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Updated file based upon red-lines received.

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Wade A Smith
1998-09-21 21:31:59 +00:00
parent af973e57f3
commit f8c5badb5c
1 changed files with 110 additions and 121 deletions
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231
doc/new_chapters/eventlog.t
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@@ -42,39 +42,40 @@ The directives provided by the event logging manager are:
@subsection Log Files and Events
The operating system uses a special log file named @code{XXX}.
The operating system uses a special log file named @code{syslog}.
This log file is called the system log and is automatically created and
tracked by the operating system. The system log is written to with
the @code{log_write} function. An alternative log file may be written
using the @code{log_write_any} function. It is possible to use @code{log_read}
to query the system and @code{log_write_entry} to a non-system log file
to produce a filtered version of the system log. For example you could
produce a log of all disk controller faults that have occurred.
tracked by the operating system. The system log is written with
the @code{log_write()} function. An alternative log file may be written
using the @code{log_write_any()} function. It is possible to use @code{log_read()}
to query the system log and and write the records to a non-system log file
using @code{log_write_entry()} to produce a filtered version of the
system log. For example you could produce a log of all disk controller
faults that have occurred.
A non-system log may be a special log file created by an application to
describe application faults, or a subset of the system log created
by the application.
@subsection Facilities, Severity, & Queries
A facility is an identification code for a subsystem, device, or
other object about which information is being written to
a log file. Severity is a rating of the error that is being logged.
The facility identifier and the event severity are the basis for
subsequent log query. A log query is used as a filter to
obtain a subset of a given log file. The log file may be configured
to send out an event ... ???
XXX Events
@subsection Queries
to send out an event.
@section Operations
@subsection Creating and Writing a non-System Log
The following snips of code create a non-System log file at /temp/.
A previously read entry and buffer (log_buf) of size readsize are written
into the log. See the dicussion on opening and reading a log for
how the entry is created.
The following code fragment create a non-System log file at /temp/.
A real filename previously read entry and buffer @code{log_buf} of size
@code{readsize} are written into the log. See the discussion on opening
and reading a log for how the entry is created.
@example
#include <evlog.h>
@@ -144,7 +145,7 @@ The @code{severity} argument exceeds @code{LOG_SEVERITY_MAX}.
The @code{len} argument exceeds @code{LOG_MAXIUM_BUFFER_SIZE}.
@item EINVAL
The @code{len} argument was non-zero and @code{buf} is NULL.
The @code{len} argument was non-zero and @code{buf} is @code{NULL}.
@item ENOSPC
The device which contains the log file has run out of space.
@@ -156,7 +157,7 @@ An I/O error occurred in writing to the log file.
@subheading DESCRIPTION:
The @code{log_write_any} function writes an event record to the
The @code{log_write} function writes an event record to the
system log file. The event record written consists of the
event attributes specified by the @code{facility}, @code{event_id},
and @code{severity} arguments as well as the data identified by the
@@ -181,20 +182,20 @@ This is set to the value of the @code{facility} argument.
This is set to the value of the @code{severity} argument.
@item log_uid
This is set to the value returned by @code{geteuid}.
This is set to the value returned by @code{geteuid()}.
@item log_gid
This is set to the value returned by @code{getegid}.
This is set to the value returned by @code{getegid()}.
@item log_pid
This is set to the value returned by @code{getpid}.
This is set to the value returned by @code{getpid()}.
@item log_pgrp
This is set to the value returned by @code{getpgrp}.
This is set to the value returned by @code{getpgrp()}.
@item log_time
This is set to the value returned by @code{clock_gettime} for the
CLOCK_REALTIME clock source.
This is set to the value returned by @code{clock_gettime()} for the
@code{CLOCK_REALTIME clock} source.
@end table
@@ -248,7 +249,7 @@ The @code{severity} argument exceeds @code{LOG_SEVERITY_MAX}.
The @code{len} argument exceeds @code{LOG_MAXIMUM_BUFFER_SIZE}.
@item EINVAL
The @code{len} argument was non-zero and @code{buf} is NULL.
The @code{len} argument was non-zero and @code{buf} is @code{NULL}.
@item ENOSPC
The device which contains the log file has run out of space.
@@ -260,7 +261,7 @@ An I/O error occurred in writing to the log file.
@subheading DESCRIPTION:
The @code{log_write_any} function writes an event record to the log file
The @code{log_write_any()} function writes an event record to the log file
specified by @code{logdes}. The event record written consists of the
event attributes specified by the @code{facility}, @code{event_id},
and @code{severity} arguments as well as the data identified by the
@@ -285,20 +286,20 @@ This is set to the value of the @code{facility} argument.
This is set to the value of the @code{severity} argument.
@item log_uid
This is set to the value returned by @code{geteuid}.
This is set to the value returned by @code{geteuid()}.
@item log_gid
This is set to the value returned by @code{getegid}.
This is set to the value returned by @code{getegid()}.
@item log_pid
This is set to the value returned by @code{getpid}.
This is set to the value returned by @code{getpid()}.
@item log_pgrp
This is set to the value returned by @code{getpgrp}.
This is set to the value returned by @code{getpgrp()}.
@item log_time
This is set to the value returned by @code{clock_gettime} for the
CLOCK_REALTIME clock source.
This is set to the value returned by @code{clock_gettime()} for the
@code{CLOCK_REALTIME} clock source.
@end table
@@ -368,7 +369,7 @@ An I/O error occurred in writing to the log file.
@subheading DESCRIPTION:
The @code{log_write_entry} function writes an event record
The @code{log_write_entry()} function writes an event record
specified by the @code{entry}, @code{buf}, and @code{len} arguments.
Most of the fields of the event record pointed to by @code{entry}
are left intact. The following fields are filled in as follows:
@@ -424,7 +425,7 @@ Search permission is denied on a component of the path prefix,
or the log file exists and read permission is denied.
@item EINTR
A signal interrupted the call to log_open().
A signal interrupted the call to @code{log_open()}.
@item EINVAL
The log_severity field of the query argument exceeds
@@ -455,24 +456,24 @@ A component of the path prefix is not a directory.
@subheading DESCRIPTION:
The @code{log_open} function establishes the connection between a
The @code{log_open()} function establishes the connection between a
log file and a log file descriptor. It creates an open log file
descriptor that refers to this query stream on the specified log file
The log file descriptor is used by the other log functions to refer
to that log query stream. The @code{path} argument points to a
pathname for a log file. A @code{path} argument of NULL specifies
pathname for a log file. A @code{path} argument of @code{NULL} specifies
the current system log file.
The @code{query} argument is not NULL, then it points to a log query
The @code{query} argument is not @code{NULL}, then it points to a log query
specification that is used to filter the records in the log file on
subsequent @code{log_read} operations. This restricts the set of
subsequent @code{log_read()} operations. This restricts the set of
event records read using the returned log file descriptor to those
which match the query. A query match occurs for a given record when
that record's facility is a member of the query's facility set and
the record's severity is greater than or equal to the severity specified
in the query.
If the value of the @code{query} argument is NULL, no query filter
If the value of the @code{query} argument is @code{NULL}, no query filter
shall be applied.
@subheading NOTES:
@@ -485,9 +486,9 @@ POSIX specifies that @code{EINVAL} will be returned if the
a valid facility set. In this implementation, this condition
can never occur.
Many error codes that POSIX specifies to be returned by @code{log_open}
should actually be detected by @code{open} and passed back by the
@code{log_open} implementation. In this implementation, @code{EACCESS},
Many error codes that POSIX specifies to be returned by @code{log_open()}
should actually be detected by @code{open()} and passed back by the
@code{log_open()} implementation. In this implementation, @code{EACCESS},
@code{EMFILE}, @code{ENAMETOOLONG}, @code{ENFILE}, @code{ENOENT},
and @code{ENOTDIR} are detected in this manner.
@@ -551,7 +552,7 @@ longer than @code{log_len}.
@subheading DESCRIPTION:
The @code{log_read} function reads the @code{log_entry}
The @code{log_read()} function reads the @code{log_entry}
structure and up to @code{log_len} bytes of data from the next
event record of the log file associated with the open log file
descriptor @code{logdes}. The event record read is placed
@@ -564,7 +565,7 @@ record.
If the query attribute of the open log file description associated with
the @code{logdes} is set, the event record read will match that query.
If the @code{log_read} is successful the call stores the actual length
If the @code{log_read()} is successful the call stores the actual length
of the data associated with the event record into the location specified by
@code{log_sizeread}. This number will be less than or equal to
@code{log_len}.
@@ -577,7 +578,7 @@ this service is available.
When @code{EINVAL} is returned, then no data is returned although the
event record is returned. This is an extension to the POSIX specification.
The POSIX specification specifically allows @code{log_read} to write
The POSIX specification specifically allows @code{log_read()} to write
greater than @code{log_len} bytes into @code{log_buf}. This is highly
undesirable and this implementation will NOT do this.
@@ -620,7 +621,7 @@ The function log_notify() is not supported by this implementation.
@subheading DESCRIPTION:
If the argument @code{notification} is not NULL this function registers
If the argument @code{notification} is not @code{NULL} this function registers
the calling process to be notified of event records received by the system
log, which match the query parameters associated with the open log descriptor
specified by @code{logdes}. The notification specified by the
@@ -631,7 +632,7 @@ descriptor. If the calling process has already registered a notification
for the @code{logdes} log file descriptor, the new notification shall
replace the existing notification registration.
If the @code{notification} argument is NULL and the calling process is
If the @code{notification} argument is @code{NULL} and the calling process is
currently registered to be notified for the @code{logdes} log file
descriptor, the existing registration shall be removed.
@@ -668,7 +669,7 @@ The logdes argument is not a valid log file descriptor.
@subheading DESCRIPTION:
The @code{log_close} function deallocates the open log file descriptor
The @code{log_close()} function deallocates the open log file descriptor
indicated by @code{log_des}.
When all log file descriptors associated with an open log file description
@@ -717,11 +718,12 @@ The @code{log_recid} argument is not a valid record id.
@subheading DESCRIPTION:
The @code{log_seek} function sets the log file offset of the open
The @code{log_seek()} function sets the log file offset of the open
log description associated with the @code{logdes} log file descriptor
to the event record in the log file identified by @code{log_recid}.
The @code{log_recid} argument is either the record id of a valid event
record or one of the following values, as defined in the header <evlog.h>:
record or one of the following values, as defined in the header file
@code{<evlog.h>:}
@table @b
@item LOG_SEEK_START
@@ -739,9 +741,9 @@ record in the log file.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
This implementation can not return @code{EINTR}.
This implementation can not return EINTR.
This implementation can not return @code{EINVAL} to indicate that
This implementation can not return EINVAL to indicate that
the @code{log_recid} argument is not a valid record id.
@page
@@ -779,13 +781,13 @@ The value of either s1 or s2 exceeds @code{LOG_SEVERITY_MAX}.
@subheading DESCRIPTION:
The @code{log_severity_before} function compares the severity order
The @code{log_severity_before()} function compares the severity order
of the @code{s1} and @code{s2} arguments. If @code{s1} is of
severity greater than or equal to that of @code{s2}, then this
function returns 1. Otherwise, it returns 0.
If either @code{s1} or @code{s2} specify invalid severity values, the
return value of @code{log_severity_before} is unspecified.
return value of @code{log_severity_before()} is unspecified.
@subheading NOTES:
@@ -793,7 +795,7 @@ The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
The POSIX specification of the return value for this function is ambiguous.
If @code{EINVAL} is equal to 1 in an implementation, then the application
If EINVAL is equal to 1 in an implementation, then the application
can not distinguish between greater than and an error condition.
@page
@@ -824,7 +826,7 @@ The @code{set} argument is an invalid pointer.
@subheading DESCRIPTION:
The @code{log_facilityemptyset} function initializes the facility
The @code{log_facilityemptyset()} function initializes the facility
set pointed to by the argument @code{set}, such that all facilities
are excluded.
@@ -833,13 +835,13 @@ are excluded.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_facilityfillset - Manipulate log facility sets
@@ -869,7 +871,7 @@ The @code{set} argument is an invalid pointer.
@subheading DESCRIPTION:
The @code{log_facilityfillset} function initializes the facility
The @code{log_facilityfillset()} function initializes the facility
set pointed to by the argument @code{set}, such that all facilities
are included.
@@ -878,13 +880,13 @@ are included.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_facilityaddset - Manipulate log facility sets
@@ -918,7 +920,7 @@ The @code{facilityno} argument is not a valid facility.
@subheading DESCRIPTION:
The @code{log_facilityaddset} function adds the individual
The @code{log_facilityaddset()} function adds the individual
facility specified by the value of the argument @code{facilityno}
to the facility set pointed to by the argument @code{set}.
@@ -927,13 +929,13 @@ to the facility set pointed to by the argument @code{set}.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_facilitydelset - Manipulate log facility sets
@@ -967,7 +969,7 @@ The @code{facilityno} argument is not a valid facility.
@subheading DESCRIPTION:
The @code{log_facilitydelset} function deletes the individual
The @code{log_facilitydelset()} function deletes the individual
facility specified by the value of the argument @code{facilityno}
from the facility set pointed to by the argument @code{set}.
@@ -976,13 +978,13 @@ from the facility set pointed to by the argument @code{set}.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_facilityismember - Manipulate log facility sets
@@ -1017,10 +1019,10 @@ The @code{facilityno} argument is not a valid facility.
@subheading DESCRIPTION:
The @code{log_facilityismember} function tests whether the facility
The @code{log_facilityismember()} function tests whether the facility
specified by the value of the argument @code{facilityno} is a member
of the set pointed to by the argument @code{set}. Upon successful
completion, the @code{log_facilityismember} function either returns
completion, the @code{log_facilityismember()} function either returns
a value of one to the location specified by @code{member} if the
specified facility is a member of the specified set or value of
zero to the location specified by @code{member} if the specified
@@ -1031,16 +1033,16 @@ facility is not a member of the specified set.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_facilityismember - Manipulate log facility sets
@subsection log_facilityisvalid - Manipulate log facility sets
@subheading CALLING SEQUENCE:
@@ -1070,10 +1072,10 @@ The @code{facilityno} argument is not a valid facility.
@subheading DESCRIPTION:
The @code{log_facilityisvalid} function tests whether the facility
The @code{log_facilityisvalid()} function tests whether the facility
specified by the value of the argument @code{facilityno} is a valid
facility number which is less than 32. Upon successful completion,
the @code{log_facilityisvalid} function either returns a value of
facility number. Upon successful completion, the
the @code{log_facilityisvalid()} function either returns a value of
0 if the specified facility is a valid facility or value of EINVAL
if the specified facility is not a valid facility.
@@ -1082,13 +1084,13 @@ if the specified facility is not a valid facility.
The @code{_POSIX_LOGGING} feature flag is defined to indicate
this service is available.
Applications shall call either @code{log_facilityemptyset} or
@code{log_facilityfillset} at least once for each object of type
Applications shall call either @code{log_facilityemptyset()} or
@code{log_facilityfillset()} at least once for each object of type
@code{log_facilityset_t} prior to any other use of that object. If
such an object is not initialized in this way, but is nonetheless
supplied as an argument to any of the @code{log_facilityaddset},
@code{logfacilitydelset}, @code{log_facilityismember} or
@code{log_open} functions, the results are undefined.
supplied as an argument to any of the @code{log_facilityaddset()},
@code{logfacilitydelset()}, @code{log_facilityismember()} or
@code{log_open()} functions, the results are undefined.
@page
@subsection log_create - Creates a log file
@@ -1113,61 +1115,48 @@ int log_create(
@table @b
@item
EEXIST
@item EEXIST
The @code{path} already exists and O_CREAT and O_EXCL were used.
@item
EISDIR
@item EISDIR
The @code{path} refers to a directory and the access requested involved
writing.
@item
ETXTBSY
@item ETXTBSY
The @code{path} refers to an executable image which is currently being
executed and write access was requested.
@item
EFAULT
@item EFAULT
The @code{path} points outside your accessible address space.
@item
EACCES
@item EACCES
The requested access to the file is not allowed, or one of the
directories in @code{path} did not allow search (execute) permission.
@item
ENAMETOOLONG
@item ENAMETOOLONG
The @code{path} was too long.
@item
ENOENT
@item ENOENT
A directory component in @code{path} does not exist or is a dangling symbolic
link.
@item
ENOTDIR
@item ENOTDIR
A component used as a directory in @code{path} is not, in fact, a directory.
@item
EMFILE
@item EMFILE
The process already has the maximum number of files open.
@item
ENFILE
@item ENFILE
The limit on the total number of files open on the system has been reached.
@item
ENOMEM
@item ENOMEM
Insufficient kernel memory was available.
@item
EROFS
@item EROFS
The @code{path} refers to a file on a read-only filesystem and write access
was requested.
@item
ELOOP
@item ELOOP
The @code{path} contains a reference to a circular symbolic link, ie a
symbolic link whose expansion contains a reference to itself.