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dosmod protocol revision 3, featuring MPROTECT and ENTERIDLE.

This commit is contained in:
Ove Kaaven 2000-01-30 02:53:56 +00:00 committed by Alexandre Julliard
parent b10e912936
commit 43b2ad1973
2 changed files with 86 additions and 23 deletions
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97
loader/dos/dosmod.c
View File

@ -150,11 +150,38 @@ void cb_handler(int sig)
signal(sig,cb_handler);
}
int send_signal(void)
{
int ret=sig_pend; sig_pend=0;
if (!ret) {
if (sig_alrm) {
ret=SIGALRM; sig_alrm--;
} else {
ret=SIGUSR2; sig_cb--;
}
}
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
if (sig_fatal) return 1;
return 0;
}
int send_enter_reply(int ret)
{
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
if (XWRITE(1,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
switch (ret&0xff) {
case DOSMOD_SIGNAL:
return send_signal();
}
return 0;
}
int main(int argc,char**argv)
{
int mfd=open(argv[0],O_RDWR);
struct timeval tim;
int func,ret;
mprot_info mpr;
int func,ret,idle;
off_t fofs=0;
pid_t ppid=getppid();
@ -200,43 +227,69 @@ int main(int argc,char**argv)
set_timer(&tim);
#endif
/* report back to the main program that we're ready */
ret=2; /* dosmod protocol revision */
ret=3; /* dosmod protocol revision */
XWRITE(1,&ret,sizeof(ret));
/* context exchange loop */
idle=0;
do {
if (XREAD(0,&func,sizeof(func))!=sizeof(func)) return 1;
if (idle) {
while (1) {
int res;
/* parent is idle, transmit any signals (particularly SIGALRM) */
if (sig_pend||sig_alrm||sig_cb) {
ret=DOSMOD_SIGNAL;
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
ret=send_signal();
if (ret) return ret;
break;
}
res = read(0,&func,sizeof(func));
if (res==sizeof(func))
break;
if (res==-1) {
if (errno==EINTR)
continue;
perror("dosmod read");
return 1;
}
if (res) /* don't print the EOF condition */
fprintf(stderr,"dosmod read only %d of %d bytes.\n",res,sizeof(func));
return 1;
}
ret=DOSMOD_LEFTIDLE;
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
idle--;
} else
if (XREAD(0,&func,sizeof(func))!=sizeof(func)) return 1;
if (func<0) break;
switch (func) {
case DOSMOD_SET_TIMER:
case DOSMOD_SET_TIMER: /* rev 1 */
if (XREAD(0,&tim,sizeof(tim))!=sizeof(tim)) return 1;
set_timer(&tim);
/* no response */
break;
case DOSMOD_GET_TIMER:
case DOSMOD_GET_TIMER: /* rev 1 */
get_timer(&tim);
if (XWRITE(1,&tim,sizeof(tim))!=sizeof(tim)) return 1;
break;
case DOSMOD_ENTER:
case DOSMOD_MPROTECT: /* rev 3 */
if (XREAD(0,&mpr,sizeof(mpr))!=sizeof(mpr)) return 1;
mprotect(mpr.addr,mpr.len,mpr.prot);
/* no response */
break;
case DOSMOD_ENTERIDLE: /* rev 3 */
idle++;
break;
case DOSMOD_LEAVEIDLE: /* rev 3 */
break;
case DOSMOD_ENTER: /* rev 0 */
default:
if (XREAD(0,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
if (sig_pend||sig_alrm||sig_cb) ret=DOSMOD_SIGNAL; else
ret=vm86plus(func,&VM86);
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
if (XWRITE(1,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
switch (ret&0xff) {
case DOSMOD_SIGNAL:
ret=sig_pend; sig_pend=0;
if (!ret) {
if (sig_alrm) {
ret=SIGALRM; sig_alrm--;
} else {
ret=SIGUSR2; sig_cb--;
}
}
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
if (sig_fatal) return 1;
break;
}
ret=send_enter_reply(ret);
if (ret) return ret;
}
} while (1);
return 0;

12
loader/dos/dosmod.h
View File

@ -4,7 +4,17 @@
#define DOSMOD_ENTER 0x01 /* VM86_ENTER */
#define DOSMOD_SET_TIMER 0x10
#define DOSMOD_GET_TIMER 0x11
#define DOSMOD_MPROTECT 0x12
#define DOSMOD_ENTERIDLE 0x13
#define DOSMOD_LEAVEIDLE 0x14
#define DOSMOD_SIGNAL 0x00 /* VM86_SIGNAL */
#define DOSMOD_SIGNAL 0x00 /* VM86_SIGNAL */
#define DOSMOD_LEFTIDLE 0x10
typedef struct {
void *addr;
size_t len;
int prot;
} mprot_info;
#endif