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Don't follow non existant thread pointers (e.g. for zombies)

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This commit is contained in:
Julian Elischer 2002-06-30 08:11:30 +00:00
parent d2be885e99
commit 6143c38376
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=99128
1 changed files with 35 additions and 33 deletions
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68
lib/libkvm/kvm_proc.c
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@ -268,7 +268,7 @@ kvm_proclist(kd, what, arg, p, bp, maxcnt)
nopgrp:
kp->ki_tdev = NODEV;
}
if (mainthread.td_wmesg) /* XXXKSE */
if (mainthread && mainthread.td_wmesg) /* XXXKSE */
(void)kvm_read(kd, (u_long)mainthread.td_wmesg,
kp->ki_wmesg, WMESGLEN);
@ -307,7 +307,7 @@ kvm_proclist(kd, what, arg, p, bp, maxcnt)
strncpy(kp->ki_comm, proc.p_comm, MAXCOMLEN);
kp->ki_comm[MAXCOMLEN] = 0;
}
if (mainthread.td_blocked != 0) { /* XXXKSE */
if (mainthread && mainthread.td_blocked != 0) { /* XXXKSE */
kp->ki_kiflag |= KI_MTXBLOCK;
if (mainthread.td_mtxname) /* XXXKSE */
(void)kvm_read(kd, (u_long)mainthread.td_mtxname,
@ -321,41 +321,43 @@ kvm_proclist(kd, what, arg, p, bp, maxcnt)
kp->ki_sigmask = proc.p_sigmask;
kp->ki_xstat = proc.p_xstat;
kp->ki_acflag = proc.p_acflag;
kp->ki_pctcpu = proc.p_kse.ke_pctcpu; /* XXXKSE */
kp->ki_estcpu = proc.p_ksegrp.kg_estcpu; /* XXXKSE */
kp->ki_slptime = proc.p_kse.ke_slptime; /* XXXKSE */
kp->ki_swtime = proc.p_swtime;
kp->ki_flag = proc.p_flag; /* WILDLY INNACURATE XXXKSE */
kp->ki_sflag = proc.p_sflag;
kp->ki_wchan = mainthread.td_wchan; /* XXXKSE */
kp->ki_traceflag = proc.p_traceflag;
if (proc.p_state == PRS_NORMAL) { /* XXXKSE very aproximate */
if ((mainthread.td_state == TDS_RUNQ) ||
(mainthread.td_state == TDS_RUNNING)) {
kp->ki_stat = SRUN;
} else if (mainthread.td_state == TDS_SLP) {
kp->ki_stat = SSLEEP;
} else if (P_SHOULDSTOP(&proc)) {
kp->ki_stat = SSTOP;
} else if (mainthread.td_state == TDS_MTX) {
kp->ki_stat = SMTX;
if (mainthread) {
kp->ki_pctcpu = proc.p_kse.ke_pctcpu;
kp->ki_estcpu = proc.p_ksegrp.kg_estcpu;
kp->ki_slptime = proc.p_kse.ke_slptime;
kp->ki_swtime = proc.p_swtime;
kp->ki_flag = proc.p_flag;
kp->ki_sflag = proc.p_sflag;
kp->ki_wchan = mainthread.td_wchan;
kp->ki_traceflag = proc.p_traceflag;
if (proc.p_state == PRS_NORMAL) {
if ((mainthread.td_state == TDS_RUNQ) ||
(mainthread.td_state == TDS_RUNNING)) {
kp->ki_stat = SRUN;
} else if (mainthread.td_state == TDS_SLP) {
kp->ki_stat = SSLEEP;
} else if (P_SHOULDSTOP(&proc)) {
kp->ki_stat = SSTOP;
} else if (mainthread.td_state == TDS_MTX) {
kp->ki_stat = SMTX;
} else {
kp->ki_stat = SWAIT;
}
} else {
kp->ki_stat = SWAIT;
kp->ki_stat = SIDL;
}
} else if (proc.p_state == PRS_ZOMBIE) {
kp->ki_stat = SZOMB;
kp->ki_pri.pri_class = proc.p_ksegrp.kg_pri_class;
kp->ki_pri.pri_user = proc.p_ksegrp.kg_user_pri;
kp->ki_pri.pri_level = mainthread.td_priority;
kp->ki_pri.pri_native = mainthread.td_base_pri;
kp->ki_nice = proc.p_ksegrp.kg_nice;
kp->ki_lock = proc.p_lock;
kp->ki_rqindex = proc.p_kse.ke_rqindex;
kp->ki_oncpu = proc.p_kse.ke_oncpu;
kp->ki_lastcpu = mainthread.td_lastcpu;
} else {
kp->ki_stat = SIDL;
kp->ki_stat = SZOMB;
}
kp->ki_pri.pri_class = proc.p_ksegrp.kg_pri_class; /* XXXKSE */
kp->ki_pri.pri_user = proc.p_ksegrp.kg_user_pri; /* XXXKSE */
kp->ki_pri.pri_level = mainthread.td_priority; /* XXXKSE */
kp->ki_pri.pri_native = mainthread.td_base_pri; /* XXXKSE */
kp->ki_nice = proc.p_ksegrp.kg_nice; /* XXXKSE */
kp->ki_lock = proc.p_lock;
kp->ki_rqindex = proc.p_kse.ke_rqindex; /* XXXKSE */
kp->ki_oncpu = proc.p_kse.ke_oncpu; /* XXXKSE */
kp->ki_lastcpu = mainthread.td_lastcpu; /* XXXKSE */
bcopy(&kinfo_proc, bp, sizeof(kinfo_proc));
++bp;
++cnt;