freebsd-dev/lib/libsysdecode/sysdecode_utrace.3
John Baldwin d6fb489498 Start on a new library (libsysdecode) that provides routines for decoding
system call information such as system call arguments.  Initially this
will consist of pulling duplicated code out of truss and kdump though it
may prove useful for other utilities in the future.

This commit moves the shared utrace(2) record parser out of kdump into
the library and updates kdump and truss to use it.  One difference from
the previous version is that the library version treats unknown events
that start with the "RTLD" signature as unknown events.  This simplifies
the interface and allows the consumer to decide how to handle all
non-recognized events.  Instead, this function only generates a string
description for known malloc() and RTLD records.

Reviewed by:	bdrewery
Differential Revision:	https://reviews.freebsd.org/D4537
2015-12-15 00:05:07 +00:00

74 lines
2.3 KiB
Groff

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.Dd December 11, 2015
.Dt sysdecode_utrace 3
.Os
.Sh NAME
.Nm sysdecode_utrace
.Nd produce text description of a utrace record
.Sh LIBRARY
.Lb libsysdecode
.Sh SYNOPSIS
.Ft int
.Fn sysdecode_utrace "FILE *fp" "void *buf" "size_t len" "int decimal"
.Sh DESCRIPTION
The
.Fn sysdecode_utrace
function outputs a textual representation of a
.Xr utrace 2
record identified by
.Fa buf
and
.Fa len
to the output stream
.Fa fp .
.Pp
The function only outputs a representation for certain types of records.
If a record is recognized,
the function outputs the description and returns a non-zero value.
If the record is not recognized,
the function does not output anything and returns zero.
The
.Fn sysdecode_utrace
function currently recognizes
.Xr utrace 2
records generated by
.Xr malloc 3
and
.Xr rtld 1 .
.Sh RETURN VALUES
The
.Fn sysdecode_utrace
function returns a non-zero value if it recognizes a
.Xr utrace 2
record;
otherwise it returns zero.
.Sh SEE ALSO
.Xr utrace 2 ,
.Xr sysdecode 3