signal: Document the strange si_codes used by ptrace event stops

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

signal: Document the strange si_codes used by ptrace event stops
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
f9886bc5 · Eric W. Biederman · deaf19c0 · f9886bc5
Commit f9886bc5 authored Jun 26, 2017 by Eric W. Biederman
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include/uapi/asm-generic/siginfo.h include/uapi/asm-generic/siginfo.h +5 -0

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--- 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
 */