From ecac235bb0253f5a08371f565eac9468946c973b Mon Sep 17 00:00:00 2001
From: Michael Tuexen <tuexen@FreeBSD.org>
Date: Wed, 3 May 2017 09:23:13 +0000
Subject: [PATCH] Decode the third argument of socket().

---
 usr.bin/truss/syscall.h  |  2 +-
 usr.bin/truss/syscalls.c | 13 ++++++++++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index e703d434f315..e4c3beeb292e 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -46,7 +46,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Ioctl,
 	LinuxSockArgs, Umtxop, Atfd, Atflags, Timespec2, Accessmode, Long,
 	Sysarch, ExecArgs, ExecEnv, PipeFds, QuadHex, Utrace, IntArray, Pipe2,
 	CapFcntlRights, Fadvice, FileFlags, Flockop, Getfsstatmode, Kldsymcmd,
-	Kldunloadflags, Sizet, Madvice, Socklent,
+	Kldunloadflags, Sizet, Madvice, Socklent, Sockprotocol,
 
 	CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
 	CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index 1254f3b25214..61554115824f 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -317,7 +317,7 @@ static struct syscall decoded_syscalls[] = {
 	{ .name = "sigwaitinfo", .ret_type = 1, .nargs = 2,
 	  .args = { { Sigset | IN, 0 }, { Ptr, 1 } } },
 	{ .name = "socket", .ret_type = 1, .nargs = 3,
-	  .args = { { Sockdomain, 0 }, { Socktype, 1 }, { Int, 2 } } },
+	  .args = { { Sockdomain, 0 }, { Socktype, 1 }, { Sockprotocol, 2 } } },
 	{ .name = "stat", .ret_type = 1, .nargs = 2,
 	  .args = { { Name | IN, 0 }, { Stat | OUT, 1 } } },
 	{ .name = "statfs", .ret_type = 1, .nargs = 2,
@@ -1917,6 +1917,17 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 	case Socklent:
 		fprintf(fp, "%u", (socklen_t)args[sc->offset]);
 		break;
+	case Sockprotocol: {
+		int protocol;
+
+		protocol = args[sc->offset];
+		if (protocol == 0) {
+			fputs("0", fp);
+		} else {
+			print_integer_arg(sysdecode_ipproto, fp, protocol);
+		}
+		break;
+	}
 
 	case CloudABIAdvice:
 		fputs(xlookup(cloudabi_advice, args[sc->offset]), fp);