/* * 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; }