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59 lines
1.2 KiB
59 lines
1.2 KiB
/* kill.c - kill */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* kill - Kill a process and remove it from the system |
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*------------------------------------------------------------------------ |
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*/ |
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syscall kill( |
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pid32 pid /* ID of process to kill */ |
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) |
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{ |
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intmask mask; /* Saved interrupt mask */ |
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struct procent *prptr; /* Ptr to process's table entry */ |
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int32 i; /* Index into descriptors */ |
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mask = disable(); |
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if (isbadpid(pid) || (pid == NULLPROC) |
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|| ((prptr = &proctab[pid])->prstate) == PR_FREE) { |
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restore(mask); |
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return SYSERR; |
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} |
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if (--prcount <= 1) { /* Last user process completes */ |
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xdone(); |
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} |
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send(prptr->prparent, pid); |
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for (i=0; i<3; i++) { |
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close(prptr->prdesc[i]); |
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} |
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freestk(prptr->prstkbase, prptr->prstklen); |
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switch (prptr->prstate) { |
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case PR_CURR: |
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prptr->prstate = PR_FREE; /* Suicide */ |
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resched(); |
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case PR_SLEEP: |
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case PR_RECTIM: |
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unsleep(pid); |
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prptr->prstate = PR_FREE; |
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break; |
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case PR_WAIT: |
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semtab[prptr->prsem].scount++; |
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/* Fall through */ |
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case PR_READY: |
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getitem(pid); /* Remove from queue */ |
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/* Fall through */ |
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default: |
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prptr->prstate = PR_FREE; |
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} |
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restore(mask); |
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return OK; |
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}
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