86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/****************************************************************************
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* libs/libc/syslog/lib_setlogmask.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <syslog.h>
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#include "syslog/syslog.h"
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* The currently enabled set of syslog priorities */
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uint8_t g_syslog_mask = LOG_ALL;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setlogmask
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*
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* Description:
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* The setlogmask() function sets the logmask and returns the previous
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* mask. If the mask argument is 0, the current logmask is not modified.
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*
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* The SYSLOG priorities are: LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR,
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* LOG_WARNING, LOG_NOTICE, LOG_INFO, and LOG_DEBUG. The bit corresponding
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* to a priority p is LOG_MASK(p); LOG_UPTO(p) provides the mask of all
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* priorities in the above list up to and including p.
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*
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* Per OpenGroup.org "If the maskpri argument is 0, the current log mask
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* is not modified." In this implementation, the value zero is permitted
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* in order to disable all syslog levels.
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*
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* NOTE: setlogmask is not a thread-safe, re-entrant function. Concurrent
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* use of setlogmask() will have undefined behavior.
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*
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* REVISIT: Per POSIX the syslog mask should be a per-process value but in
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* NuttX, the scope of the mask is dependent on the nature of the build:
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*
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* Flat Build: There is one, global SYSLOG mask that controls all output.
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* Protected Build: There are two SYSLOG masks. One within the kernel
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* that controls only kernel output. And one in user-space that controls
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* only user SYSLOG output.
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* Kernel Build: The kernel build is compliant with the POSIX requirement:
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* There will be one mask for each user process, controlling the SYSLOG
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* output only form that process. There will be a separate mask
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* accessible only in the kernel code to control kernel SYSLOG output.
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*
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****************************************************************************/
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int setlogmask(int mask)
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{
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uint8_t oldmask;
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oldmask = g_syslog_mask;
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g_syslog_mask = (uint8_t)mask;
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return oldmask;
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}
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