Adding upstream version 16.2.upstream/16.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/port/pwritev.c b/src/port/pwritev.c
new file mode 100644
index 0000000..519de45
--- /dev/null
+++ b/src/port/pwritev.c
@@ -0,0 +1,43 @@
+/*-------------------------------------------------------------------------
+ *
+ * pwritev.c
+ *	  Implementation of pwritev(2) for platforms that lack one.
+ *
+ * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	  src/port/pwritev.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+
+#include "c.h"
+
+#include <unistd.h>
+
+#include "port/pg_iovec.h"
+
+ssize_t
+pg_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
+{
+	ssize_t		sum = 0;
+	ssize_t		part;
+
+	for (int i = 0; i < iovcnt; ++i)
+	{
+		part = pg_pwrite(fd, iov[i].iov_base, iov[i].iov_len, offset);
+		if (part < 0)
+		{
+			if (i == 0)
+				return -1;
+			else
+				return sum;
+		}
+		sum += part;
+		offset += part;
+		if (part < iov[i].iov_len)
+			return sum;
+	}
+	return sum;
+}