Running lo_read/lo_write under different memory context

cause troubles. See
Message-Id: <199905090312.MAA00466@ext16.sra.co.jp>
for more details.

diff --git a/src/backend/libpq/be-fsstubs.c b/src/backend/libpq/be-fsstubs.c
index 2ac4db633099a920c5fd359a1c9c2c89583d22ee..dec9c7ad6a650555667b047826347d3fed5b352b 100644 (file)
--- a/src/backend/libpq/be-fsstubs.c
+++ b/src/backend/libpq/be-fsstubs.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.30 1999/05/09 00:54:30 tgl Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/libpq/be-fsstubs.c,v 1.31 1999/05/09 15:00:18 ishii Exp $
  *
  * NOTES
  *       This should be moved to a more appropriate place.  It is here
@@ -131,6 +131,9 @@ lo_close(int fd)
 int
 lo_read(int fd, char *buf, int len)
 {
+       MemoryContext currentContext;
+       int status;
+
        if (fd < 0 || fd >= MAX_LOBJ_FDS)
        {
                elog(ERROR, "lo_read: large obj descriptor (%d) out of range", fd);
@@ -141,13 +144,20 @@ lo_read(int fd, char *buf, int len)
                elog(ERROR, "lo_read: invalid large obj descriptor (%d)", fd);
                return -3;
        }
+       currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
+
+       status = inv_read(cookies[fd], buf, len);
 
-       return inv_read(cookies[fd], buf, len);
+       MemoryContextSwitchTo(currentContext);
+       return(status);
 }
 
 int
 lo_write(int fd, char *buf, int len)
 {
+       MemoryContext currentContext;
+       int status;
+
        if (fd < 0 || fd >= MAX_LOBJ_FDS)
        {
                elog(ERROR, "lo_write: large obj descriptor (%d) out of range", fd);
@@ -158,8 +168,12 @@ lo_write(int fd, char *buf, int len)
                elog(ERROR, "lo_write: invalid large obj descriptor (%d)", fd);
                return -3;
        }
+       currentContext = MemoryContextSwitchTo((MemoryContext) fscxt);
+
+       status = inv_write(cookies[fd], buf, len);
 
-       return inv_write(cookies[fd], buf, len);
+       MemoryContextSwitchTo(currentContext);
+       return(status);
 }