cbf4e354ec
1. Add tm_lwpid into kse_thr_mailbox to indicate which kernel thread current user thread is running on. Add tm_dflags into kse_thr_mailbox, the flags is written by debugger, it tells UTS and kernel what should be done when the process is being debugged, current, there two flags TMDF_SSTEP and TMDF_DONOTRUNUSER. TMDF_SSTEP is used to tell kernel to turn on single stepping, or turn off if it is not set. TMDF_DONOTRUNUSER is used to tell kernel to schedule upcall whenever possible, to UTS, it means do not run the user thread until debugger clears it, this behaviour is necessary because gdb wants to resume only one thread when the thread's pc is at a breakpoint, and thread needs to go forward, in order to avoid other threads sneak pass the breakpoints, it needs to remove breakpoint, only wants one thread to go. Also, add km_lwp to kse_mailbox, the lwp id is copied to kse_thr_mailbox at context switch time when process is not being debugged, so when process is attached, debugger can map kernel thread to user thread. 2. Add p_xthread to proc strcuture and td_xsig to thread structure. p_xthread is used by a thread when it wants to report event to debugger, every thread can set the pointer, especially, when it is used in ptracestop, it is the last thread reporting event will win the race. Every thread has a td_xsig to exchange signal with debugger, thread uses TDF_XSIG flag to indicate it is reporting signal to debugger, if the flag is not cleared, thread will keep retrying until it is cleared by debugger, p_xthread may be used by debugger to indicate CURRENT thread. The p_xstat is still in proc structure to keep wait() to work, in future, we may just use td_xsig. 3. Add TDF_DBSUSPEND flag, the flag is used by debugger to suspend a thread. When process stops, debugger can set the flag for thread, thread will check the flag in thread_suspend_check, enters a loop, unless it is cleared by debugger, process is detached or process is existing. The flag is also checked in ptracestop, so debugger can temporarily suspend a thread even if the thread wants to exchange signal. 4. Current, in ptrace, we always resume all threads, but if a thread has already a TDF_DBSUSPEND flag set by debugger, it won't run. Encouraged by: marcel, julian, deischen
284 lines
8.6 KiB
C
284 lines
8.6 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)signalvar.h 8.6 (Berkeley) 2/19/95
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* $FreeBSD$
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*/
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#ifndef _SYS_SIGNALVAR_H_
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#define _SYS_SIGNALVAR_H_
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/signal.h>
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/*
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* Kernel signal definitions and data structures,
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* not exported to user programs.
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*/
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/*
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* Logical process signal actions and state, needed only within the process
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* The mapping between sigacts and proc structures is 1:1 except for rfork()
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* processes masquerading as threads which use one structure for the whole
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* group. All members are locked by the included mutex. The reference count
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* and mutex must be last for the bcopy in sigacts_copy() to work.
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*/
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struct sigacts {
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sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
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sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */
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sigset_t ps_sigonstack; /* Signals to take on sigstack. */
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sigset_t ps_sigintr; /* Signals that interrupt syscalls. */
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sigset_t ps_sigreset; /* Signals that reset when caught. */
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sigset_t ps_signodefer; /* Signals not masked while handled. */
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sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */
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sigset_t ps_sigignore; /* Signals being ignored. */
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sigset_t ps_sigcatch; /* Signals being caught by user. */
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sigset_t ps_freebsd4; /* signals using freebsd4 ucontext. */
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sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */
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sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */
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int ps_flag;
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int ps_refcnt;
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struct mtx ps_mtx;
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};
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#define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
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#define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
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#define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
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#if defined(_KERNEL) && defined(COMPAT_43)
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/*
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* Compatibility.
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*/
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typedef struct {
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struct osigcontext si_sc;
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int si_signo;
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int si_code;
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union sigval si_value;
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} osiginfo_t;
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struct osigaction {
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union {
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void (*__sa_handler)(int);
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void (*__sa_sigaction)(int, osiginfo_t *, void *);
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} __sigaction_u; /* signal handler */
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osigset_t sa_mask; /* signal mask to apply */
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int sa_flags; /* see signal options below */
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};
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typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
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#endif /* _KERNEL && COMPAT_43 */
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/* additional signal action values, used only temporarily/internally */
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#define SIG_CATCH ((__sighandler_t *)2)
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#define SIG_HOLD ((__sighandler_t *)3)
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/*
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* get signal action for process and signal; currently only for current process
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*/
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#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
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/*
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* sigset_t manipulation macros
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*/
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#define SIGADDSET(set, signo) \
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((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
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#define SIGDELSET(set, signo) \
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((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
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#define SIGEMPTYSET(set) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set).__bits[__i] = 0; \
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} while (0)
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#define SIGFILLSET(set) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set).__bits[__i] = ~0U; \
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} while (0)
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#define SIGISMEMBER(set, signo) \
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((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
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#define SIGISEMPTY(set) (__sigisempty(&(set)))
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#define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
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#define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2)))
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#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
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#define SIGSETOR(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] |= (set2).__bits[__i]; \
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} while (0)
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#define SIGSETAND(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] &= (set2).__bits[__i]; \
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} while (0)
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#define SIGSETNAND(set1, set2) \
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do { \
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int __i; \
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for (__i = 0; __i < _SIG_WORDS; __i++) \
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(set1).__bits[__i] &= ~(set2).__bits[__i]; \
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} while (0)
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#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
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#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
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#define SIG_CANTMASK(set) \
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SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
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#define SIG_STOPSIGMASK(set) \
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SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
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SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
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#define SIG_CONTSIGMASK(set) \
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SIGDELSET(set, SIGCONT)
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#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
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#define SIG2OSIG(sig, osig) (osig = (sig).__bits[0])
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#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
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static __inline int
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__sigisempty(sigset_t *set)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set->__bits[i])
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return (0);
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}
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return (1);
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}
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static __inline int
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__sigseteq(sigset_t *set1, sigset_t *set2)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set1->__bits[i] != set2->__bits[i])
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return (0);
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}
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return (1);
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}
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#ifdef _KERNEL
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/*
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* Specifies the target of a signal.
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* P - Doesn't matter which thread it gets delivered to.
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* TD - Must be delivered to a specific thread.
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*/
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typedef enum sigtarget_enum { SIGTARGET_P, SIGTARGET_TD } sigtarget_t;
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/* Return nonzero if process p has an unmasked pending signal. */
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#define SIGPENDING(td) \
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(!SIGISEMPTY((td)->td_siglist) && \
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!sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask))
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/*
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* Return the value of the pseudo-expression ((*set & ~*mask) != 0). This
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* is an optimized version of SIGISEMPTY() on a temporary variable
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* containing SIGSETNAND(*set, *mask).
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*/
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static __inline int
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sigsetmasked(sigset_t *set, sigset_t *mask)
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{
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int i;
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for (i = 0; i < _SIG_WORDS; i++) {
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if (set->__bits[i] & ~mask->__bits[i])
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return (0);
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}
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return (1);
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}
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struct pgrp;
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struct thread;
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struct proc;
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struct sigio;
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struct mtx;
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extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
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extern struct mtx sigio_lock;
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/*
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* Lock the pointers for a sigio object in the underlying objects of
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* a file descriptor.
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*/
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#define SIGIO_LOCK() mtx_lock(&sigio_lock)
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#define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
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#define SIGIO_UNLOCK() mtx_unlock(&sigio_lock)
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#define SIGIO_LOCKED() mtx_owned(&sigio_lock)
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#define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type)
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/*
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* Machine-independent functions:
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*/
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int cursig(struct thread *td);
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void execsigs(struct proc *p);
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void gsignal(int pgid, int sig);
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void killproc(struct proc *p, char *why);
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void pgsigio(struct sigio **, int signum, int checkctty);
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void pgsignal(struct pgrp *pgrp, int sig, int checkctty);
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void postsig(int sig);
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void psignal(struct proc *p, int sig);
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struct sigacts *sigacts_alloc(void);
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void sigacts_copy(struct sigacts *dest, struct sigacts *src);
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void sigacts_free(struct sigacts *ps);
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struct sigacts *sigacts_hold(struct sigacts *ps);
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int sigacts_shared(struct sigacts *ps);
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void sigexit(struct thread *td, int signum) __dead2;
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int sig_ffs(sigset_t *set);
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void siginit(struct proc *p);
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void signotify(struct thread *td);
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void tdsignal(struct thread *td, int sig, sigtarget_t target);
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void trapsignal(struct thread *td, int sig, u_long code);
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int ptracestop(struct thread *td, int sig);
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/*
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* Machine-dependent functions:
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*/
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void sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
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#endif /* _KERNEL */
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#endif /* !_SYS_SIGNALVAR_H_ */
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