ptrace.2: Note that PTRACE_ATTACH cannot be applied to nondumpable processes

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man2/ptrace.2 b/man2/ptrace.2
index 5cb426ab880319fca54cdcfacb096536ebfdaaf9..db66ec3f8896ca8ea3854e0a1d328e4e0540bffc 100644 (file)
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -788,6 +788,14 @@ See the "Attaching and detaching" subsection for additional information.
 and
 .I data
 are ignored.)
+
+Processes that are not dumpable (see the description of
+.BR PR_SET_DUMPABLE
+in
+.BR prctl (2))
+can  not  be  attached  via
+.BR ptrace (2)
+.BR PTRACE_ATTACH .
 .TP
 .BR PTRACE_SEIZE " (since Linux 3.4)"
 Attach to the process specified in