[PATCH v3 2/3] tools/nolibc: Add dirfd()

[Daniel Palmer <daniel@thingy.jp>]

This is useful for things like fstatat() on children of a directory
opened with opendir().

Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 tools/include/nolibc/dirent.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/include/nolibc/dirent.h b/tools/include/nolibc/dirent.h
index 7666dc69506f..76331ed65560 100644
--- a/tools/include/nolibc/dirent.h
+++ b/tools/include/nolibc/dirent.h
@@ -74,6 +74,19 @@ DIR *opendir(const char *name)
 	return (DIR *)(intptr_t)~fd;
 }
 
+static __attribute__((unused))
+int dirfd(DIR *dirp)
+{
+	int fd = __nolibc_dirfd(dirp);
+
+	if (fd < 0) {
+		SET_ERRNO(EINVAL);
+		return -1;
+	}
+
+	return fd;
+}
+
 static __attribute__((unused))
 int closedir(DIR *dirp)
 {
-- 
2.53.0