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Note that not all optional ptrace events use SIGTRAP.

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New child processes attached due to PTRACE_FORK use SIGSTOP instead of
SIGTRAP.  All other ptrace events use SIGTRAP.
This commit is contained in:
John Baldwin 2016-07-28 20:51:29 +00:00
parent 0e3b891988
commit 57fe078650
1 changed files with 12 additions and 2 deletions
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14
lib/libc/sys/ptrace.2
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@ -2,7 +2,7 @@
.\" $NetBSD: ptrace.2,v 1.2 1995/02/27 12:35:37 cgd Exp $
.\"
.\" This file is in the public domain.
.Dd July 18, 2016
.Dd July 28, 2016
.Dt PTRACE 2
.Os
.Sh NAME
@ -74,11 +74,15 @@ A traced process may report additional signal stops corresponding to
events in the traced process.
These additional signal stops are reported as
.Dv SIGTRAP
or
.Dv SIGSTOP
signals.
The tracing process can use the
.Dv PT_LWPINFO
request to determine which events are associated with a
.Dv SIGTRAP
or
.Dv SIGSTOP
signal.
Note that multiple events may be associated with a single signal.
For example, events indicated by the
@ -88,10 +92,16 @@ and
.Dv PL_FLAG_EXEC
flags are also reported as a system call exit event
.Pq Dv PL_FLAG_SCX .
The signal stop for a new child process enabled via
.Dv PTRACE_FORK
will report a
.Dv SIGSTOP
signal.
All other additional signal stops use
.Dv SIGTRAP .
.Pp
Each traced process has a tracing event mask.
An event in the traced process only reports a
.Dv SIGTRAP
signal stop if the corresponding flag is set in the tracing event mask.
The current set of tracing event flags include:
.Bl -tag -width ".Dv PTRACE_SYSCALL"