diff options
Diffstat (limited to 'lib/rmnt.c')
-rw-r--r-- | lib/rmnt.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/lib/rmnt.c b/lib/rmnt.c new file mode 100644 index 0000000..0e1470f --- /dev/null +++ b/lib/rmnt.c @@ -0,0 +1,243 @@ +/* + * 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) */ |