for the calling process upon delivery of a signal whose default behavior is
to produce a core dump.
-Normally, this flag is set for a process by default, but it is cleared
-when a set-user-ID or set-group-ID program,
-or a program that has file capabilities associated with it (see
-.BR capabilities (7)),
-is executed.
-It is also set by various system calls that manipulate process UIDs and GIDs.
-
In kernels up to and including 2.6.12,
.I arg2
must be either 0
in
.BR proc (5).)
+Normally, this flag is set for a process by default, but it is cleared
+when a set-user-ID or set-group-ID program,
+or a program that has file capabilities associated with it (see
+.BR capabilities (7)),
+is executed.
+It is also set by various system calls that manipulate process UIDs and GIDs.
+
Processes that are not dumpable can not be attached via
.BR ptrace (2)
.BR PTRACE_ATTACH .