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/* Copyright (C) 1996 Robert de Bath <rdebath@cix.compulink.co.uk>
* This file is part of the Linux-8086 C library and is distributed
* under the GNU Library General Public License.
*/
#include <sys/types.h>
#include <errno.h>
#include <time.h>
#include <sys/times.h>
/* MSDOS has it's own versions */
#ifndef __MSDOS__
#ifdef __AS386_32__
/********************** Function __cstartup *******************************/
#ifdef L___cstart3
void (*__cleanup)() = 0;
char ** environ;
#asm
loc 2
call_main:
.long _main ! Segment 2 is the trailing pointers, main and the
.long call_exit ! routine to call exit.
#if __FIRST_ARG_IN_AX__
.data
saved_arg1:
.long 0
#endif
.data
loop_safe:
.long 0
.text
export ___mkargv
___mkargv: ! BCC Tells linker to init argv ... none needed.
export ___cstartup
___cstartup: ! Crt0 startup (Linux style)
mov eax,[esp]
test eax,eax
jz call_exit ! If argc == 0 this is being called by ldd, exit.
mov eax,[esp+8]
mov [_environ],eax
#if __FIRST_ARG_IN_AX__
pop [saved_arg1] ! Argc will go into eax
#endif
mov ebx,#auto_start ! Pointer to first autostart function
auto_run:
#if __FIRST_ARG_IN_AX__
mov eax,[saved_arg1]
#endif
mov [loop_safe],ebx
mov ebx,[ebx]
test ebx,ebx
jz no_func
call ebx ! Call the function
no_func:
mov ebx,[loop_safe]
add ebx,#4 ! next
jmp auto_run ! And round for the next.
call_exit: ! Last item called by above.
pop ebx ! Be tidy.
#if !__FIRST_ARG_IN_AX__
push eax ! At the end the last called was main() push it`s
#endif
call _exit ! return val and call exit();
bad_exit:
jmp bad_exit ! Exit returned !!
export _exit
export __exit
_exit: ! exit(rv) function
#if __FIRST_ARG_IN_AX__
mov [saved_arg1],eax
#else
push [esp+4] ! Copy the `rv` for the exit fuctions.
#endif
mov ebx,[___cleanup] ! Call exit, normally this is `__do_exit`
test ebx,ebx
je no_clean ! But it`s default is null
call ebx
no_clean:
#if __FIRST_ARG_IN_AX__
mov eax,[saved_arg1]
#else
add esp,#4
#endif
__exit: ! _exit(rv)
br ___exit ! This is just an alias for __exit();
#endasm
#endif
/********************** Function time ************************************/
#ifdef L_time
time_t time(where)
time_t *where;
{
struct timeval rv;
if( gettimeofday(&rv, (void*)0) < 0 ) return -1;
if(where) *where = rv.tv_sec;
return rv.tv_sec;
}
#endif
/********************** Function abort ************************************/
#ifdef L_abort
#include <signal.h>
int abort()
{
signal(SIGABRT, SIG_DFL);
kill(SIGABRT, getpid()); /* Correct one */
pause(); /* System may just schedule */
signal(SIGKILL, SIG_DFL);
kill(SIGKILL, getpid()); /* Can't trap this! */
__exit(255); /* WHAT!! */
}
#endif
/********************** Function wait ************************************/
#ifdef L_wait
int
wait(status)
int * status;
{
return wait4(-1, status, 0, (void*)0);
}
#endif
/********************** Function wait3 **************************************/
#ifdef L_wait3
int
wait3(status, opts, usage)
int * status;
int opts;
struct rusage * usage;
{
return wait4(-1, status, opts, usage);
}
#endif
/********************** Function waitpid ************************************/
#ifdef L_waitpid
int
waitpid(pid, status, opts)
int pid;
int * status;
int opts;
{
return wait4(pid, status, opts, (void*)0);
}
#endif
/********************** Function killpg ************************************/
#ifdef L_killpg
int
killpg(pid, sig)
int pid;
int sig;
{
if(pid == 0)
pid = getpgrp();
if(pid > 1)
return kill(-pid, sig);
errno = EINVAL;
return -1;
}
#endif
/********************** Function setpgrp ************************************/
#ifdef L_setpgrp
int
setpgrp()
{
return setpgid(0,0);
}
#endif
/********************** Function sleep ************************************/
#ifdef L_sleep
#include <signal.h>
/* This uses SIGALRM, it does keep the previous alarm call but will lose
* any alarms that go off during the sleep
*/
static void alrm() { }
unsigned int sleep(seconds)
unsigned int seconds;
{
void (*last_alarm)();
unsigned int prev_sec;
prev_sec = alarm(0);
if( prev_sec <= seconds ) prev_sec = 1; else prev_sec -= seconds;
last_alarm = signal(SIGALRM, alrm);
alarm(seconds);
pause();
seconds = alarm(prev_sec);
signal(SIGALRM, last_alarm);
return seconds;
}
#if 0
/* Is this a better way ? If we have select of course :-) */
#include <sys/time.h>
unsigned int
sleep(seconds)
unsigned int seconds;
{
struct timeval timeout;
time_t start = time((void*)0);
timeout.tv_sec = seconds;
timeout.tv_usec = 0;
select(1, NULL, NULL, NULL, &timeout);
return seconds - (time((void*)0) - start);
}
#endif
#endif
/********************** Function usleep ************************************/
#ifdef L_usleep
#include <sys/time.h>
void
usleep(useconds)
unsigned long useconds;
{
struct timeval timeout;
timeout.tv_sec = useconds%1000000L;
timeout.tv_usec = useconds/1000000L;
select(1, NULL, NULL, NULL, &timeout);
}
#endif
/********************** THE END ********************************************/
#endif /* __MSDOS__ */
#endif
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