/*
* 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.
*/
29 asmlinkage int sys_pipe(unsigned long * fildes)
{
int fd[2];
int error;
error = do_pipe(fd);
35 if (!error) {
36 if (copy_to_user(fildes, fd, 2*sizeof(int)))
error = -EFAULT;
}
39 return error;
}
/* common code for old and new mmaps */
43 static inline long do_mmap2(
unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
int error = -EBADF;
struct file * file = NULL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
52 if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
54 if (!file)
55 goto out;
}
down(¤t->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
up(¤t->mm->mmap_sem);
62 if (file)
fput(file);
out:
65 return error;
}
68 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
72 return do_mmap2(addr, len, prot, flags, fd, pgoff);
}
/*
* 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;
};
91 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
struct mmap_arg_struct a;
int err = -EFAULT;
96 if (copy_from_user(&a, arg, sizeof(a)))
97 goto out;
err = -EINVAL;
100 if (a.offset & ~PAGE_MASK)
101 goto out;
err = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
105 return err;
}
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;
};
117 asmlinkage int old_select(struct sel_arg_struct *arg)
{
struct sel_arg_struct a;
121 if (copy_from_user(&a, arg, sizeof(a)))
122 return -EFAULT;
/* sys_select() does the appropriate kernel locking */
124 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.
*/
132 asmlinkage int sys_ipc (uint call, int first, int second,
int third, void *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
140 switch (call) {
141 case SEMOP:
142 return sys_semop (first, (struct sembuf *)ptr, second);
143 case SEMGET:
144 return sys_semget (first, second, third);
145 case SEMCTL: {
union semun fourth;
147 if (!ptr)
148 return -EINVAL;
149 if (get_user(fourth.__pad, (void **) ptr))
150 return -EFAULT;
151 return sys_semctl (first, second, third, fourth);
}
154 case MSGSND:
return sys_msgsnd (first, (struct msgbuf *) ptr,
156 second, third);
157 case MSGRCV:
158 switch (version) {
159 case 0: {
struct ipc_kludge tmp;
161 if (!ptr)
162 return -EINVAL;
if (copy_from_user(&tmp,
(struct ipc_kludge *) ptr,
166 sizeof (tmp)))
167 return -EFAULT;
return sys_msgrcv (first, tmp.msgp, second,
169 tmp.msgtyp, third);
}
171 default:
return sys_msgrcv (first,
(struct msgbuf *) ptr,
174 second, fifth, third);
}
176 case MSGGET:
177 return sys_msgget ((key_t) first, second);
178 case MSGCTL:
179 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
181 case SHMAT:
182 switch (version) {
183 default: {
ulong raddr;
ret = sys_shmat (first, (char *) ptr, second, &raddr);
186 if (ret)
187 return ret;
188 return put_user (raddr, (ulong *) third);
}
190 case 1: /* iBCS2 emulator entry point */
191 if (!segment_eq(get_fs(), get_ds()))
192 return -EINVAL;
193 return sys_shmat (first, (char *) ptr, second, (ulong *) third);
}
195 case SHMDT:
196 return sys_shmdt ((char *)ptr);
197 case SHMGET:
198 return sys_shmget (first, second, third);
199 case SHMCTL:
return sys_shmctl (first, second,
201 (struct shmid_ds *) ptr);
202 default:
203 return -EINVAL;
}
}
/*
* Old cruft
*/
210 asmlinkage int sys_uname(struct old_utsname * name)
{
int err;
213 if (!name)
214 return -EFAULT;
down_read(&uts_sem);
err=copy_to_user(name, &system_utsname, sizeof (*name));
up_read(&uts_sem);
218 return err?-EFAULT:0;
}
221 asmlinkage int sys_olduname(struct oldold_utsname * name)
{
int error;
225 if (!name)
226 return -EFAULT;
227 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
228 return -EFAULT;
down_read(&uts_sem);
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);
up_read(&uts_sem);
error = error ? -EFAULT : 0;
247 return error;
}
250 asmlinkage int sys_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
254 return -ERESTARTNOHAND;
}