From 5ac1c7ac3466d134ca53cfcb21236f499b7767fd Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Sat, 10 Jun 2017 00:45:07 +0000
Subject: [PATCH] Decode the arguments to ptrace().

This does not decode structures returned by ptrace().
---
 usr.bin/truss/syscall.h  | 1 +
 usr.bin/truss/syscalls.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index ac1e17c50d4..be5da1ece4f 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -50,6 +50,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Ioctl,
 	Kldunloadflags, Sizet, Madvice, Socklent, Sockprotocol, Sockoptlevel,
 	Sockoptname, Msgflags, CapRights, PUInt, PQuadHex, Acltype,
 	Extattrnamespace, Minherit, Mlockall, Mountflags, Msync, Priowhich,
+	Ptraceop,
 
 	CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
 	CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index 979aca61762..6df97c28953 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -361,6 +361,8 @@ static struct syscall decoded_syscalls[] = {
 		    { QuadHex, 3 } } },
 	{ .name = "procctl", .ret_type = 1, .nargs = 4,
 	  .args = { { Idtype, 0 }, { Quad, 1 }, { Procctl, 2 }, { Ptr, 3 } } },
+	{ .name = "ptrace", .ret_type = 1, .nargs = 4,
+	  .args = { { Ptraceop, 0 }, { Int, 1 }, { Ptr, 2 }, { Int, 3 } } },
 	{ .name = "pwrite", .ret_type = 1, .nargs = 4,
 	  .args = { { Int, 0 }, { BinString | IN, 1 }, { Sizet, 2 },
 		    { QuadHex, 3 } } },
@@ -2130,6 +2132,10 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 	case Priowhich:
 		print_integer_arg(sysdecode_prio_which, fp, args[sc->offset]);
 		break;
+	case Ptraceop:
+		print_integer_arg(sysdecode_ptrace_request, fp,
+		    args[sc->offset]);
+		break;
 
 	case CloudABIAdvice:
 		fputs(xlookup(cloudabi_advice, args[sc->offset]), fp);