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* Introduced a flag to decide whether it's still okay to call a certain

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syscall.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34238 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2009-11-25 11:50:45 +00:00
parent 23f179da55
commit 40fddd06d6
1 changed files with 14 additions and 8 deletions
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22
src/system/kernel/syscalls.cpp
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@ -62,6 +62,7 @@ struct generic_syscall {
uint32 version;
uint32 flags;
int32 use_count;
bool valid;
generic_syscall *previous;
};
@ -140,17 +141,19 @@ _user_generic_syscall(const char* userSubsystem, uint32 function,
while (syscall != NULL) {
generic_syscall* next;
syscall->use_count++;
locker.Unlock();
if (syscall->valid) {
syscall->use_count++;
locker.Unlock();
status_t status
= syscall->hook(subsystem, function, buffer, bufferSize);
status_t status
= syscall->hook(subsystem, function, buffer, bufferSize);
locker.Lock();
syscall->use_count--;
locker.Lock();
syscall->use_count--;
if (status != B_BAD_HANDLER)
return status;
if (status != B_BAD_HANDLER)
return status;
}
// the syscall may have been removed in the mean time
next = find_generic_syscall(subsystem);
@ -264,6 +267,7 @@ register_generic_syscall(const char* subsystem, syscall_hook hook,
syscall->version = version;
syscall->flags = flags;
syscall->use_count = 0;
syscall->valid = true;
syscall->previous = previous;
list_add_item(&sGenericSyscalls, syscall);
@ -286,6 +290,8 @@ unregister_generic_syscall(const char* subsystem, uint32 version)
if (syscall == NULL)
return B_NAME_NOT_FOUND;
syscall->valid = false;
if (syscall->use_count != 0) {
// TODO: we could use a condition variable here instead
locker.Unlock();