108 lines
4.3 KiB
C
108 lines
4.3 KiB
C
/****************************************************************************
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* lib/syslog/lib_setlogmask.c
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*
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* Copyright (C) 2007-2009, 2011-2012, 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <nuttx/irq.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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* 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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irqstate_t flags;
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/* These operations must be exclusive with respect to other threads as well
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* as interrupts.
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*/
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flags = enter_critical_section();
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oldmask = g_syslog_mask;
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g_syslog_mask = (uint8_t)mask;
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leave_critical_section(flags);
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return oldmask;
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}
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