Hello hackers... We got for example a kld module and we have catched some syscall. Now we want to change effective uid of process, but not curproc. How to lock this process?
struct proc *proc;
uid_t olduid;
[...]
if ((proc = pfind(123)) == NULL)
return (ESRCH);
olduid = pc->pc_ucred->cr_uid;
change_euid(proc, 0);
/* now some simple action */
change_euid(proc, olduid);
How to be sure that process 'proc' arn't running on other CPU?
Function lockmgr() is used for problems like this one?
Where I could find some more information about it?
For now I've wrote only comments in /sys/sys/lock.h, etc.
There are any papers about programming in SMP?
--
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.
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