_type)
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panic("IPC: call table order mismatch");
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/* If any process does an IPC call,
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* we have to know about it exiting.
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* Tell VM to watch it for us.
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*/
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if(vm_watch_exit(m.m_source) != OK) {
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printf("IPC: watch failed on %d\n", m.m_source);
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}
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result = ipc_calls[ipc_number].func(&m);
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/*
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* The handler of the IPC call did not
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* post a reply.
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*/
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if (!ipc_calls[ipc_number].reply) {
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m.m_type = result;
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if(verbose && result != OK)
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printf("IPC: error for %d: %d\n",
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call_type, result);
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if ((r = ipc_sendnb(who_e, &m)) != OK)
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printf("IPC send error %d.\n", r);
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}
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} else {
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/* warn and then ignore */
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printf("IPC unknown call type: %d from %d.\n",
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call_type, who_e);
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}
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update_refcount_and_destroy();
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}
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/* no way to get here */
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return -1;
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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static void sef_local_startup()
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{
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/* Register init callbacks. */
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sef_setcb_init_fresh(sef_cb_init_fresh);
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sef_setcb_init_restart(sef_cb_init_fresh);
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/* Register signal callbacks. */
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sef_setcb_signal_handler(sef_cb_signal_handler);
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*===========================================================================*
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* sef_cb_init_fresh *
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*===========================================================================*/
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static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
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{
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/* Initialize the ipc server. */
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if(verbose)
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printf("IPC: self: %d\n", sef_self());
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return(OK);
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}
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/*===========================================================================*
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* sef_cb_signal_handler *
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*===========================================================================*/
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static void sef_cb_signal_handler(int signo)
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{
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/* Only check for termination signal, ignore anything else. */
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if (signo != SIGTERM) return;
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/* Checkout if there are still IPC keys. Inform the user in that case. */
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if (!is_sem_nil() || !is_shm_nil())
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printf("IPC: exit with un-clean states.\n");
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}
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