Send paramHandle to subprocesses as 64-bit on Win64

The handle to the shared memory segment containing startup
parameters was sent as 32-bit even on 64-bit systems. Since
HANDLEs appear to be allocated sequentially this shouldn't
be a problem until we reach 2^32 open handles in the postmaster,
but a 64-bit value should be sent across as 64-bit, and not
zero out the top 32 bits.

Noted by Tom Lane.

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 25500d4..65278b5 100644 (file)
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -3755,7 +3755,11 @@ internal_forkexec(int argc, char *argv[], Port *port)
        }
 
        /* Insert temp file name after --fork argument */
+#ifdef _WIN64
+       sprintf(paramHandleStr, "%llu", (LONG_PTR) paramHandle);
+#else
        sprintf(paramHandleStr, "%lu", (DWORD) paramHandle);
+#endif
        argv[2] = paramHandleStr;
 
        /* Format the cmd line */
@@ -4825,7 +4829,11 @@ read_backend_variables(char *id, Port *port)
        HANDLE          paramHandle;
        BackendParameters *paramp;
 
+#ifdef _WIN64
+       paramHandle = (HANDLE) _atoi64(id);
+#else
        paramHandle = (HANDLE) atol(id);
+#endif
        paramp = MapViewOfFile(paramHandle, FILE_MAP_READ, 0, 0, 0);
        if (!paramp)
        {