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