/**************************************************************************** * include/syslog.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __INCLUDE_SYSLOG_H #define __INCLUDE_SYSLOG_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* The option argument to openlog() is an OR of any of these: * * LOG_CONS - Write directly to system console if there is an error * while sending to system logger. * LOG_NDELAY - Open the connection immediately (normally, the connection * is opened when the first message is logged). * LOG_NOWAIT - Don't wait for child processes that may have been created * while logging the message. * LOG_ODELAY - The converse of LOG_NDELAY; opening of the connection is * delayed until syslog() is called. (This is the default, * and need not be specified.) * LOG_PERROR - (Not in POSIX.1-2001 or POSIX.1-2008.) Print to stderr * as well (Linux). * LOG_PID - Include PID with each message. */ /* Note: openlog() is not currently supported */ /* The facility argument is used to specify what type of program is logging * the message. This lets the configuration file specify that messages from * different facilities will be handled differently. * * LOG_AUTH - Security/authorization messages * LOG_AUTHPRIV - Security/authorization messages (private) * LOG_CRON - Clock daemon (cron and at) * LOG_DAEMON - System daemons without separate facility value * LOG_FTP - FTP daemon * LOG_KERN - Kernel messages (these can't be generated from user * processes) * LOG_LOCAL0 through LOG_LOCAL7 - Reserved for local use * LOG_LPR - Line printer subsystem * LOG_MAIL - Mail subsystem * LOG_NEWS - USENET news subsystem * LOG_SYSLOG - Messages generated internally by syslogd(8) * LOG_USER - Generic user-level messages (default) * LOG_UUCP - UUCP subsystem */ #define LOG_AUTH 0 #define LOG_AUTHPRIV 0 #define LOG_CRON 0 #define LOG_DAEMON 0 #define LOG_FTP 0 #define LOG_KERN 0 #define LOG_LOCAL0 0 #define LOG_LOCAL1 0 #define LOG_LOCAL2 0 #define LOG_LOCAL3 0 #define LOG_LOCAL4 0 #define LOG_LOCAL5 0 #define LOG_LOCAL6 0 #define LOG_LOCAL7 0 #define LOG_LPR 0 #define LOG_MAIL 0 #define LOG_NEWS 0 #define LOG_SYSLOG 0 #define LOG_USER 0 #define LOG_UUCP 0 /* This determines the importance of the message. The levels are, in order * of decreasing importance: */ #define LOG_EMERG 0 /* System is unusable */ #define LOG_ALERT 1 /* Action must be taken immediately */ #define LOG_CRIT 2 /* Critical conditions */ #define LOG_ERR 3 /* Error conditions */ #define LOG_WARNING 4 /* Warning conditions */ #define LOG_NOTICE 5 /* Normal, but significant, condition */ #define LOG_INFO 6 /* Informational message */ #define LOG_DEBUG 7 /* Debug-level message */ /* Used with setlogmask() */ #define LOG_MASK(p) (1 << (p)) #define LOG_UPTO(p) ((1 << ((p)+1)) - 1) #define LOG_ALL 0xff /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #if defined(__cplusplus) extern "C" { #endif /**************************************************************************** * Name: openlog * * Description: * The openlog() function sets process attributes that affect subsequent * calls to syslog(). The ident argument is a string that is prepended to * every message. The logopt argument indicates logging options. Values * for logopt are constructed by a bitwise-inclusive OR of zero or more of * the following: * * LOG_PID - Log the process ID with each message. This is useful for * identifying specific processes. * * LOG_CONS - Write messages to the system console if they cannot be * sent to the logging facility. The syslog() function ensures that * the process does not acquire the console as a controlling terminal * in the process of writing the message. * * LOG_NDELAY - Open the connection to the logging facility immediately. * Normally the open is delayed until the first message is logged. * This is useful for programs that need to manage the order in which * file descriptors are allocated. * * LOG_ODELAY - Delay open until syslog() is called. * * LOG_NOWAIT - Do not wait for child processes that may have been * created during the course of logging the message. This option * should be used by processes that enable notification of child * termination using SIGCHLD, since syslog() may otherwise block * waiting for a child whose exit status has already been collected. * * The facility argument encodes a default facility to be assigned to all * messages that do not have an explicit facility already encoded. The * initial default facility is LOG_USER. * * It is not necessary to call openlog() prior to calling syslog(). * ****************************************************************************/ #if 0 /* Not supported */ void openlog(FAR const char *ident, int option, int facility); #endif /**************************************************************************** * Name: closelog * * Description: * The openlog() and syslog() functions may allocate a file descriptor. * The closelog() function will close any open file descriptors allocated * by previous calls to openlog() or syslog(). * ****************************************************************************/ #if 0 /* Not supported */ void closelog(void); #endif /**************************************************************************** * Name: syslog and vsyslog * * Description: * syslog() generates a log message. The priority argument is formed by * ORing the facility and the level values (see include/syslog.h). The * remaining arguments are a format, as in printf and any arguments to the * format. * * The NuttX implementation does not support any special formatting * characters beyond those supported by printf. * * The function vsyslog() performs the same task as syslog() with the * difference that it takes a set of arguments which have been obtained * using the stdarg variable argument list macros. * ****************************************************************************/ void syslog(int priority, FAR const IPTR char *fmt, ...) syslog_like(2, 3); void vsyslog(int priority, FAR const IPTR char *fmt, va_list ap) syslog_like(2, 0); /**************************************************************************** * Name: setlogmask * * Description: * The setlogmask() function sets the logmask and returns the previous * mask. If the mask argument is 0, the current logmask is not modified. * * The SYSLOG priorities are: LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, * LOG_WARNING, LOG_NOTICE, LOG_INFO, and LOG_DEBUG. The bit corresponding * to a priority p is LOG_MASK(p); LOG_UPTO(p) provides the mask of all * priorities in the above list up to and including p. * * Per OpenGroup.org "If the maskpri argument is 0, the current log mask * is not modified." In this implementation, the value zero is permitted * in order to disable all syslog levels. * * NOTE: setlogmask is not a thread-safe, re-entrant function. Concurrent * use of setlogmask() will have undefined behavior. * * REVISIT: Per POSIX the syslog mask should be a per-process value but in * NuttX, the scope of the mask is dependent on the nature of the build: * * Flat Build: There is one, global SYSLOG mask that controls all output. * Protected Build: There are two SYSLOG masks. One within the kernel * that controls only kernel output. And one in user-space that controls * only user SYSLOG output. * Kernel Build: The kernel build is compliant with the POSIX requirement: * There will be one mask for for each user process, controlling the * SYSLOG output only form that process. There will be a separate mask * accessible only in the kernel code to control kernel SYSLOG output. * ****************************************************************************/ int setlogmask(int mask); #if defined(__cplusplus) } #endif #endif /* __INCLUDE_SYSLOG_H */