]>
Commit | Line | Data |
---|---|---|
d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
a16e1123 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
a16e1123 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
a16e1123 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
a16e1123 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <dirent.h> | |
24 | #include <fcntl.h> | |
25 | #include <unistd.h> | |
26 | ||
27 | #include "set.h" | |
28 | #include "util.h" | |
29 | #include "macro.h" | |
30 | #include "fdset.h" | |
e83c7163 | 31 | #include "sd-daemon.h" |
a16e1123 LP |
32 | |
33 | #define MAKE_SET(s) ((Set*) s) | |
34 | #define MAKE_FDSET(s) ((FDSet*) s) | |
35 | ||
36 | /* Make sure we can distuingish fd 0 and NULL */ | |
37 | #define FD_TO_PTR(fd) INT_TO_PTR((fd)+1) | |
38 | #define PTR_TO_FD(p) (PTR_TO_INT(p)-1) | |
39 | ||
40 | FDSet *fdset_new(void) { | |
41 | return MAKE_FDSET(set_new(trivial_hash_func, trivial_compare_func)); | |
42 | } | |
43 | ||
44 | void fdset_free(FDSet *s) { | |
45 | void *p; | |
46 | ||
47 | while ((p = set_steal_first(MAKE_SET(s)))) { | |
48 | /* Valgrind's fd might have ended up in this set here, | |
49 | * due to fdset_new_fill(). We'll ignore all failures | |
50 | * here, so that the EBADFD that valgrind will return | |
51 | * us on close() doesn't influence us */ | |
52 | ||
a7556052 LP |
53 | /* When reloading duplicates of the private bus |
54 | * connection fds and suchlike are closed here, which | |
55 | * has no effect at all, since they are only | |
56 | * duplicates. So don't be surprised about these log | |
57 | * messages. */ | |
58 | ||
b23de6af | 59 | log_debug("Closing left-over fd %i", PTR_TO_FD(p)); |
a16e1123 LP |
60 | close_nointr(PTR_TO_FD(p)); |
61 | } | |
62 | ||
63 | set_free(MAKE_SET(s)); | |
64 | } | |
65 | ||
66 | int fdset_put(FDSet *s, int fd) { | |
67 | assert(s); | |
68 | assert(fd >= 0); | |
69 | ||
70 | return set_put(MAKE_SET(s), FD_TO_PTR(fd)); | |
71 | } | |
72 | ||
73 | int fdset_put_dup(FDSet *s, int fd) { | |
74 | int copy, r; | |
75 | ||
76 | assert(s); | |
77 | assert(fd >= 0); | |
78 | ||
e83c7163 LP |
79 | copy = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
80 | if (copy < 0) | |
a16e1123 LP |
81 | return -errno; |
82 | ||
e83c7163 LP |
83 | r = fdset_put(s, copy); |
84 | if (r < 0) { | |
03e334a1 | 85 | safe_close(copy); |
a16e1123 LP |
86 | return r; |
87 | } | |
88 | ||
89 | return copy; | |
90 | } | |
91 | ||
92 | bool fdset_contains(FDSet *s, int fd) { | |
93 | assert(s); | |
94 | assert(fd >= 0); | |
95 | ||
96 | return !!set_get(MAKE_SET(s), FD_TO_PTR(fd)); | |
97 | } | |
98 | ||
99 | int fdset_remove(FDSet *s, int fd) { | |
100 | assert(s); | |
101 | assert(fd >= 0); | |
102 | ||
103 | return set_remove(MAKE_SET(s), FD_TO_PTR(fd)) ? fd : -ENOENT; | |
104 | } | |
105 | ||
106 | int fdset_new_fill(FDSet **_s) { | |
107 | DIR *d; | |
108 | struct dirent *de; | |
109 | int r = 0; | |
110 | FDSet *s; | |
111 | ||
112 | assert(_s); | |
113 | ||
e83c7163 | 114 | /* Creates an fdset and fills in all currently open file |
a16e1123 LP |
115 | * descriptors. */ |
116 | ||
e83c7163 LP |
117 | d = opendir("/proc/self/fd"); |
118 | if (!d) | |
a16e1123 LP |
119 | return -errno; |
120 | ||
e83c7163 LP |
121 | s = fdset_new(); |
122 | if (!s) { | |
a16e1123 LP |
123 | r = -ENOMEM; |
124 | goto finish; | |
125 | } | |
126 | ||
127 | while ((de = readdir(d))) { | |
128 | int fd = -1; | |
129 | ||
130 | if (ignore_file(de->d_name)) | |
131 | continue; | |
132 | ||
e83c7163 LP |
133 | r = safe_atoi(de->d_name, &fd); |
134 | if (r < 0) | |
a16e1123 LP |
135 | goto finish; |
136 | ||
137 | if (fd < 3) | |
138 | continue; | |
139 | ||
140 | if (fd == dirfd(d)) | |
141 | continue; | |
142 | ||
e83c7163 LP |
143 | r = fdset_put(s, fd); |
144 | if (r < 0) | |
a16e1123 LP |
145 | goto finish; |
146 | } | |
147 | ||
148 | r = 0; | |
149 | *_s = s; | |
150 | s = NULL; | |
151 | ||
152 | finish: | |
153 | closedir(d); | |
154 | ||
155 | /* We won't close the fds here! */ | |
156 | if (s) | |
157 | set_free(MAKE_SET(s)); | |
158 | ||
159 | return r; | |
a16e1123 LP |
160 | } |
161 | ||
162 | int fdset_cloexec(FDSet *fds, bool b) { | |
163 | Iterator i; | |
164 | void *p; | |
165 | int r; | |
166 | ||
167 | assert(fds); | |
168 | ||
169 | SET_FOREACH(p, MAKE_SET(fds), i) | |
170 | if ((r = fd_cloexec(PTR_TO_FD(p), b)) < 0) | |
171 | return r; | |
172 | ||
173 | return 0; | |
174 | } | |
e83c7163 LP |
175 | |
176 | int fdset_new_listen_fds(FDSet **_s, bool unset) { | |
177 | int n, fd, r; | |
178 | FDSet *s; | |
179 | ||
180 | assert(_s); | |
181 | ||
182 | /* Creates an fdset and fills in all passed file descriptors */ | |
183 | ||
184 | s = fdset_new(); | |
185 | if (!s) { | |
186 | r = -ENOMEM; | |
187 | goto fail; | |
188 | } | |
189 | ||
190 | n = sd_listen_fds(unset); | |
191 | for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++) { | |
192 | r = fdset_put(s, fd); | |
193 | if (r < 0) | |
194 | goto fail; | |
195 | } | |
196 | ||
197 | *_s = s; | |
198 | return 0; | |
199 | ||
200 | ||
201 | fail: | |
202 | if (s) | |
203 | set_free(MAKE_SET(s)); | |
204 | ||
205 | return r; | |
206 | } | |
207 | ||
208 | int fdset_close_others(FDSet *fds) { | |
209 | void *e; | |
210 | Iterator i; | |
211 | int *a; | |
212 | unsigned j, m; | |
213 | ||
214 | j = 0, m = fdset_size(fds); | |
215 | a = alloca(sizeof(int) * m); | |
216 | SET_FOREACH(e, MAKE_SET(fds), i) | |
217 | a[j++] = PTR_TO_FD(e); | |
218 | ||
219 | assert(j == m); | |
220 | ||
221 | return close_all_fds(a, j); | |
222 | } | |
223 | ||
224 | unsigned fdset_size(FDSet *fds) { | |
225 | return set_size(MAKE_SET(fds)); | |
226 | } | |
227 | ||
228 | int fdset_iterate(FDSet *s, Iterator *i) { | |
229 | void *p; | |
230 | ||
231 | p = set_iterate(MAKE_SET(s), i); | |
232 | if (!p) | |
233 | return -ENOENT; | |
234 | ||
235 | return PTR_TO_FD(p); | |
236 | } |