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/* Copyright (C) 1995,1996 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_16__
/********************** Function __cstartup *******************************/
#ifdef L___cstartup
void (*__cleanup)() = 0;
char ** environ;
#asm
loc 2
call_main:
.word _main ! Segment 2 is the trailing pointers, main and the
.word call_exit ! routine to call exit.
#if __FIRST_ARG_IN_AX__
.data
saved_arg1:
.word 0
#endif
#if __CALLER_SAVES__
.data
loopy_safe:
.word 0
#endif
.text
export ___cstartup
___cstartup: ! Crt0 startup
pop cx ! Argc
mov bx,sp ! Calculate ptrs to argv and envp
mov ax,cx
inc ax
shl ax,#1
add ax,bx
export ___mkargv
___mkargv: ! BCC tells the linker to init argc,argv with this.
push ax ! Push Envp
mov [_environ],ax ! And save
push bx ! Push argv
#if __FIRST_ARG_IN_AX__
mov [saved_arg1],cx
#else
push cx ! Push argc
#endif
mov si,#auto_start ! Pointer to first autostart function
auto_run:
#if __FIRST_ARG_IN_AX__
mov ax,[saved_arg1]
#endif
#if __CALLER_SAVES__
mov [loopy_safe],si
#endif
mov bx,[si]
test bx,bx
jz no_entry
call bx ! Call the function
no_entry:
#if __CALLER_SAVES__
mov si,[loopy_safe]
#endif
inc si ! SI at next
inc si
jmp auto_run ! And round for the next.
call_exit: ! Last item called by above.
pop bx ! Be tidy.
#if !__FIRST_ARG_IN_AX__
push ax ! 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],ax
#else
mov bx,sp
push [bx+2] ! Copy the `rv` for the exit fuctions.
#endif
mov bx,[___cleanup] ! Call exit, normally this is `__do_exit`
test bx,bx
je no_clean ! But it`s default is null
call bx
no_clean:
#if __FIRST_ARG_IN_AX__
mov ax,[saved_arg1]
#else
inc sp
inc sp
#endif
__exit: ! _exit(rv)
br ___exit ! This is just an alias for __exit();
#endasm
#endif
/********************** Function lseek ************************************/
#ifdef L_lseek
off_t lseek(fd, posn, where)
int fd;
off_t posn;
int where;
{
if( __lseek(fd, &posn, where) < 0 ) return -1;
else return posn;
}
#endif
/********************** Function getpid ************************************/
#ifdef L_getpid
int getpid()
{
int ppid;
return __getpid(&ppid);
}
#endif
/********************** Function getppid ************************************/
#ifdef L_getppid
int getppid()
{
int ppid;
__getpid(&ppid);
return ppid;
}
#endif
/********************** Function getuid ************************************/
#ifdef L_getuid
int getuid()
{
int euid;
return __getuid(&euid);
}
#endif
/********************** Function geteuid ************************************/
#ifdef L_geteuid
int geteuid()
{
int euid;
__getuid(&euid);
return euid;
}
#endif
/********************** Function getgid ************************************/
#ifdef L_getgid
int getgid()
{
int egid;
return __getgid(&egid);
}
#endif
/********************** Function getegid ************************************/
#ifdef L_getegid
int getegid()
{
int egid;
__getgid(&egid);
return egid;
}
#endif
/********************** Function dup2 ************************************/
#ifdef L_dup2
#include <fcntl.h>
int dup2(ifd, ofd)
int ifd;
{
return fcntl(ifd, F_DUPFD, ofd);
}
#endif
/********************** Function dup ************************************/
#ifdef L_dup
#include <sys/param.h>
#include <fcntl.h>
#include <errno.h>
/* This is horribly complicated, there _must_ be a better way! */
int
dup(fd)
int fd;
{
int nfd;
extern int errno;
int oerr = errno;
errno = 0;
for(nfd=0; nfd<NR_OPEN; nfd++)
{
if( fcntl(nfd, F_GETFD) < 0 )
break;
}
if( nfd == NR_OPEN ) { errno = EMFILE ; return -1; }
errno = oerr;
if( fcntl(fd, F_DUPFD, nfd) < 0 )
{
if( errno == EINVAL ) errno = EMFILE;
return -1;
}
return nfd;
}
#endif
/********************** Function getpgrp ************************************/
#ifdef L_getpgrp
int
getpgrp()
{
return getpgid(0);
}
#endif
/********************** Function times ************************************/
#ifdef L_times
clock_t times(buf)
struct tms* buf;
{
long rv;
__times(buf, &rv);
return rv;
}
#endif
/********************** THE END ********************************************/
#endif /* __AS386_16__ */
#endif /* __MSDOS__ */
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