Home | History | Annotate | Line # | Download | only in fstat
ptyfs.c revision 1.1 
      1 /*	$NetBSD: ptyfs.c,v 1.1 2004/12/12 22:41:04 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __RCSID("$NetBSD: ptyfs.c,v 1.1 2004/12/12 22:41:04 christos Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/types.h>
     44 #include <sys/time.h>
     45 #include <sys/proc.h>
     46 #include <sys/user.h>
     47 #include <sys/stat.h>
     48 #include <sys/vnode.h>
     49 #include <sys/mount.h>
     50 
     51 #define _KERNEL
     52 #include <fs/ptyfs/ptyfs.h>
     53 #undef _KERNEL
     54 
     55 #include <paths.h>
     56 #include <err.h>
     57 #include <kvm.h>
     58 #include <dirent.h>
     59 #include "fstat.h"
     60 
     61 static mode_t getptsmajor(void);
     62 
     63 /* XXX: Dup code from gen/devname.c */
     64 static mode_t
     65 getptsmajor(void)
     66 {
     67 	DIR *dirp;
     68 	struct dirent *dp;
     69 	struct stat st;
     70 	char buf[MAXPATHLEN];
     71 
     72 	if ((dirp = opendir(_PATH_DEV_PTS)) == NULL)
     73 		return (mode_t)~0;
     74 
     75 	while ((dp = readdir(dirp)) != NULL) {
     76 		if (dp->d_name[0] == '.')
     77 			continue;
     78 		(void)snprintf(buf, sizeof(buf), "%s%s", _PATH_DEV_PTS,
     79 		    dp->d_name);
     80 		if (stat(buf, &st) == -1)
     81 			continue;
     82 		(void)closedir(dirp);
     83 		return major(st.st_rdev);
     84 	}
     85 	(void)closedir(dirp);
     86 	return (mode_t)~0;
     87 }
     88 
     89 int
     90 ptyfs_filestat(struct vnode *vp, struct filestat *fsp)
     91 {
     92 	struct ptyfsnode pn;
     93 	static mode_t maj = 0;
     94 
     95 	if (!KVM_READ(VTOPTYFS(vp), &pn, sizeof(pn))) {
     96 		dprintf("can't read ptyfs_node at %p for pid %d",
     97 		    VTOPTYFS(vp), Pid);
     98 		return 0;
     99 	}
    100 	fsp->fsid = 0; /* XXX */
    101 	fsp->fileid = (long)pn.ptyfs_fileno;
    102 	fsp->mode = pn.ptyfs_mode;
    103 	fsp->size = 0;
    104 	if (maj == 0)
    105 		maj = getptsmajor();
    106 	if (maj == ~0)
    107 		fsp->rdev = makedev(maj, pn.ptyfs_pty);
    108 	return 1;
    109 }
    110