Add a minimal implementation of utimensat().

Some systems (eg older OS X) do not have utimensat, so provide minimal
implementation in compat layer.  Fixes build on at least El Capitan.

1 files changed, 37 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-misc.c b/openbsd-compat/bsd-misc.c
index 5d7540a70..4bae96548 100644
--- a/openbsd-compat/bsd-misc.c
+++ b/openbsd-compat/bsd-misc.c
@@ -25,6 +25,7 @@
 # include <sys/time.h>
 #endif
 
+#include <fcntl.h>
 #include <string.h>
 #include <signal.h>
 #include <stdlib.h>
@@ -117,6 +118,42 @@ int utimes(char *filename, struct timeval *tvp)
 }
 #endif
 
+#ifndef HAVE_UTIMENSAT
+/*
+ * A limited implementation of utimensat() that only implements the
+ * functionality used by OpenSSH, currently only AT_FDCWD and
+ * AT_SYMLINK_NOFOLLOW.
+ */
+int
+utimensat(int fd, const char *path, const struct timespec times[2],
+    int flag)
+{
+        struct timeval tv[2];
+        int ret, oflags = O_WRONLY;
+
+        tv[0].tv_sec = times[0].tv_sec;
+        tv[0].tv_usec = times[0].tv_nsec / 1000;
+        tv[1].tv_sec = times[1].tv_sec;
+        tv[1].tv_usec = times[1].tv_nsec / 1000;
+
+        if (fd != AT_FDCWD) {
+                errno = ENOSYS;
+                return -1;
+        }
+# ifndef HAVE_FUTIMES
+        return utimes(path, tv);
+# else
+        if (flag & AT_SYMLINK_NOFOLLOW)
+                oflags |= O_NOFOLLOW;
+        if ((fd = open(path, oflags)) == -1)
+                return -1;
+        ret = futimes(fd, tv);
+        close(fd);
+        return ret;
+# endif
+}
+#endif
+
 #ifndef HAVE_TRUNCATE
 int truncate(const char *path, off_t length)
 {