1 files changed, 51 insertions, 0 deletions
diff --git a/usr/kinit/xpio.c b/usr/kinit/xpio.c
new file mode 100644
index 0000000..42a9844
--- /dev/null
+++ b/usr/kinit/xpio.c
@@ -0,0 +1,51 @@
+/*
+ * Looping versions of pread() and pwrite()
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "xpio.h"
+
+ssize_t xpread(int fd, void *buf, size_t count, off_t offset)
+{
+	ssize_t ctr = 0;
+	ssize_t rv = 0;
+	char *bp = buf;
+
+	while (count) {
+		rv = pread(fd, bp, count, offset);
+
+		if (rv == 0 || (rv == -1 && errno != EINTR))
+			break;
+
+		bp	+= rv;
+		count	-= rv;
+		offset	+= rv;
+		ctr	+= rv;
+	}
+
+	return ctr ? ctr : rv;
+}
+
+ssize_t xpwrite(int fd, void *buf, size_t count, off_t offset)
+{
+	ssize_t ctr = 0;
+	ssize_t rv = 0;
+	char *bp = buf;
+
+	while (count) {
+		rv = pwrite(fd, bp, count, offset);
+
+		if (rv == 0 || (rv == -1 && errno != EINTR))
+			break;
+
+		bp	+= rv;
+		count	-= rv;
+		offset	+= rv;
+		ctr	+= rv;
+	}
+
+	return ctr ? ctr : rv;
+}