6 files changed, 51 insertions, 21 deletions
diff --git a/bfs.h b/bfs.h
index f177340..c8b4255 100644
--- a/bfs.h
+++ b/bfs.h
@@ -27,13 +27,6 @@
 #	define BFS_HOMEPAGE "https://github.com/tavianator/bfs"
 #endif
 
-// Some portability concerns
-#if __APPLE__
-#	define st_atim st_atimespec
-#	define st_ctim st_ctimespec
-#	define st_mtim st_mtimespec
-#endif
-
 /**
  * A command line expression.
  */
diff --git a/bftw.c b/bftw.c
index 6205d79..614b418 100644
--- a/bftw.c
+++ b/bftw.c
@@ -359,10 +359,10 @@ static DIR *dircache_entry_open(struct dircache *cache, struct dircache_entry *e
 	// footprint significantly, while keeping the fd around for future
 	// openat() calls.
 
-	fd = fcntl(entry->fd, F_DUPFD_CLOEXEC, 0);
+	fd = dup_cloexec(entry->fd);
 
 	if (fd < 0 && dircache_should_retry(cache, entry)) {
-		fd = fcntl(entry->fd, F_DUPFD_CLOEXEC, 0);
+		fd = dup_cloexec(entry->fd);
 	}
 	if (fd < 0) {
 		return NULL;
diff --git a/eval.c b/eval.c
index d3b8f19..ebead3b 100644
--- a/eval.c
+++ b/eval.c
@@ -27,18 +27,6 @@
 #include <time.h>
 #include <unistd.h>
 
-#ifndef S_ISDOOR
-#	define S_ISDOOR(mode) false
-#endif
-
-#ifndef S_ISPORT
-#	define S_ISPORT(mode) false
-#endif
-
-#ifndef S_ISWHT
-#	define S_ISWHT(mode) false
-#endif
-
 struct eval_state {
 	/** Data about the current file. */
 	struct BFTW *ftwbuf;
diff --git a/parse.c b/parse.c
index bf3a09a..2a78686 100644
--- a/parse.c
+++ b/parse.c
@@ -11,6 +11,7 @@
 
 #include "bfs.h"
 #include "typo.h"
+#include "util.h"
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/util.c b/util.c
index aef5fbb..bc611a8 100644
--- a/util.c
+++ b/util.c
@@ -58,3 +58,21 @@ int redirect(int fd, const char *path, int flags, ...) {
 
 	return ret;
 }
+
+int dup_cloexec(int fd) {
+#ifdef F_DUPFD_CLOEXEC
+	return fcntl(fd, F_DUPFD_CLOEXEC, 0);
+#else
+	int ret = dup(fd);
+	if (ret < 0) {
+		return -1;
+	}
+
+	if (fcntl(ret, F_SETFD, FD_CLOEXEC) == -1) {
+		close(ret);
+		return -1;
+	}
+
+	return ret;
+#endif
+}
diff --git a/util.h b/util.h
index fbcadbd..e814f23 100644
--- a/util.h
+++ b/util.h
@@ -14,6 +14,27 @@
 
 #include <dirent.h>
 #include <stdbool.h>
+#include <sys/stat.h>
+
+// Some portability concerns
+
+#if __APPLE__
+#	define st_atim st_atimespec
+#	define st_ctim st_ctimespec
+#	define st_mtim st_mtimespec
+#endif
+
+#ifndef S_ISDOOR
+#	define S_ISDOOR(mode) false
+#endif
+
+#ifndef S_ISPORT
+#	define S_ISPORT(mode) false
+#endif
+
+#ifndef S_ISWHT
+#	define S_ISWHT(mode) false
+#endif
 
 /**
  * readdir() wrapper that makes error handling cleaner.
@@ -40,4 +61,13 @@ bool isopen(int fd);
  */
 int redirect(int fd, const char *path, int flags, ...);
 
+/**
+ * Like dup(), but set the FD_CLOEXEC flag.
+ *
+ * @param fd
+ *         The file descriptor to duplicate.
+ * @return A duplicated file descriptor, or -1 on failure.
+ */
+int dup_cloexec(int fd);
+
 #endif // BFS_UTIL_H