From dd92181f600d3456592cb97c87c76cea38d03569 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Sat, 18 Mar 2017 18:26:56 +0000
Subject: [PATCH] Decode flock() operation.

---
 usr.bin/truss/syscall.h  | 2 +-
 usr.bin/truss/syscalls.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/usr.bin/truss/syscall.h b/usr.bin/truss/syscall.h
index 878e85f7fc6a..675256f24d35 100644
--- a/usr.bin/truss/syscall.h
+++ b/usr.bin/truss/syscall.h
@@ -45,7 +45,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Ioctl,
 	Pathconf, Rforkflags, ExitStatus, Waitoptions, Idtype, Procctl,
 	LinuxSockArgs, Umtxop, Atfd, Atflags, Timespec2, Accessmode, Long,
 	Sysarch, ExecArgs, ExecEnv, PipeFds, QuadHex, Utrace, IntArray, Pipe2,
-	CapFcntlRights, Fadvice, FileFlags,
+	CapFcntlRights, Fadvice, FileFlags, Flockop,
 
 	CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
 	CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
diff --git a/usr.bin/truss/syscalls.c b/usr.bin/truss/syscalls.c
index 7207ba68f6f6..eb5a7546122f 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -141,6 +141,8 @@ static struct syscall decoded_syscalls[] = {
 		    { Atflags, 4 } } },
 	{ .name = "fcntl", .ret_type = 1, .nargs = 3,
 	  .args = { { Int, 0 }, { Fcntl, 1 }, { Fcntlflag, 2 } } },
+	{ .name = "flock", .ret_type = 1, .nargs = 2,
+	  .args = { { Int, 0 }, { Flockop, 1 } } },
 	{ .name = "fstat", .ret_type = 1, .nargs = 2,
 	  .args = { { Int, 0 }, { Stat | OUT, 1 } } },
 	{ .name = "fstatat", .ret_type = 1, .nargs = 4,
@@ -1882,6 +1884,9 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
 			fprintf(fp, "|0x%x", rem);
 		break;
 	}
+	case Flockop:
+		print_mask_arg(sysdecode_flock_operation, fp, args[sc->offset]);
+		break;
 
 	case CloudABIAdvice:
 		fputs(xlookup(cloudabi_advice, args[sc->offset]), fp);