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Hands-off reading for FLAC.
[disorder] / server / mount.c
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RK
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_) {
44#if HAVE_GETFSSTAT
45 /* On OS X, we keep track of the hash of the kernel's mounted
46 * filesystem list */
47 static int first = 1;
48 static unsigned char last[20];
49 unsigned char *current;
50 int nfilesystems, space;
51 struct statfs *buf;
52 gcrypt_hash_handle h;
53 gcry_error_t e;
54
55 space = getfsstat(NULL, 0, MNT_NOWAIT);
56 buf = xcalloc(space, sizeof *buf);
57 nfilesystems = getfsstat(buf, space * sizeof *buf, MNT_NOWAIT);
58 if(nfilesystems > space)
59 // The array grew between check and use! We just give up and try later.
60 return;
61 // Put into order so we get a bit of consistency
62 qsort(buf, nfilesystems, sizeof *buf, compare_fsstat);
63 if((e = gcry_md_open(&h, GCRY_MD_SHA1, 0))) {
64 disorder_error(0, "gcry_md_open: %s", gcry_strerror(e));
65 return;
66 }
67 for(int n = 0; n < nfilesystems; ++n) {
68 gcry_md_write(h, &buf[n].f_fsid, sizeof buf[n].f_fsid);
69 gcry_md_write(h, buf[n].f_mntonname, 1 + strlen(buf[n].f_mntonname));
70 }
71 current = gcry_md_read(h, GCRY_MD_SHA1);
72 if(!first && memcmp(current, last, sizeof last))
73 trackdb_rescan(ev_, 1/*check*/, 0, 0);
74 memcpy(last, current, sizeof last);
75 first = 0;
498b46a2 76 gcry_md_close(h);
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77#elif defined PATH_MTAB
78 /* On Linux we keep track of the modification time of /etc/mtab */
79 static time_t last_mount;
80 struct stat sb;
81
82 if(stat(PATH_MTAB, &sb) >= 0) {
83 if(last_mount != 0 && last_mount != sb.st_mtime)
84 trackdb_rescan(ev_, 1/*check*/, 0, 0);
85 last_mount = sb.st_mtime;
86 }
87#endif
88}
89
90/*
91Local Variables:
92c-basic-offset:2
93comment-column:40
94fill-column:79
95indent-tabs-mode:nil
96End:
97*/