X-Git-Url: https://ruderich.org/simon/gitweb/?p=coloredstderr%2Fcoloredstderr.git;a=blobdiff_plain;f=src%2Fcoloredstderr.c;h=b2ef2975ef8d6e5ffae8625e925ae5caf46e3523;hp=dbcfd235cf649a7a412b6f1ca6f896c1bbf71c71;hb=f369605227fb876e2edb0957a7c6ace98c49f7d3;hpb=6d15f6c9902c1ac879ce0dee201ff8c6c66afaf1

diff --git a/src/coloredstderr.c b/src/coloredstderr.c
index dbcfd23..b2ef297 100644
--- a/src/coloredstderr.c
+++ b/src/coloredstderr.c
@@ -280,7 +280,7 @@ int fcntl(int fd, int cmd, int arg) {
 
     result = real_fcntl(fd, cmd, arg);
     /* We only care about duping fds. */
-    if (cmd == F_DUPFD) {
+    if (cmd == F_DUPFD && result != -1) {
         int saved_errno = errno;
         dup_fd(fd, result);
         errno = saved_errno;