diff options
Diffstat (limited to 'libc/syscall/syslib0.c')
| -rw-r--r-- | libc/syscall/syslib0.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/libc/syscall/syslib0.c b/libc/syscall/syslib0.c new file mode 100644 index 0000000..98f59e6 --- /dev/null +++ b/libc/syscall/syslib0.c @@ -0,0 +1,264 @@ +/* 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__ */ |