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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
90 lines
3.9 KiB
C
90 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/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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#include "libc/errno.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/limits.h"
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#include "libc/sysv/errfuns.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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* On Windows, there's only six priority classes. We define them as -16
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* (realtime), -10 (high), -5 (above), 0 (normal), 5 (below), 15 (idle)
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* which are the only values that'll roundtrip getpriority/setpriority.
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*
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* @param which can be one of:
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* - `PRIO_PROCESS` is supported universally
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* - `PRIO_PGRP` is supported on unix
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* - `PRIO_USER` is supported on unix
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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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* @raise EINVAL if `which` was invalid or unsupported
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* @raise EPERM if access to process was denied
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* @raise ESRCH if no such process existed
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* @see setpriority()
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*/
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int getpriority(int which, unsigned who) {
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int rc;
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#ifdef __x86_64__
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char cf;
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if (IsLinux()) {
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asm volatile("syscall"
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: "=a"(rc)
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: "0"(140), "D"(which), "S"(who)
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: "rcx", "r11", "memory");
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if (rc >= 0) {
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rc = NZERO - rc;
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} else {
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errno = -rc;
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rc = -1;
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}
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} else if (IsBsd()) {
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asm volatile(CFLAG_ASM("syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(rc)
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: "1"((IsXnu() ? 0x2000000 : 0) | 100), "D"(which), "S"(who)
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: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory");
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if (cf) {
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errno = rc;
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rc = -1;
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}
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} else if (IsWindows()) {
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rc = sys_getpriority_nt(which, who);
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} else {
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rc = enosys();
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}
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#else
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rc = sys_getpriority(which, who);
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if (rc != -1) {
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rc = NZERO - rc;
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}
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#endif
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STRACE("getpriority(%s, %u) → %d% m", DescribeWhichPrio(which), who, rc);
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return rc;
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}
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