47 lines
764 B
C
47 lines
764 B
C
/*
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priority.c
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*/
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/resource.h>
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#include <lib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stddef.h>
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int getpriority(int which, int who)
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{
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int v;
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message m;
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m.m1_i1 = which;
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m.m1_i2 = who;
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/* GETPRIORITY returns negative for error.
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* Otherwise, it returns the priority plus the minimum
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* priority, to distiginuish from error. We have to
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* correct for this. (The user program has to check errno
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* to see if something really went wrong.)
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*/
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if((v = _syscall(MM, GETPRIORITY, &m)) < 0) {
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return v;
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}
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return v + PRIO_MIN;
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}
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int setpriority(int which, int who, int prio)
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{
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message m;
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m.m1_i1 = which;
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m.m1_i2 = who;
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m.m1_i3 = prio;
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return _syscall(MM, SETPRIORITY, &m);
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}
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