minix/servers/ipc/main.c
Ben Gras 75d3db4911 new ipc server that implements shared memory and semaphores.
this server, tests, vm support, library stubs and other contributions
are the work of Guanqun Lu, a 2009 GSOC student.
2009-09-21 14:53:13 +00:00

102 lines
2 KiB
C

#include "inc.h"
PUBLIC int identifier = 0x1234;
PUBLIC endpoint_t who_e;
PUBLIC int call_type;
PUBLIC endpoint_t SELF_E;
struct {
int type;
int (*func)(message *);
int reply; /* whether the reply action is passed through */
} ipc_calls[] = {
{ IPC_SHMGET, do_shmget, 0 },
{ IPC_SHMAT, do_shmat, 0 },
{ IPC_SHMDT, do_shmdt, 0 },
{ IPC_SHMCTL, do_shmctl, 0 },
{ IPC_SEMGET, do_semget, 0 },
{ IPC_SEMCTL, do_semctl, 0 },
{ IPC_SEMOP, do_semop, 1 },
};
#define SIZE(a) (sizeof(a)/sizeof(a[0]))
int verbose = 0;
PUBLIC int main(int argc, char *argv[])
{
message m;
SELF_E = getprocnr();
if(verbose)
printf("IPC: self: %d\n", SELF_E);
while (TRUE) {
int r;
int i;
if ((r = receive(ANY, &m)) != OK)
printf("IPC receive error %d.\n", r);
who_e = m.m_source;
call_type = m.m_type;
if(verbose)
printf("IPC: get %d from %d\n", call_type, who_e);
if (call_type & NOTIFY_MESSAGE) {
switch (who_e) {
case PM_PROC_NR:
/* PM sends a notify() on shutdown,
* checkout if there are still IPC keys,
* give warning messages.
*/
if (!is_sem_nil() || !is_shm_nil())
printf("IPC: exit with un-clean states.\n");
break;
case VM_PROC_NR:
/* currently, only semaphore needs such information. */
sem_process_vm_notify();
break;
default:
printf("IPC: ignoring notify() from %d\n",
who_e);
break;
}
continue;
}
/* dispatch messages */
for (i = 0; i < SIZE(ipc_calls); i++) {
if (ipc_calls[i].type == call_type) {
int result;
result = ipc_calls[i].func(&m);
if (ipc_calls[i].reply)
break;
m.m_type = result;
if(verbose && result != OK)
printf("IPC: error for %d: %d\n",
call_type, result);
if ((r = sendnb(who_e, &m)) != OK)
printf("IPC send error %d.\n", r);
break;
}
}
if (i == SIZE(ipc_calls)) {
/* warn and then ignore */
printf("IPC unknown call type: %d from %d.\n",
call_type, who_e);
}
update_refcount_and_destroy();
}
/* no way to get here */
return -1;
}