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(_hurdsig_longjmp_from_handler): Store MACH_PORT_DEAD in the thread reply-port variable before destroying the signal handler's reply port, to avoid infinite recursion.

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This commit is contained in:
Miles Bader 1996-04-10 18:36:02 +00:00
parent b84095feb4
commit 574ce5e4e4
1 changed files with 10 additions and 2 deletions
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12
hurd/sigunwind.c
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@ -1,5 +1,5 @@
/* longjmp cleanup function for unwinding past signal handlers.
Copyright (C) 1995 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -41,7 +41,15 @@ _hurdsig_longjmp_from_handler (void *data, jmp_buf env, int val)
mach_port_t *reply_port =
(mach_port_t *) __hurd_threadvar_location (_HURD_THREADVAR_MIG_REPLY);
if (*reply_port)
__mach_port_destroy (__mach_task_self (), *reply_port);
{
mach_port_t port = *reply_port;
/* Assigning MACH_PORT_DEAD here tells libc's mig_get_reply_port
not to get another reply port, but avoids mig_dealloc_reply_port
trying to deallocate it after the receive fails (which it will,
because the reply port will be bogus, regardless). */
*reply_port = MACH_PORT_DEAD;
__mach_port_destroy (__mach_task_self (), port);
}
*reply_port = scp->sc_reply_port;
}