fstat.c revision 17808 
1/*-
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)fstat.c	8.1 (Berkeley) 6/6/93";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/time.h>
46#include <sys/proc.h>
47#include <sys/user.h>
48#include <sys/stat.h>
49#include <sys/vnode.h>
50#include <sys/socket.h>
51#include <sys/socketvar.h>
52#include <sys/domain.h>
53#include <sys/protosw.h>
54#include <sys/unpcb.h>
55#include <sys/sysctl.h>
56#include <sys/filedesc.h>
57#include <sys/queue.h>
58#include <sys/pipe.h>
59#define	KERNEL
60#include <sys/file.h>
61#include <ufs/ufs/quota.h>
62#include <ufs/ufs/inode.h>
63#undef KERNEL
64#define NFS
65#include <sys/mount.h>
66#include <nfs/nfsproto.h>
67#include <nfs/rpcv2.h>
68#include <nfs/nfs.h>
69#include <nfs/nfsnode.h>
70#undef NFS
71
72#include <net/route.h>
73#include <netinet/in.h>
74#include <netinet/in_systm.h>
75#include <netinet/ip.h>
76#include <netinet/in_pcb.h>
77
78#include <ctype.h>
79#include <errno.h>
80#include <kvm.h>
81#include <nlist.h>
82#include <paths.h>
83#include <pwd.h>
84#include <stdio.h>
85#include <stdlib.h>
86#include <string.h>
87
88#define	TEXT	-1
89#define	CDIR	-2
90#define	RDIR	-3
91#define	TRACE	-4
92
93typedef struct devs {
94	struct	devs *next;
95	long	fsid;
96	ino_t	ino;
97	char	*name;
98} DEVS;
99DEVS *devs;
100
101struct  filestat {
102	long	fsid;
103	long	fileid;
104	mode_t	mode;
105	u_long	size;
106	dev_t	rdev;
107};
108
109#ifdef notdef
110struct nlist nl[] = {
111	{ "" },
112};
113#endif
114
115int 	fsflg,	/* show files on same filesystem as file(s) argument */
116	pflg,	/* show files open by a particular pid */
117	uflg;	/* show files open by a particular (effective) user */
118int 	checkfile; /* true if restricting to particular files or filesystems */
119int	nflg;	/* (numerical) display f.s. and rdev as dev_t */
120int	vflg;	/* display errors in locating kernel data objects etc... */
121
122#define dprintf	if (vflg) fprintf
123
124struct file **ofiles;	/* buffer of pointers to file structures */
125int maxfiles;
126#define ALLOC_OFILES(d)	\
127	if ((d) > maxfiles) { \
128		free(ofiles); \
129		ofiles = malloc((d) * sizeof(struct file *)); \
130		if (ofiles == NULL) { \
131			fprintf(stderr, "fstat: %s\n", strerror(errno)); \
132			exit(1); \
133		} \
134		maxfiles = (d); \
135	}
136
137/*
138 * a kvm_read that returns true if everything is read
139 */
140#define KVM_READ(kaddr, paddr, len) \
141	(kvm_read(kd, (u_long)(kaddr), (char *)(paddr), (len)) == (len))
142
143kvm_t *kd;
144
145void dofiles __P((struct kinfo_proc *kp));
146void vtrans __P((struct vnode *vp, int i, int flag));
147int  ufs_filestat __P((struct vnode *vp, struct filestat *fsp));
148int  nfs_filestat __P((struct vnode *vp, struct filestat *fsp));
149char *getmnton __P((struct mount *m));
150void pipetrans __P((struct pipe *pi, int i, int flag));
151void socktrans __P((struct socket *sock, int i));
152void getinetproto __P((int number));
153int  getfname __P((char *filename));
154void usage __P((void));
155
156
157int
158main(argc, argv)
159	int argc;
160	char **argv;
161{
162	register struct passwd *passwd;
163	struct kinfo_proc *p, *plast;
164	int arg, ch, what;
165	char *memf, *nlistf;
166	int cnt;
167
168	arg = 0;
169	what = KERN_PROC_ALL;
170	nlistf = memf = NULL;
171	while ((ch = getopt(argc, argv, "fnp:u:vNM")) != EOF)
172		switch((char)ch) {
173		case 'f':
174			fsflg = 1;
175			break;
176		case 'M':
177			memf = optarg;
178			break;
179		case 'N':
180			nlistf = optarg;
181			break;
182		case 'n':
183			nflg = 1;
184			break;
185		case 'p':
186			if (pflg++)
187				usage();
188			if (!isdigit(*optarg)) {
189				fprintf(stderr,
190				    "fstat: -p requires a process id\n");
191				usage();
192			}
193			what = KERN_PROC_PID;
194			arg = atoi(optarg);
195			break;
196		case 'u':
197			if (uflg++)
198				usage();
199			if (!(passwd = getpwnam(optarg))) {
200				fprintf(stderr, "%s: unknown uid\n",
201				    optarg);
202				exit(1);
203			}
204			what = KERN_PROC_UID;
205			arg = passwd->pw_uid;
206			break;
207		case 'v':
208			vflg = 1;
209			break;
210		case '?':
211		default:
212			usage();
213		}
214
215	if (*(argv += optind)) {
216		for (; *argv; ++argv) {
217			if (getfname(*argv))
218				checkfile = 1;
219		}
220		if (!checkfile)	/* file(s) specified, but none accessable */
221			exit(1);
222	}
223
224	ALLOC_OFILES(256);	/* reserve space for file pointers */
225
226	if (fsflg && !checkfile) {
227		/* -f with no files means use wd */
228		if (getfname(".") == 0)
229			exit(1);
230		checkfile = 1;
231	}
232
233	/*
234	 * Discard setgid privileges if not the running kernel so that bad
235	 * guys can't print interesting stuff from kernel memory.
236	 */
237	if (nlistf != NULL || memf != NULL)
238		setgid(getgid());
239
240	if ((kd = kvm_open(nlistf, memf, NULL, O_RDONLY, NULL)) == NULL) {
241		fprintf(stderr, "fstat: %s\n", kvm_geterr(kd));
242		exit(1);
243	}
244#ifdef notdef
245	if (kvm_nlist(kd, nl) != 0) {
246		fprintf(stderr, "fstat: no namelist: %s\n", kvm_geterr(kd));
247		exit(1);
248	}
249#endif
250	if ((p = kvm_getprocs(kd, what, arg, &cnt)) == NULL) {
251		fprintf(stderr, "fstat: %s\n", kvm_geterr(kd));
252		exit(1);
253	}
254	if (nflg)
255		printf("%s",
256"USER     CMD          PID   FD  DEV    INUM       MODE SZ|DV R/W");
257	else
258		printf("%s",
259"USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W");
260	if (checkfile && fsflg == 0)
261		printf(" NAME\n");
262	else
263		putchar('\n');
264
265	for (plast = &p[cnt]; p < plast; ++p) {
266		if (p->kp_proc.p_stat == SZOMB)
267			continue;
268		dofiles(p);
269	}
270	exit(0);
271}
272
273char	*Uname, *Comm;
274int	Pid;
275
276#define PREFIX(i) printf("%-8.8s %-10s %5d", Uname, Comm, Pid); \
277	switch(i) { \
278	case TEXT: \
279		printf(" text"); \
280		break; \
281	case CDIR: \
282		printf("   wd"); \
283		break; \
284	case RDIR: \
285		printf(" root"); \
286		break; \
287	case TRACE: \
288		printf("   tr"); \
289		break; \
290	default: \
291		printf(" %4d", i); \
292		break; \
293	}
294
295/*
296 * print open files attributed to this process
297 */
298void
299dofiles(kp)
300	struct kinfo_proc *kp;
301{
302	int i, last;
303	struct file file;
304	struct filedesc0 filed0;
305#define	filed	filed0.fd_fd
306	struct proc *p = &kp->kp_proc;
307	struct eproc *ep = &kp->kp_eproc;
308
309	Uname = user_from_uid(ep->e_ucred.cr_uid, 0);
310	Pid = p->p_pid;
311	Comm = p->p_comm;
312
313	if (p->p_fd == NULL)
314		return;
315	if (!KVM_READ(p->p_fd, &filed0, sizeof (filed0))) {
316		dprintf(stderr, "can't read filedesc at %x for pid %d\n",
317			p->p_fd, Pid);
318		return;
319	}
320	/*
321	 * root directory vnode, if one
322	 */
323	if (filed.fd_rdir)
324		vtrans(filed.fd_rdir, RDIR, FREAD);
325	/*
326	 * current working directory vnode
327	 */
328	vtrans(filed.fd_cdir, CDIR, FREAD);
329	/*
330	 * ktrace vnode, if one
331	 */
332	if (p->p_tracep)
333		vtrans(p->p_tracep, TRACE, FREAD|FWRITE);
334	/*
335	 * open files
336	 */
337#define FPSIZE	(sizeof (struct file *))
338	ALLOC_OFILES(filed.fd_lastfile+1);
339	if (filed.fd_nfiles > NDFILE) {
340		if (!KVM_READ(filed.fd_ofiles, ofiles,
341		    (filed.fd_lastfile+1) * FPSIZE)) {
342			dprintf(stderr,
343			    "can't read file structures at %x for pid %d\n",
344			    filed.fd_ofiles, Pid);
345			return;
346		}
347	} else
348		bcopy(filed0.fd_dfiles, ofiles, (filed.fd_lastfile+1) * FPSIZE);
349	for (i = 0; i <= filed.fd_lastfile; i++) {
350		if (ofiles[i] == NULL)
351			continue;
352		if (!KVM_READ(ofiles[i], &file, sizeof (struct file))) {
353			dprintf(stderr, "can't read file %d at %x for pid %d\n",
354				i, ofiles[i], Pid);
355			continue;
356		}
357		if (file.f_type == DTYPE_VNODE)
358			vtrans((struct vnode *)file.f_data, i, file.f_flag);
359		else if (file.f_type == DTYPE_SOCKET) {
360			if (checkfile == 0)
361				socktrans((struct socket *)file.f_data, i);
362		}
363#ifdef DTYPE_PIPE
364		else if (file.f_type == DTYPE_PIPE) {
365			if (checkfile == 0)
366				pipetrans((struct pipe *)file.f_data, i,
367					file.f_flag);
368		}
369#endif
370		else {
371			dprintf(stderr,
372				"unknown file type %d for file %d of pid %d\n",
373				file.f_type, i, Pid);
374		}
375	}
376}
377
378void
379vtrans(vp, i, flag)
380	struct vnode *vp;
381	int i;
382	int flag;
383{
384	struct vnode vn;
385	struct filestat fst;
386	char rw[3], mode[15];
387	char *badtype = NULL, *filename, *getmnton();
388
389	filename = badtype = NULL;
390	if (!KVM_READ(vp, &vn, sizeof (struct vnode))) {
391		dprintf(stderr, "can't read vnode at %x for pid %d\n",
392			vp, Pid);
393		return;
394	}
395	if (vn.v_type == VNON || vn.v_tag == VT_NON)
396		badtype = "none";
397	else if (vn.v_type == VBAD)
398		badtype = "bad";
399	else
400		switch (vn.v_tag) {
401		case VT_UFS:
402			if (!ufs_filestat(&vn, &fst))
403				badtype = "error";
404			break;
405		case VT_MFS:
406			if (!ufs_filestat(&vn, &fst))
407				badtype = "error";
408			break;
409		case VT_NFS:
410			if (!nfs_filestat(&vn, &fst))
411				badtype = "error";
412			break;
413		default: {
414			static char unknown[10];
415			sprintf(badtype = unknown, "?(%x)", vn.v_tag);
416			break;;
417		}
418	}
419	if (checkfile) {
420		int fsmatch = 0;
421		register DEVS *d;
422
423		if (badtype)
424			return;
425		for (d = devs; d != NULL; d = d->next)
426			if (d->fsid == fst.fsid) {
427				fsmatch = 1;
428				if (d->ino == fst.fileid) {
429					filename = d->name;
430					break;
431				}
432			}
433		if (fsmatch == 0 || (filename == NULL && fsflg == 0))
434			return;
435	}
436	PREFIX(i);
437	if (badtype) {
438		(void)printf(" -         -  %10s    -\n", badtype);
439		return;
440	}
441	if (nflg)
442		(void)printf(" %2d,%-2d", major(fst.fsid), minor(fst.fsid));
443	else
444		(void)printf(" %-8s", getmnton(vn.v_mount));
445	if (nflg)
446		(void)sprintf(mode, "%o", fst.mode);
447	else
448		strmode(fst.mode, mode);
449	(void)printf(" %6d %10s", fst.fileid, mode);
450	switch (vn.v_type) {
451	case VBLK:
452	case VCHR: {
453		char *name;
454
455		if (nflg || ((name = devname(fst.rdev, vn.v_type == VCHR ?
456		    S_IFCHR : S_IFBLK)) == NULL))
457			printf("  %2d,%-2d", major(fst.rdev), minor(fst.rdev));
458		else
459			printf(" %6s", name);
460		break;
461	}
462	default:
463		printf(" %6d", fst.size);
464	}
465	rw[0] = '\0';
466	if (flag & FREAD)
467		strcat(rw, "r");
468	if (flag & FWRITE)
469		strcat(rw, "w");
470	printf(" %2s", rw);
471	if (filename && !fsflg)
472		printf("  %s", filename);
473	putchar('\n');
474}
475
476int
477ufs_filestat(vp, fsp)
478	struct vnode *vp;
479	struct filestat *fsp;
480{
481	struct inode inode;
482
483	if (!KVM_READ(VTOI(vp), &inode, sizeof (inode))) {
484		dprintf(stderr, "can't read inode at %x for pid %d\n",
485			VTOI(vp), Pid);
486		return 0;
487	}
488	fsp->fsid = inode.i_dev & 0xffff;
489	fsp->fileid = (long)inode.i_number;
490	fsp->mode = (mode_t)inode.i_mode;
491	fsp->size = (u_long)inode.i_size;
492	fsp->rdev = inode.i_rdev;
493
494	return 1;
495}
496
497int
498nfs_filestat(vp, fsp)
499	struct vnode *vp;
500	struct filestat *fsp;
501{
502	struct nfsnode nfsnode;
503	register mode_t mode;
504
505	if (!KVM_READ(VTONFS(vp), &nfsnode, sizeof (nfsnode))) {
506		dprintf(stderr, "can't read nfsnode at %x for pid %d\n",
507			VTONFS(vp), Pid);
508		return 0;
509	}
510	fsp->fsid = nfsnode.n_vattr.va_fsid;
511	fsp->fileid = nfsnode.n_vattr.va_fileid;
512	fsp->size = nfsnode.n_size;
513	fsp->rdev = nfsnode.n_vattr.va_rdev;
514	mode = (mode_t)nfsnode.n_vattr.va_mode;
515	switch (vp->v_type) {
516	case VREG:
517		mode |= S_IFREG;
518		break;
519	case VDIR:
520		mode |= S_IFDIR;
521		break;
522	case VBLK:
523		mode |= S_IFBLK;
524		break;
525	case VCHR:
526		mode |= S_IFCHR;
527		break;
528	case VLNK:
529		mode |= S_IFLNK;
530		break;
531	case VSOCK:
532		mode |= S_IFSOCK;
533		break;
534	case VFIFO:
535		mode |= S_IFIFO;
536		break;
537	};
538	fsp->mode = mode;
539
540	return 1;
541}
542
543
544char *
545getmnton(m)
546	struct mount *m;
547{
548	static struct mount mount;
549	static struct mtab {
550		struct mtab *next;
551		struct mount *m;
552		char mntonname[MNAMELEN];
553	} *mhead = NULL;
554	register struct mtab *mt;
555
556	for (mt = mhead; mt != NULL; mt = mt->next)
557		if (m == mt->m)
558			return (mt->mntonname);
559	if (!KVM_READ(m, &mount, sizeof(struct mount))) {
560		fprintf(stderr, "can't read mount table at %x\n", m);
561		return (NULL);
562	}
563	if ((mt = malloc(sizeof (struct mtab))) == NULL) {
564		fprintf(stderr, "fstat: %s\n", strerror(errno));
565		exit(1);
566	}
567	mt->m = m;
568	bcopy(&mount.mnt_stat.f_mntonname[0], &mt->mntonname[0], MNAMELEN);
569	mt->next = mhead;
570	mhead = mt;
571	return (mt->mntonname);
572}
573
574void
575pipetrans(pi, i, flag)
576	struct pipe *pi;
577	int i;
578	int flag;
579{
580	struct pipe pip;
581	char rw[3];
582
583	PREFIX(i);
584
585	/* fill in socket */
586	if (!KVM_READ(pi, &pip, sizeof(struct pipe))) {
587		dprintf(stderr, "can't read pipe at %x\n", pi);
588		goto bad;
589	}
590
591	printf("* pipe %8x <-> %8x", (int)pi, (int)pip.pipe_peer);
592	printf(" %6d", (int)pip.pipe_buffer.cnt);
593	rw[0] = '\0';
594	if (flag & FREAD)
595		strcat(rw, "r");
596	if (flag & FWRITE)
597		strcat(rw, "w");
598	printf(" %2s", rw);
599	putchar('\n');
600	return;
601
602bad:
603	printf("* error\n");
604}
605
606void
607socktrans(sock, i)
608	struct socket *sock;
609	int i;
610{
611	static char *stypename[] = {
612		"unused",	/* 0 */
613		"stream", 	/* 1 */
614		"dgram",	/* 2 */
615		"raw",		/* 3 */
616		"rdm",		/* 4 */
617		"seqpak"	/* 5 */
618	};
619#define	STYPEMAX 5
620	struct socket	so;
621	struct protosw	proto;
622	struct domain	dom;
623	struct inpcb	inpcb;
624	struct unpcb	unpcb;
625	int len;
626	char dname[32], *strcpy();
627
628	PREFIX(i);
629
630	/* fill in socket */
631	if (!KVM_READ(sock, &so, sizeof(struct socket))) {
632		dprintf(stderr, "can't read sock at %x\n", sock);
633		goto bad;
634	}
635
636	/* fill in protosw entry */
637	if (!KVM_READ(so.so_proto, &proto, sizeof(struct protosw))) {
638		dprintf(stderr, "can't read protosw at %x", so.so_proto);
639		goto bad;
640	}
641
642	/* fill in domain */
643	if (!KVM_READ(proto.pr_domain, &dom, sizeof(struct domain))) {
644		dprintf(stderr, "can't read domain at %x\n", proto.pr_domain);
645		goto bad;
646	}
647
648	if ((len = kvm_read(kd, (u_long)dom.dom_name, dname,
649	    sizeof(dname) - 1)) < 0) {
650		dprintf(stderr, "can't read domain name at %x\n",
651			dom.dom_name);
652		dname[0] = '\0';
653	}
654	else
655		dname[len] = '\0';
656
657	if ((u_short)so.so_type > STYPEMAX)
658		printf("* %s ?%d", dname, so.so_type);
659	else
660		printf("* %s %s", dname, stypename[so.so_type]);
661
662	/*
663	 * protocol specific formatting
664	 *
665	 * Try to find interesting things to print.  For tcp, the interesting
666	 * thing is the address of the tcpcb, for udp and others, just the
667	 * inpcb (socket pcb).  For unix domain, its the address of the socket
668	 * pcb and the address of the connected pcb (if connected).  Otherwise
669	 * just print the protocol number and address of the socket itself.
670	 * The idea is not to duplicate netstat, but to make available enough
671	 * information for further analysis.
672	 */
673	switch(dom.dom_family) {
674	case AF_INET:
675		getinetproto(proto.pr_protocol);
676		if (proto.pr_protocol == IPPROTO_TCP ) {
677			if (so.so_pcb) {
678				if (kvm_read(kd, (u_long)so.so_pcb,
679				    (char *)&inpcb, sizeof(struct inpcb))
680				    != sizeof(struct inpcb)) {
681					dprintf(stderr,
682					    "can't read inpcb at %x\n",
683					    so.so_pcb);
684					goto bad;
685				}
686				printf(" %x", (int)inpcb.inp_ppcb);
687			}
688		}
689		else if (so.so_pcb)
690			printf(" %x", (int)so.so_pcb);
691		break;
692	case AF_UNIX:
693		/* print address of pcb and connected pcb */
694		if (so.so_pcb) {
695			printf(" %x", (int)so.so_pcb);
696			if (kvm_read(kd, (u_long)so.so_pcb, (char *)&unpcb,
697			    sizeof(struct unpcb)) != sizeof(struct unpcb)){
698				dprintf(stderr, "can't read unpcb at %x\n",
699				    so.so_pcb);
700				goto bad;
701			}
702			if (unpcb.unp_conn) {
703				char shoconn[4], *cp;
704
705				cp = shoconn;
706				if (!(so.so_state & SS_CANTRCVMORE))
707					*cp++ = '<';
708				*cp++ = '-';
709				if (!(so.so_state & SS_CANTSENDMORE))
710					*cp++ = '>';
711				*cp = '\0';
712				printf(" %s %x", shoconn,
713				    (int)unpcb.unp_conn);
714			}
715		}
716		break;
717	default:
718		/* print protocol number and socket address */
719		printf(" %d %x", proto.pr_protocol, (int)sock);
720	}
721	printf("\n");
722	return;
723bad:
724	printf("* error\n");
725}
726
727/*
728 * getinetproto --
729 *	print name of protocol number
730 */
731void
732getinetproto(number)
733	int number;
734{
735	char *cp;
736
737	switch(number) {
738	case IPPROTO_IP:
739		cp = "ip"; break;
740	case IPPROTO_ICMP:
741		cp ="icmp"; break;
742	case IPPROTO_GGP:
743		cp ="ggp"; break;
744	case IPPROTO_TCP:
745		cp ="tcp"; break;
746	case IPPROTO_EGP:
747		cp ="egp"; break;
748	case IPPROTO_PUP:
749		cp ="pup"; break;
750	case IPPROTO_UDP:
751		cp ="udp"; break;
752	case IPPROTO_IDP:
753		cp ="idp"; break;
754	case IPPROTO_RAW:
755		cp ="raw"; break;
756	default:
757		printf(" %d", number);
758		return;
759	}
760	printf(" %s", cp);
761}
762
763int
764getfname(filename)
765	char *filename;
766{
767	struct stat statbuf;
768	DEVS *cur;
769
770	if (stat(filename, &statbuf)) {
771		fprintf(stderr, "fstat: %s: %s\n", filename, strerror(errno));
772		return(0);
773	}
774	if ((cur = malloc(sizeof(DEVS))) == NULL) {
775		fprintf(stderr, "fstat: %s\n", strerror(errno));
776		exit(1);
777	}
778	cur->next = devs;
779	devs = cur;
780
781	cur->ino = statbuf.st_ino;
782	cur->fsid = statbuf.st_dev & 0xffff;
783	cur->name = filename;
784	return(1);
785}
786
787void
788usage()
789{
790	(void)fprintf(stderr,
791 "usage: fstat [-fnv] [-p pid] [-u user] [-N system] [-M core] [file ...]\n");
792	exit(1);
793}
794