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