signal: Document the strange si_codes used by ptrace event stops

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2017-06-26 13:09:03 -05:00 · 2017-06-26 13:09:03 -05:00 · f9886bc50a
parent deaf19c058
commit f9886bc50a
1 changed files with 5 additions and 0 deletions
--- a/include/uapi/asm-generic/siginfo.h
+++ b/include/uapi/asm-generic/siginfo.h
@ -225,6 +225,11 @@ typedef struct siginfo {
 #define TRAP_HWBKPT     4	/* hardware breakpoint/watchpoint */
 #define NSIGTRAP	4

+/*
+ * There are an additional set of SIGTRAP si_codes used by ptrace
+ * that of the form: ((PTRACE_EVENT_XXX << 8) | SIGTRAP)
+ */
+
 /*
 * SIGCHLD si_codes
 */