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annotate lib/getmountlist.c @ 1433:00c20f410c46 draft

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Patches to commands for issues reported from static analysis tool. portability.h.patch - it is for O_CLOEXEC, as compiler complained of it. Makefile.patch - for cleaning generated/*.o files and libopts.dat file [Fixup to uniq.c from Rob.]
author Ashwini Sharma <ak.ashwini1981@gmail.com>
date Tue, 12 Aug 2014 07:09:01 -0500
parents 4d898affda0c
children 487716951287
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1 /* getmountlist.c - Get a linked list of mount points, with stat information.
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2 *
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3 * Copyright 2006 Rob Landley <rob@landley.net>
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4 */
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6 #include "toys.h"
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7 #include <mntent.h>
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9 // Get list of mounted filesystems, including stat and statvfs info.
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10 // Returns a reversed list, which is good for finding overmounts and such.
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12 struct mtab_list *xgetmountlist(char *path)
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13 {
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14 struct mtab_list *mtlist = 0, *mt;
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15 struct mntent *me;
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16 FILE *fp;
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17 char *p = path ? path : "/proc/mounts";
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19 if (!(fp = setmntent(p, "r"))) perror_exit("bad %s", p);
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21 // The "test" part of the loop is done before the first time through and
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22 // again after each "increment", so putting the actual load there avoids
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23 // duplicating it. If the load was NULL, the loop stops.
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25 while ((me = getmntent(fp))) {
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26 mt = xzalloc(sizeof(struct mtab_list) + strlen(me->mnt_fsname) +
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27 strlen(me->mnt_dir) + strlen(me->mnt_type) + strlen(me->mnt_opts) + 4);
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28 dlist_add_nomalloc((void *)&mtlist, (void *)mt);
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30 // Collect details about mounted filesystem
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31 // Don't report errors, just leave data zeroed
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32 if (!path) {
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33 stat(me->mnt_dir, &(mt->stat));
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34 statvfs(me->mnt_dir, &(mt->statvfs));
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35 }
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37 // Remember information from /proc/mounts
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38 mt->dir = stpcpy(mt->type, me->mnt_type)+1;
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39 mt->device = stpcpy(mt->dir, me->mnt_dir)+1;
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40 mt->opts = stpcpy(mt->device, me->mnt_fsname)+1;
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41 strcpy(mt->opts, me->mnt_opts);
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42 }
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43 endmntent(fp);
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45 return mtlist;
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46 }