1/*
2 * pdvn.c -- print device name functions for lsof library
3 */
4
5
6/*
7 * Copyright 1997 Purdue Research Foundation, West Lafayette, Indiana
8 * 47907.  All rights reserved.
9 *
10 * Written by Victor A. Abell
11 *
12 * This software is not subject to any license of the American Telephone
13 * and Telegraph Company or the Regents of the University of California.
14 *
15 * Permission is granted to anyone to use this software for any purpose on
16 * any computer system, and to alter it and redistribute it freely, subject
17 * to the following restrictions:
18 *
19 * 1. Neither the authors nor Purdue University are responsible for any
20 *    consequences of the use of this software.
21 *
22 * 2. The origin of this software must not be misrepresented, either by
23 *    explicit claim or by omission.  Credit to the authors and Purdue
24 *    University must appear in documentation and sources.
25 *
26 * 3. Altered versions must be plainly marked as such, and must not be
27 *    misrepresented as being the original software.
28 *
29 * 4. This notice may not be removed or altered.
30 */
31
32
33#include "../machine.h"
34
35#if	defined(USE_LIB_PRINTDEVNAME)
36
37# if	!defined(lint)
38static char copyright[] =
39"@(#) Copyright 1997 Purdue Research Foundation.\nAll rights reserved.\n";
40static char *rcsid = "$Id: pdvn.c,v 1.8 2008/10/21 16:12:36 abe Exp $";
41# endif	/* !defined(lint) */
42
43#include "../lsof.h"
44
45#else	/* !defined(USE_LIB_PRINTDEVNAME) */
46char pdvn_d1[] = "d"; char *pdvn_d2 = pdvn_d1;
47#endif	/* defined(USE_LIB_PRINTDEVNAME) */
48
49
50/*
51 * To use this source file:
52 *
53 * 1. Define USE_LIB_PRINTDEVNAME, or both.
54 *
55 * 2. Define HAS_STD_CLONE to enable standard clone searches in
56 *    printdevname().
57 *
58 * 3. Define HASBLDKDEV to enable block device processing.
59 */
60
61
62/*
63 * Local definitions
64 */
65
66#define	LIKE_BLK_SPEC	"like block special"
67#define	LIKE_CHR_SPEC	"like character special"
68
69
70# if	defined(USE_LIB_PRINTDEVNAME)
71/*
72 * printdevname() - print block or character device name
73 */
74
75int
76printdevname(dev, rdev, f, nty)
77	dev_t *dev;			/* device */
78	dev_t *rdev;			/* raw device */
79	int f;				/* 1 = print trailing '\n' */
80	int nty;			/* node type: N_BLK or N_CHR */
81{
82
83#  if	defined(HAS_STD_CLONE)
84	struct clone *c;
85#  endif	/* defined(HAS_STD_CLONE) */
86
87	struct l_dev *dp;
88	int r = 1;
89
90#  if	defined(HASDCACHE)
91
92printdevname_again:
93
94#  endif	/* defined(HASDCACHE) */
95
96# if	defined(HAS_STD_CLONE)
97/*
98 * Search for clone if this is a character device on the same device as
99 * /dev (or /devices).
100 */
101	if ((nty == N_CHR) && Lf->is_stream && Clone && (*dev == DevDev)) {
102	    r = 0;	/* Don't let lkupdev() rebuild the device cache,
103			 * because when it has been rebuilt we want to
104			 * search again for clones. */
105	    readdev(0);
106	    for (c = Clone; c; c = c->next) {
107		if (GET_MAJ_DEV(*rdev) == GET_MIN_DEV(Devtp[c->dx].rdev)) {
108
109#  if	defined(HASDCACHE)
110		    if (DCunsafe && !Devtp[c->dx].v && !vfy_dev(&Devtp[c->dx]))
111			goto printdevname_again;
112#  endif	/* defined(HASDCACHE) */
113
114		    safestrprt(Devtp[c->dx].name, stdout, f);
115		    return(1);
116		}
117	    }
118	}
119# endif	/* defined(HAS_STD_CLONE) */
120
121/*
122 * Search appropriate device table for a full match.
123 */
124
125# if	defined(HASBLKDEV)
126	if (nty == N_BLK)
127	    dp = lkupbdev(dev, rdev, 1, r);
128	else
129# endif	/* defined(HASBLKDEV) */
130
131	dp = lkupdev(dev, rdev, 1, r);
132	if (dp) {
133	    safestrprt(dp->name, stdout, f);
134	    return(1);
135	}
136/*
137 * Search device table for a match without inode number and dev.
138 */
139
140# if	defined(HASBLKDEV)
141	if (nty == N_BLK)
142	    dp = lkupbdev(&DevDev, rdev, 0, r);
143	else
144# endif	/* defined(HASBLKDEV) */
145
146	dp = lkupdev(&DevDev, rdev, 0, r);
147	if (dp) {
148	/*
149	 * A match was found.  Record it as a name column addition.
150	 */
151	    char *cp, *ttl;
152	    int len;
153
154	    ttl = (nty == N_BLK) ? LIKE_BLK_SPEC : LIKE_CHR_SPEC;
155	    len = (int)(1 + strlen(ttl) + 1 + strlen(dp->name) + 1);
156	    if (!(cp = (char *)malloc((MALLOC_S)(len + 1)))) {
157		(void) fprintf(stderr, "%s: no nma space for: (%s %s)\n",
158		    Pn, ttl, dp->name);
159		Exit(1);
160	    }
161	    (void) snpf(cp, len + 1, "(%s %s)", ttl, dp->name);
162	    (void) add_nma(cp, len);
163	    (void) free((MALLOC_P *)cp);
164	    return(0);
165	}
166
167# if	defined(HASDCACHE)
168/*
169 * We haven't found a match.
170 *
171 * If rebuilding the device cache was suppressed and the device cache is
172 * "unsafe," rebuild it.
173 */
174	if (!r && DCunsafe) {
175	    (void) rereaddev();
176	    goto printdevname_again;
177	}
178# endif	/* defined(HASDCACHE) */
179
180	return(0);
181}
182#endif	/* defined(USE_LIB_PRINTDEVNAME) */
183