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- SYSLOG C Library Procedures SYSLOG
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- NNAAMMEE
- syslog, openlog, closelog, setlogmask - control system log
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- SSYYNNOOPPSSIISS
- ##iinncclluuddee <<ssyysslloogg..hh>>
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- ooppeennlloogg((iiddeenntt,, llooggoopptt,, ffaacciilliittyy))
- cchhaarr **iiddeenntt;;
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- ssyysslloogg((pprriioorriittyy,, mmeessssaaggee,, ppaarraammeetteerrss ...... ))
- cchhaarr **mmeessssaaggee;;
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- cclloosseelloogg(())
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- sseettllooggmmaasskk((mmaasskkpprrii))
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- DDEESSCCRRIIPPTTIIOONN
- _S_y_s_l_o_g arranges to write _m_e_s_s_a_g_e onto the system log main-
- tained by _s_y_s_l_o_g_d(8). The message is tagged with _p_r_i_o_r_i_t_y.
- The message looks like a _p_r_i_n_t_f(3) string except that %%mm is
- replaced by the current error message (collected from
- _e_r_r_n_o). A trailing newline is added if needed. This mes-
- sage will be read by _s_y_s_l_o_g_d(8) and written to the system
- console, log files, or forwarded to _s_y_s_l_o_g_d on another host
- as appropriate.
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- Priorities are encoded as a _f_a_c_i_l_i_t_y and a _l_e_v_e_l. The
- facility describes the part of the system generating the
- message. The level is selected from an ordered list:
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- LOG_EMERG A panic condition. This is normally broadcast
- to all users.
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- LOG_ALERT A condition that should be corrected immedi-
- ately, such as a corrupted system database.
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- LOG_CRIT Critical conditions, e.g., hard device errors.
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- LOG_ERR Errors.
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- LOG_WARNING Warning messages.
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- LOG_NOTICE Conditions that are not error conditions, but
- should possibly be handled specially.
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- LOG_INFO Informational messages.
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- LOG_DEBUG Messages that contain information normally of
- use only when debugging a program.
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- If _s_y_s_l_o_g cannot pass the message to _s_y_s_l_o_g_d, it will
- attempt to write the message on /_d_e_v/_c_o_n_s_o_l_e if the LOG_CONS
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- SYSLOG C Library Procedures SYSLOG
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- option is set (see below).
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- If special processing is needed, _o_p_e_n_l_o_g can be called to
- initialize the log file. The parameter _i_d_e_n_t is a string
- that is prepended to every message. _L_o_g_o_p_t is a bit field
- indicating logging options. Current values for _l_o_g_o_p_t are:
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- LOG_PID log the process id with each message: useful
- for identifying instantiations of daemons.
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- LOG_CONS Force writing messages to the console if
- unable to send it to _s_y_s_l_o_g_d. This option is
- safe to use in daemon processes that have no
- controlling terminal since _s_y_s_l_o_g will fork
- before opening the console.
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- LOG_NDELAY Open the connection to _s_y_s_l_o_g_d immediately.
- Normally the open is delayed until the first
- message is logged. Useful for programs that
- need to manage the order in which file
- descriptors are allocated.
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- LOG_NOWAIT Don't wait for children forked to log messages
- on the console. This option should be used by
- processes that enable notification of child
- termination via SIGCHLD, as _s_y_s_l_o_g may other-
- wise block waiting for a child whose exit
- status has already been collected.
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- The _f_a_c_i_l_i_t_y parameter encodes a default facility to be
- assigned to all messages that do not have an explicit facil-
- ity encoded:
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- LOG_KERN Messages generated by the kernel. These can-
- not be generated by any user processes.
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- LOG_USER Messages generated by random user processes.
- This is the default facility identifier if
- none is specified.
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- LOG_MAIL The mail system.
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- LOG_DAEMON System daemons, such as _f_t_p_d(8), _r_o_u_t_e_d(8),
- etc.
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- LOG_AUTH The authorization system: _l_o_g_i_n(1), _s_u(1),
- _g_e_t_t_y(8), etc.
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- LOG_LPR The line printer spooling system: _l_p_r(1),
- _l_p_c(8), _l_p_d(8), etc.
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- LOG_LOCAL0 Reserved for local use. Similarly for
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- SYSLOG C Library Procedures SYSLOG
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- LOG_LOCAL1 through LOG_LOCAL7.
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- _C_l_o_s_e_l_o_g can be used to close the log file.
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- _S_e_t_l_o_g_m_a_s_k sets the log priority mask to _m_a_s_k_p_r_i and returns
- the previous mask. Calls to _s_y_s_l_o_g with a priority not set
- in _m_a_s_k_p_r_i are rejected. The mask for an individual prior-
- ity _p_r_i is calculated by the macro LOG_MASK(_p_r_i); the mask
- for all priorities up to and including _t_o_p_p_r_i is given by
- the macro LOG_UPTO(_t_o_p_p_r_i). The default allows all priori-
- ties to be logged.
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- EEXXAAMMPPLLEESS
- syslog(LOG_ALERT, "who: internal error 23");
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- openlog("ftpd", LOG_PID, LOG_DAEMON);
- setlogmask(LOG_UPTO(LOG_ERR));
- syslog(LOG_INFO, "Connection from host %d", CallingHost);
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- syslog(LOG_INFO|LOG_LOCAL2, "foobar error: %m");
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- SSEEEE AALLSSOO
- logger(1), syslogd(8)
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