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mx1.freebsd.org; none Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4dVNvr2t75z9FK for ; Mon, 15 Dec 2025 15:17:12 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 3a650 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Mon, 15 Dec 2025 15:17:12 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mateusz Piotrowski <0mp@FreeBSD.org> Subject: git: ff6b04c37e78 - stable/14 - dtrace_pid.4: Document the DTrace PID provider List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: 0mp X-Git-Repository: src X-Git-Refname: refs/heads/stable/14 X-Git-Reftype: branch X-Git-Commit: ff6b04c37e780e070d871dff60370a0376efde4c Auto-Submitted: auto-generated Date: Mon, 15 Dec 2025 15:17:12 +0000 Message-Id: <69402678.3a650.774f87d@gitrepo.freebsd.org> The branch stable/14 has been updated by 0mp: URL: https://cgit.FreeBSD.org/src/commit/?id=ff6b04c37e780e070d871dff60370a0376efde4c commit ff6b04c37e780e070d871dff60370a0376efde4c Author: Mateusz Piotrowski <0mp@FreeBSD.org> AuthorDate: 2025-11-06 22:40:41 +0000 Commit: Mateusz Piotrowski <0mp@FreeBSD.org> CommitDate: 2025-12-15 15:16:58 +0000 dtrace_pid.4: Document the DTrace PID provider MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D51287 (cherry picked from commit 9fe88e5503239cb65e503e3b2b7344933a888644) --- cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 | 1 + share/man/man4/Makefile | 1 + share/man/man4/dtrace_pid.4 | 99 ++++++++++++++++++++++++++++ 3 files changed, 101 insertions(+) diff --git a/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 b/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 index ba462823a823..cefa17fd6758 100644 --- a/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 +++ b/cddl/contrib/opensolaris/cmd/dtrace/dtrace.1 @@ -1305,6 +1305,7 @@ in .Xr dtrace_ip 4 , .Xr dtrace_kinst 4 , .Xr dtrace_lockstat 4 , +.Xr dtrace_pid 4 , .Xr dtrace_proc 4 , .Xr dtrace_priv 4 , .Xr dtrace_sched 4 , diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile index 131bbd66ca26..87f493120cda 100644 --- a/share/man/man4/Makefile +++ b/share/man/man4/Makefile @@ -947,6 +947,7 @@ _dtrace_provs= dtrace_audit.4 \ dtrace_kinst.4 \ dtrace_lockstat.4 \ dtrace_priv.4 \ + dtrace_pid.4 \ dtrace_proc.4 \ dtrace_sched.4 \ dtrace_sctp.4 \ diff --git a/share/man/man4/dtrace_pid.4 b/share/man/man4/dtrace_pid.4 new file mode 100644 index 000000000000..1acbdd097ba8 --- /dev/null +++ b/share/man/man4/dtrace_pid.4 @@ -0,0 +1,99 @@ +.\" +.\" Copyright (c) 2025 Mateusz Piotrowski <0mp@FreeBSD.org> +.\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" +.Dd November 6, 2025 +.Dt DTRACE_PID 4 +.Os +.Sh NAME +.Nm dtrace_pid +.Nd a DTrace provider for dynamic userspace tracing based on function boundary instrumentation +.Sh SYNOPSIS +.Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:entry +.\" XXX: For some reason Op renders here in bold, so use literal square +.\" brackets instead. +.Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&: Ns No \&[ Ns Ar offset Ns No \&] +.Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:return +.Sh DESCRIPTION +The +.Nm pid +provider implements userspace dynamic tracing +by instrumenting the entry and return of functions in userspace programs. +Refer to +.Xr dtrace_fbt 4 +for more details about function boundary instrumentation. +.Pp +The +.Nm pid +provider provides the following probes: +.Bl -inset +.It Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:entry +instruments the entry of the +.Ar function . +.It Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&: Ns Op Ar offset +instruments the instruction within the +.Ar function +located at +.Ar offset +bytes (expressed as a hexadecimal integer). +.It Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:return +instruments the return from the +.Ar function . +.El +.Ss Probe Arguments +The arguments of the entry probe +.Pq Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:entry +are the arguments of the traced function call. +.Bl -column -offset indent "Entry Probe Argument" "Definition" +.It Sy Entry Probe Argument Ta Sy Definition +.It Ft uint64_t Fa arg0 Ta Function's first argument +.It Ft uint64_t Fa arg1 Ta Function's second argument +.It Ft uint64_t Fa arg2 Ta Function's third argument +.It Fa ... Ta ... +.El +.Pp +The offset probes +.Pq Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&: Ns Op Ar offset +do not define any arguments. +Use +.Va uregs[] +to inspect the registers. +.Pp +The arguments of the return probe +.Pq Nm pid Ns Ar PID Ns Cm \&: Ns Ar module Ns Cm \&: Ns Ar function Ns Cm \&:return +are the program counter and the function's return value. +.Bl -column -offset indent "Return Probe Argument" "Definition" +.It Sy Return Probe Argument Ta Sy Definition +.It Ft uint64_t Fa arg0 Ta Program counter +.It Ft uint64_t Fa arg1 Ta Function's return value +.El +.Pp +Note that all probe arguments within the +.Nm pid +provider are of type +.Ft uint64_t . +.Sh SEE ALSO +.Xr dtrace 1 , +.Xr dtrace_fbt 4 , +.Xr dtrace_kinst 4 , +.Xr elf 5 , +.Xr d 7 , +.Xr tracing 7 +.Rs +.%A Brendan Gregg +.%A Jim Mauro +.%B DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD +.%I Prentice Hall +.%D 2011 +.%U https://www.brendangregg.com/dtracebook/ +.Re +.Rs +.%B The illumos Dynamic Tracing Guide +.%O Chapter pid Provider +.%D 2008 +.%U https://illumos.org/books/dtrace/chp-pid.html +.Re +.Sh AUTHORS +This manual page was written by +.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .