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Ensure that 'errno' is saved and restored by all signal handlers that

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might change it.  Experimentation shows that the signal handler call
mechanism does not save/restore errno for you, at least not on Linux
or HPUX, so this is definitely a real risk.
This commit is contained in:
Tom Lane
2000-12-18 17:33:42 +00:00
parent c431db9714
commit 5491233f52
6 changed files with 79 additions and 16 deletions
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5
src/backend/commands/async.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.73 2000/11/28 23:27:54 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/async.c,v 1.74 2000/12/18 17:33:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -589,6 +589,7 @@ AtAbort_Notify()
void
Async_NotifyHandler(SIGNAL_ARGS)
{
int save_errno = errno;
/*
* Note: this is a SIGNAL HANDLER. You must be very wary what you do
@@ -637,6 +638,8 @@ Async_NotifyHandler(SIGNAL_ARGS)
*/
notifyInterruptOccurred = 1;
}
errno = save_errno;
}
/*