Index: lib/sanitizer_common/sanitizer_common_interceptors.inc
===================================================================
--- lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -77,6 +77,11 @@
 #define ctime __ctime50
 #define ctime_r __ctime_r50
 #define devname __devname50
+#define fts_children __fts_children60
+#define fts_close __fts_close60
+#define fts_open __fts_open60
+#define fts_read __fts_read60
+#define fts_set __fts_set60
 #define getitimer __getitimer50
 #define getpwent __getpwent50
 #define getpwnam __getpwnam50
@@ -7252,6 +7257,74 @@
 #define INIT_NETENT
 #endif
 
+#if SANITIZER_INTERCEPT_FTS
+INTERCEPTOR(void *, fts_open, char *const *path_argv, int options,
+            int (*compar)(void **, void **)) {
+  void *ctx;
+  void *fts;
+  COMMON_INTERCEPTOR_ENTER(ctx, fts_open, path_argv, options, compar);
+  if (path_argv) {
+    char *const *pa = path_argv;
+    while (*pa) {
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, pa, sizeof(char **));
+      COMMON_INTERCEPTOR_READ_RANGE(ctx, *pa, REAL(strlen)(*pa) + 1);
+      pa++;
+    }
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, pa, sizeof(char **));
+  }
+  // TODO: handle compar callback
+  fts = REAL(fts_open)(path_argv, options, compar);
+  if (fts)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, fts, struct_FTS_sz);
+  return fts;
+}
+
+INTERCEPTOR(void *, fts_read, void *ftsp) {
+  void *ctx;
+  void *ftsent;
+  COMMON_INTERCEPTOR_ENTER(ctx, fts_read, ftsp);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, ftsp, struct_FTS_sz);
+  ftsent = REAL(fts_read)(ftsp);
+  if (ftsent)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ftsent, struct_FTSENT_sz);
+  return ftsent;
+}
+
+INTERCEPTOR(void *, fts_children, void *ftsp, int options) {
+  void *ctx;
+  void *ftsent;
+  COMMON_INTERCEPTOR_ENTER(ctx, fts_children, ftsp, options);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, ftsp, struct_FTS_sz);
+  ftsent = REAL(fts_children)(ftsp, options);
+  if (ftsent)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ftsent, struct_FTSENT_sz);
+  return ftsent;
+}
+
+INTERCEPTOR(int, fts_set, void *ftsp, void *f, int options) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, fts_set, ftsp, f, options);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, ftsp, struct_FTS_sz);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, f, struct_FTSENT_sz);
+  return REAL(fts_set)(ftsp, f, options);
+}
+
+INTERCEPTOR(int, fts_close, void *ftsp) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, fts_close, ftsp);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, ftsp, struct_FTS_sz);
+  return REAL(fts_close)(ftsp);
+}
+#define INIT_FTS                                                               \
+  COMMON_INTERCEPT_FUNCTION(fts_open);                                         \
+  COMMON_INTERCEPT_FUNCTION(fts_read);                                         \
+  COMMON_INTERCEPT_FUNCTION(fts_children);                                     \
+  COMMON_INTERCEPT_FUNCTION(fts_set);                                          \
+  COMMON_INTERCEPT_FUNCTION(fts_close);
+#else
+#define INIT_FTS
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
@@ -7503,6 +7576,7 @@
   INIT_TTYENT;
   INIT_PROTOENT;
   INIT_NETENT;
+  INIT_FTS;
 
   INIT___PRINTF_CHK;
 }
Index: lib/sanitizer_common/sanitizer_platform_interceptors.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -514,5 +514,6 @@
 #define SANITIZER_INTERCEPT_TTYENT SI_NETBSD
 #define SANITIZER_INTERCEPT_PROTOENT SI_NETBSD
 #define SANITIZER_INTERCEPT_NETENT SI_NETBSD
+#define SANITIZER_INTERCEPT_FTS SI_NETBSD
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H
Index: lib/sanitizer_common/sanitizer_platform_limits_netbsd.h
===================================================================
--- lib/sanitizer_common/sanitizer_platform_limits_netbsd.h
+++ lib/sanitizer_common/sanitizer_platform_limits_netbsd.h
@@ -60,6 +60,8 @@
 extern unsigned struct_sembuf_sz;
 
 extern unsigned struct_kevent_sz;
+extern unsigned struct_FTS_sz;
+extern unsigned struct_FTSENT_sz;
 
 union __sanitizer_sigval {
   int sival_int;
Index: lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
===================================================================
--- lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
+++ lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
@@ -253,6 +253,8 @@
 unsigned struct_timespec_sz = sizeof(struct timespec);
 unsigned struct_sembuf_sz = sizeof(struct sembuf);
 unsigned struct_kevent_sz = sizeof(struct kevent);
+unsigned struct_FTS_sz = sizeof(FTS);
+unsigned struct_FTSENT_sz = sizeof(FTSENT);
 unsigned struct_utimbuf_sz = sizeof(struct utimbuf);
 unsigned struct_itimerspec_sz = sizeof(struct itimerspec);
 unsigned struct_timex_sz = sizeof(struct timex);
Index: test/sanitizer_common/TestCases/NetBSD/fts.cc
===================================================================
--- /dev/null
+++ test/sanitizer_common/TestCases/NetBSD/fts.cc
@@ -0,0 +1,44 @@
+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include <sys/stat.h>
+
+#include <err.h>
+#include <fts.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+  FTS *ftsp;
+  FTSENT *p, *chp;
+  size_t n = 0;
+  char *const paths[] = { (char *)"/etc", 0 };
+
+  ftsp = fts_open(paths, FTS_LOGICAL, NULL);
+  if (ftsp == NULL)
+    errx(EXIT_FAILURE, "fts_open");
+
+  chp = fts_children(ftsp, 0);
+  if (chp == NULL)
+    errx(EXIT_FAILURE, "fts_children: no files to traverse");
+
+  while ((p = fts_read(ftsp)) != NULL) {
+    /* Skip recursively subdirectories */
+    if (p->fts_info == FTS_D && p->fts_level != FTS_ROOTLEVEL) /* pre-order */
+      fts_set(ftsp, p, FTS_SKIP);
+    else if (p->fts_info == FTS_DP) /* post-order */
+      continue;
+    else if (p->fts_info == FTS_F) /* regular file */
+      n++;
+  }
+
+  fts_close(ftsp);
+
+  printf("Number of files in /etc: '%zu'\n", n);
+
+  return EXIT_SUCCESS;
+
+  // CHECK: Number of files in /etc: '{{.*}}'
+}