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#include <unistd.h>
#include <errno.h>
#include <sys/resource.h>
#include <limits.h>
#include "syscall.h"
int nice(int inc)
{
int prio = inc;
// Only query old priority if it can affect the result.
// This also avoids issues with integer overflow.
if (inc > -2*NZERO && inc < 2*NZERO)
prio += getpriority(PRIO_PROCESS, 0);
if (prio > NZERO-1) prio = NZERO-1;
if (prio < -NZERO) prio = -NZERO;
if (setpriority(PRIO_PROCESS, 0, prio)) {
if (errno == EACCES)
errno = EPERM;
return -1;
} else {
return prio;
}
}
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