/* * 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/syscalls.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 __user * fildes) { int fd[2]; int error; error = do_pipe(fd); if (!error) { if (copy_to_user(fildes, fd, 2*sizeof(int))) error = -EFAULT; } return error; } /* common code for old and new mmaps */ 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); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { 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; }; asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) { struct mmap_arg_struct a; int err = -EFAULT; if (copy_from_user(&a, arg, sizeof(a))) goto out; err = -EINVAL; if (a.offset & ~PAGE_MASK) goto out; err = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); out: return err; } struct sel_arg_struct { unsigned long n; fd_set __user *inp, *outp, *exp; struct timeval __user *tvp; }; asmlinkage int old_select(struct sel_arg_struct __user *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 __user *ptr, long fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget (first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void __user * __user *) ptr)) return -EFAULT; return sys_semctl (first, second, third, fourth); } case MSGSND: return sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) return -EFAULT; return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv (first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget ((key_t) first, second); case MSGCTL: return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); case SHMAT: switch (version) { default: { ulong raddr; ret = do_shmat (first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user (raddr, (ulong __user *) third); } case 1: /* iBCS2 emulator entry point */ if (!segment_eq(get_fs(), get_ds())) return -EINVAL; /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */ return do_shmat (first, (char __user *) ptr, second, (ulong *) third); } case SHMDT: return sys_shmdt ((char __user *)ptr); case SHMGET: return sys_shmget (first, second, third); case SHMCTL: return sys_shmctl (first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; } } /* * Old cruft */ asmlinkage int sys_uname(struct old_utsname __user * name) { int err; if (!name) return -EFAULT; down_read(&uts_sem); err=copy_to_user(name, &system_utsname, sizeof (*name)); up_read(&uts_sem); return err?-EFAULT:0; } asmlinkage int sys_olduname(struct oldold_utsname __user * name) { int 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,&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; return error; }