Hello all,
when pg_ctl start is used to run PostgreSQL in a console window on
Windows, it runs in the background (it is terminated by closing the
window, but that is probably inevitable). There is one problem, however:
The first Ctrl-C in that window, no matter in which situation, will
cause the background postmaster to exit. If you, say, ping something,
and press Ctrl-C to stop ping, you probably don't want the database to
go away, too.
Advertising
The reason is that Windows delivers the Ctrl-C event to all processes
using that console, not just to the foreground one.
Here's a patch to fix that. "pg_ctl stop" still works, and it has no
effect when running as a service, so it should be safe. It starts the
postmaster in a new process group (similar to calling setpgrp() after
fork()) that does not receive Ctrl-C events from the console window.
--
Christian
diff --git a/src/bin/pg_ctl/pg_ctl.c b/src/bin/pg_ctl/pg_ctl.c
new file mode 100644
index 50d4586..89a9544
*** a/src/bin/pg_ctl/pg_ctl.c
--- b/src/bin/pg_ctl/pg_ctl.c
*************** CreateRestrictedProcess(char *cmd, PROCE
*** 1561,1566 ****
--- 1561,1567 ----
HANDLE restrictedToken;
SID_IDENTIFIER_AUTHORITY NtAuthority = {SECURITY_NT_AUTHORITY};
SID_AND_ATTRIBUTES dropSids[2];
+ DWORD flags;
/* Functions loaded dynamically */
__CreateRestrictedToken _CreateRestrictedToken = NULL;
*************** CreateRestrictedProcess(char *cmd, PROCE
*** 1636,1642 ****
AddUserToTokenDacl(restrictedToken);
#endif
! r = CreateProcessAsUser(restrictedToken, NULL, cmd, NULL, NULL, TRUE,
CREATE_SUSPENDED, NULL, NULL, &si, processInfo);
Kernel32Handle = LoadLibrary("KERNEL32.DLL");
if (Kernel32Handle != NULL)
--- 1637,1650 ----
AddUserToTokenDacl(restrictedToken);
#endif
! flags = CREATE_SUSPENDED;
!
! /* Protect console process from Ctrl-C */
! if (!as_service) {
! flags |= CREATE_NEW_PROCESS_GROUP;
! }
!
! r = CreateProcessAsUser(restrictedToken, NULL, cmd, NULL, NULL, TRUE,
flags, NULL, NULL, &si, processInfo);
Kernel32Handle = LoadLibrary("KERNEL32.DLL");
if (Kernel32Handle != NULL)
--
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