ref: a5cb451b299b03f44154fac5780b6a57ca130ce0
dir: /emu/Irix/os.c/
/* Link with -lfpe. See man pages for fpc
* and /usr/include/sigfpe.h, sys/fpu.h.
*/
#include "dat.h"
#include "fns.h"
#include "error.h"
#include <time.h>
#include <ulocks.h>
#include <termios.h>
#include <sigfpe.h>
#include <sys/prctl.h>
#include <sys/fpu.h>
#include <sys/cachectl.h>
#undef _POSIX_SOURCE /* SGI incompetence */
#include <signal.h>
#define _BSD_TIME
/* for gettimeofday(), which isn't POSIX,
* but is fairly common
*/
#include <sys/time.h>
#define _POSIX_SOURCE
#include <pwd.h>
extern int rebootargc;
extern char** rebootargv;
int gidnobody = -1;
int uidnobody = -1;
Proc** Xup;
#define MAXSPROC 30000 /* max procs == MAXPID */
static int sproctbl[MAXSPROC];
enum
{
KSTACK = 64*1024,
DELETE = 0x7F
};
char *hosttype = "Irix";
char *cputype = "mips";
extern int dflag;
void
pexit(char *msg, int t)
{
Osenv *e;
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;
sproctbl[getpid()] = -1;
unlock(&procs.l);
/* 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);
}
free(up->prog);
free(up);
exit(0);
}
static void
tramp(void *p, size_t stacksz)
{
up = p;
up->sigid = getpid();
up->func(up->arg);
pexit("", 0);
}
void
kproc(char *name, void (*func)(void*), void *arg, int flags)
{
Proc *p;
Pgrp *pg;
Fgrp *fg;
Egrp *eg;
int pid;
int id;
int i;
p = newproc();
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;
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;
for(i = 1; i < MAXSPROC; i++) {
if(sproctbl[i] == -1) {
break;
}
}
if(i==MAXSPROC)
return -1;
sproctbl[i] = -i - 1; /* temporary hold of table index outside of lock */
unlock(&procs.l);
pid = sprocsp(tramp, PR_SALL, p, 0, KSTACK);
if(pid >= 0)
sproctbl[i] = pid;
else
sproctbl[i] = -1;
}
void
osblock(void)
{
blockproc(up->sigid);
}
void
osready(Proc *p)
{
unblockproc(p->sigid);
}
void
trapUSR1(void)
{
int intwait;
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 */
}
void
trapILL(void)
{
disfault(nil, "Illegal instruction");
}
void
trapBUS(void)
{
disfault(nil, "Bus error");
}
void
trapSEGV(void)
{
disfault(nil, "Segmentation violation");
}
/*
* This is not a signal handler but rather a vector from real/FPcontrol-Irix.c
*/
void
trapFPE(unsigned exception[5], int value[2])
{
disfault(nil, "Floating point exception");
}
void
oshostintr(Proc *p)
{
kill(p->sigid, SIGUSR1);
}
void
oslongjmp(void *regs, osjmpbuf env, int val)
{
USED(regs);
siglongjmp(env, val);
}
static struct termios tinit;
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);
/* if(sproctbl[0] < 0)
panic("corrupt sproc tbl");
kill(sproctbl[0], SIGUSR2);
sginap(10000); */
}
void
trapUSR2(void)
{
int i;
for(i = MAXSPROC - 1; i > 0; i--) {
if(sproctbl[i] != -1)
kill(sproctbl[i], SIGKILL);
sproctbl[i] = -1;
}
execvp(rebootargv[0], rebootargv);
panic("reboot failure");
}
void
cleanexit(int x)
{
USED(x);
if(up->intwait) {
up->intwait = 0;
return;
}
if(dflag == 0)
termrestore();
kill(0, SIGKILL);
exit(0);
}
void
getnobody(void)
{
struct passwd *pwd;
pwd = getpwnam("nobody");
if(pwd != nil) {
uidnobody = pwd->pw_uid;
gidnobody = pwd->pw_gid;
}
}
void
osreboot(char *file, char **argv)
{
if(dflag == 0)
termrestore();
execvp(file, argv);
panic("reboot failure");
}
void
libinit(char *imod)
{
struct sigaction act;
struct passwd *pw;
int i;
char sys[64];
setsid();
for(i=0; i<MAXSPROC; i++)
sproctbl[i] = -1;
sproctbl[0] = getpid();
gethostname(sys, sizeof(sys));
kstrdup(&ossysname, sys);
if(dflag == 0)
termset();
if(signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, cleanexit);
if(signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, cleanexit);
signal(SIGUSR2, trapUSR2);
/* For the correct functioning of devcmd in the
* face of exiting slaves
*/
signal(SIGCLD, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
memset(&act, 0 , sizeof(act));
act.sa_handler=trapUSR1;
sigaction(SIGUSR1, &act, nil);
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);
}
if(usconfig(CONF_INITUSERS, 1000) < 0)
panic("usconfig");
Xup = (Proc**)PRDA->usr_prda.fill;
up = newproc();
pw = getpwuid(getuid());
if(pw != nil) {
if (strlen(pw->pw_name) + 1 <= KNAMELEN)
strcpy(eve, pw->pw_name);
else
print("pw_name too long\n");
}
else
print("cannot getpwuid\n");
/* after setting up, since this takes locks */
getnobody();
up->env->uid = getuid();
up->env->gid = getgid();
emuinit(imod);
}
int
readkbd(void)
{
int n;
char buf[1];
n = read(0, buf, sizeof(buf));
if(n < 0)
fprint(2, "keyboard read error: %s\n", strerror(errno));
if(n <= 0)
pexit("keyboard thread", 0);
switch(buf[0]) {
case '\r':
buf[0] = '\n';
break;
case DELETE:
cleanexit(0);
break;
}
return buf[0];
}
int
segflush(void *a, ulong n)
{
cacheflush(a, n, BCACHE);
return 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)
{
static int tick;
/*
* Posix-conforming CLK_TCK implementations tend to call sysconf,
* and we don't need the overhead.
*/
if(tick == 0)
tick = CLK_TCK;
sginap((tick*milsec)/1000);
return 0;
}
int
limbosleep(ulong milsec)
{
return osmillisleep(milsec);
}
void
osyield(void)
{
sginap(0);
}
void
ospause(void)
{
for(;;)
pause();
}
void
oslopri(void)
{
nice(2);
}