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git.ipfire.org Git - thirdparty/systemd.git/blob - src/basic/fdset.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
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
11 (at your option) any later version.
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
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include "sd-daemon.h"
34 #define MAKE_SET(s) ((Set*) s)
35 #define MAKE_FDSET(s) ((FDSet*) s)
37 /* Make sure we can distinguish fd 0 and NULL */
38 #define FD_TO_PTR(fd) INT_TO_PTR((fd)+1)
39 #define PTR_TO_FD(p) (PTR_TO_INT(p)-1)
41 FDSet
*fdset_new(void) {
42 return MAKE_FDSET(set_new(NULL
));
45 int fdset_new_array(FDSet
**ret
, int *fds
, unsigned n_fds
) {
56 for (i
= 0; i
< n_fds
; i
++) {
58 r
= fdset_put(s
, fds
[i
]);
60 set_free(MAKE_SET(s
));
69 FDSet
* fdset_free(FDSet
*s
) {
72 while ((p
= set_steal_first(MAKE_SET(s
)))) {
73 /* Valgrind's fd might have ended up in this set here,
74 * due to fdset_new_fill(). We'll ignore all failures
75 * here, so that the EBADFD that valgrind will return
76 * us on close() doesn't influence us */
78 /* When reloading duplicates of the private bus
79 * connection fds and suchlike are closed here, which
80 * has no effect at all, since they are only
81 * duplicates. So don't be surprised about these log
84 log_debug("Closing left-over fd %i", PTR_TO_FD(p
));
85 close_nointr(PTR_TO_FD(p
));
88 set_free(MAKE_SET(s
));
92 int fdset_put(FDSet
*s
, int fd
) {
96 return set_put(MAKE_SET(s
), FD_TO_PTR(fd
));
99 int fdset_consume(FDSet
*s
, int fd
) {
105 r
= fdset_put(s
, fd
);
112 int fdset_put_dup(FDSet
*s
, int fd
) {
118 copy
= fcntl(fd
, F_DUPFD_CLOEXEC
, 3);
122 r
= fdset_put(s
, copy
);
131 bool fdset_contains(FDSet
*s
, int fd
) {
135 return !!set_get(MAKE_SET(s
), FD_TO_PTR(fd
));
138 int fdset_remove(FDSet
*s
, int fd
) {
142 return set_remove(MAKE_SET(s
), FD_TO_PTR(fd
)) ? fd
: -ENOENT
;
145 int fdset_new_fill(FDSet
**_s
) {
146 _cleanup_closedir_
DIR *d
= NULL
;
153 /* Creates an fdset and fills in all currently open file
156 d
= opendir("/proc/self/fd");
166 while ((de
= readdir(d
))) {
169 if (hidden_file(de
->d_name
))
172 r
= safe_atoi(de
->d_name
, &fd
);
182 r
= fdset_put(s
, fd
);
192 /* We won't close the fds here! */
194 set_free(MAKE_SET(s
));
199 int fdset_cloexec(FDSet
*fds
, bool b
) {
206 SET_FOREACH(p
, MAKE_SET(fds
), i
) {
207 r
= fd_cloexec(PTR_TO_FD(p
), b
);
215 int fdset_new_listen_fds(FDSet
**_s
, bool unset
) {
221 /* Creates an fdset and fills in all passed file descriptors */
229 n
= sd_listen_fds(unset
);
230 for (fd
= SD_LISTEN_FDS_START
; fd
< SD_LISTEN_FDS_START
+ n
; fd
++) {
231 r
= fdset_put(s
, fd
);
242 set_free(MAKE_SET(s
));
247 int fdset_close_others(FDSet
*fds
) {
253 j
= 0, m
= fdset_size(fds
);
254 a
= alloca(sizeof(int) * m
);
255 SET_FOREACH(e
, MAKE_SET(fds
), i
)
256 a
[j
++] = PTR_TO_FD(e
);
260 return close_all_fds(a
, j
);
263 unsigned fdset_size(FDSet
*fds
) {
264 return set_size(MAKE_SET(fds
));
267 bool fdset_isempty(FDSet
*fds
) {
268 return set_isempty(MAKE_SET(fds
));
271 int fdset_iterate(FDSet
*s
, Iterator
*i
) {
274 if (!set_iterate(MAKE_SET(s
), i
, &p
))
280 int fdset_steal_first(FDSet
*fds
) {
283 p
= set_steal_first(MAKE_SET(fds
));