ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /emu/NetBSD/os.c/
#include <sys/types.h>
#include <time.h>
#include <termios.h>
#include <signal.h>
#include <pwd.h>
#include <sched.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <errno.h>
#include "dat.h"
#include "fns.h"
#include "error.h"
/* For dynamic linking init/fini code that needs malloc */
void (*coherence)(void) = nofence;
enum
{
DELETE = 0x7f,
CTRLC = 'C'-'@',
NSTACKSPERALLOC = 16,
X11STACK= 256*1024
};
char *hosttype = "NetBSD";
static void *stackalloc(Proc *p, void **tos);
static void stackfreeandexit(void *stack);
void executeonnewstack(void *tos, void (*tramp)(void *arg), void *arg);
void unlockandexit(ulong *key);
extern int dflag;
int gidnobody = -1;
int uidnobody = -1;
static struct termios tinit;
void
pexit(char *msg, int t)
{
Osenv *e;
void *kstack;
lock(&procs.l);
if(up->prev)
up->prev->next = up->next;
else
procs.head = up->next;
if(up->next)
up->next->prev = up->prev;
else
procs.tail = up->prev;
unlock(&procs.l);
if(0)
print("pexit: %s: %s\n", up->text, msg);
e = up->env;
if(e != nil) {
closefgrp(e->fgrp);
closepgrp(e->pgrp);
closeegrp(e->egrp);
closesigs(e->sigs);
}
kstack = up->kstack;
free(up->prog);
free(up);
if(kstack != nil)
stackfreeandexit(kstack);
}
int
tramp(void *arg)
{
Proc *p;
p = arg;
p->pid = p->sigid = getpid();
(*p->func)(p->arg);
pexit("{Tramp}", 0);
return 0;
}
void
kproc(char *name, void (*func)(void*), void *arg, int flags)
{
int pid;
Proc *p;
Pgrp *pg;
Fgrp *fg;
Egrp *eg;
void *tos;
p = newproc();
if(0)
print("start %s:%.8lx\n", name, p);
if(p == nil) {
print("kproc(%s): no memory", name);
panic("kproc: no memory");
}
if(flags & KPDUPPG) {
pg = up->env->pgrp;
incref(&pg->r);
p->env->pgrp = pg;
}
if(flags & KPDUPFDG) {
fg = up->env->fgrp;
incref(&fg->r);
p->env->fgrp = fg;
}
if(flags & KPDUPENVG) {
eg = up->env->egrp;
incref(&eg->r);
p->env->egrp = eg;
}
p->env->uid = up->env->uid;
p->env->gid = up->env->gid;
kstrdup(&p->env->user, up->env->user);
strcpy(p->text, name);
p->func = func;
p->arg = arg;
if(flags & KPX11){
p->kstack = nil; /* never freed; also up not defined */
tos = (char*)mallocz(X11STACK, 0) + X11STACK - sizeof(void*);
}else
p->kstack = stackalloc(p, &tos);
lock(&procs.l);
if(procs.tail != nil) {
p->prev = procs.tail;
procs.tail->next = p;
}
else {
procs.head = p;
p->prev = nil;
}
procs.tail = p;
unlock(&procs.l);
if (__clone(tramp, tos, /*CLONE_PTRACE|*/CLONE_VM|CLONE_FS|CLONE_FILES|SIGCHLD, p) <= 0) {
fprint(2, "emu: clone failed: %s\n", strerror(errno));
panic("kproc: clone failed");
}
}
/*
* TO DO:
* To get pc on trap, use sigaction instead of signal and
* examine its siginfo structure
*/
/*
static void
diserr(char *s, int pc)
{
char buf[ERRMAX];
snprint(buf, sizeof(buf), "%s: pc=0x%lux", s, pc);
disfault(nil, buf);
}
*/
static void
trapILL(int signo)
{
USED(signo);
disfault(nil, "Illegal instruction");
}
static void
trapBUS(int signo)
{
USED(signo);
disfault(nil, "Bus error");
}
static void
trapSEGV(int signo)
{
USED(signo);
disfault(nil, "Segmentation violation");
}
static void
trapFPE(int signo)
{
char buf[64];
USED(signo);
snprint(buf, sizeof(buf), "sys: fp: exception status=%.4lux", getfsr());
disfault(nil, buf);
}
static void
trapUSR1(int signo)
{
int intwait;
USED(signo);
intwait = up->intwait;
up->intwait = 0; /* clear it to let proc continue in osleave */
if(up->type != Interp) /* Used to unblock pending I/O */
return;
if(intwait == 0) /* Not posted so it's a sync error */
disfault(nil, Eintr); /* Should never happen */
}
/* called to wake up kproc blocked on a syscall */
void
oshostintr(Proc *p)
{
kill(p->sigid, SIGUSR1);
}
static void
trapUSR2(int signo)
{
USED(signo);
/* we've done our work of interrupting sigsuspend */
}
void
osblock(void)
{
sigset_t mask;
sigprocmask(SIG_SETMASK, NULL, &mask);
sigdelset(&mask, SIGUSR2);
sigsuspend(&mask);
}
void
osready(Proc *p)
{
if(kill(p->sigid, SIGUSR2) < 0)
fprint(2, "emu: osready failed: pid %d: %s\n", p->sigid, strerror(errno));
}
void
oslongjmp(void *regs, osjmpbuf env, int val)
{
USED(regs);
siglongjmp(env, val);
}
static void
termset(void)
{
struct termios t;
tcgetattr(0, &t);
tinit = t;
t.c_lflag &= ~(ICANON|ECHO|ISIG);
t.c_cc[VMIN] = 1;
t.c_cc[VTIME] = 0;
tcsetattr(0, TCSANOW, &t);
}
static void
termrestore(void)
{
tcsetattr(0, TCSANOW, &tinit);
}
void
cleanexit(int x)
{
USED(x);
if(up->intwait) {
up->intwait = 0;
return;
}
if(dflag == 0)
termrestore();
kill(0, SIGKILL);
exit(0);
}
void
osreboot(char *file, char **argv)
{
if(dflag == 0)
termrestore();
execvp(file, argv);
error("reboot failure");
}
void
libinit(char *imod)
{
struct termios t;
struct sigaction act;
sigset_t mask;
struct passwd *pw;
Proc *p;
void *tos;
char sys[64];
setsid();
gethostname(sys, sizeof(sys));
kstrdup(&ossysname, sys);
pw = getpwnam("nobody");
if(pw != nil) {
uidnobody = pw->pw_uid;
gidnobody = pw->pw_gid;
}
if(dflag == 0)
termset();
memset(&act, 0 , sizeof(act));
act.sa_handler = trapUSR1;
sigaction(SIGUSR1, &act, nil);
sigemptyset(&mask);
sigaddset(&mask, SIGUSR2);
sigprocmask(SIG_BLOCK, &mask, NULL);
memset(&act, 0 , sizeof(act));
act.sa_handler = trapUSR2;
sigaction(SIGUSR2, &act, nil);
act.sa_handler = SIG_IGN;
sigaction(SIGCHLD, &act, nil);
/*
* For the correct functioning of devcmd in the
* face of exiting slaves
*/
signal(SIGPIPE, SIG_IGN);
if(signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, cleanexit);
if(signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, cleanexit);
if(sflag == 0) {
act.sa_handler = trapBUS;
sigaction(SIGBUS, &act, nil);
act.sa_handler = trapILL;
sigaction(SIGILL, &act, nil);
act.sa_handler = trapSEGV;
sigaction(SIGSEGV, &act, nil);
act.sa_handler = trapFPE;
sigaction(SIGFPE, &act, nil);
}
p = newproc();
p->kstack = stackalloc(p, &tos);
pw = getpwuid(getuid());
if(pw != nil)
kstrdup(&eve, pw->pw_name);
else
print("cannot getpwuid\n");
p->env->uid = getuid();
p->env->gid = getgid();
executeonnewstack(tos, emuinit, imod);
}
int
readkbd(void)
{
int n;
char buf[1];
n = read(0, buf, sizeof(buf));
if(n < 0)
print("keyboard close (n=%d, %s)\n", n, strerror(errno));
if(n <= 0)
pexit("keyboard thread", 0);
switch(buf[0]) {
case '\r':
buf[0] = '\n';
break;
case DELETE:
buf[0] = 'H' - '@';
break;
case CTRLC:
cleanexit(0);
break;
}
return buf[0];
}
/*
* Return an abitrary millisecond clock time
*/
long
osmillisec(void)
{
static long sec0 = 0, usec0;
struct timeval t;
if(gettimeofday(&t,(struct timezone*)0)<0)
return 0;
if(sec0 == 0) {
sec0 = t.tv_sec;
usec0 = t.tv_usec;
}
return (t.tv_sec-sec0)*1000+(t.tv_usec-usec0+500)/1000;
}
/*
* Return the time since the epoch in nanoseconds and microseconds
* The epoch is defined at 1 Jan 1970
*/
vlong
osnsec(void)
{
struct timeval t;
gettimeofday(&t, nil);
return (vlong)t.tv_sec*1000000000L + t.tv_usec*1000;
}
vlong
osusectime(void)
{
struct timeval t;
gettimeofday(&t, nil);
return (vlong)t.tv_sec * 1000000 + t.tv_usec;
}
int
osmillisleep(ulong milsec)
{
struct timespec time;
time.tv_sec = milsec/1000;
time.tv_nsec= (milsec%1000)*1000000;
nanosleep(&time, NULL);
return 0;
}
int
limbosleep(ulong milsec)
{
return osmillisleep(milsec);
}
void
osyield(void)
{
sched_yield();
}
void
ospause(void)
{
for(;;)
pause();
}
void
oslopri(void)
{
setpriority(PRIO_PROCESS, 0, getpriority(PRIO_PROCESS,0)+4);
}
static struct {
Lock l;
void *free;
} stacklist;
static void
_stackfree(void *stack)
{
*((void **)stack) = stacklist.free;
stacklist.free = stack;
}
static void
stackfreeandexit(void *stack)
{
lock(&stacklist.l);
_stackfree(stack);
unlockandexit(&stacklist.l.val);
}
static void *
stackalloc(Proc *p, void **tos)
{
void *rv;
lock(&stacklist.l);
if (stacklist.free == 0) {
int x;
/*
* obtain some more by using sbrk()
*/
void *more = sbrk(KSTACK * (NSTACKSPERALLOC + 1));
if (more == 0)
panic("stackalloc: no more stacks");
/*
* align to KSTACK
*/
more = (void *)((((unsigned long)more) + (KSTACK - 1)) & ~(KSTACK - 1));
/*
* free all the new stacks onto the freelist
*/
for (x = 0; x < NSTACKSPERALLOC; x++)
_stackfree((char *)more + KSTACK * x);
}
rv = stacklist.free;
stacklist.free = *(void **)rv;
unlock(&stacklist.l);
*tos = rv + KSTACK - sizeof(void *);
*(Proc **)rv = p;
return rv;
}