2 * linux/arch/i386/kernel/sys_i386.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/i386
9 #include <linux/errno.h>
10 #include <linux/sched.h>
12 #include <linux/smp.h>
13 #include <linux/smp_lock.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/mman.h>
19 #include <linux/file.h>
20 #include <linux/utsname.h>
22 #include <asm/uaccess.h>
26 * sys_pipe() is the normal C calling standard for creating
27 * a pipe. It's not the way Unix traditionally does this, though.
29 asmlinkage int sys_pipe(unsigned long * fildes)
36 if (copy_to_user(fildes, fd, 2*sizeof(int)))
42 /* common code for old and new mmaps */
43 static inline long do_mmap2(
44 unsigned long addr, unsigned long len,
45 unsigned long prot, unsigned long flags,
46 unsigned long fd, unsigned long pgoff)
49 struct file * file = NULL;
51 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
52 if (!(flags & MAP_ANONYMOUS)) {
58 down_write(¤t->mm->mmap_sem);
59 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
60 up_write(¤t->mm->mmap_sem);
68 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
69 unsigned long prot, unsigned long flags,
70 unsigned long fd, unsigned long pgoff)
72 return do_mmap2(addr, len, prot, flags, fd, pgoff);
76 * Perform the select(nd, in, out, ex, tv) and mmap() system
77 * calls. Linux/i386 didn't use to be able to handle more than
78 * 4 system call parameters, so these system calls used a memory
79 * block for parameter passing..
82 struct mmap_arg_struct {
91 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
93 struct mmap_arg_struct a;
96 if (copy_from_user(&a, arg, sizeof(a)))
100 if (a.offset & ~PAGE_MASK)
103 err = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
109 extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
111 struct sel_arg_struct {
113 fd_set *inp, *outp, *exp;
117 asmlinkage int old_select(struct sel_arg_struct *arg)
119 struct sel_arg_struct a;
121 if (copy_from_user(&a, arg, sizeof(a)))
123 /* sys_select() does the appropriate kernel locking */
124 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
128 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
130 * This is really horribly ugly.
132 asmlinkage int sys_ipc (uint call, int first, int second,
133 int third, void *ptr, long fifth)
137 version = call >> 16; /* hack for backward compatibility */
142 return sys_semtimedop (first, (struct sembuf *)ptr, second, NULL);
144 return sys_semtimedop (first, (struct sembuf *)ptr, second,
145 (const struct timespec *)fifth);
147 return sys_semget (first, second, third);
152 if (get_user(fourth.__pad, (void **) ptr))
154 return sys_semctl (first, second, third, fourth);
158 return sys_msgsnd (first, (struct msgbuf *) ptr,
163 struct ipc_kludge tmp;
167 if (copy_from_user(&tmp,
168 (struct ipc_kludge *) ptr,
171 return sys_msgrcv (first, tmp.msgp, second,
175 return sys_msgrcv (first,
176 (struct msgbuf *) ptr,
177 second, fifth, third);
180 return sys_msgget ((key_t) first, second);
182 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
188 ret = sys_shmat (first, (char *) ptr, second, &raddr);
191 return put_user (raddr, (ulong *) third);
193 case 1: /* iBCS2 emulator entry point */
194 if (!segment_eq(get_fs(), get_ds()))
196 return sys_shmat (first, (char *) ptr, second, (ulong *) third);
199 return sys_shmdt ((char *)ptr);
201 return sys_shmget (first, second, third);
203 return sys_shmctl (first, second,
204 (struct shmid_ds *) ptr);
213 asmlinkage int sys_uname(struct old_utsname * name)
219 err=copy_to_user(name, &system_utsname, sizeof (*name));
221 return err?-EFAULT:0;
224 asmlinkage int sys_olduname(struct oldold_utsname * name)
230 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
235 error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
236 error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
237 error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
238 error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
239 error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
240 error |= __put_user(0,name->release+__OLD_UTS_LEN);
241 error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
242 error |= __put_user(0,name->version+__OLD_UTS_LEN);
243 error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
244 error |= __put_user(0,name->machine+__OLD_UTS_LEN);
248 error = error ? -EFAULT : 0;
253 asmlinkage int sys_pause(void)
255 current->state = TASK_INTERRUPTIBLE;
257 return -ERESTARTNOHAND;