b423d7b477
o Support for ptrace T_ATTACH/T_DETACH and T_SYSCALL o PM signal handling logic should now work properly, even with debuggers being present o Asynchronous PM/VFS protocol, full IPC support for senda(), and AMF_NOREPLY senda() flag DETAILS Process stop and delay call handling of PM: o Added sys_runctl() kernel call with sys_stop() and sys_resume() aliases, for PM to stop and resume a process o Added exception for sending/syscall-traced processes to sys_runctl(), and matching SIGKREADY pseudo-signal to PM o Fixed PM signal logic to deal with requests from a process after stopping it (so-called "delay calls"), using the SIGKREADY facility o Fixed various PM panics due to race conditions with delay calls versus VFS calls o Removed special PRIO_STOP priority value o Added SYS_LOCK RTS kernel flag, to stop an individual process from running while modifying its process structure Signal and debugger handling in PM: o Fixed debugger signals being dropped if a second signal arrives when the debugger has not retrieved the first one o Fixed debugger signals being sent to the debugger more than once o Fixed debugger signals unpausing process in VFS; removed PM_UNPAUSE_TR protocol message o Detached debugger signals from general signal logic and from being blocked on VFS calls, meaning that even VFS can now be traced o Fixed debugger being unable to receive more than one pending signal in one process stop o Fixed signal delivery being delayed needlessly when multiple signals are pending o Fixed wait test for tracer, which was returning for children that were not waited for o Removed second parallel pending call from PM to VFS for any process o Fixed process becoming runnable between exec() and debugger trap o Added support for notifying the debugger before the parent when a debugged child exits o Fixed debugger death causing child to remain stopped forever o Fixed consistently incorrect use of _NSIG Extensions to ptrace(): o Added T_ATTACH and T_DETACH ptrace request, to attach and detach a debugger to and from a process o Added T_SYSCALL ptrace request, to trace system calls o Added T_SETOPT ptrace request, to set trace options o Added TO_TRACEFORK trace option, to attach automatically to children of a traced process o Added TO_ALTEXEC trace option, to send SIGSTOP instead of SIGTRAP upon a successful exec() of the tracee o Extended T_GETUSER ptrace support to allow retrieving a process's priv structure o Removed T_STOP ptrace request again, as it does not help implementing debuggers properly o Added MINIX3-specific ptrace test (test42) o Added proper manual page for ptrace(2) Asynchronous PM/VFS interface: o Fixed asynchronous messages not being checked when receive() is called with an endpoint other than ANY o Added AMF_NOREPLY senda() flag, preventing such messages from satisfying the receive part of a sendrec() o Added asynsend3() that takes optional flags; asynsend() is now a #define passing in 0 as third parameter o Made PM/VFS protocol asynchronous; reintroduced tell_fs() o Made PM_BASE request/reply number range unique o Hacked in a horrible temporary workaround into RS to deal with newly revealed RS-PM-VFS race condition triangle until VFS is asynchronous System signal handling: o Fixed shutdown logic of device drivers; removed old SIGKSTOP signal o Removed is-superuser check from PM's do_procstat() (aka getsigset()) o Added sigset macros to allow system processes to deal with the full signal set, rather than just the POSIX subset Miscellaneous PM fixes: o Split do_getset into do_get and do_set, merging common code and making structure clearer o Fixed setpriority() being able to put to sleep processes using an invalid parameter, or revive zombie processes o Made find_proc() global; removed obsolete proc_from_pid() o Cleanup here and there Also included: o Fixed false-positive boot order kernel warning o Removed last traces of old NOTIFY_FROM code THINGS OF POSSIBLE INTEREST o It should now be possible to run PM at any priority, even lower than user processes o No assumptions are made about communication speed between PM and VFS, although communication must be FIFO o A debugger will now receive incoming debuggee signals at kill time only; the process may not yet be fully stopped o A first step has been made towards making the SYSTEM task preemptible
53 lines
1.6 KiB
C
53 lines
1.6 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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/* 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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if (pri < PRIO_MIN || pri > PRIO_MAX) return(EINVAL);
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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, SYS_LOCK);
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rp->p_max_priority = rp->p_priority = new_q;
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RTS_LOCK_UNSET(rp, SYS_LOCK);
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return(OK);
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}
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#endif /* USE_NICE */
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