47 lines
836 B
C
Executable File
47 lines
836 B
C
Executable File
#pragma ident "@(#)nice.c 1.9 92/07/21 SMI"
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/* from UCB 4.1 83/05/30 */
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <errno.h>
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/*
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* Backwards compatible nice.
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*/
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int
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nice(incr)
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int incr;
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{
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register int prio;
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int serrno;
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/* put in brain-damaged upper range checking */
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if ((incr > 40) && (geteuid() != 0)) {
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errno = EPERM;
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return (-1);
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}
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serrno = errno;
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errno = 0;
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prio = getpriority(PRIO_PROCESS, 0);
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if (prio == -1 && errno)
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return (-1);
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prio += incr;
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if (prio < -20)
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prio = -20;
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else if (prio > 19)
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prio = 19;
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if (setpriority(PRIO_PROCESS, 0, prio) == -1) {
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/*
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* 4.3BSD stupidly returns EACCES on an attempt by a
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* non-super-user process to lower a priority; map
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* it to EPERM.
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*/
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if (errno == EACCES)
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errno = EPERM;
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return (-1);
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}
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errno = serrno;
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return (prio);
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}
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