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TRACE_SETFILTER

Section: C Library Functions (3)     Updated: Feb 10, 1992    Return to Library's README

NAME

Trace_SetFilter -- filter a trace

SYNOPSIS

int Trace_SetFilter(fp, fileName)
FILE *fp;
char *fileName;

DESCRIPTION

Trace_SetFilter parses the filter specification in filename and applies it to the trace in file fp. All future calls to Trace_GetRecord will be subject to this filter, unless Trace_SetFilter is called again.

Filtering commands are as follows. Those in [] are optional.

*
end time The time after which all records will be filtered out. Any time acceptable to parsedate works. example: end Feb 25 14:00:00 1991
*
error ...list of error codes... example: error 0
*
inodetype Filters based on the inode (vnode) type of the object. Valid types are ufs, cfs, nfs, afs, bdev, spec.
*
matchfds This command applies to file-descriptor based trace records -- seek, close, read, and write. If matchfds occurs in the filter file, only those records that match an open with the same file descriptor will be presented. (Really, the file table index is used.)
*
opcode [include/exclude] ...list of opcodes... The string name of the desired opcode should be used. example: opcode open close read write seek If not set, all opcodes are returned. Inclusion is the default.
*
path [include/exclude] ...list of regexps... Filter based on the list of paths. Regular expressions of the form accepted by the regexp package work. For records with multiple paths, they are included or excluded if any of the paths in the records match.
*
pid [include/exclude] ...list of pids... Records are included or excluded based on the pid's membership in the supplied list. Include is the default.
*
refcount n A hack. Applies to close -- only those with the specified refcount will be presented. Useful for detecting a ``real'' close.
*
start time Records before time are filtered out. Any time acceptable to Parsedate works.
*
type ...list of file types... The file types are regular, directory, link, block, character, and socket.
*
user [include/exclude] ...list of numerical user ids... If include is specified, only those records that can be determined to have been written on behalf of the specified users will be presented. Similarly, The exclude option filters out records that can be determined to have been written on behalf of the specified user. Inclusion is the default. example: user include 2208

Use only one of each command in a filter file.

Filters are intended to give the trace user a mechanism for processing traces in a variety of ways using a given program. If an analysis program only looks at certain types of records (such as CLOSEs), then that should be coded into the analysis program (i.e., the program's requirements for records should not be specified in a filter).

DIAGNOSTICS

Returns TRACE_FILERECORDNOTFOUND if fp is not an open trace. Returns TRACE_FILENOTFOUND if the filter file cannot be opened for read access. Otherwise, returns TRACE_SUCCESS.

AUTHOR

Lily B. Mummert

Index

NAME
SYNOPSIS
DESCRIPTION
DIAGNOSTICS
AUTHOR
This document was created on Time: 05:25:53 GMT, October 10, 1998