* fileutils/dd.c (dd_main): Ignore ftruncate error if the output is not a

  file or directory.

1 files changed, 8 insertions, 2 deletions

diff --git a/coreutils/dd.c b/coreutils/dd.c
index 818ab777e..09e6cccc7 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -22,6 +22,7 @@
  */
 
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -106,8 +107,13 @@ int dd_main(int argc, char **argv)
                         perror_msg_and_die("%s", outfile);
 
                 if (seek && trunc) {
-                        if (ftruncate(ofd, seek * bs) < 0)
-                                perror_msg_and_die("%s", outfile);
+                        if (ftruncate(ofd, seek * bs) < 0) {
+                                struct stat st;
+
+                                if (fstat (ofd, &st) < 0 || S_ISREG (st.st_mode) ||
+                                                S_ISDIR (st.st_mode))
+                                        perror_msg_and_die("%s", outfile);
+                        }
                 }
         } else {
                 ofd = STDOUT_FILENO;