minix/servers/is/main.c
Ben Gras 7967177710 endpoint-aware conversion of servers.
'who', indicating caller number in pm and fs and some other servers, has
been removed in favour of 'who_e' (endpoint) and 'who_p' (proc nr.).

In both PM and FS, isokendpt() convert endpoints to process slot
numbers, returning OK if it was a valid and consistent endpoint number.
okendpt() does the same but panic()s if it doesn't succeed. (In PM,
this is pm_isok..)

pm and fs keep their own records of process endpoints in their proc tables,
which are needed to make kernel calls about those processes.

message field names have changed.

fs drivers are endpoints.

fs now doesn't try to get out of driver deadlock, as the protocol isn't
supposed to let that happen any more. (A warning is printed if ELOCKED
is detected though.)

fproc[].fp_task (indicating which driver the process is suspended on)
became an int.

PM and FS now get endpoint numbers of initial boot processes from the
kernel. These happen to be the same as the old proc numbers, to let
user processes reach them with the old numbers, but FS and PM don't know
that. All new processes after INIT, even after the generation number
wraps around, get endpoint numbers with generation 1 and higher, so
the first instances of the boot processes are the only processes ever
to have endpoint numbers in the old proc number range.

More return code checks of sys_* functions have been added.

IS has become endpoint-aware. Ditched the 'text' and 'data' fields
in the kernel dump (which show locations, not sizes, so aren't terribly
useful) in favour of the endpoint number. Proc number is still visible.

Some other dumps (e.g. dmap, rs) show endpoint numbers now too which got
the formatting changed.

PM reading segments using rw_seg() has changed - it uses other fields
in the message now instead of encoding the segment and process number and
fd in the fd field. For that it uses _read_pm() and _write_pm() which to
_taskcall()s directly in pm/misc.c.

PM now sys_exit()s itself on panic(), instead of sys_abort().

RS also talks in endpoints instead of process numbers.
2006-03-03 10:20:58 +00:00

156 lines
5.3 KiB
C

/* System Information Service.
* This service handles the various debugging dumps, such as the process
* table, so that these no longer directly touch kernel memory. Instead, the
* system task is asked to copy some table in local memory.
*
* Created:
* Apr 29, 2004 by Jorrit N. Herder
*/
#include "inc.h"
/* Set debugging level to 0, 1, or 2 to see no, some, all debug output. */
#define DEBUG_LEVEL 1
#define DPRINTF if (DEBUG_LEVEL > 0) printf
/* Allocate space for the global variables. */
message m_in; /* the input message itself */
message m_out; /* the output message used for reply */
int who_e; /* caller's proc number */
int callnr; /* system call number */
int sys_panic; /* flag to indicate system-wide panic */
extern int errno; /* error number set by system library */
/* Declare some local functions. */
FORWARD _PROTOTYPE(void init_server, (int argc, char **argv) );
FORWARD _PROTOTYPE(void exit_server, (void) );
FORWARD _PROTOTYPE(void get_work, (void) );
FORWARD _PROTOTYPE(void reply, (int whom, int result) );
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(int argc, char **argv)
{
/* This is the main routine of this service. The main loop consists of
* three major activities: getting new work, processing the work, and
* sending the reply. The loop never terminates, unless a panic occurs.
*/
int result;
sigset_t sigset;
/* Initialize the server, then go to work. */
init_server(argc, argv);
/* Main loop - get work and do it, forever. */
while (TRUE) {
/* Wait for incoming message, sets 'callnr' and 'who'. */
get_work();
switch (callnr) {
case SYS_SIG:
sigset = (sigset_t) m_in.NOTIFY_ARG;
if (sigismember(&sigset,SIGTERM) || sigismember(&sigset,SIGKSTOP)) {
exit_server();
}
continue;
case PANIC_DUMPS:
printf("Oops ... panic in %d. ", who_e);
printf("Hit F-keys for debug dumps or F12 to shut down.\n");
sys_panic = TRUE; /* set flag to allow exit */
continue;
case FKEY_PRESSED:
result = do_fkey_pressed(&m_in);
break;
case DEV_PING:
notify(m_in.m_source);
continue;
default:
report("IS","warning, got illegal request from:", m_in.m_source);
result = EINVAL;
}
/* Finally send reply message, unless disabled. */
if (result != EDONTREPLY) {
reply(who_e, result);
}
}
return(OK); /* shouldn't come here */
}
/*===========================================================================*
* init_server *
*===========================================================================*/
PRIVATE void init_server(int argc, char **argv)
{
/* Initialize the information service. */
int fkeys, sfkeys;
int i, s;
struct sigaction sigact;
/* Install signal handler. Ask PM to transform signal into message. */
sigact.sa_handler = SIG_MESS;
sigact.sa_mask = ~0; /* block all other signals */
sigact.sa_flags = 0; /* default behaviour */
if (sigaction(SIGTERM, &sigact, NULL) < 0)
report("IS","warning, sigaction() failed", errno);
/* Set key mappings. IS takes all of F1-F12 and Shift+F1-F6. */
fkeys = sfkeys = 0;
for (i=1; i<=12; i++) bit_set(fkeys, i);
for (i=1; i<= 8; i++) bit_set(sfkeys, i);
if ((s=fkey_map(&fkeys, &sfkeys)) != OK)
report("IS", "warning, fkey_map failed:", s);
}
/*===========================================================================*
* exit_server *
*===========================================================================*/
PRIVATE void exit_server()
{
/* Shut down the information service. */
int fkeys, sfkeys;
int i,s;
/* Release the function key mappings requested in init_server().
* IS took all of F1-F12 and Shift+F1-F6.
*/
fkeys = sfkeys = 0;
for (i=1; i<=12; i++) bit_set(fkeys, i);
for (i=1; i<= 7; i++) bit_set(sfkeys, i);
if ((s=fkey_unmap(&fkeys, &sfkeys)) != OK)
report("IS", "warning, unfkey_map failed:", s);
/* Done. Now exit. */
exit(0);
}
/*===========================================================================*
* get_work *
*===========================================================================*/
PRIVATE void get_work()
{
int status = 0;
status = receive(ANY, &m_in); /* this blocks until message arrives */
if (OK != status)
panic("IS","failed to receive message!", status);
who_e = m_in.m_source; /* message arrived! set sender */
callnr = m_in.m_type; /* set function call number */
}
/*===========================================================================*
* reply *
*===========================================================================*/
PRIVATE void reply(who, result)
int who; /* destination */
int result; /* report result to replyee */
{
int send_status;
m_out.m_type = result; /* build reply message */
send_status = send(who, &m_out); /* send the message */
if (OK != send_status)
panic("IS", "unable to send reply!", send_status);
}