# HG changeset patch
# User Olaf Wintermann <olaf.wintermann@gmail.com>
# Date 1651999616 -7200
# Node ID 52831b82b3fdf523a2501c03fc5f1431dfb17b95
# Parent  03c052d9a097496e5a1f3e4352b4a307f44ef5a2
add support for O_TRUNC in pg_vfs_open

diff -r 03c052d9a097 -r 52831b82b3fd src/server/plugins/postgresql/vfs.c
--- a/src/server/plugins/postgresql/vfs.c	Sun May 08 10:41:27 2022 +0200
+++ b/src/server/plugins/postgresql/vfs.c	Sun May 08 10:46:56 2022 +0200
@@ -584,6 +584,21 @@
             lo_mode = INV_WRITE;
         }
         fd = lo_open(pg->connection, oid, lo_mode);
+        int err = 0;
+        if(fd < 0) {
+            err = 1;
+        } else if((oflags & O_TRUNC) == O_TRUNC) {
+            if(lo_truncate(pg->connection, fd, 0)) {
+                lo_close(pg->connection, fd);
+                err = 1;
+            }
+        }
+        
+        if(err) {
+            pool_free(ctx->pool, file);
+            pool_free(ctx->pool, pgfile);
+            return NULL;
+        }
     }
     
     pgfile->iscollection = iscollection;