libc/syscalls: Add mkdir stub

googletest fails to link without mkdir. This commit adds a stub that
always returns an error.

BRANCH=none
BUG=b:254530679
TEST=make buildall

Signed-off-by: Tom Hughes <tomhughes@chromium.org>
Change-Id: I1a587cfbb950193cf99e7d98d28f1d20555ec9ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4076809
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Reviewed-by: Andrea Grandi <agrandi@google.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/libc/syscalls.c b/libc/syscalls.c
index 43955a0ddd..16cac352d3 100644
--- a/libc/syscalls.c
+++ b/libc/syscalls.c
@@ -16,6 +16,10 @@
 #include "task.h"
 #include "uart.h"
 
+#include <errno.h>
+
+#include <sys/stat.h>
+
 /**
  * Reboot the system.
  *
@@ -43,3 +47,22 @@ int _write(int fd, char *buf, int len)
 {
 	return uart_put(buf, len);
 }
+
+/**
+ * Create a directory.
+ *
+ * @warning Not implemented.
+ *
+ * @note Unlike the other functions in this file, this is not overriding a
+ * stub version in libnosys. There's no "_mkdir" stub in libnosys, so this
+ * provides the actual "mkdir" function.
+ *
+ * @param pathname directory to create
+ * @param mode mode for the new directory
+ * @return -1 (error) always
+ */
+int mkdir(const char *pathname, mode_t mode)
+{
+	errno = ENOSYS;
+	return -1;
+}