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48 lines
2.7 KiB
C
48 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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/**
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* Returns nice value of thing.
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*
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* Since -1 might be a valid return value for this API, it's necessary
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* to clear `errno` beforehand and see if it changed, in order to truly
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* determine if an error happened.
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*
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* @param which can be PRIO_PROCESS, PRIO_PGRP, PRIO_USER
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* @param who is the pid, pgid, or uid (0 means current)
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* @return value ∈ [-NZERO,NZERO) or -1 w/ errno
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* @see setpriority(), nice()
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*/
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int getpriority(int which, unsigned who) {
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int rc;
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if (!IsWindows()) {
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if ((rc = sys_getpriority(which, who)) != -1) {
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rc = 20 - rc;
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}
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} else {
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rc = sys_getsetpriority_nt(which, who, 0, sys_getpriority_nt);
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}
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STRACE("getpriority(%d, %u) → %d% m", which, who, rc);
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return rc;
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}
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