_notifyviasignal.c [plain text]
#include "configd.h"
#include "configd_server.h"
#include "session.h"
int
__SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
{
SCDynamicStorePrivateRef storePrivate = (SCDynamicStorePrivateRef)store;
CFStringRef sessionKey;
CFDictionaryRef info;
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreNotifySignal:"));
if (!store || (storePrivate->server == MACH_PORT_NULL)) {
return kSCStatusNoStoreSession;
}
if (storePrivate->notifyStatus != NotifierNotRegistered) {
return kSCStatusNotifierActive;
}
if (pid == getpid()) {
return kSCStatusInvalidArgument;
}
if ((sig <= 0) || (sig > NSIG)) {
return kSCStatusInvalidArgument;
}
sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
info = CFDictionaryGetValue(sessionData, sessionKey);
CFRelease(sessionKey);
if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
CFNumberRef sessionNum;
if (needsNotification == NULL)
needsNotification = CFSetCreateMutable(NULL,
0,
&kCFTypeSetCallBacks);
sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
CFSetAddValue(needsNotification, sessionNum);
CFRelease(sessionNum);
}
return kSCStatusOK;
}
kern_return_t
_notifyviasignal(mach_port_t server,
task_t task,
int sig,
int *sc_status)
{
serverSessionRef mySession = getSession(server);
pid_t pid;
kern_return_t status;
SCDynamicStorePrivateRef storePrivate = (SCDynamicStorePrivateRef)mySession->store;
#ifdef NOTYET
mach_port_t oldNotify;
#endif
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Send signal when a notification key changes."));
SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" server = %d"), server);
SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" task = %d"), task);
SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" signal = %d"), sig);
status = pid_for_task(task, &pid);
if (status != KERN_SUCCESS) {
*sc_status = kSCStatusFailed;
return KERN_SUCCESS;
}
*sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
if (*sc_status != kSCStatusOK) {
if (task != TASK_NULL) {
(void) mach_port_destroy(mach_task_self(), task);
}
return KERN_SUCCESS;
}
#ifdef DEBUG
{ mach_port_type_t pt;
status = mach_port_type(mach_task_self(), task, &pt);
if (status == MACH_MSG_SUCCESS) {
char rights[8], *rp = &rights[0];
if (pt & MACH_PORT_TYPE_SEND)
*rp++ = 'S';
if (pt & MACH_PORT_TYPE_RECEIVE)
*rp++ = 'R';
if (pt & MACH_PORT_TYPE_SEND_ONCE)
*rp++ = 'O';
if (pt & MACH_PORT_TYPE_PORT_SET)
*rp++ = 'P';
if (pt & MACH_PORT_TYPE_DEAD_NAME)
*rp++ = 'D';
*rp = '\0';
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Task %d, port rights = %s"), task, rights);
}
}
#endif
#ifdef NOTYET
status = mach_port_request_notification(mach_task_self(),
task,
MACH_NOTIFY_DEAD_NAME,
1,
task,
MACH_MSG_TYPE_MAKE_SEND_ONCE,
&oldNotify);
if (status != KERN_SUCCESS) {
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
*sc_status = kSCStatusFailed;
return KERN_SUCCESS;
}
if (oldNotify != MACH_PORT_NULL) {
SCLog(_configd_verbose, LOG_ERR, CFSTR("_notifyviasignal(): why is oldNotify != MACH_PORT_NULL?"));
}
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Adding task notification port %d to the server's port set"), task);
status = mach_port_move_member(mach_task_self(), task, server_ports);
if (status != KERN_SUCCESS) {
SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_move_member(): %s"), mach_error_string(status));
*sc_status = kSCStatusFailed;
return KERN_SUCCESS;
}
#endif
storePrivate->notifyStatus = Using_NotifierInformViaSignal;
storePrivate->notifySignal = sig;
storePrivate->notifySignalTask = task;
return KERN_SUCCESS;
}