diff options
Diffstat (limited to 'sys/miscfs/linprocfs/linprocfs_vnops.c')
| -rw-r--r-- | sys/miscfs/linprocfs/linprocfs_vnops.c | 994 |
1 files changed, 994 insertions, 0 deletions
diff --git a/sys/miscfs/linprocfs/linprocfs_vnops.c b/sys/miscfs/linprocfs/linprocfs_vnops.c new file mode 100644 index 0000000..5e9e98a --- /dev/null +++ b/sys/miscfs/linprocfs/linprocfs_vnops.c @@ -0,0 +1,994 @@ +/* + * Copyright (c) 1993, 1995 Jan-Simon Pendry + * Copyright (c) 1993, 1995 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Jan-Simon Pendry. + * + * 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 by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + * + * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 + * + * $FreeBSD$ + */ + +/* + * procfs vnode interface + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/time.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/fcntl.h> +#include <sys/proc.h> +#include <sys/signalvar.h> +#include <sys/vnode.h> +#include <sys/mount.h> +#include <sys/namei.h> +#include <sys/dirent.h> +#include <machine/reg.h> +#include <vm/vm_zone.h> +#include <miscfs/linprocfs/linprocfs.h> +#include <sys/pioctl.h> + +extern struct vnode *procfs_findtextvp __P((struct proc *)); +extern int procfs_kmemaccess __P((struct proc *)); + +static int linprocfs_access __P((struct vop_access_args *)); +static int linprocfs_badop __P((void)); +static int linprocfs_bmap __P((struct vop_bmap_args *)); +static int linprocfs_close __P((struct vop_close_args *)); +static int linprocfs_getattr __P((struct vop_getattr_args *)); +static int linprocfs_inactive __P((struct vop_inactive_args *)); +static int linprocfs_ioctl __P((struct vop_ioctl_args *)); +static int linprocfs_lookup __P((struct vop_lookup_args *)); +static int linprocfs_open __P((struct vop_open_args *)); +static int linprocfs_print __P((struct vop_print_args *)); +static int linprocfs_readdir __P((struct vop_readdir_args *)); +static int linprocfs_readlink __P((struct vop_readlink_args *)); +static int linprocfs_reclaim __P((struct vop_reclaim_args *)); +static int linprocfs_setattr __P((struct vop_setattr_args *)); + +/* + * This is a list of the valid names in the + * process-specific sub-directories. It is + * used in linprocfs_lookup and linprocfs_readdir + */ +static struct proc_target { + u_char pt_type; + u_char pt_namlen; + char *pt_name; + pfstype pt_pfstype; + int (*pt_valid) __P((struct proc *p)); +} proc_targets[] = { +#define N(s) sizeof(s)-1, s + /* name type validp */ + { DT_DIR, N("."), Pproc, NULL }, + { DT_DIR, N(".."), Proot, NULL }, + { DT_REG, N("exe"), Pexe, linprocfs_validfile }, + { DT_REG, N("mem"), Pmem, NULL }, +#undef N +}; +static const int nproc_targets = sizeof(proc_targets) / sizeof(proc_targets[0]); + +static pid_t atopid __P((const char *, u_int)); + +/* + * set things up for doing i/o on + * the pfsnode (vp). (vp) is locked + * on entry, and should be left locked + * on exit. + * + * for procfs we don't need to do anything + * in particular for i/o. all that is done + * is to support exclusive open on process + * memory images. + */ +static int +linprocfs_open(ap) + struct vop_open_args /* { + struct vnode *a_vp; + int a_mode; + struct ucred *a_cred; + struct proc *a_p; + } */ *ap; +{ + struct pfsnode *pfs = VTOPFS(ap->a_vp); + struct proc *p1, *p2; + + p2 = PFIND(pfs->pfs_pid); + if (p2 == NULL) + return (ENOENT); + if (pfs->pfs_pid && !PRISON_CHECK(ap->a_p, p2)) + return (ENOENT); + + switch (pfs->pfs_type) { + case Pmem: + if (((pfs->pfs_flags & FWRITE) && (ap->a_mode & O_EXCL)) || + ((pfs->pfs_flags & O_EXCL) && (ap->a_mode & FWRITE))) + return (EBUSY); + + p1 = ap->a_p; + if (p_trespass(p1, p2) && + !procfs_kmemaccess(p1)) + return (EPERM); + + if (ap->a_mode & FWRITE) + pfs->pfs_flags = ap->a_mode & (FWRITE|O_EXCL); + + return (0); + + default: + break; + } + + return (0); +} + +/* + * close the pfsnode (vp) after doing i/o. + * (vp) is not locked on entry or exit. + * + * nothing to do for procfs other than undo + * any exclusive open flag (see _open above). + */ +static int +linprocfs_close(ap) + struct vop_close_args /* { + struct vnode *a_vp; + int a_fflag; + struct ucred *a_cred; + struct proc *a_p; + } */ *ap; +{ + struct pfsnode *pfs = VTOPFS(ap->a_vp); + struct proc *p; + + switch (pfs->pfs_type) { + case Pmem: + if ((ap->a_fflag & FWRITE) && (pfs->pfs_flags & O_EXCL)) + pfs->pfs_flags &= ~(FWRITE|O_EXCL); + /* + * This rather complicated-looking code is trying to + * determine if this was the last close on this particular + * vnode. While one would expect v_usecount to be 1 at + * that point, it seems that (according to John Dyson) + * the VM system will bump up the usecount. So: if the + * usecount is 2, and VOBJBUF is set, then this is really + * the last close. Otherwise, if the usecount is < 2 + * then it is definitely the last close. + * If this is the last close, then it checks to see if + * the target process has PF_LINGER set in p_pfsflags, + * if this is *not* the case, then the process' stop flags + * are cleared, and the process is woken up. This is + * to help prevent the case where a process has been + * told to stop on an event, but then the requesting process + * has gone away or forgotten about it. + */ + if ((ap->a_vp->v_usecount < 2) + && (p = pfind(pfs->pfs_pid)) + && !(p->p_pfsflags & PF_LINGER)) { + p->p_stops = 0; + p->p_step = 0; + wakeup(&p->p_step); + } + break; + default: + break; + } + + return (0); +} + +/* + * do an ioctl operation on a pfsnode (vp). + * (vp) is not locked on entry or exit. + */ +static int +linprocfs_ioctl(ap) + struct vop_ioctl_args *ap; +{ + struct pfsnode *pfs = VTOPFS(ap->a_vp); + struct proc *procp, *p; + int error; + int signo; + struct procfs_status *psp; + unsigned char flags; + + p = ap->a_p; + procp = pfind(pfs->pfs_pid); + if (procp == NULL) { + return ENOTTY; + } + + if (p_trespass(p, procp)) + return EPERM; + + switch (ap->a_command) { + case PIOCBIS: + procp->p_stops |= *(unsigned int*)ap->a_data; + break; + case PIOCBIC: + procp->p_stops &= ~*(unsigned int*)ap->a_data; + break; + case PIOCSFL: + /* + * NFLAGS is "non-suser_xxx flags" -- currently, only + * PFS_ISUGID ("ignore set u/g id"); + */ +#define NFLAGS (PF_ISUGID) + flags = (unsigned char)*(unsigned int*)ap->a_data; + if (flags & NFLAGS && (error = suser(p))) + return error; + procp->p_pfsflags = flags; + break; + case PIOCGFL: + *(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags; + case PIOCSTATUS: + psp = (struct procfs_status *)ap->a_data; + psp->state = (procp->p_step == 0); + psp->flags = procp->p_pfsflags; + psp->events = procp->p_stops; + if (procp->p_step) { + psp->why = procp->p_stype; + psp->val = procp->p_xstat; + } else { + psp->why = psp->val = 0; /* Not defined values */ + } + break; + case PIOCWAIT: + psp = (struct procfs_status *)ap->a_data; + if (procp->p_step == 0) { + error = tsleep(&procp->p_stype, PWAIT | PCATCH, "piocwait", 0); + if (error) + return error; + } + psp->state = 1; /* It stopped */ + psp->flags = procp->p_pfsflags; + psp->events = procp->p_stops; + psp->why = procp->p_stype; /* why it stopped */ + psp->val = procp->p_xstat; /* any extra info */ + break; + case PIOCCONT: /* Restart a proc */ + if (procp->p_step == 0) + return EINVAL; /* Can only start a stopped process */ + if ((signo = *(int*)ap->a_data) != 0) { + if (signo >= NSIG || signo <= 0) + return EINVAL; + psignal(procp, signo); + } + procp->p_step = 0; + wakeup(&procp->p_step); + break; + default: + return (ENOTTY); + } + return 0; +} + +/* + * do block mapping for pfsnode (vp). + * since we don't use the buffer cache + * for procfs this function should never + * be called. in any case, it's not clear + * what part of the kernel ever makes use + * of this function. for sanity, this is the + * usual no-op bmap, although returning + * (EIO) would be a reasonable alternative. + */ +static int +linprocfs_bmap(ap) + struct vop_bmap_args /* { + struct vnode *a_vp; + daddr_t a_bn; + struct vnode **a_vpp; + daddr_t *a_bnp; + int *a_runp; + } */ *ap; +{ + + if (ap->a_vpp != NULL) + *ap->a_vpp = ap->a_vp; + if (ap->a_bnp != NULL) + *ap->a_bnp = ap->a_bn; + if (ap->a_runp != NULL) + *ap->a_runp = 0; + return (0); +} + +/* + * linprocfs_inactive is called when the pfsnode + * is vrele'd and the reference count goes + * to zero. (vp) will be on the vnode free + * list, so to get it back vget() must be + * used. + * + * (vp) is locked on entry, but must be unlocked on exit. + */ +static int +linprocfs_inactive(ap) + struct vop_inactive_args /* { + struct vnode *a_vp; + } */ *ap; +{ + struct vnode *vp = ap->a_vp; + + VOP_UNLOCK(vp, 0, ap->a_p); + + return (0); +} + +/* + * _reclaim is called when getnewvnode() + * wants to make use of an entry on the vnode + * free list. at this time the filesystem needs + * to free any private data and remove the node + * from any private lists. + */ +static int +linprocfs_reclaim(ap) + struct vop_reclaim_args /* { + struct vnode *a_vp; + } */ *ap; +{ + + return (linprocfs_freevp(ap->a_vp)); +} + +/* + * _print is used for debugging. + * just print a readable description + * of (vp). + */ +static int +linprocfs_print(ap) + struct vop_print_args /* { + struct vnode *a_vp; + } */ *ap; +{ + struct pfsnode *pfs = VTOPFS(ap->a_vp); + + printf("tag VT_PROCFS, type %d, pid %ld, mode %x, flags %lx\n", + pfs->pfs_type, (long)pfs->pfs_pid, pfs->pfs_mode, pfs->pfs_flags); + return (0); +} + +/* + * generic entry point for unsupported operations + */ +static int +linprocfs_badop() +{ + + return (EIO); +} + +/* + * Invent attributes for pfsnode (vp) and store + * them in (vap). + * Directories lengths are returned as zero since + * any real length would require the genuine size + * to be computed, and nothing cares anyway. + * + * this is relatively minimal for procfs. + */ +static int +linprocfs_getattr(ap) + struct vop_getattr_args /* { + struct vnode *a_vp; + struct vattr *a_vap; + struct ucred *a_cred; + struct proc *a_p; + } */ *ap; +{ + struct pfsnode *pfs = VTOPFS(ap->a_vp); + struct vattr *vap = ap->a_vap; + struct proc *procp; + int error; + + /* + * First make sure that the process and its credentials + * still exist. + */ + switch (pfs->pfs_type) { + case Proot: + case Pself: + procp = 0; + break; + + default: + procp = PFIND(pfs->pfs_pid); + if (procp == 0 || procp->p_cred == NULL || + procp->p_ucred == NULL) + return (ENOENT); + } + + error = 0; + + /* start by zeroing out the attributes */ + VATTR_NULL(vap); + + /* next do all the common fields */ + vap->va_type = ap->a_vp->v_type; + vap->va_mode = pfs->pfs_mode; + vap->va_fileid = pfs->pfs_fileno; + vap->va_flags = 0; + vap->va_blocksize = PAGE_SIZE; + vap->va_bytes = vap->va_size = 0; + vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; + + /* + * Make all times be current TOD. + * It would be possible to get the process start + * time from the p_stat structure, but there's + * no "file creation" time stamp anyway, and the + * p_stat structure is not addressible if u. gets + * swapped out for that process. + */ + nanotime(&vap->va_ctime); + vap->va_atime = vap->va_mtime = vap->va_ctime; + + /* + * If the process has exercised some setuid or setgid + * privilege, then rip away read/write permission so + * that only root can gain access. + */ + switch (pfs->pfs_type) { + case Pmem: + /* Retain group kmem readablity. */ + if (procp->p_flag & P_SUGID) + vap->va_mode &= ~(VREAD|VWRITE); + break; + default: + break; + } + + /* + * now do the object specific fields + * + * The size could be set from struct reg, but it's hardly + * worth the trouble, and it puts some (potentially) machine + * dependent data into this machine-independent code. If it + * becomes important then this function should break out into + * a per-file stat function in the corresponding .c file. + */ + + vap->va_nlink = 1; + if (procp) { + vap->va_uid = procp->p_ucred->cr_uid; + vap->va_gid = procp->p_ucred->cr_gid; + } + + switch (pfs->pfs_type) { + case Proot: + /* + * Set nlink to 1 to tell fts(3) we don't actually know. + */ + vap->va_nlink = 1; + vap->va_uid = 0; + vap->va_gid = 0; + vap->va_size = vap->va_bytes = DEV_BSIZE; + break; + + case Pself: { + char buf[16]; /* should be enough */ + vap->va_uid = 0; + vap->va_gid = 0; + vap->va_size = vap->va_bytes = + snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid); + break; + } + + case Pproc: + vap->va_nlink = nproc_targets; + vap->va_size = vap->va_bytes = DEV_BSIZE; + break; + + case Pexe: + error = EOPNOTSUPP; + break; + + case Pmeminfo: + case Pcpuinfo: + break; + + case Pmem: + /* + * If we denied owner access earlier, then we have to + * change the owner to root - otherwise 'ps' and friends + * will break even though they are setgid kmem. *SIGH* + */ + if (procp->p_flag & P_SUGID) + vap->va_uid = 0; + else + vap->va_uid = procp->p_ucred->cr_uid; + vap->va_gid = KMEM_GROUP; + break; + + default: + panic("linprocfs_getattr"); + } + + return (error); +} + +static int +linprocfs_setattr(ap) + struct vop_setattr_args /* { + struct vnode *a_vp; + struct vattr *a_vap; + struct ucred *a_cred; + struct proc *a_p; + } */ *ap; +{ + + if (ap->a_vap->va_flags != VNOVAL) + return (EOPNOTSUPP); + + /* + * just fake out attribute setting + * it's not good to generate an error + * return, otherwise things like creat() + * will fail when they try to set the + * file length to 0. worse, this means + * that echo $note > /proc/$pid/note will fail. + */ + + return (0); +} + +/* + * implement access checking. + * + * something very similar to this code is duplicated + * throughout the 4bsd kernel and should be moved + * into kern/vfs_subr.c sometime. + * + * actually, the check for super-user is slightly + * broken since it will allow read access to write-only + * objects. this doesn't cause any particular trouble + * but does mean that the i/o entry points need to check + * that the operation really does make sense. + */ +static int +linprocfs_access(ap) + struct vop_access_args /* { + struct vnode *a_vp; + int a_mode; + struct ucred *a_cred; + struct proc *a_p; + } */ *ap; +{ + struct vattr *vap; + struct vattr vattr; + int error; + + /* + * If you're the super-user, + * you always get access. + */ + if (ap->a_cred->cr_uid == 0) + return (0); + + vap = &vattr; + error = VOP_GETATTR(ap->a_vp, vap, ap->a_cred, ap->a_p); + if (error) + return (error); + + /* + * Access check is based on only one of owner, group, public. + * If not owner, then check group. If not a member of the + * group, then check public access. + */ + if (ap->a_cred->cr_uid != vap->va_uid) { + gid_t *gp; + int i; + + ap->a_mode >>= 3; + gp = ap->a_cred->cr_groups; + for (i = 0; i < ap->a_cred->cr_ngroups; i++, gp++) + if (vap->va_gid == *gp) + goto found; + ap->a_mode >>= 3; +found: + ; + } + + if ((vap->va_mode & ap->a_mode) == ap->a_mode) + return (0); + + return (EACCES); +} + +/* + * lookup. this is incredibly complicated in the + * general case, however for most pseudo-filesystems + * very little needs to be done. + * + * unless you want to get a migraine, just make sure your + * filesystem doesn't do any locking of its own. otherwise + * read and inwardly digest ufs_lookup(). + */ +static int +linprocfs_lookup(ap) + struct vop_lookup_args /* { + struct vnode * a_dvp; + struct vnode ** a_vpp; + struct componentname * a_cnp; + } */ *ap; +{ + struct componentname *cnp = ap->a_cnp; + struct vnode **vpp = ap->a_vpp; + struct vnode *dvp = ap->a_dvp; + char *pname = cnp->cn_nameptr; + struct proc *curp = cnp->cn_proc; + struct proc_target *pt; + struct vnode *fvp; + pid_t pid; + struct pfsnode *pfs; + struct proc *p; + int i; + + *vpp = NULL; + + if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) + return (EROFS); + + if (cnp->cn_namelen == 1 && *pname == '.') { + *vpp = dvp; + VREF(dvp); + /* vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, curp); */ + return (0); + } + + pfs = VTOPFS(dvp); + switch (pfs->pfs_type) { + case Proot: + if (cnp->cn_flags & ISDOTDOT) + return (EIO); + + if (CNEQ(cnp, "self", 4)) + return (linprocfs_allocvp(dvp->v_mount, vpp, 0, Pself)); + if (CNEQ(cnp, "meminfo", 7)) + return (linprocfs_allocvp(dvp->v_mount, vpp, 0, Pmeminfo)); + if (CNEQ(cnp, "cpuinfo", 7)) + return (linprocfs_allocvp(dvp->v_mount, vpp, 0, Pcpuinfo)); + + pid = atopid(pname, cnp->cn_namelen); + if (pid == NO_PID) + break; + + p = PFIND(pid); + if (p == 0) + break; + + return (linprocfs_allocvp(dvp->v_mount, vpp, pid, Pproc)); + + case Pproc: + if (cnp->cn_flags & ISDOTDOT) + return (linprocfs_root(dvp->v_mount, vpp)); + + p = PFIND(pfs->pfs_pid); + if (p == 0) + break; + + for (pt = proc_targets, i = 0; i < nproc_targets; pt++, i++) { + if (cnp->cn_namelen == pt->pt_namlen && + bcmp(pt->pt_name, pname, cnp->cn_namelen) == 0 && + (pt->pt_valid == NULL || (*pt->pt_valid)(p))) + goto found; + } + break; + + found: + if (pt->pt_pfstype == Pexe) { + fvp = procfs_findtextvp(p); + /* We already checked that it exists. */ + VREF(fvp); + vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, curp); + *vpp = fvp; + return (0); + } + + return (linprocfs_allocvp(dvp->v_mount, vpp, pfs->pfs_pid, + pt->pt_pfstype)); + + default: + return (ENOTDIR); + } + + return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); +} + +/* + * Does this process have a text file? + */ +int +linprocfs_validfile(p) + struct proc *p; +{ + + return (procfs_findtextvp(p) != NULLVP); +} + +/* + * readdir() returns directory entries from pfsnode (vp). + * + * We generate just one directory entry at a time, as it would probably + * not pay off to buffer several entries locally to save uiomove calls. + */ +static int +linprocfs_readdir(ap) + struct vop_readdir_args /* { + struct vnode *a_vp; + struct uio *a_uio; + struct ucred *a_cred; + int *a_eofflag; + int *a_ncookies; + u_long **a_cookies; + } */ *ap; +{ + struct uio *uio = ap->a_uio; + struct dirent d; + struct dirent *dp = &d; + struct pfsnode *pfs; + int count, error, i, off; + static u_int delen; + + if (!delen) { + + d.d_namlen = PROCFS_NAMELEN; + delen = GENERIC_DIRSIZ(&d); + } + + pfs = VTOPFS(ap->a_vp); + + off = (int)uio->uio_offset; + if (off != uio->uio_offset || off < 0 || + off % delen != 0 || uio->uio_resid < delen) + return (EINVAL); + + error = 0; + count = 0; + i = off / delen; + + switch (pfs->pfs_type) { + /* + * this is for the process-specific sub-directories. + * all that is needed to is copy out all the entries + * from the procent[] table (top of this file). + */ + case Pproc: { + struct proc *p; + struct proc_target *pt; + + p = PFIND(pfs->pfs_pid); + if (p == NULL) + break; + if (!PRISON_CHECK(curproc, p)) + break; + + for (pt = &proc_targets[i]; + uio->uio_resid >= delen && i < nproc_targets; pt++, i++) { + if (pt->pt_valid && (*pt->pt_valid)(p) == 0) + continue; + + dp->d_reclen = delen; + dp->d_fileno = PROCFS_FILENO(pfs->pfs_pid, pt->pt_pfstype); + dp->d_namlen = pt->pt_namlen; + bcopy(pt->pt_name, dp->d_name, pt->pt_namlen + 1); + dp->d_type = pt->pt_type; + + if ((error = uiomove((caddr_t)dp, delen, uio)) != 0) + break; + } + + break; + } + + /* + * this is for the root of the procfs filesystem + * what is needed is a special entry for "self" + * followed by an entry for each process on allproc +#ifdef PROCFS_ZOMBIE + * and zombproc. +#endif + */ + + case Proot: { +#ifdef PROCFS_ZOMBIE + int doingzomb = 0; +#endif + int pcnt = 0; + volatile struct proc *p = allproc.lh_first; + + for (; p && uio->uio_resid >= delen; i++, pcnt++) { + bzero((char *) dp, delen); + dp->d_reclen = delen; + + switch (i) { + case 0: /* `.' */ + case 1: /* `..' */ + dp->d_fileno = PROCFS_FILENO(0, Proot); + dp->d_namlen = i + 1; + bcopy("..", dp->d_name, dp->d_namlen); + dp->d_name[i + 1] = '\0'; + dp->d_type = DT_DIR; + break; + + case 2: + dp->d_fileno = PROCFS_FILENO(0, Pself); + dp->d_namlen = 4; + bcopy("self", dp->d_name, 5); + dp->d_type = DT_LNK; + break; + + case 3: + dp->d_fileno = PROCFS_FILENO(0, Pmeminfo); + dp->d_namlen = 7; + bcopy("meminfo", dp->d_name, 8); + dp->d_type = DT_REG; + break; + + case 4: + dp->d_fileno = PROCFS_FILENO(0, Pcpuinfo); + dp->d_namlen = 7; + bcopy("cpuinfo", dp->d_name, 8); + dp->d_type = DT_REG; + break; + + default: + while (pcnt < i) { + p = p->p_list.le_next; + if (!p) + goto done; + if (!PRISON_CHECK(curproc, p)) + continue; + pcnt++; + } + while (!PRISON_CHECK(curproc, p)) { + p = p->p_list.le_next; + if (!p) + goto done; + } + dp->d_fileno = PROCFS_FILENO(p->p_pid, Pproc); + dp->d_namlen = sprintf(dp->d_name, "%ld", + (long)p->p_pid); + dp->d_type = DT_REG; + p = p->p_list.le_next; + break; + } + + if ((error = uiomove((caddr_t)dp, delen, uio)) != 0) + break; + } + done: + +#ifdef PROCFS_ZOMBIE + if (p == 0 && doingzomb == 0) { + doingzomb = 1; + p = zombproc.lh_first; + goto again; + } +#endif + + break; + + } + + default: + error = ENOTDIR; + break; + } + + uio->uio_offset = i * delen; + + return (error); +} + +/* + * readlink reads the link of `self' + */ +static int +linprocfs_readlink(ap) + struct vop_readlink_args *ap; +{ + char buf[16]; /* should be enough */ + int len; + + if (VTOPFS(ap->a_vp)->pfs_fileno != PROCFS_FILENO(0, Pself)) + return (EINVAL); + + len = snprintf(buf, sizeof(buf), "%ld", (long)curproc->p_pid); + + return (uiomove((caddr_t)buf, len, ap->a_uio)); +} + +/* + * convert decimal ascii to pid_t + */ +static pid_t +atopid(b, len) + const char *b; + u_int len; +{ + pid_t p = 0; + + while (len--) { + char c = *b++; + if (c < '0' || c > '9') + return (NO_PID); + p = 10 * p + (c - '0'); + if (p > PID_MAX) + return (NO_PID); + } + + return (p); +} + +/* + * procfs vnode operations. + */ +vop_t **linprocfs_vnodeop_p; +static struct vnodeopv_entry_desc linprocfs_vnodeop_entries[] = { + { &vop_default_desc, (vop_t *) vop_defaultop }, + { &vop_access_desc, (vop_t *) linprocfs_access }, + { &vop_advlock_desc, (vop_t *) linprocfs_badop }, + { &vop_bmap_desc, (vop_t *) linprocfs_bmap }, + { &vop_close_desc, (vop_t *) linprocfs_close }, + { &vop_create_desc, (vop_t *) linprocfs_badop }, + { &vop_getattr_desc, (vop_t *) linprocfs_getattr }, + { &vop_inactive_desc, (vop_t *) linprocfs_inactive }, + { &vop_link_desc, (vop_t *) linprocfs_badop }, + { &vop_lookup_desc, (vop_t *) linprocfs_lookup }, + { &vop_mkdir_desc, (vop_t *) linprocfs_badop }, + { &vop_mknod_desc, (vop_t *) linprocfs_badop }, + { &vop_open_desc, (vop_t *) linprocfs_open }, + { &vop_pathconf_desc, (vop_t *) vop_stdpathconf }, + { &vop_print_desc, (vop_t *) linprocfs_print }, + { &vop_read_desc, (vop_t *) linprocfs_rw }, + { &vop_readdir_desc, (vop_t *) linprocfs_readdir }, + { &vop_readlink_desc, (vop_t *) linprocfs_readlink }, + { &vop_reclaim_desc, (vop_t *) linprocfs_reclaim }, + { &vop_remove_desc, (vop_t *) linprocfs_badop }, + { &vop_rename_desc, (vop_t *) linprocfs_badop }, + { &vop_rmdir_desc, (vop_t *) linprocfs_badop }, + { &vop_setattr_desc, (vop_t *) linprocfs_setattr }, + { &vop_symlink_desc, (vop_t *) linprocfs_badop }, + { &vop_write_desc, (vop_t *) linprocfs_rw }, + { &vop_ioctl_desc, (vop_t *) linprocfs_ioctl }, + { NULL, NULL } +}; +static struct vnodeopv_desc linprocfs_vnodeop_opv_desc = + { &linprocfs_vnodeop_p, linprocfs_vnodeop_entries }; + +VNODEOP_SET(linprocfs_vnodeop_opv_desc); |
