/* $NetBSD: linux_llseek.c,v 1.19 1997/10/16 23:54:40 christos Exp $ */ /* * Copyright (c) 1995 Frank van der Linden * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project * by Frank van der Linden * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int linux_to_bsd_ioflags __P((int)); static int bsd_to_linux_ioflags __P((int)); static void bsd_to_linux_flock __P((struct flock *, struct linux_flock *)); static void linux_to_bsd_flock __P((struct linux_flock *, struct flock *)); static void bsd_to_linux_stat __P((struct stat *, struct linux_stat *)); static int linux_stat1 __P((struct proc *, void *, register_t *, int)); /* * Some file-related calls are handled here. The usual flag conversion * an structure conversion is done, and alternate emul path searching. */ /* * The next two functions convert between the Linux and NetBSD values * of the flags used in open(2) and fcntl(2). */ static int linux_to_bsd_ioflags(lflags) int lflags; { int res = 0; res |= cvtto_bsd_mask(lflags, LINUX_O_WRONLY, O_WRONLY); res |= cvtto_bsd_mask(lflags, LINUX_O_RDONLY, O_RDONLY); res |= cvtto_bsd_mask(lflags, LINUX_O_RDWR, O_RDWR); res |= cvtto_bsd_mask(lflags, LINUX_O_CREAT, O_CREAT); res |= cvtto_bsd_mask(lflags, LINUX_O_EXCL, O_EXCL); res |= cvtto_bsd_mask(lflags, LINUX_O_NOCTTY, O_NOCTTY); res |= cvtto_bsd_mask(lflags, LINUX_O_TRUNC, O_TRUNC); res |= cvtto_bsd_mask(lflags, LINUX_O_NDELAY, O_NDELAY); res |= cvtto_bsd_mask(lflags, LINUX_O_SYNC, O_FSYNC); res |= cvtto_bsd_mask(lflags, LINUX_FASYNC, O_ASYNC); res |= cvtto_bsd_mask(lflags, LINUX_O_APPEND, O_APPEND); return res; } static int bsd_to_linux_ioflags(bflags) int bflags; { int res = 0; res |= cvtto_linux_mask(bflags, O_WRONLY, LINUX_O_WRONLY); res |= cvtto_linux_mask(bflags, O_RDONLY, LINUX_O_RDONLY); res |= cvtto_linux_mask(bflags, O_RDWR, LINUX_O_RDWR); res |= cvtto_linux_mask(bflags, O_CREAT, LINUX_O_CREAT); res |= cvtto_linux_mask(bflags, O_EXCL, LINUX_O_EXCL); res |= cvtto_linux_mask(bflags, O_NOCTTY, LINUX_O_NOCTTY); res |= cvtto_linux_mask(bflags, O_TRUNC, LINUX_O_TRUNC); res |= cvtto_linux_mask(bflags, O_NDELAY, LINUX_O_NDELAY); res |= cvtto_linux_mask(bflags, O_FSYNC, LINUX_O_SYNC); res |= cvtto_linux_mask(bflags, O_ASYNC, LINUX_FASYNC); res |= cvtto_linux_mask(bflags, O_APPEND, LINUX_O_APPEND); return res; } /* * creat(2) is an obsolete function, but it's present as a Linux * system call, so let's deal with it. * * Just call open(2) with the TRUNC, CREAT and WRONLY flags. */ int linux_sys_creat(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_creat_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap = v; struct sys_open_args oa; caddr_t sg; sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); SCARG(&oa, path) = SCARG(uap, path); SCARG(&oa, flags) = O_CREAT | O_TRUNC | O_WRONLY; SCARG(&oa, mode) = SCARG(uap, mode); return sys_open(p, &oa, retval); } /* * open(2). Take care of the different flag values, and let the * NetBSD syscall do the real work. See if this operation * gives the current process a controlling terminal. * (XXX is this necessary?) */ int linux_sys_open(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_open_args /* { syscallarg(char *) path; syscallarg(int) flags; syscallarg(int) mode; } */ *uap = v; int error, fl; struct sys_open_args boa; caddr_t sg; sg = stackgap_init(p->p_emul); fl = linux_to_bsd_ioflags(SCARG(uap, flags)); if (fl & O_CREAT) LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); else LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); SCARG(&boa, path) = SCARG(uap, path); SCARG(&boa, flags) = fl; SCARG(&boa, mode) = SCARG(uap, mode); if ((error = sys_open(p, &boa, retval))) return error; /* * this bit from sunos_misc.c (and svr4_fcntl.c). * If we are a session leader, and we don't have a controlling * terminal yet, and the O_NOCTTY flag is not set, try to make * this the controlling terminal. */ if (!(fl & O_NOCTTY) && SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) { struct filedesc *fdp = p->p_fd; struct file *fp = fdp->fd_ofiles[*retval]; /* ignore any error, just give it a try */ if (fp->f_type == DTYPE_VNODE) (fp->f_ops->fo_ioctl) (fp, TIOCSCTTY, (caddr_t) 0, p); } return 0; } /* * This appears to be part of a Linux attempt to switch to 64 bits file sizes. */ int linux_sys_llseek(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_llseek_args /* { syscallarg(int) fd; syscallarg(uint32_t) ohigh; syscallarg(uint32_t) olow; syscallarg(caddr_t) res; syscallarg(int) whence; } */ *uap = v; struct sys_lseek_args bla; int error; off_t off; off = SCARG(uap, olow) | (((off_t) SCARG(uap, ohigh)) << 32); SCARG(&bla, fd) = SCARG(uap, fd); SCARG(&bla, offset) = off; SCARG(&bla, whence) = SCARG(uap, whence); if ((error = sys_lseek(p, &bla, retval))) return error; if ((error = copyout(retval, SCARG(uap, res), sizeof (off_t)))) return error; retval[0] = 0; return 0; } /* * The next two functions take care of converting the flock * structure back and forth between Linux and NetBSD format. * The only difference in the structures is the order of * the fields, and the 'whence' value. */ static void bsd_to_linux_flock(bfp, lfp) struct flock *bfp; struct linux_flock *lfp; { lfp->l_start = bfp->l_start; lfp->l_len = bfp->l_len; lfp->l_pid = bfp->l_pid; lfp->l_whence = bfp->l_whence; switch (bfp->l_type) { case F_RDLCK: lfp->l_type = LINUX_F_RDLCK; break; case F_UNLCK: lfp->l_type = LINUX_F_UNLCK; break; case F_WRLCK: lfp->l_type = LINUX_F_WRLCK; break; } } static void linux_to_bsd_flock(lfp, bfp) struct linux_flock *lfp; struct flock *bfp; { bfp->l_start = lfp->l_start; bfp->l_len = lfp->l_len; bfp->l_pid = lfp->l_pid; bfp->l_whence = lfp->l_whence; switch (lfp->l_type) { case LINUX_F_RDLCK: bfp->l_type = F_RDLCK; break; case LINUX_F_UNLCK: bfp->l_type = F_UNLCK; break; case LINUX_F_WRLCK: bfp->l_type = F_WRLCK; break; } } /* * Most actions in the fcntl() call are straightforward; simply * pass control to the NetBSD system call. A few commands need * conversions after the actual system call has done its work, * because the flag values and lock structure are different. */ int linux_sys_fcntl(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_fcntl_args /* { syscallarg(int) fd; syscallarg(int) cmd; syscallarg(void *) arg; } */ *uap = v; int fd, cmd, error, val; caddr_t arg, sg; struct linux_flock lfl; struct flock *bfp, bfl; struct sys_fcntl_args fca; struct filedesc *fdp; struct file *fp; struct vnode *vp; struct vattr va; long pgid; struct pgrp *pgrp; struct tty *tp, *(*d_tty) __P((dev_t)); fd = SCARG(uap, fd); cmd = SCARG(uap, cmd); arg = (caddr_t) SCARG(uap, arg); switch (cmd) { case LINUX_F_DUPFD: cmd = F_DUPFD; break; case LINUX_F_GETFD: cmd = F_GETFD; break; case LINUX_F_SETFD: cmd = F_SETFD; break; case LINUX_F_GETFL: SCARG(&fca, fd) = fd; SCARG(&fca, cmd) = F_GETFL; SCARG(&fca, arg) = arg; if ((error = sys_fcntl(p, &fca, retval))) return error; retval[0] = bsd_to_linux_ioflags(retval[0]); return 0; case LINUX_F_SETFL: val = linux_to_bsd_ioflags((int)SCARG(uap, arg)); SCARG(&fca, fd) = fd; SCARG(&fca, cmd) = F_SETFL; SCARG(&fca, arg) = (caddr_t) val; return sys_fcntl(p, &fca, retval); case LINUX_F_GETLK: sg = stackgap_init(p->p_emul); bfp = (struct flock *) stackgap_alloc(&sg, sizeof *bfp); if ((error = copyin(arg, &lfl, sizeof lfl))) return error; linux_to_bsd_flock(&lfl, &bfl); if ((error = copyout(&bfl, bfp, sizeof bfl))) return error; SCARG(&fca, fd) = fd; SCARG(&fca, cmd) = F_GETLK; SCARG(&fca, arg) = bfp; if ((error = sys_fcntl(p, &fca, retval))) return error; if ((error = copyin(bfp, &bfl, sizeof bfl))) return error; bsd_to_linux_flock(&bfl, &lfl); return copyout(&lfl, arg, sizeof lfl); break; case LINUX_F_SETLK: case LINUX_F_SETLKW: cmd = (cmd == LINUX_F_SETLK ? F_SETLK : F_SETLKW); if ((error = copyin(arg, &lfl, sizeof lfl))) return error; linux_to_bsd_flock(&lfl, &bfl); sg = stackgap_init(p->p_emul); bfp = (struct flock *) stackgap_alloc(&sg, sizeof *bfp); if ((error = copyout(&bfl, bfp, sizeof bfl))) return error; SCARG(&fca, fd) = fd; SCARG(&fca, cmd) = cmd; SCARG(&fca, arg) = bfp; return sys_fcntl(p, &fca, retval); break; case LINUX_F_SETOWN: case LINUX_F_GETOWN: /* * We need to route around the normal fcntl() for these calls, * since it uses TIOC{G,S}PGRP, which is too restrictive for * Linux F_{G,S}ETOWN semantics. For sockets, this problem * does not exist. */ fdp = p->p_fd; if ((u_int)fd >= fdp->fd_nfiles || (fp = fdp->fd_ofiles[fd]) == NULL) return EBADF; if (fp->f_type == DTYPE_SOCKET) { cmd = cmd == LINUX_F_SETOWN ? F_SETOWN : F_GETOWN; break; } vp = (struct vnode *)fp->f_data; if (vp->v_type != VCHR) return EINVAL; if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) return error; d_tty = cdevsw[major(va.va_rdev)].d_tty; if (!d_tty || (!(tp = (*d_tty)(va.va_rdev)))) return EINVAL; if (cmd == LINUX_F_GETOWN) { retval[0] = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; return 0; } if ((long)arg <= 0) { pgid = -(long)arg; } else { struct proc *p1 = pfind((long)arg); if (p1 == 0) return (ESRCH); pgid = (long)p1->p_pgrp->pg_id; } pgrp = pgfind(pgid); if (pgrp == NULL || pgrp->pg_session != p->p_session) return EPERM; tp->t_pgrp = pgrp; return 0; default: return EOPNOTSUPP; } SCARG(&fca, fd) = fd; SCARG(&fca, cmd) = cmd; SCARG(&fca, arg) = arg; return sys_fcntl(p, &fca, retval); } /* * Convert a NetBSD stat structure to a Linux stat structure. * Only the order of the fields and the padding in the structure * is different. linux_fakedev is a machine-dependent function * which optionally converts device driver major/minor numbers * (XXX horrible, but what can you do against code that compares * things against constant major device numbers? sigh) */ static void bsd_to_linux_stat(bsp, lsp) struct stat *bsp; struct linux_stat *lsp; { lsp->lst_dev = bsp->st_dev; lsp->lst_ino = bsp->st_ino; lsp->lst_mode = (linux_mode_t)bsp->st_mode; if (bsp->st_nlink >= (1 << 15)) lsp->lst_nlink = (1 << 15) - 1; else lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; lsp->lst_uid = bsp->st_uid; lsp->lst_gid = bsp->st_gid; lsp->lst_rdev = linux_fakedev(bsp->st_rdev); lsp->lst_size = bsp->st_size; lsp->lst_blksize = bsp->st_blksize; lsp->lst_blocks = bsp->st_blocks; lsp->lst_atime = bsp->st_atime; lsp->lst_mtime = bsp->st_mtime; lsp->lst_ctime = bsp->st_ctime; } /* * The stat functions below are plain sailing. stat and lstat are handled * by one function to avoid code duplication. */ int linux_sys_fstat(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_fstat_args /* { syscallarg(int) fd; syscallarg(linux_stat *) sp; } */ *uap = v; struct sys_fstat_args fsa; struct linux_stat tmplst; struct stat *st,tmpst; caddr_t sg; int error; sg = stackgap_init(p->p_emul); st = stackgap_alloc(&sg, sizeof (struct stat)); SCARG(&fsa, fd) = SCARG(uap, fd); SCARG(&fsa, sb) = st; if ((error = sys_fstat(p, &fsa, retval))) return error; if ((error = copyin(st, &tmpst, sizeof tmpst))) return error; bsd_to_linux_stat(&tmpst, &tmplst); if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) return error; return 0; } static int linux_stat1(p, v, retval, dolstat) struct proc *p; void *v; register_t *retval; int dolstat; { struct sys_stat_args sa; struct linux_stat tmplst; struct stat *st, tmpst; caddr_t sg; int error; struct linux_sys_stat_args *uap = v; sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); st = stackgap_alloc(&sg, sizeof (struct stat)); SCARG(&sa, ub) = st; SCARG(&sa, path) = SCARG(uap, path); if ((error = (dolstat ? sys_lstat(p, &sa, retval) : sys_stat(p, &sa, retval)))) return error; if ((error = copyin(st, &tmpst, sizeof tmpst))) return error; bsd_to_linux_stat(&tmpst, &tmplst); if ((error = copyout(&tmplst, SCARG(uap, sp), sizeof tmplst))) return error; return 0; } int linux_sys_stat(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_stat_args /* { syscallarg(char *) path; syscallarg(struct linux_stat *) sp; } */ *uap = v; return linux_stat1(p, uap, retval, 0); } int linux_sys_lstat(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_lstat_args /* { syscallarg(char *) path; syscallarg(struct linux_stat *) sp; } */ *uap = v; return linux_stat1(p, uap, retval, 1); } /* * The following syscalls are mostly here because of the alternate path check. */ int linux_sys_access(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_access_args /* { syscallarg(char *) path; syscallarg(int) flags; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return sys_access(p, uap, retval); } int linux_sys_unlink(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_unlink_args /* { syscallarg(char *) path; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return sys_unlink(p, uap, retval); } int linux_sys_chdir(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_chdir_args /* { syscallarg(char *) path; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return sys_chdir(p, uap, retval); } int linux_sys_mknod(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_mknod_args /* { syscallarg(char *) path; syscallarg(int) mode; syscallarg(int) dev; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); struct sys_mkfifo_args bma; LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); /* * BSD handles FIFOs seperately */ if (SCARG(uap, mode) & S_IFIFO) { SCARG(&bma, path) = SCARG(uap, path); SCARG(&bma, mode) = SCARG(uap, mode); return sys_mkfifo(p, uap, retval); } else return sys_mknod(p, uap, retval); } int linux_sys_chmod(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_chmod_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return sys_chmod(p, uap, retval); } int linux_sys_chown(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_chown_args /* { syscallarg(char *) path; syscallarg(int) uid; syscallarg(int) gid; } */ *uap = v; struct sys_chown_args bca; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); SCARG(&bca, path) = SCARG(uap, path); SCARG(&bca, uid) = ((linux_uid_t)SCARG(uap, uid) == (linux_uid_t)-1) ? (uid_t)-1 : SCARG(uap, uid); SCARG(&bca, gid) = ((linux_gid_t)SCARG(uap, gid) == (linux_gid_t)-1) ? (gid_t)-1 : SCARG(uap, gid); return sys_chown(p, &bca, retval); } int linux_sys_fchown(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_fchown_args /* { syscallarg(int) fd; syscallarg(int) uid; syscallarg(int) gid; } */ *uap = v; struct sys_fchown_args bfa; SCARG(&bfa, fd) = SCARG(uap, fd); SCARG(&bfa, uid) = ((linux_uid_t)SCARG(uap, uid) == (linux_uid_t)-1) ? (uid_t)-1 : SCARG(uap, uid); SCARG(&bfa, gid) = ((linux_gid_t)SCARG(uap, gid) == (linux_gid_t)-1) ? (gid_t)-1 : SCARG(uap, gid); return sys_fchown(p, &bfa, retval); } int linux_sys_rename(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_rename_args /* { syscallarg(char *) from; syscallarg(char *) to; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, from)); LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); return sys_posix_rename(p, uap, retval); } int linux_sys_mkdir(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_mkdir_args /* { syscallarg(char *) path; syscallarg(int) mode; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, path)); return sys_mkdir(p, uap, retval); } int linux_sys_rmdir(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_rmdir_args /* { syscallarg(char *) path; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return sys_rmdir(p, uap, retval); } int linux_sys_symlink(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_symlink_args /* { syscallarg(char *) path; syscallarg(char *) to; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); LINUX_CHECK_ALT_CREAT(p, &sg, SCARG(uap, to)); return sys_symlink(p, uap, retval); } int linux_sys_readlink(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_readlink_args /* { syscallarg(char *) name; syscallarg(char *) buf; syscallarg(int) count; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, name)); return sys_readlink(p, uap, retval); } int linux_sys_truncate(p, v, retval) struct proc *p; void *v; register_t *retval; { struct linux_sys_truncate_args /* { syscallarg(char *) path; syscallarg(long) length; } */ *uap = v; caddr_t sg = stackgap_init(p->p_emul); LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); return compat_43_sys_truncate(p, uap, retval); } /* * This is just fsync() for now (just as it is in the Linux kernel) */ int linux_sys_fdatasync(p, v, retval) struct proc *p; void *v; register_t *retval; { #ifdef notdef struct linux_sys_fdatasync_args /* { syscallarg(int) fd; } */ *uap = v; #endif return sys_fsync(p, v, retval); }