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/*
* rmnt.c -- readmnt() function for lsof library
*/
/*
* Copyright 1997 Purdue Research Foundation, West Lafayette, Indiana
* 47907. All rights reserved.
*
* Written by Victor A. Abell
*
* This software is not subject to any license of the American Telephone
* and Telegraph Company or the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on
* any computer system, and to alter it and redistribute it freely, subject
* to the following restrictions:
*
* 1. Neither the authors nor Purdue University are responsible for any
* consequences of the use of this software.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Credit to the authors and Purdue
* University must appear in documentation and sources.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 4. This notice may not be removed or altered.
*/
#include "../machine.h"
#if defined(USE_LIB_READMNT)
# if !defined(lint)
static char copyright[] =
"@(#) Copyright 1997 Purdue Research Foundation.\nAll rights reserved.\n";
static char *rcsid = "$Id: rmnt.c,v 1.12 2008/10/21 16:13:23 abe Exp $";
# endif /* !defined(lint) */
#include "../lsof.h"
/*
* The caller may define:
*
* 1. An RMNT_EXPDEV macro to expand (ala EP/IX) device numbers;
*
* EP/IX, for example, uses:
*
* #define RMNT_EXPDEV(n) expdev(n)
*
* 2. A custom macro, MNTSKIP, for making decisions to skip entries
* -- e.g., ones whose mnt_type is MNTTYPE_IGNORE.
*
* 3. RMNT_FSTYPE to specify the member name of the character string of the
* mntent structure containing the file system type, and MOUNTS_FSTYPE to
* specify the member name of the character string pointer of the local
* mounts structure where RMNT_FSTYPE is to be copied.
*
* 4. RMNT_STAT_FSTYPE to specify the member name of the stat structure
* containing an integer file system type, and MOUNTS_STAT_FSTYPE to
* specify the member name of the integer in the local mounts structure
* where RMNT_STAT_FSTYPE is to be copied.
*
*/
#if !defined(RMNT_EXPDEV)
#define RMNT_EXPDEV(n) n
#endif /* !defined(RMNT_EXPDEV) */
/*
* Local static definitions
*/
static struct mounts *Lmi = (struct mounts *)NULL; /* local mount info */
static int Lmist = 0; /* Lmi status */
/*
* readmnt() - read mount table
*/
struct mounts *
readmnt()
{
char *dn = (char *)NULL;
char *ln;
FILE *mfp;
struct mntent *mp;
struct mounts *mtp;
char *opt, *opte;
struct stat sb;
if (Lmi || Lmist)
return(Lmi);
/*
* Open access to the mount table.
*/
if (!(mfp = setmntent(MOUNTED, "r"))) {
(void) fprintf(stderr, "%s: can't access %s\n", Pn, MOUNTED);
Exit(1);
}
/*
* Read mount table entries.
*/
while ((mp = getmntent(mfp))) {
#if defined(MNTSKIP)
/*
* Specfy in the MNTSKIP macro the decisions needed to determine
* that this entry should be skipped.
*
* Typically entries whose mnt_type is MNTTYPE_IGNORE are skipped.
*
* The MNTSKIP macro allows the caller to use other tests.
*/
MNTSKIP
#endif /* MNTSKIP */
/*
* Interpolate a possible symbolic directory link.
*/
if (dn)
(void) free((FREE_P *)dn);
if (!(dn = mkstrcpy(mp->mnt_dir, (MALLOC_S *)NULL)))
goto no_space_for_mount;
if (!(ln = Readlink(dn))) {
if (!Fwarn)
(void) fprintf(stderr,
" Output information may be incomplete.\n");
continue;
}
if (ln != dn) {
(void) free((FREE_P *)dn);
dn = ln;
}
if (*dn != '/')
continue;
/*
* Stat() the directory.
*/
if (statsafely(dn, &sb)) {
if (!Fwarn) {
(void) fprintf(stderr, "%s: WARNING: can't stat() ", Pn);
safestrprt(mp->mnt_type, stderr, 0);
(void) fprintf(stderr, " file system ");
safestrprt(mp->mnt_dir, stderr, 1);
(void) fprintf(stderr,
" Output information may be incomplete.\n");
}
if ((opt = strstr(mp->mnt_opts, "dev="))) {
(void) zeromem(&sb, sizeof(sb));
if ((opte = x2dev(opt + 4, (dev_t *)&sb.st_dev))) {
sb.st_mode = S_IFDIR | 0777;
if (!Fwarn)
(void) fprintf(stderr,
" assuming \"%.*s\" from %s\n",
(int)(opte - opt), opt, MOUNTED);
} else
opt = (char *)NULL;
}
if (!opt)
continue;
}
/*
* Allocate and fill a local mounts structure with the directory
* (mounted) information.
*/
if (!(mtp = (struct mounts *)malloc(sizeof(struct mounts)))) {
no_space_for_mount:
(void) fprintf(stderr, "%s: no space for mount at ", Pn);
safestrprt(mp->mnt_fsname, stderr, 0);
(void) fprintf(stderr, " (");
safestrprt(mp->mnt_dir, stderr, 0);
(void) fprintf(stderr, ")\n");
Exit(1);
}
mtp->dir = dn;
dn = (char *)NULL;
mtp->next = Lmi;
mtp->dev = RMNT_EXPDEV(sb.st_dev);
mtp->rdev = RMNT_EXPDEV(sb.st_rdev);
mtp->inode = (INODETYPE)sb.st_ino;
mtp->mode = sb.st_mode;
# if defined(RMNT_FSTYPE) && defined(MOUNTS_FSTYPE)
/*
* Make a copy of RMNT_FSTYPE in MOUNTS_FSTYPE.
*/
if (!(mtp->MOUNTS_FSTYPE = mkstrcpy(mp->RMNT_FSTYPE,
(MALLOC_S *)NULL)))
{
(void) fprintf(stderr, "%s: no space for fstype (%s): %s\n",
Pn, mtp->dir, mp->RMNT_FSTYPE);
Exit(1);
}
(void) strcpy(mtp->MOUNTS_FSTYPE, mp->RMNT_FSTYPE);
# endif /* defined(RMNT_FSTYP) && defined(MOUNTS_FSTYP) */
# if defined(RMNT_STAT_FSTYPE) && defined(MOUNTS_STAT_FSTYPE)
/*
* Make a copy of RMNT_STAT_FSTYPE in MOUNTS_STAT_FSTYPE.
*/
mtp->MOUNTS_STAT_FSTYPE = (int)sb.RMNT_STAT_FSTYPE;
# endif /* defined(RMNT_STAT_FSTYP) && defined(MOUNTS_STAT_FSTYP) */
/*
* Interpolate a possible file system (mounted-on device) name link.
*/
if (!(dn = mkstrcpy(mp->mnt_fsname, (MALLOC_S *)NULL)))
goto no_space_for_mount;
mtp->fsname = dn;
ln = Readlink(dn);
dn = (char *)NULL;
/*
* Stat() the file system (mounted-on) name and add file system
* information to the local mounts structure.
*/
if (!ln || statsafely(ln, &sb))
sb.st_mode = 0;
mtp->fsnmres = ln;
mtp->fs_mode = sb.st_mode;
Lmi = mtp;
}
(void) endmntent(mfp);
/*
* Clean up and return the local nount info table address.
*/
if (dn)
(void) free((FREE_P *)dn);
Lmist = 1;
return(Lmi);
}
#else /* !defined(USE_LIB_READMNT) */
char rmnt_d1[] = "d"; char *rmnt_d2 = rmnt_d1;
#endif /* defined(USE_LIB_READMNT) */
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