/* * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) * Licensed under the GPL */ #include "linux/sched.h"#include "linux/file.h"#include "linux/smp_lock.h"#include "linux/mm.h"#include "linux/utsname.h"#include "linux/msg.h"#include "linux/shm.h"#include "linux/sys.h"#include "linux/syscalls.h"#include "linux/unistd.h"#include "linux/slab.h"#include "linux/utime.h"#include "asm/mman.h"#include "asm/uaccess.h"#include "kern_util.h"#include "user_util.h"#include "sysdep/syscalls.h"#include "mode_kern.h"#include "choose-mode.h" /*  Unlocked, I don't care if this is a bit off */int nsyscalls = 0; long sys_fork(void){	long ret; 	current->thread.forking = 1;	ret = do_fork(SIGCHLD, UPT_SP(&current->thread.regs.regs),		      &current->thread.regs, 0, NULL, NULL);	current->thread.forking = 0;	return(ret);} long sys_vfork(void){	long ret; 	current->thread.forking = 1;	ret = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,		      UPT_SP(&current->thread.regs.regs),		      &current->thread.regs, 0, NULL, NULL);	current->thread.forking = 0;	return(ret);} /* common code for old and new mmaps */long sys_mmap2(unsigned long addr, unsigned long len,	       unsigned long prot, unsigned long flags,	       unsigned long fd, unsigned long pgoff){	long error = -EBADF;	struct file * file = NULL; 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);	if (!(flags & MAP_ANONYMOUS)) {		file = fget(fd);		if (!file)			goto out;	} 	down_write(&current->mm->mmap_sem);	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);	up_write(&current->mm->mmap_sem); 	if (file)		fput(file); out:	return error;} long old_mmap(unsigned long addr, unsigned long len,	      unsigned long prot, unsigned long flags,	      unsigned long fd, unsigned long offset){	long err = -EINVAL;	if (offset & ~PAGE_MASK)		goto out; 	err = sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); out:	return err;}/* * sys_pipe() is the normal C calling standard for creating * a pipe. It's not the way unix traditionally does this, though. */long sys_pipe(unsigned long __user * fildes){        int fd[2];        long error;         error = do_pipe(fd);        if (!error) {		if (copy_to_user(fildes, fd, sizeof(fd)))                        error = -EFAULT;        }        return error;}  long sys_uname(struct old_utsname __user * name){	long err;	if (!name)		return -EFAULT;	down_read(&uts_sem);	err = copy_to_user(name, utsname(), sizeof (*name));	up_read(&uts_sem);	return err?-EFAULT:0;} long sys_olduname(struct oldold_utsname __user * name){	long error; 	if (!name)		return -EFAULT;	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))		return -EFAULT;   	down_read(&uts_sem); 	error = __copy_to_user(&name->sysname, &utsname()->sysname,			       __OLD_UTS_LEN);	error |= __put_user(0, name->sysname + __OLD_UTS_LEN);	error |= __copy_to_user(&name->nodename, &utsname()->nodename,				__OLD_UTS_LEN);	error |= __put_user(0, name->nodename + __OLD_UTS_LEN);	error |= __copy_to_user(&name->release, &utsname()->release,				__OLD_UTS_LEN);	error |= __put_user(0, name->release + __OLD_UTS_LEN);	error |= __copy_to_user(&name->version, &utsname()->version,				__OLD_UTS_LEN);	error |= __put_user(0, name->version + __OLD_UTS_LEN);	error |= __copy_to_user(&name->machine, &utsname()->machine,				__OLD_UTS_LEN);	error |= __put_user(0, name->machine + __OLD_UTS_LEN); 	up_read(&uts_sem); 	error = error ? -EFAULT : 0; 	return error;} int kernel_execve(const char *filename, char *const argv[], char *const envp[]){	mm_segment_t fs;	int ret; 	fs = get_fs();	set_fs(KERNEL_DS);	ret = um_execve(filename, argv, envp);	set_fs(fs); 	return ret;}