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
141 lines
2.6 KiB
C
141 lines
2.6 KiB
C
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#define _MINIX 1
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#define _SYSTEM 1
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#include <minix/config.h>
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#include <ansi.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <minix/syslib.h>
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#include <minix/sysutil.h>
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#include <limits.h>
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#include <errno.h>
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#define ASYN_NR 100
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PRIVATE asynmsg_t msgtable[ASYN_NR];
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PRIVATE int first_slot= 0, next_slot= 0;
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PUBLIC int asynsend3(dst, mp, fl)
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endpoint_t dst;
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message *mp;
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int fl;
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{
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int r, src_ind, dst_ind;
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unsigned flags;
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static int first = 1;
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static int inside = 0;
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int len;
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/* printf() causes asynsend? */
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if(inside) {
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exit(1);
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}
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inside = 1;
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if(first) {
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int i;
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for(i = 0; i < ASYN_NR; i++) {
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msgtable[i].flags = AMF_EMPTY;
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}
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first = 0;
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}
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/* Update first_slot */
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for (; first_slot < next_slot; first_slot++)
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{
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flags= msgtable[first_slot].flags;
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if ((flags & (AMF_VALID|AMF_DONE)) == (AMF_VALID|AMF_DONE))
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{
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if (msgtable[first_slot].result != OK)
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{
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#if 0
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printf(
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"asynsend: found completed entry %d with error %d\n",
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first_slot,
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msgtable[first_slot].result);
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#endif
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}
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continue;
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}
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if (flags != AMF_EMPTY)
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break;
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}
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if (first_slot >= next_slot)
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{
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/* Reset first_slot and next_slot */
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next_slot= first_slot= 0;
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}
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if (next_slot >= ASYN_NR)
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{
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/* Tell the kernel to stop processing */
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r= senda(NULL, 0);
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if (r != OK)
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panic(__FILE__, "asynsend: senda failed", r);
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dst_ind= 0;
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for (src_ind= first_slot; src_ind<next_slot; src_ind++)
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{
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flags= msgtable[src_ind].flags;
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if ((flags & (AMF_VALID|AMF_DONE)) ==
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(AMF_VALID|AMF_DONE))
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{
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if (msgtable[src_ind].result != OK)
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{
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#if 0
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printf(
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"asynsend: found completed entry %d with error %d\n",
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src_ind,
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msgtable[src_ind].result);
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#endif
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}
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continue;
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}
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if (flags == AMF_EMPTY)
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continue;
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#if 0
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printf("asynsend: copying entry %d to %d\n",
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src_ind, dst_ind);
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#endif
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if (src_ind != dst_ind)
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msgtable[dst_ind]= msgtable[src_ind];
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dst_ind++;
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}
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first_slot= 0;
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next_slot= dst_ind;
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if (next_slot >= ASYN_NR)
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panic(__FILE__, "asynsend: msgtable full", NO_NUM);
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}
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fl |= AMF_VALID;
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msgtable[next_slot].dst= dst;
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msgtable[next_slot].msg= *mp;
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msgtable[next_slot].flags= fl; /* Has to be last. The kernel
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* scans this table while we
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* are sleeping.
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*/
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next_slot++;
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assert(first_slot < ASYN_NR);
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assert(next_slot >= first_slot);
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len = next_slot-first_slot;
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assert(first_slot + len <= ASYN_NR);
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/* Tell the kernel to rescan the table */
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r = senda(msgtable+first_slot, len);
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inside = 0;
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return r;
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}
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