diff options
Diffstat (limited to 'hurd/hurd/signal.h')
| -rw-r--r-- | hurd/hurd/signal.h | 49 |
1 files changed, 9 insertions, 40 deletions
diff --git a/hurd/hurd/signal.h b/hurd/hurd/signal.h index b494f4922e..1973bcdb3c 100644 --- a/hurd/hurd/signal.h +++ b/hurd/hurd/signal.h @@ -1,5 +1,5 @@ /* Implementing POSIX.1 signals under the Hurd. -Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc. +Copyright (C) 1993, 1994, 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 @@ -40,6 +40,7 @@ Cambridge, MA 02139, USA. */ #include <cthreads.h> /* For `struct mutex'. */ #include <spin-lock.h> #include <hurd/threadvar.h> /* We cache sigstate in a threadvar. */ +struct hurd_signal_preempter; /* <hurd/sigpreempt.h> */ /* Per-thread signal state. */ @@ -57,6 +58,13 @@ struct hurd_sigstate sigset_t pending; /* Pending signals, possibly blocked. */ struct sigaction actions[NSIG]; struct sigaltstack sigaltstack; + + /* Chain of thread-local signal preempters; see <hurd/sigpreempt.h>. + Each element of this chain is in local stack storage, and the chain + parallels the stack: the head of this chain is in the innermost + stack frame, and each next element in an outermore frame. */ + struct hurd_signal_preempter *preempters; + struct { /* For each signal that may be pending, the @@ -330,45 +338,6 @@ extern mach_msg_timeout_t _hurd_interrupted_rpc_timeout; __err == MIG_SERVER_DIED); \ __err; \ }) - -/* Some other parts of the library need to preempt signals, to detect - errors that should not result in a POSIX signal. For example, when - some mapped region of memory is used, an extraneous SIGSEGV might be - generated when the mapping server returns an error for a page fault. */ - -struct hurd_signal_preempt - { - /* Function to examine a thread receiving a given signal. The handler - is called even for blocked signals. This function is run in the - signal thread, with THREAD's sigstate locked; it should be as simple - and robust as possible. THREAD is the thread which is about to - receive the signal. SIGNO and SIGCODE would be passed to the normal - handler. - - If the return value is SIG_DFL, normal signal processing continues. - If it is SIG_IGN, the signal is ignored. - Any other value is used in place of the normal handler. */ - sighandler_t (*handler) (thread_t thread, - int signo, long int sigcode, int sigerror); - long int first, last; /* Range of sigcodes this handler wants. */ - struct hurd_signal_preempt *next; /* Next handler on the chain. */ - }; - -extern struct hurd_signal_preempt *_hurd_signal_preempt[NSIG]; -extern struct mutex _hurd_signal_preempt_lock; - -/* Install a signal preempter for the given signal and range. - The caller is responsible for the storage for PREEMPTER. */ -extern int hurd_preempt_signals (struct hurd_signal_preempt *preempter, - int signo, int first_code, int last_code, - sighandler_t (*handler) (thread_t, - int, long int, int)); - -/* Remove the signal preempter previously installed by calling - `hurd_preempt_signals' with PREEMPTER and SIGNO. */ -extern int hurd_unpreempt_signals (struct hurd_signal_preempt *preempter, - int signo); - #endif /* hurd/signal.h */ |