* [PATCH] ptrace.2: if SEIZE was used, initial auto-attach stop is EVENT_STOP
@ 2013-07-02 10:51 Denys Vlasenko
[not found] ` <1372762277-31981-1-git-send-email-dvlasenk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Denys Vlasenko @ 2013-07-02 10:51 UTC (permalink / raw)
To: Michael Kerrisk
Cc: Denys Vlasenko, linux-man-u79uwXL29TY76Z2rM5mHXA, Oleg Nesterov,
Jan Kratochvil, Dmitry V. Levin
For every PTRACE_O_TRACEfoo option, mention that old-style SIGSTOP
is replaced by PTRACE_EVENT_STOP if PTRACE_SEIZE attach was used.
Mention the same thing again in the description of PTRACE_EVENT_STOP.
Signed-off-by: Denys Vlasenko <dvlasenk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
CC: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
CC: Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
CC: Jan Kratochvil <jan.kratochvil-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
CC: Dmitry V. Levin <ldv-u2l5PoMzF/Vg9hUCZPvPmw@public.gmane.org>
---
man2/ptrace.2 | 32 ++++++++++++++++++++++++++++----
1 file changed, 28 insertions(+), 4 deletions(-)
diff --git a/man2/ptrace.2 b/man2/ptrace.2
index 79d14cc..55c4fe2 100644
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -340,7 +340,12 @@ Stop the tracee at the next
.BR clone (2)
and automatically start tracing the newly cloned process,
which will start with a
-.BR SIGSTOP .
+.BR SIGSTOP ,
+or
+.B PTRACE_EVENT_STOP
+if
+.B PTRACE_SEIZE
+was used.
A
.BR waitpid (2)
by the tracer will return a
@@ -421,7 +426,12 @@ Stop the tracee at the next
.BR fork (2)
and automatically start tracing the newly forked process,
which will start with a
-.BR SIGSTOP .
+.BR SIGSTOP ,
+or
+.B PTRACE_EVENT_STOP
+if
+.B PTRACE_SEIZE
+was used.
A
.BR waitpid (2)
by the tracer will return a
@@ -449,7 +459,12 @@ Stop the tracee at the next
.BR vfork (2)
and automatically start tracing the newly vforked process,
which will start with a
-.BR SIGSTOP .
+.BR SIGSTOP ,
+or
+.B PTRACE_EVENT_STOP
+if
+.B PTRACE_SEIZE
+was used.
A
.BR waitpid (2)
by the tracer will return a
@@ -1208,7 +1223,16 @@ to finish exiting.
.B PTRACE_EVENT_STOP
Stop induced by
.B PTRACE_INTERRUPT
-command, or group-stop (only if attached using PTRACE_SEIZE).
+command, group-stop, or initial ptrace-stop when a new child is attached
+(only if attached using
+.BR PTRACE_SEIZE ).
+Note that unlike other
+.B PTRACE_EVENT
+stops, this stop has
+.I WSTOPSIG(status)
+other than
+.B SIGTRAP
+if it reports a group-stop.
.LP
.B PTRACE_GETSIGINFO
on
--
1.8.1.4
--
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2013-07-02 10:51 [PATCH] ptrace.2: if SEIZE was used, initial auto-attach stop is EVENT_STOP Denys Vlasenko
[not found] ` <1372762277-31981-1-git-send-email-dvlasenk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-07-10 18:50 ` Michael Kerrisk
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