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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/* getpriority for Linux.
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Copyright (C) 1996-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/resource.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* The return value of getpriority syscall is biased by this value
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to avoid returning negative values. */
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#define PZERO 20
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/* Return the highest priority of any process specified by WHICH and WHO
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(see above); if WHO is zero, the current process, process group, or user
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(as specified by WHO) is used. A lower priority number means higher
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priority. Priorities range from PRIO_MIN to PRIO_MAX. */
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int
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__getpriority (enum __priority_which which, id_t who)
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{
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int res;
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res = INLINE_SYSCALL (getpriority, 2, (int) which, who);
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if (res >= 0)
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res = PZERO - res;
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return res;
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}
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libc_hidden_def (__getpriority)
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weak_alias (__getpriority, getpriority)
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