4.3BSD-Reno/src/sys/kern/kern_sig.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution is only permitted until one year after the first shipment
* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
* binary forms are permitted provided that: (1) source distributions retain
* this entire copyright notice and comment, and (2) distributions including
* binaries display the following acknowledgement: This product includes
* software developed by the University of California, Berkeley and its
* contributors'' in the documentation or other materials provided with the
* distribution and in all advertising materials mentioning features or use
* of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)kern_sig.c 7.23 (Berkeley) 6/28/90
*/
#include "param.h"
#include "systm.h"
#include "user.h"
#include "vnode.h"
#include "proc.h"
#include "timeb.h"
#include "times.h"
#include "buf.h"
#include "text.h"
#include "seg.h"
#include "vm.h"
#include "acct.h"
#include "uio.h"
#include "file.h"
#include "kernel.h"
#include "wait.h"
#include "ktrace.h"
#include "machine/reg.h"
#include "machine/pte.h"
#include "machine/psl.h"
#include "machine/mtpr.h"
#define ttystopsigmask (sigmask(SIGTSTP)|sigmask(SIGTTIN)|sigmask(SIGTTOU))
#define stopsigmask (sigmask(SIGSTOP)|ttystopsigmask)
#define defaultignmask (sigmask(SIGCONT)|sigmask(SIGIO)|sigmask(SIGURG)| \
sigmask(SIGCHLD)|sigmask(SIGWINCH)|sigmask(SIGINFO))
/*
* Can process p send the signal signo to process q?
*/
#define CANSIGNAL(p, q, signo) \
((p)->p_uid == 0 || \
(p)->p_ruid == (q)->p_ruid || (p)->p_uid == (q)->p_ruid || \
(p)->p_ruid == (q)->p_uid || (p)->p_uid == (q)->p_uid || \
((signo) == SIGCONT && (q)->p_session == (p)->p_session))
/* ARGSUSED */
sigaction(p, uap, retval)
struct proc *p;
register struct args {
int signo;
struct sigaction *nsa;
struct sigaction *osa;
} *uap;
int *retval;
{
struct sigaction vec;
register struct sigaction *sa;
register int sig;
int bit, error;
sig = uap->signo;
if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP)
return (EINVAL);
sa = &vec;
if (uap->osa) {
sa->sa_handler = u.u_signal[sig];
sa->sa_mask = u.u_sigmask[sig];
bit = sigmask(sig);
sa->sa_flags = 0;
if ((u.u_sigonstack & bit) != 0)
sa->sa_flags |= SA_ONSTACK;
if ((u.u_sigintr & bit) == 0)
sa->sa_flags |= SA_RESTART;
if (p->p_flag & SNOCLDSTOP)
sa->sa_flags |= SA_NOCLDSTOP;
if (error = copyout((caddr_t)sa, (caddr_t)uap->osa,
sizeof (vec)))
return (error);
}
if (uap->nsa) {
if (error = copyin((caddr_t)uap->nsa, (caddr_t)sa,
sizeof (vec)))
return (error);
setsigvec(p, sig, sa);
}
return (0);
}
setsigvec(p, sig, sa)
register struct proc *p;
int sig;
register struct sigaction *sa;
{
register int bit;
bit = sigmask(sig);
/*
* Change setting atomically.
*/
(void) splhigh();
u.u_signal[sig] = sa->sa_handler;
u.u_sigmask[sig] = sa->sa_mask &~ sigcantmask;
if ((sa->sa_flags & SA_RESTART) == 0)
u.u_sigintr |= bit;
else
u.u_sigintr &= ~bit;
if (sa->sa_flags & SA_ONSTACK)
u.u_sigonstack |= bit;
else
u.u_sigonstack &= ~bit;
if (sig == SIGCHLD) {
if (sa->sa_flags & SA_NOCLDSTOP)
p->p_flag |= SNOCLDSTOP;
else
p->p_flag &= ~SNOCLDSTOP;
}
/*
* Set bit in p_sigignore for signals that are set to SIG_IGN,
* and for signals set to SIG_DFL where the default is to ignore.
* However, don't put SIGCONT in p_sigignore,
* as we have to restart the process.
*/
if (sa->sa_handler == SIG_IGN ||
(bit & defaultignmask && sa->sa_handler == SIG_DFL)) {
p->p_sig &= ~bit; /* never to be seen again */
if (sig != SIGCONT)
p->p_sigignore |= bit; /* easier in psignal */
p->p_sigcatch &= ~bit;
} else {
p->p_sigignore &= ~bit;
if (sa->sa_handler == SIG_DFL)
p->p_sigcatch &= ~bit;
else
p->p_sigcatch |= bit;
}
(void) spl0();
}
/*
* Initialize signal state for process 0;
* set to ignore signals that are ignored by default.
*/
siginit(p)
struct proc *p;
{
p->p_sigignore = defaultignmask &~ sigmask(SIGCONT);
}
/*
* Reset signals for an exec of the specified process.
*/
execsigs(p)
register struct proc *p;
{
register int nc, mask;
/*
* Reset caught signals. Held signals remain held
* through p_sigmask (unless they were caught,
* and are now ignored by default).
*/
while (p->p_sigcatch) {
nc = ffs((long)p->p_sigcatch);
mask = sigmask(nc);
p->p_sigcatch &= ~mask;
if (mask & defaultignmask) {
if (nc != SIGCONT)
p->p_sigignore |= mask;
p->p_sig &= ~mask;
}
u.u_signal[nc] = SIG_DFL;
}
/*
* Reset stack state to the user stack.
* Clear set of signals caught on the signal stack.
*/
u.u_onstack = 0;
u.u_sigsp = 0;
u.u_sigonstack = 0;
}
/*
* Manipulate signal mask.
* Note that we receive new mask, not pointer,
* and return old mask as return value;
* the library stub does the rest.
*/
sigprocmask(p, uap, retval)
register struct proc *p;
struct args {
int how;
sigset_t mask;
} *uap;
int *retval;
{
int error = 0;
*retval = p->p_sigmask;
(void) splhigh();
switch (uap->how) {
case SIG_BLOCK:
p->p_sigmask |= uap->mask &~ sigcantmask;
break;
case SIG_UNBLOCK:
p->p_sigmask &= ~uap->mask;
break;
case SIG_SETMASK:
p->p_sigmask = uap->mask &~ sigcantmask;
break;
default:
error = EINVAL;
break;
}
(void) spl0();
return (error);
}
/* ARGSUSED */
sigpending(p, uap, retval)
struct proc *p;
void *uap;
int *retval;
{
*retval = p->p_sig;
return (0);
}
#ifdef COMPAT_43
/*
* Generalized interface signal handler, 4.3-compatible.
*/
/* ARGSUSED */
osigvec(p, uap, retval)
struct proc *p;
register struct args {
int signo;
struct sigvec *nsv;
struct sigvec *osv;
} *uap;
int *retval;
{
struct sigvec vec;
register struct sigvec *sv;
register int sig;
int bit, error;
sig = uap->signo;
if (sig <= 0 || sig >= NSIG || sig == SIGKILL || sig == SIGSTOP)
return (EINVAL);
sv = &vec;
if (uap->osv) {
*(sig_t *)&sv->sv_handler = u.u_signal[sig];
sv->sv_mask = u.u_sigmask[sig];
bit = sigmask(sig);
sv->sv_flags = 0;
if ((u.u_sigonstack & bit) != 0)
sv->sv_flags |= SV_ONSTACK;
if ((u.u_sigintr & bit) != 0)
sv->sv_flags |= SV_INTERRUPT;
if (p->p_flag & SNOCLDSTOP)
sv->sv_flags |= SA_NOCLDSTOP;
if (error = copyout((caddr_t)sv, (caddr_t)uap->osv,
sizeof (vec)))
return (error);
}
if (uap->nsv) {
if (error = copyin((caddr_t)uap->nsv, (caddr_t)sv,
sizeof (vec)))
return (error);
sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
setsigvec(p, sig, (struct sigaction *)sv);
}
return (0);
}
osigblock(p, uap, retval)
register struct proc *p;
struct args {
int mask;
} *uap;
int *retval;
{
(void) splhigh();
*retval = p->p_sigmask;
p->p_sigmask |= uap->mask &~ sigcantmask;
(void) spl0();
return (0);
}
osigsetmask(p, uap, retval)
struct proc *p;
struct args {
int mask;
} *uap;
int *retval;
{
(void) splhigh();
*retval = p->p_sigmask;
p->p_sigmask = uap->mask &~ sigcantmask;
(void) spl0();
return (0);
}
#endif
/*
* Suspend process until signal, providing mask to be set
* in the meantime. Note nonstandard calling convention:
* libc stub passes mask, not pointer, to save a copyin.
*/
/* ARGSUSED */
sigsuspend(p, uap, retval)
register struct proc *p;
struct args {
sigset_t mask;
} *uap;
int *retval;
{
/*
* When returning from sigpause, we want
* the old mask to be restored after the
* signal handler has finished. Thus, we
* save it here and mark the proc structure
* to indicate this (should be in u.).
*/
u.u_oldmask = p->p_sigmask;
p->p_flag |= SOMASK;
p->p_sigmask = uap->mask &~ sigcantmask;
(void) tsleep((caddr_t)&u, PPAUSE | PCATCH, "pause", 0);
/* always return EINTR rather than ERESTART... */
return (EINTR);
}
/* ARGSUSED */
sigstack(p, uap, retval)
struct proc *p;
register struct args {
struct sigstack *nss;
struct sigstack *oss;
} *uap;
int *retval;
{
struct sigstack ss;
int error = 0;
if (uap->oss && (error = copyout((caddr_t)&u.u_sigstack,
(caddr_t)uap->oss, sizeof (struct sigstack))))
return (error);
if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss,
sizeof (ss))) == 0)
u.u_sigstack = ss;
return (error);
}
/* ARGSUSED */
kill(cp, uap, retval)
register struct proc *cp;
register struct args {
int pid;
int signo;
} *uap;
int *retval;
{
register struct proc *p;
if ((unsigned) uap->signo >= NSIG)
return (EINVAL);
if (uap->pid > 0) {
/* kill single process */
p = pfind(uap->pid);
if (p == 0)
return (ESRCH);
if (!CANSIGNAL(cp, p, uap->signo))
return (EPERM);
if (uap->signo)
psignal(p, uap->signo);
return (0);
}
switch (uap->pid) {
case -1: /* broadcast signal */
return (killpg1(cp, uap->signo, 0, 1));
case 0: /* signal own process group */
return (killpg1(cp, uap->signo, 0, 0));
default: /* negative explicit process group */
return (killpg1(cp, uap->signo, -uap->pid, 0));
}
/* NOTREACHED */
}
#ifdef COMPAT_43
/* ARGSUSED */
okillpg(p, uap, retval)
struct proc *p;
register struct args {
int pgid;
int signo;
} *uap;
int *retval;
{
if ((unsigned) uap->signo >= NSIG)
return (EINVAL);
return (killpg1(p, uap->signo, uap->pgid, 0));
}
#endif
/*
* Common code for kill process group/broadcast kill.
* cp is calling process.
*/
killpg1(cp, signo, pgid, all)
register struct proc *cp;
int signo, pgid, all;
{
register struct proc *p;
struct pgrp *pgrp;
int f = 0;
if (all)
/*
* broadcast
*/
for (p = allproc; p != NULL; p = p->p_nxt) {
if (p->p_ppid == 0 || p->p_flag&SSYS ||
p == u.u_procp || !CANSIGNAL(cp, p, signo))
continue;
f++;
if (signo)
psignal(p, signo);
}
else {
if (pgid == 0)
/*
* zero pgid means send to my process group.
*/
pgrp = u.u_procp->p_pgrp;
else {
pgrp = pgfind(pgid);
if (pgrp == NULL)
return (ESRCH);
}
for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt) {
if (p->p_ppid == 0 || p->p_flag&SSYS ||
!CANSIGNAL(cp, p, signo))
continue;
f++;
if (signo)
psignal(p, signo);
}
}
return (f ? 0 : ESRCH);
}
/*
* Send the specified signal to
* all processes with 'pgid' as
* process group.
*/
gsignal(pgid, sig)
{
struct pgrp *pgrp;
if (pgid && (pgrp = pgfind(pgid)))
pgsignal(pgrp, sig, 0);
}
/*
* Send sig to every member of a process group.
* If checktty is 1, limit to members which have a controlling
* terminal.
*/
pgsignal(pgrp, sig, checkctty)
struct pgrp *pgrp;
{
register struct proc *p;
if (pgrp)
for (p = pgrp->pg_mem; p != NULL; p = p->p_pgrpnxt)
if (checkctty == 0 || p->p_flag&SCTTY)
psignal(p, sig);
}
/*
* Send a signal caused by a trap to the current process.
* If it will be caught immediately, deliver it with correct code.
* Otherwise, post it normally.
*/
trapsignal(sig, code)
register int sig;
unsigned code;
{
register struct proc *p = u.u_procp; /* XXX */
int mask;
mask = sigmask(sig);
if ((p->p_flag & STRC) == 0 && (p->p_sigcatch & mask) != 0 &&
(p->p_sigmask & mask) == 0) {
u.u_ru.ru_nsignals++;
#ifdef KTRACE
if (KTRPOINT(p, KTR_PSIG))
ktrpsig(p->p_tracep, sig, u.u_signal[sig],
p->p_sigmask, code);
#endif
sendsig(u.u_signal[sig], sig, p->p_sigmask, code);
p->p_sigmask |= u.u_sigmask[sig] | mask;
} else {
u.u_code = code; /* XXX for core dump/debugger */
psignal(p, sig);
}
}
/*
* Send the specified signal to the specified process.
* Most signals do not do anything directly to a process;
* they set a flag that asks the process to do something to itself.
* Exceptions:
* o When a stop signal is sent to a sleeping process that takes the default
* action, the process is stopped without awakening it.
* o SIGCONT restarts stopped processes (or puts them back to sleep)
* regardless of the signal action (eg, blocked or ignored).
* Other ignored signals are discarded immediately.
*/
psignal(p, sig)
register struct proc *p;
register int sig;
{
register int s;
register sig_t action;
int mask;
if ((unsigned)sig >= NSIG || sig == 0)
panic("psignal sig");
mask = sigmask(sig);
/*
* If proc is traced, always give parent a chance.
*/
if (p->p_flag & STRC)
action = SIG_DFL;
else {
/*
* If the signal is being ignored,
* then we forget about it immediately.
* (Note: we don't set SIGCONT in p_sigignore,
* and if it is set to SIG_IGN,
* action will be SIG_DFL here.)
*/
if (p->p_sigignore & mask)
return;
if (p->p_sigmask & mask)
action = SIG_HOLD;
else if (p->p_sigcatch & mask)
action = SIG_CATCH;
else
action = SIG_DFL;
}
switch (sig) {
case SIGTERM:
if ((p->p_flag&STRC) || action != SIG_DFL)
break;
/* FALLTHROUGH */
case SIGKILL:
if (p->p_nice > NZERO)
p->p_nice = NZERO;
break;
case SIGCONT:
p->p_sig &= ~stopsigmask;
break;
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
case SIGSTOP:
p->p_sig &= ~sigmask(SIGCONT);
break;
}
p->p_sig |= mask;
/*
* Defer further processing for signals which are held,
* except that stopped processes must be continued by SIGCONT.
*/
if (action == SIG_HOLD && (sig != SIGCONT || p->p_stat != SSTOP))
return;
s = splhigh();
switch (p->p_stat) {
case SSLEEP:
/*
* If process is sleeping uninterruptibly
* we can't interrupt the sleep... the signal will
* be noticed when the process returns through
* trap() or syscall().
*/
if ((p->p_flag & SSINTR) == 0)
goto out;
/*
* Process is sleeping and traced... make it runnable
* so it can discover the signal in issig() and stop
* for the parent.
*/
if (p->p_flag&STRC)
goto run;
/*
* When a sleeping process receives a stop
* signal, process immediately if possible.
* All other (caught or default) signals
* cause the process to run.
*/
if (mask & stopsigmask) {
if (action != SIG_DFL)
goto runfast;
/*
* If a child in vfork(), stopping could
* cause deadlock.
*/
if (p->p_flag&SVFORK)
goto out;
p->p_sig &= ~mask;
p->p_xstat = sig;
if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0)
psignal(p->p_pptr, SIGCHLD);
stop(p);
goto out;
} else
goto runfast;
/*NOTREACHED*/
case SSTOP:
/*
* If traced process is already stopped,
* then no further action is necessary.
*/
if (p->p_flag&STRC)
goto out;
switch (sig) {
case SIGKILL:
/*
* Kill signal always sets processes running.
*/
goto runfast;
case SIGCONT:
/*
* If SIGCONT is default (or ignored), we continue
* the process but don't leave the signal in p_sig,
* as it has no further action. If SIGCONT is held,
* continue the process and leave the signal in p_sig.
* If the process catches SIGCONT, let it handle
* the signal itself. If it isn't waiting on
* an event, then it goes back to run state.
* Otherwise, process goes back to sleep state.
*/
if (action == SIG_DFL)
p->p_sig &= ~mask;
if (action == SIG_CATCH)
goto runfast;
if (p->p_wchan == 0)
goto run;
p->p_stat = SSLEEP;
goto out;
case SIGSTOP:
case SIGTSTP:
case SIGTTIN:
case SIGTTOU:
/*
* Already stopped, don't need to stop again.
* (If we did the shell could get confused.)
*/
p->p_sig &= ~mask; /* take it away */
goto out;
default:
/*
* If process is sleeping interruptibly, then
* simulate a wakeup so that when it is continued,
* it will be made runnable and can look at the signal.
* But don't setrun the process, leave it stopped.
*/
if (p->p_wchan && p->p_flag & SSINTR)
unsleep(p);
goto out;
}
/*NOTREACHED*/
default:
/*
* SRUN, SIDL, SZOMB do nothing with the signal,
* other than kicking ourselves if we are running.
* It will either never be noticed, or noticed very soon.
*/
if (p == u.u_procp && !noproc)
aston();
goto out;
}
/*NOTREACHED*/
runfast:
/*
* Raise priority to at least PUSER.
*/
if (p->p_pri > PUSER)
p->p_pri = PUSER;
run:
setrun(p);
out:
splx(s);
}
/*
* If the current process has a signal to process (should be caught
* or cause termination, should interrupt current syscall),
* return the signal number. Stop signals with default action
* are processed immediately, then cleared; they aren't returned.
* This is asked at least once each time a process enters the
* system (though this can usually be done without actually
* calling issig by checking the pending signal masks.)
*/
issig()
{
register struct proc *p = u.u_procp; /* XXX */
register int sig, mask;
for (;;) {
mask = p->p_sig &~ p->p_sigmask;
if (p->p_flag&SVFORK)
mask &= ~stopsigmask;
if (mask == 0) /* no signal to send */
return (0);
sig = ffs((long)mask);
mask = sigmask(sig);
/*
* We should see pending but ignored signals
* only if STRC was on when they were posted.
*/
if (mask & p->p_sigignore && (p->p_flag&STRC) == 0) {
p->p_sig &= ~mask;
continue;
}
if (p->p_flag&STRC && (p->p_flag&SVFORK) == 0) {
/*
* If traced, always stop, and stay
* stopped until released by the parent.
*/
p->p_xstat = sig;
psignal(p->p_pptr, SIGCHLD);
do {
stop(p);
swtch();
} while (!procxmt(p) && p->p_flag&STRC);
/*
* If the traced bit got turned off,
* go back up to the top to rescan signals.
* This ensures that p_sig* and u_signal are consistent.
*/
if ((p->p_flag&STRC) == 0)
continue;
/*
* If parent wants us to take the signal,
* then it will leave it in p->p_xstat;
* otherwise we just look for signals again.
*/
p->p_sig &= ~mask; /* clear the old signal */
sig = p->p_xstat;
if (sig == 0)
continue;
/*
* Put the new signal into p_sig.
* If signal is being masked,
* look for other signals.
*/
mask = sigmask(sig);
p->p_sig |= mask;
if (p->p_sigmask & mask)
continue;
}
/*
* Decide whether the signal should be returned.
* Return the signal's number, or fall through
* to clear it from the pending mask.
*/
switch ((int)u.u_signal[sig]) {
case SIG_DFL:
/*
* Don't take default actions on system processes.
*/
if (p->p_ppid == 0)
break; /* == ignore */
/*
* If there is a pending stop signal to process
* with default action, stop here,
* then clear the signal. However,
* if process is member of an orphaned
* process group, ignore tty stop signals.
*/
if (mask & stopsigmask) {
if (p->p_flag&STRC ||
(p->p_pgrp->pg_jobc == 0 &&
mask & ttystopsigmask))
break; /* == ignore */
p->p_xstat = sig;
stop(p);
if ((p->p_pptr->p_flag & SNOCLDSTOP) == 0)
psignal(p->p_pptr, SIGCHLD);
swtch();
break;
} else if (mask & defaultignmask) {
/*
* Except for SIGCONT, shouldn't get here.
* Default action is to ignore; drop it.
*/
break; /* == ignore */
} else
return (sig);
/*NOTREACHED*/
case SIG_IGN:
/*
* Masking above should prevent us ever trying
* to take action on an ignored signal other
* than SIGCONT, unless process is traced.
*/
if (sig != SIGCONT && (p->p_flag&STRC) == 0)
printf("issig\n");
break; /* == ignore */
default:
/*
* This signal has an action, let
* psig process it.
*/
return (sig);
}
p->p_sig &= ~mask; /* take the signal! */
}
/* NOTREACHED */
}
/*
* Put the argument process into the stopped
* state and notify the parent via wakeup.
* Signals are handled elsewhere.
* The process must not be on the run queue.
*/
stop(p)
register struct proc *p;
{
p->p_stat = SSTOP;
p->p_flag &= ~SWTED;
wakeup((caddr_t)p->p_pptr);
}
/*
* Perform the action specified by the current signal.
* The usual sequence is:
* if (sig = CURSIG(p))
* psig(sig);
*/
psig(sig)
register int sig;
{
register struct proc *p = u.u_procp;
int mask, returnmask;
register sig_t action;
do {
#ifdef DIAGNOSTIC
if (sig == 0)
panic("psig");
#endif
mask = sigmask(sig);
p->p_sig &= ~mask;
action = u.u_signal[sig];
#ifdef KTRACE
if (KTRPOINT(p, KTR_PSIG))
ktrpsig(p->p_tracep, sig, action, p->p_flag & SOMASK ?
u.u_oldmask : p->p_sigmask, 0);
#endif
if (action != SIG_DFL) {
#ifdef DIAGNOSTIC
if (action == SIG_IGN || (p->p_sigmask & mask))
panic("psig action");
#endif
/*
* Set the new mask value and also defer further
* occurences of this signal.
*
* Special case: user has done a sigpause. Here the
* current mask is not of interest, but rather the
* mask from before the sigpause is what we want
* restored after the signal processing is completed.
*/
(void) splhigh();
if (p->p_flag & SOMASK) {
returnmask = u.u_oldmask;
p->p_flag &= ~SOMASK;
} else
returnmask = p->p_sigmask;
p->p_sigmask |= u.u_sigmask[sig] | mask;
(void) spl0();
u.u_ru.ru_nsignals++;
sendsig(action, sig, returnmask, 0);
continue;
}
u.u_acflag |= AXSIG;
switch (sig) {
case SIGILL:
case SIGIOT:
case SIGBUS:
case SIGQUIT:
case SIGTRAP:
case SIGEMT:
case SIGFPE:
case SIGSEGV:
case SIGSYS:
u.u_sig = sig;
if (core() == 0)
sig |= WCOREFLAG;
}
exit(p, W_EXITCODE(0, sig));
/* NOTREACHED */
} while (sig = CURSIG(p));
}
/*
* Create a core image on the file "core".
* It writes UPAGES block of the
* user.h area followed by the entire
* data+stack segments.
*/
core()
{
register struct vnode *vp;
register struct proc *p = u.u_procp;
register struct nameidata *ndp = &u.u_nd;
struct vattr vattr;
int error;
if (p->p_svuid != p->p_ruid || p->p_svgid != p->p_rgid)
return (EFAULT);
if (ctob(UPAGES + u.u_dsize + u.u_ssize) >=
u.u_rlimit[RLIMIT_CORE].rlim_cur)
return (EFAULT);
if (p->p_textp) {
VOP_LOCK(p->p_textp->x_vptr);
error = VOP_ACCESS(p->p_textp->x_vptr, VREAD, u.u_cred);
VOP_UNLOCK(p->p_textp->x_vptr);
if (error)
return (EFAULT);
}
ndp->ni_segflg = UIO_SYSSPACE;
ndp->ni_dirp = "core";
if (error = vn_open(ndp, FCREAT|FWRITE, 0644))
return (error);
vp = ndp->ni_vp;
VOP_LOCK(vp);
if (vp->v_type != VREG ||
VOP_GETATTR(vp, &vattr, u.u_cred) ||
vattr.va_nlink != 1) {
vput(vp);
return (EFAULT);
}
#ifdef MAPMEM
if (error = mmcore(p)) {
vput(vp);
return (error);
}
#endif
VATTR_NULL(&vattr);
vattr.va_size = 0;
VOP_SETATTR(vp, &vattr, u.u_cred);
u.u_acflag |= ACORE;
#ifdef HPUXCOMPAT
/*
* BLETCH! If we loaded from an HPUX format binary file
* we have to dump an HPUX style user struct so that the
* HPUX debuggers can grok it.
*/
if (u.u_pcb.pcb_flags & PCB_HPUXBIN)
error = hpuxdumpu(vp, ndp->ni_cred);
else
#endif
error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&u, ctob(UPAGES), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, ndp->ni_cred, (int *)0);
if (error == 0)
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)ctob(dptov(p, 0)),
(int)ctob(u.u_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE,
IO_NODELOCKED|IO_UNIT, ndp->ni_cred, (int *)0);
if (error == 0)
error = vn_rdwr(UIO_WRITE, vp,
(caddr_t)ctob(sptov(p, u.u_ssize - 1)),
(int)ctob(u.u_ssize),
(off_t)ctob(UPAGES) + ctob(u.u_dsize), UIO_USERSPACE,
IO_NODELOCKED|IO_UNIT, ndp->ni_cred, (int *)0);
vput(vp);
return (error);
}
/*
* Nonexistent system call-- signal process (may want to handle it).
* Flag error in case process won't see signal immediately (blocked or ignored).
*/
/* ARGSUSED */
nosys(p, args, retval)
struct proc *p;
void *args;
int *retval;
{
psignal(p, SIGSYS);
return (EINVAL);
}