chiark / gitweb /
Fix a few of the things the Clang static analyzer detects:
[disorder] / server / mount.c
CommitLineData
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1/*
2 * This file is part of DisOrder.
3 * Copyright (C) 2010 Richard Kettlewell
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18/** @file server/mount.c
19 * @brief Periodically check for devices being mounted and unmounted
20 */
21#include "disorder-server.h"
22#if HAVE_GETFSSTAT
23# include <sys/param.h>
24# include <sys/ucred.h>
25# include <sys/mount.h>
26#endif
27
28#if HAVE_GETFSSTAT
29static int compare_fsstat(const void *av, const void *bv) {
30 const struct statfs *a = av, *b = bv;
31 int c;
32
33 c = memcmp(&a->f_fsid, &b->f_fsid, sizeof a->f_fsid);
34 if(c)
35 return c;
36 c = strcmp(a->f_mntonname, b->f_mntonname);
37 if(c)
38 return c;
39 return 0;
40}
41#endif
42
43void periodic_mount_check(ev_source *ev_) {
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44 if(!config->mount_rescan)
45 return;
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46#if HAVE_GETFSSTAT
47 /* On OS X, we keep track of the hash of the kernel's mounted
48 * filesystem list */
49 static int first = 1;
50 static unsigned char last[20];
51 unsigned char *current;
52 int nfilesystems, space;
53 struct statfs *buf;
54 gcrypt_hash_handle h;
55 gcry_error_t e;
56
57 space = getfsstat(NULL, 0, MNT_NOWAIT);
58 buf = xcalloc(space, sizeof *buf);
59 nfilesystems = getfsstat(buf, space * sizeof *buf, MNT_NOWAIT);
60 if(nfilesystems > space)
61 // The array grew between check and use! We just give up and try later.
62 return;
63 // Put into order so we get a bit of consistency
64 qsort(buf, nfilesystems, sizeof *buf, compare_fsstat);
65 if((e = gcry_md_open(&h, GCRY_MD_SHA1, 0))) {
66 disorder_error(0, "gcry_md_open: %s", gcry_strerror(e));
67 return;
68 }
69 for(int n = 0; n < nfilesystems; ++n) {
70 gcry_md_write(h, &buf[n].f_fsid, sizeof buf[n].f_fsid);
71 gcry_md_write(h, buf[n].f_mntonname, 1 + strlen(buf[n].f_mntonname));
72 }
73 current = gcry_md_read(h, GCRY_MD_SHA1);
74 if(!first && memcmp(current, last, sizeof last))
75 trackdb_rescan(ev_, 1/*check*/, 0, 0);
76 memcpy(last, current, sizeof last);
77 first = 0;
498b46a2 78 gcry_md_close(h);
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79#elif defined PATH_MTAB
80 /* On Linux we keep track of the modification time of /etc/mtab */
81 static time_t last_mount;
82 struct stat sb;
83
84 if(stat(PATH_MTAB, &sb) >= 0) {
85 if(last_mount != 0 && last_mount != sb.st_mtime)
86 trackdb_rescan(ev_, 1/*check*/, 0, 0);
87 last_mount = sb.st_mtime;
88 }
89#endif
90}
91
92/*
93Local Variables:
94c-basic-offset:2
95comment-column:40
96fill-column:79
97indent-tabs-mode:nil
98End:
99*/