PTRACE_GETSIGMASK and PTRACE_SETSIGMASK were added in linux v3.11
and used by checkpoint/restore tools
#define PTRACE_INTERRUPT 0x4207
#define PTRACE_LISTEN 0x4208
#define PTRACE_PEEKSIGINFO 0x4209
#define PTRACE_INTERRUPT 0x4207
#define PTRACE_LISTEN 0x4208
#define PTRACE_PEEKSIGINFO 0x4209
+#define PTRACE_GETSIGMASK 0x420a
+#define PTRACE_SETSIGMASK 0x420b
#define PT_READ_I PTRACE_PEEKTEXT
#define PT_READ_D PTRACE_PEEKDATA
#define PT_READ_I PTRACE_PEEKTEXT
#define PT_READ_D PTRACE_PEEKDATA