File: [cvs.NetBSD.org] / src / sys / sys / signalvar.h (download)
Revision 1.90, Tue May 1 16:37:23 2018 UTC (5 years, 10 months ago) by kamil
Branch: MAIN
CVS Tags: pgoyette-compat-0502 Changes since 1.89: +3 -1
lines
Implement PTRACE_VFORK
Add support for tracing vfork(2) events in the context of ptrace(2).
This API covers other frontends to fork1(9) like posix_spawn(2) or clone(2),
if they cause parent to wait for exec(2) or exit(2) of the child.
Changes:
- Add new argument to sigswitch() determining whether we need to acquire
the proc_lock or whether it's already held.
- Refactor fork1(9) for fork(2) and vfork(2)-like events.
Call sigswitch() from fork(1) for forking or vforking parent, instead of
emitting kpsignal(9). We need to emit the signal and suspend the parent,
returning to user and relock proc_lock.
- Add missing prototype for proc_stop_done() in kern_sig.c.
- Make sigswitch a public function accessible from other kernel code
including <sys/signalvar.h>.
- Remove an entry about unimplemented PTRACE_VFORK in the ptrace(2) man page.
- Permin PTRACE_VFORK in the ptrace(2) frontend for userland.
- Remove expected failure for unimplemented PTRACE_VFORK tests in the ATF
ptrace(2) test-suite.
- Relax signal routing constraints under a debugger for a vfork(2)ed child.
This intended to protect from signaling a parent of a vfork(2)ed child that
called PT_TRACE_ME, but wrongly misrouted other signals in vfork(2)
use-cases.
Add XXX comments about still existing problems and future enhancements:
- correct vfork(2) + PT_TRACE_ME handling.
- fork1(2) handling of scenarios when a process is collected in valid but
rare cases.
All ATF ptrace(2) fork[1-8] and vfork[1-8] tests pass.
Fix PR kern/51630 by Kamil Rytarowski (myself).
Sponsored by <The NetBSD Foundation>
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/* $NetBSD: signalvar.h,v 1.90 2018/05/01 16:37:23 kamil Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)signalvar.h 8.6 (Berkeley) 2/19/95
*/
#ifndef _SYS_SIGNALVAR_H_
#define _SYS_SIGNALVAR_H_
#include <sys/siginfo.h>
#include <sys/queue.h>
#include <sys/mutex.h>
#include <sys/stdbool.h>
/*
* Kernel signal definitions and data structures,
* not exported to user programs.
*/
/*
* Queue of signals.
*/
typedef TAILQ_HEAD(ksiginfoq, ksiginfo) ksiginfoq_t;
/*
* Process signal actions, possibly shared between processes.
*/
struct sigacts {
struct sigact_sigdesc {
struct sigaction sd_sigact;
const void *sd_tramp;
int sd_vers;
} sa_sigdesc[NSIG]; /* disposition of signals */
int sa_refcnt; /* reference count */
kmutex_t sa_mutex; /* lock on sa_refcnt */
};
/*
* Pending signals, per LWP and per process.
*/
typedef struct sigpend {
ksiginfoq_t sp_info;
sigset_t sp_set;
} sigpend_t;
/*
* Process signal state.
*/
struct sigctx {
struct _ksiginfo ps_info; /* for core dump/debugger XXX */
int ps_lwp; /* for core dump/debugger XXX */
bool ps_faked; /* for core dump/debugger XXX */
void *ps_sigcode; /* address of signal trampoline */
sigset_t ps_sigignore; /* Signals being ignored. */
sigset_t ps_sigcatch; /* Signals being caught by user. */
};
/* additional signal action values, used only temporarily/internally */
#define SIG_CATCH (void (*)(int))2
/*
* get signal action for process and signal; currently only for current process
*/
#define SIGACTION(p, sig) (p->p_sigacts->sa_sigdesc[(sig)].sd_sigact)
#define SIGACTION_PS(ps, sig) (ps->sa_sigdesc[(sig)].sd_sigact)
/*
* Signal properties and actions.
* The array below categorizes the signals and their default actions
* according to the following properties:
*/
#define SA_KILL 0x0001 /* terminates process by default */
#define SA_CORE 0x0002 /* ditto and coredumps */
#define SA_STOP 0x0004 /* suspend process */
#define SA_TTYSTOP 0x0008 /* ditto, from tty */
#define SA_IGNORE 0x0010 /* ignore by default */
#define SA_CONT 0x0020 /* continue if suspended */
#define SA_CANTMASK 0x0040 /* non-maskable, catchable */
#define SA_NORESET 0x0080 /* not reset when caught */
#define SA_TOLWP 0x0100 /* to LWP that generated, if local */
#define SA_TOALL 0x0200 /* always to all LWPs */
#ifdef _KERNEL
#include <sys/systm.h> /* for copyin_t/copyout_t */
extern sigset_t contsigmask, sigcantmask;
struct vnode;
struct coredump_iostate;
/*
* Machine-independent functions:
*/
int coredump_netbsd(struct lwp *, struct coredump_iostate *);
void execsigs(struct proc *);
int issignal(struct lwp *);
void pgsignal(struct pgrp *, int, int);
void kpgsignal(struct pgrp *, struct ksiginfo *, void *, int);
void postsig(int);
void psignal(struct proc *, int);
void kpsignal(struct proc *, struct ksiginfo *, void *);
void child_psignal(struct proc *, int);
void siginit(struct proc *);
void trapsignal(struct lwp *, struct ksiginfo *);
void sigexit(struct lwp *, int) __dead;
void killproc(struct proc *, const char *);
void setsigvec(struct proc *, int, struct sigaction *);
int killpg1(struct lwp *, struct ksiginfo *, int, int);
void proc_unstop(struct proc *p);
void sigswitch(int, int, bool);
int sigaction1(struct lwp *, int, const struct sigaction *,
struct sigaction *, const void *, int);
int sigprocmask1(struct lwp *, int, const sigset_t *, sigset_t *);
void sigpending1(struct lwp *, sigset_t *);
void sigsuspendsetup(struct lwp *, const sigset_t *);
void sigsuspendteardown(struct lwp *);
int sigsuspend1(struct lwp *, const sigset_t *);
int sigaltstack1(struct lwp *, const struct sigaltstack *,
struct sigaltstack *);
int sigismasked(struct lwp *, int);
int sigget(sigpend_t *, ksiginfo_t *, int, const sigset_t *);
void sigclear(sigpend_t *, const sigset_t *, ksiginfoq_t *);
void sigclearall(struct proc *, const sigset_t *, ksiginfoq_t *);
int kpsignal2(struct proc *, ksiginfo_t *);
void signal_init(void);
struct sigacts *sigactsinit(struct proc *, int);
void sigactsunshare(struct proc *);
void sigactsfree(struct sigacts *);
void kpsendsig(struct lwp *, const struct ksiginfo *, const sigset_t *);
void sendsig_reset(struct lwp *, int);
void sendsig(const struct ksiginfo *, const sigset_t *);
ksiginfo_t *ksiginfo_alloc(struct proc *, ksiginfo_t *, int);
void ksiginfo_free(ksiginfo_t *);
void ksiginfo_queue_drain0(ksiginfoq_t *);
struct sys_____sigtimedwait50_args;
int sigtimedwait1(struct lwp *, const struct sys_____sigtimedwait50_args *,
register_t *, copyin_t, copyout_t, copyin_t, copyout_t);
void signotify(struct lwp *);
int sigispending(struct lwp *, int);
/*
* Machine-dependent functions:
*/
void sendsig_sigcontext(const struct ksiginfo *, const sigset_t *);
void sendsig_siginfo(const struct ksiginfo *, const sigset_t *);
extern struct pool ksiginfo_pool;
/*
* Modularity / compatibility.
*/
extern void (*sendsig_sigcontext_vec)(const struct ksiginfo *,
const sigset_t *);
extern int (*coredump_vec)(struct lwp *, const char *);
/*
* firstsig:
*
* Return the first signal in a signal set.
*/
static __inline int
firstsig(const sigset_t *ss)
{
int sig;
sig = ffs(ss->__bits[0]);
if (sig != 0)
return (sig);
#if NSIG > 33
sig = ffs(ss->__bits[1]);
if (sig != 0)
return (sig + 32);
#endif
#if NSIG > 65
sig = ffs(ss->__bits[2]);
if (sig != 0)
return (sig + 64);
#endif
#if NSIG > 97
sig = ffs(ss->__bits[3]);
if (sig != 0)
return (sig + 96);
#endif
return (0);
}
static __inline void
ksiginfo_queue_init(ksiginfoq_t *kq)
{
TAILQ_INIT(kq);
}
static __inline void
ksiginfo_queue_drain(ksiginfoq_t *kq)
{
if (!TAILQ_EMPTY(kq))
ksiginfo_queue_drain0(kq);
}
#endif /* _KERNEL */
#ifdef _KERNEL
#ifdef SIGPROP
const int sigprop[NSIG] = {
0, /* 0 unused */
SA_KILL, /* 1 SIGHUP */
SA_KILL, /* 2 SIGINT */
SA_KILL|SA_CORE, /* 3 SIGQUIT */
SA_KILL|SA_CORE|SA_NORESET|SA_TOLWP, /* 4 SIGILL */
SA_KILL|SA_CORE|SA_NORESET|SA_TOLWP, /* 5 SIGTRAP */
SA_KILL|SA_CORE, /* 6 SIGABRT */
SA_KILL|SA_CORE|SA_TOLWP, /* 7 SIGEMT */
SA_KILL|SA_CORE|SA_TOLWP, /* 8 SIGFPE */
SA_KILL|SA_CANTMASK|SA_TOALL, /* 9 SIGKILL */
SA_KILL|SA_CORE|SA_TOLWP, /* 10 SIGBUS */
SA_KILL|SA_CORE|SA_TOLWP, /* 11 SIGSEGV */
SA_KILL|SA_CORE|SA_TOLWP, /* 12 SIGSYS */
SA_KILL, /* 13 SIGPIPE */
SA_KILL, /* 14 SIGALRM */
SA_KILL, /* 15 SIGTERM */
SA_IGNORE, /* 16 SIGURG */
SA_STOP|SA_CANTMASK|SA_TOALL, /* 17 SIGSTOP */
SA_STOP|SA_TTYSTOP|SA_TOALL, /* 18 SIGTSTP */
SA_IGNORE|SA_CONT|SA_TOALL, /* 19 SIGCONT */
SA_IGNORE, /* 20 SIGCHLD */
SA_STOP|SA_TTYSTOP|SA_TOALL, /* 21 SIGTTIN */
SA_STOP|SA_TTYSTOP|SA_TOALL, /* 22 SIGTTOU */
SA_IGNORE, /* 23 SIGIO */
SA_KILL, /* 24 SIGXCPU */
SA_KILL, /* 25 SIGXFSZ */
SA_KILL, /* 26 SIGVTALRM */
SA_KILL, /* 27 SIGPROF */
SA_IGNORE, /* 28 SIGWINCH */
SA_IGNORE, /* 29 SIGINFO */
SA_KILL, /* 30 SIGUSR1 */
SA_KILL, /* 31 SIGUSR2 */
SA_IGNORE|SA_NORESET, /* 32 SIGPWR */
SA_KILL, /* 33 SIGRTMIN + 0 */
SA_KILL, /* 34 SIGRTMIN + 1 */
SA_KILL, /* 35 SIGRTMIN + 2 */
SA_KILL, /* 36 SIGRTMIN + 3 */
SA_KILL, /* 37 SIGRTMIN + 4 */
SA_KILL, /* 38 SIGRTMIN + 5 */
SA_KILL, /* 39 SIGRTMIN + 6 */
SA_KILL, /* 40 SIGRTMIN + 7 */
SA_KILL, /* 41 SIGRTMIN + 8 */
SA_KILL, /* 42 SIGRTMIN + 9 */
SA_KILL, /* 43 SIGRTMIN + 10 */
SA_KILL, /* 44 SIGRTMIN + 11 */
SA_KILL, /* 45 SIGRTMIN + 12 */
SA_KILL, /* 46 SIGRTMIN + 13 */
SA_KILL, /* 47 SIGRTMIN + 14 */
SA_KILL, /* 48 SIGRTMIN + 15 */
SA_KILL, /* 49 SIGRTMIN + 16 */
SA_KILL, /* 50 SIGRTMIN + 17 */
SA_KILL, /* 51 SIGRTMIN + 18 */
SA_KILL, /* 52 SIGRTMIN + 19 */
SA_KILL, /* 53 SIGRTMIN + 20 */
SA_KILL, /* 54 SIGRTMIN + 21 */
SA_KILL, /* 55 SIGRTMIN + 22 */
SA_KILL, /* 56 SIGRTMIN + 23 */
SA_KILL, /* 57 SIGRTMIN + 24 */
SA_KILL, /* 58 SIGRTMIN + 25 */
SA_KILL, /* 59 SIGRTMIN + 26 */
SA_KILL, /* 60 SIGRTMIN + 27 */
SA_KILL, /* 61 SIGRTMIN + 28 */
SA_KILL, /* 62 SIGRTMIN + 29 */
SA_KILL, /* 63 SIGRTMIN + 30 */
};
#undef SIGPROP
#else
extern const int sigprop[NSIG];
#endif /* SIGPROP */
#endif /* _KERNEL */
#endif /* !_SYS_SIGNALVAR_H_ */