168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "set.h"
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#include "util.h"
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#include "macro.h"
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#include "fdset.h"
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#define MAKE_SET(s) ((Set*) s)
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#define MAKE_FDSET(s) ((FDSet*) s)
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/* Make sure we can distuingish fd 0 and NULL */
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#define FD_TO_PTR(fd) INT_TO_PTR((fd)+1)
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#define PTR_TO_FD(p) (PTR_TO_INT(p)-1)
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FDSet *fdset_new(void) {
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return MAKE_FDSET(set_new(trivial_hash_func, trivial_compare_func));
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}
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void fdset_free(FDSet *s) {
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void *p;
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while ((p = set_steal_first(MAKE_SET(s)))) {
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/* Valgrind's fd might have ended up in this set here,
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* due to fdset_new_fill(). We'll ignore all failures
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* here, so that the EBADFD that valgrind will return
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* us on close() doesn't influence us */
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/* When reloading duplicates of the private bus
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* connection fds and suchlike are closed here, which
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* has no effect at all, since they are only
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* duplicates. So don't be surprised about these log
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* messages. */
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log_debug("Closing left-over fd %i", PTR_TO_FD(p));
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close_nointr(PTR_TO_FD(p));
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}
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set_free(MAKE_SET(s));
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}
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int fdset_put(FDSet *s, int fd) {
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assert(s);
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assert(fd >= 0);
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return set_put(MAKE_SET(s), FD_TO_PTR(fd));
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}
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int fdset_put_dup(FDSet *s, int fd) {
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int copy, r;
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assert(s);
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assert(fd >= 0);
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if ((copy = fcntl(fd, F_DUPFD_CLOEXEC, 3)) < 0)
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return -errno;
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if ((r = fdset_put(s, copy)) < 0) {
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close_nointr_nofail(copy);
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return r;
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}
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return copy;
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}
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bool fdset_contains(FDSet *s, int fd) {
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assert(s);
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assert(fd >= 0);
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return !!set_get(MAKE_SET(s), FD_TO_PTR(fd));
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}
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int fdset_remove(FDSet *s, int fd) {
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assert(s);
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assert(fd >= 0);
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return set_remove(MAKE_SET(s), FD_TO_PTR(fd)) ? fd : -ENOENT;
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}
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int fdset_new_fill(FDSet **_s) {
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DIR *d;
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struct dirent *de;
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int r = 0;
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FDSet *s;
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assert(_s);
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/* Creates an fdsets and fills in all currently open file
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* descriptors. */
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if (!(d = opendir("/proc/self/fd")))
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return -errno;
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if (!(s = fdset_new())) {
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r = -ENOMEM;
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goto finish;
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}
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while ((de = readdir(d))) {
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int fd = -1;
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if (ignore_file(de->d_name))
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continue;
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if ((r = safe_atoi(de->d_name, &fd)) < 0)
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goto finish;
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if (fd < 3)
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continue;
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if (fd == dirfd(d))
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continue;
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if ((r = fdset_put(s, fd)) < 0)
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goto finish;
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}
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r = 0;
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*_s = s;
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s = NULL;
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finish:
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closedir(d);
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/* We won't close the fds here! */
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if (s)
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set_free(MAKE_SET(s));
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return r;
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}
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int fdset_cloexec(FDSet *fds, bool b) {
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Iterator i;
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void *p;
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int r;
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assert(fds);
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SET_FOREACH(p, MAKE_SET(fds), i)
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if ((r = fd_cloexec(PTR_TO_FD(p), b)) < 0)
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return r;
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return 0;
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}
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