diff --git a/src/backend/access/heap/rewriteheap.c b/src/backend/access/heap/rewriteheap.c
index 871d9e43d772f87a302ae1b1654c84cf72d2f336..66c4ea0c3e2fb04ed1d59fce51b83fc4aff08835 100644
--- a/src/backend/access/heap/rewriteheap.c
+++ b/src/backend/access/heap/rewriteheap.c
@@ -1172,6 +1172,7 @@ heap_xlog_logical_rewrite(XLogRecPtr lsn, XLogRecord *r)
 	len = xlrec->num_mappings * sizeof(LogicalRewriteMappingData);
 
 	/* write out tail end of mapping file (again) */
+	errno = 0;
 	if (write(fd, data, len) != len)
 	{
 		/* if write didn't set errno, assume problem is no disk space */
diff --git a/src/backend/access/transam/twophase.c b/src/backend/access/transam/twophase.c
index c04baf34039f6c81d480e1d9291a8aae8303aba8..c93ef1d5d235b70c11e874abe735be16f319f14c 100644
--- a/src/backend/access/transam/twophase.c
+++ b/src/backend/access/transam/twophase.c
@@ -1566,6 +1566,7 @@ RecreateTwoPhaseFile(TransactionId xid, void *content, int len)
 						path)));
 
 	/* Write content and CRC */
+	errno = 0;
 	if (write(fd, content, len) != len)
 	{
 		int			save_errno = errno;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 7a8b706f2217fab2192b8292715720cc95bb03e6..94fb5b9deb2a78db322ede32073eb37a06fb74a3 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -2296,6 +2296,7 @@ ReorderBufferSerializeChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
 
 	ondisk->size = sz;
 
+	errno = 0;
 	if (write(fd, rb->outbuf, ondisk->size) != ondisk->size)
 	{
 		int save_errno = errno;
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index 71cc06d46368db37168a45e769206363ae48e5d7..37a3d77a4c907c2b1e324cb8bc1f7a0e80746b98 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -1571,6 +1571,7 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
 		ereport(ERROR,
 				(errmsg("could not open file \"%s\": %m", path)));
 
+	errno = 0;
 	if ((write(fd, ondisk, needed_length)) != needed_length)
 	{
 		int			save_errno = errno;
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index 661415b9a207520b5fc82e0150e65d549921f080..af47cdab0ebe08d5d56ef0924f85586a5bcf91e2 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -1026,6 +1026,7 @@ SaveSlotToPath(ReplicationSlot *slot, const char *dir, int elevel)
 				SnapBuildOnDiskChecksummedSize);
 	FIN_CRC32(cp.checksum);
 
+	errno = 0;
 	if ((write(fd, &cp, sizeof(cp))) != sizeof(cp))
 	{
 		int			save_errno = errno;
diff --git a/src/bin/pg_basebackup/receivelog.c b/src/bin/pg_basebackup/receivelog.c
index da76d9befdad52e6047188f9dc43bbc80d29717d..5e1f3d40496ac4795290f3c546e1b33637efc9d7 100644
--- a/src/bin/pg_basebackup/receivelog.c
+++ b/src/bin/pg_basebackup/receivelog.c
@@ -137,6 +137,7 @@ open_walfile(XLogRecPtr startpoint, uint32 timeline, char *basedir,
 	zerobuf = pg_malloc0(XLOG_BLCKSZ);
 	for (bytes = 0; bytes < XLogSegSize; bytes += XLOG_BLCKSZ)
 	{
+		errno = 0;
 		if (write(f, zerobuf, XLOG_BLCKSZ) != XLOG_BLCKSZ)
 		{
 			/* if write didn't set errno, assume problem is no disk space */
@@ -1094,6 +1095,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,
 					}
 				}
 
+				errno = 0;
 				if (write(walfile,
 						  copybuf + hdr_len + bytes_written,
 						  bytes_to_write) != bytes_to_write)