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/*
* linux/arch/i386/kernel/sys_i386.c
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/i386
* platform.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
asmlinkage int sys_pipe(unsigned long * fildes)
{
int fd[2];
int error;
lock_kernel();
error = do_pipe(fd);
unlock_kernel();
if (!error) {
if (copy_to_user(fildes, fd, 2*sizeof(int)))
error = -EFAULT;
}
return error;
}
/*
* Perform the select(nd, in, out, ex, tv) and mmap() system
* calls. Linux/i386 didn't use to be able to handle more than
* 4 system call parameters, so these system calls used a memory
* block for parameter passing..
*/
struct mmap_arg_struct {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
int error = -EFAULT;
struct file * file = NULL;
struct mmap_arg_struct a;
lock_kernel();
if (copy_from_user(&a, arg, sizeof(a)))
goto out;
if (!(a.flags & MAP_ANONYMOUS)) {
error = -EBADF;
if (a.fd >= NR_OPEN || !(file = current->files->fd[a.fd]))
goto out;
}
a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
error = do_mmap(file, a.addr, a.len, a.prot, a.flags, a.offset);
out:
unlock_kernel();
return error;
}
extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
struct sel_arg_struct {
unsigned long n;
fd_set *inp, *outp, *exp;
struct timeval *tvp;
};
asmlinkage int old_select(struct sel_arg_struct *arg)
{
struct sel_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
/* sys_select() does the appropriate kernel locking */
return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
lock_kernel();
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
if (call <= SEMCTL)
switch (call) {
case SEMOP:
ret = sys_semop (first, (struct sembuf *)ptr, second);
goto out;
case SEMGET:
ret = sys_semget (first, second, third);
goto out;
case SEMCTL: {
union semun fourth;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (get_user(fourth.__pad, (void **) ptr))
goto out;
ret = sys_semctl (first, second, third, fourth);
goto out;
}
default:
ret = -EINVAL;
goto out;
}
if (call <= MSGCTL)
switch (call) {
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf *) ptr,
second, third);
goto out;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
sizeof (tmp)))
goto out;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
goto out;
}
case 1: default:
ret = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
goto out;
}
case MSGGET:
ret = sys_msgget ((key_t) first, second);
goto out;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
if (call <= SHMCTL)
switch (call) {
case SHMAT:
switch (version) {
case 0: default: {
ulong raddr;
ret = sys_shmat (first, (char *) ptr, second, &raddr);
if (ret)
goto out;
ret = put_user (raddr, (ulong *) third);
goto out;
}
case 1: /* iBCS2 emulator entry point */
ret = -EINVAL;
if (get_fs() != get_ds())
goto out;
ret = sys_shmat (first, (char *) ptr, second, (ulong *) third);
goto out;
}
case SHMDT:
ret = sys_shmdt ((char *)ptr);
goto out;
case SHMGET:
ret = sys_shmget (first, second, third);
goto out;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
else
ret = -EINVAL;
out:
unlock_kernel();
return ret;
}
/*
* Old cruft
*/
asmlinkage int sys_uname(struct old_utsname * name)
{
if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
return 0;
return -EFAULT;
}
asmlinkage int sys_olduname(struct oldold_utsname * name)
{
int error;
if (!name)
return -EFAULT;
if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
return -EFAULT;
error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
error -= __put_user(0,name->release+__OLD_UTS_LEN);
error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
error -= __put_user(0,name->version+__OLD_UTS_LEN);
error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
error = __put_user(0,name->machine+__OLD_UTS_LEN);
error = error ? -EFAULT : 0;
return error;
}
asmlinkage int sys_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
return -ERESTARTNOHAND;
}
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