1 files changed, 15 insertions, 0 deletions
diff --git a/src/stdio/__stdio_seek.c b/src/stdio/__stdio_seek.c
new file mode 100644
index 00000000..fdb9fe7f
--- /dev/null
+++ b/src/stdio/__stdio_seek.c
@@ -0,0 +1,15 @@
+#include "stdio_impl.h"
+
+static off_t retneg1(FILE *f, off_t off, int whence)
+{
+	return -1;
+}
+
+off_t __stdio_seek(FILE *f, off_t off, int whence)
+{
+	off_t ret = __syscall_lseek(f->fd, off, whence);
+	/* Detect unseekable files and optimize future failures out */
+	if (ret < 0 && off == 0 && whence == SEEK_CUR)
+		f->seek = retneg1;
+	return ret;
+}