41e9fedf87
bugfixes:
SYSTEM:
. removed
rc->p_priv->s_flags = 0;
for the priv struct shared by all user processes in get_priv(). this
should only be done once. doing a SYS_PRIV_USER in sys_privctl()
caused the flags of all user processes to be reset, so they were no
longer PREEMPTIBLE. this happened when RS executed a policy script.
(this broke test1 in the test set)
VFS/MFS:
. chown can change the mode of a file, and chmod arguments are only
part of the full file mode so the full filemode is slightly magic.
changed these calls so that the final modes are returned to VFS, so
that the vnode can be kept up-to-date.
(this broke test11 in the test set)
MFS:
. lookup() checked for sizeof(string) instead of sizeof(user_path),
truncating long path names
(caught by test 23)
. truncate functions neglected to update ctime
(this broke test16)
VFS:
. corner case of an empty filename lookup caused fields of a request
not to be filled in in the lookup functions, not making it clear
that the lookup had failed, causing messages to garbage processes,
causing strange failures.
(caught by test 30)
. trust v_size in vnode when doing reads or writes on non-special
files, truncating i/o where necessary; this is necessary for pipes,
as MFS can't tell when a pipe has been truncated without it being
told explicitly each time.
when the last reader/writer on a pipe closes, tell FS about
the new size using truncate_vn().
(this broke test 25, among others)
. permission check for chdir() had disappeared; added a
forbidden() call
(caught by test 23)
new code, shouldn't change anything:
. introduced RTS_SET, RTS_UNSET, and RTS_ISSET macro's, and their
LOCK variants. These macros set and clear the p_rts_flags field,
causing a lot of duplicated logic like
old_flags = rp->p_rts_flags; /* save value of the flags */
rp->p_rts_flags &= ~NO_PRIV;
if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp);
to change into the simpler
RTS_LOCK_UNSET(rp, NO_PRIV);
so the macros take care of calling dequeue() and enqueue() (or lock_*()),
as the case may be). This makes the code a bit more readable and a
bit less fragile.
. removed return code from do_clocktick in CLOCK as it currently
never replies
. removed some debug code from VFS
. fixed grant debug message in device.c
preemptive checks, tests, changes:
. added return code checks of receive() to SYSTEM and CLOCK
. O_TRUNC should never arrive at MFS (added sanity check and removed
O_TRUNC code)
. user_path declared with PATH_MAX+1 to let it be null-terminated
. checks in MFS to see if strings passed by VFS are null-terminated
IS:
. static irq name table thrown out
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_NICE
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*
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* The parameters for this kernel call are:
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* m1_i1: PR_ENDPT process number to change priority
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* m1_i2: PR_PRIORITY the new priority
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*/
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#include "../system.h"
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#include <minix/type.h>
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#include <sys/resource.h>
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#if USE_NICE
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/*===========================================================================*
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* do_nice *
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*===========================================================================*/
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PUBLIC int do_nice(message *m_ptr)
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{
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/* Change process priority or stop the process. */
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int proc_nr, pri, new_q ;
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register struct proc *rp;
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/* Extract the message parameters and do sanity checking. */
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if(!isokendpt(m_ptr->PR_ENDPT, &proc_nr)) return EINVAL;
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if (iskerneln(proc_nr)) return(EPERM);
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pri = m_ptr->PR_PRIORITY;
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rp = proc_addr(proc_nr);
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if (pri == PRIO_STOP) {
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/* Take process off the scheduling queues. */
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RTS_LOCK_SET(rp, NO_PRIORITY);
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return(OK);
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}
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else if (pri >= PRIO_MIN && pri <= PRIO_MAX) {
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/* The value passed in is currently between PRIO_MIN and PRIO_MAX.
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* We have to scale this between MIN_USER_Q and MAX_USER_Q to match
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* the kernel's scheduling queues.
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*/
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new_q = MAX_USER_Q + (pri-PRIO_MIN) * (MIN_USER_Q-MAX_USER_Q+1) /
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(PRIO_MAX-PRIO_MIN+1);
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if (new_q < MAX_USER_Q) new_q = MAX_USER_Q; /* shouldn't happen */
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if (new_q > MIN_USER_Q) new_q = MIN_USER_Q; /* shouldn't happen */
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/* Make sure the process is not running while changing its priority.
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* Put the process back in its new queue if it is runnable.
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*/
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RTS_LOCK_SET(rp, NO_PRIORITY);
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rp->p_max_priority = rp->p_priority = new_q;
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RTS_LOCK_UNSET(rp, NO_PRIORITY);
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return(OK);
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}
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return(EINVAL);
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}
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#endif /* USE_NICE */
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