3 files changed, 30 insertions, 8 deletions
diff --git a/lib/libc/gen/fdopendir.c b/lib/libc/gen/fdopendir.c
index df6709fbcb85..9393cbe28f85 100644
--- a/lib/libc/gen/fdopendir.c
+++ b/lib/libc/gen/fdopendir.c
@@ -48,8 +48,16 @@
 DIR *
 fdopendir(int fd)
 {
+	int flags, rc;
 
-	if (_fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+	flags = _fcntl(fd, F_GETFD, 0);
+	if (flags == -1)
 		return (NULL);
+
+	if ((flags & FD_CLOEXEC) == 0) {
+		rc = _fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
+		if (rc == -1)
+			return (NULL);
+	}
 	return (__opendir_common(fd, DTF_HIDEW | DTF_NODUP, true));
 }
diff --git a/lib/libc/stdio/fdopen.c b/lib/libc/stdio/fdopen.c
index a0d7b71df782..49ec97eda39d 100644
--- a/lib/libc/stdio/fdopen.c
+++ b/lib/libc/stdio/fdopen.c
@@ -46,7 +46,7 @@ FILE *
 fdopen(int fd, const char *mode)
 {
 	FILE *fp;
-	int flags, oflags, fdflags, tmp;
+	int flags, oflags, fdflags, rc, tmp;
 
 	/*
 	 * File descriptors are a full int, but _file is only a short.
@@ -76,9 +76,19 @@ fdopen(int fd, const char *mode)
 	if ((fp = __sfp()) == NULL)
 		return (NULL);
 
-	if ((oflags & O_CLOEXEC) && _fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
-		fp->_flags = 0;
-		return (NULL);
+	if ((oflags & O_CLOEXEC) != 0) {
+		tmp = _fcntl(fd, F_GETFD, 0);
+		if (tmp == -1) {
+			fp->_flags = 0;
+			return (NULL);
+		}
+		if ((tmp & FD_CLOEXEC) == 0) {
+			rc = _fcntl(fd, F_SETFD, tmp | FD_CLOEXEC);
+			if (rc == -1) {
+				fp->_flags = 0;
+				return (NULL);
+			}
+		}
 	}
 
 	fp->_flags = flags;
diff --git a/lib/libc/stdio/freopen.c b/lib/libc/stdio/freopen.c
index f0732b6d6741..048fd30b3193 100644
--- a/lib/libc/stdio/freopen.c
+++ b/lib/libc/stdio/freopen.c
@@ -55,7 +55,7 @@ freopen(const char * __restrict file, const char * __restrict mode,
     FILE * __restrict fp)
 {
 	int f;
-	int dflags, flags, isopen, oflags, sverrno, wantfd;
+	int dflags, fdflags, flags, isopen, oflags, sverrno, wantfd;
 
 	if ((flags = __sflags(mode, &oflags)) == 0) {
 		sverrno = errno;
@@ -113,8 +113,12 @@ freopen(const char * __restrict file, const char * __restrict mode,
 			(void) ftruncate(fp->_file, (off_t)0);
 		if (!(oflags & O_APPEND))
 			(void) _sseek(fp, (fpos_t)0, SEEK_SET);
-		if (oflags & O_CLOEXEC)
-			(void) _fcntl(fp->_file, F_SETFD, FD_CLOEXEC);
+		if ((oflags & O_CLOEXEC) != 0) {
+			fdflags = _fcntl(fp->_file, F_GETFD, 0);
+			if (fdflags != -1 && (fdflags & FD_CLOEXEC) == 0)
+				(void) _fcntl(fp->_file, F_SETFD,
+				    fdflags | FD_CLOEXEC);
+		}
 		f = fp->_file;
 		isopen = 0;
 		wantfd = -1;