diff --git a/lib/replace/closefrom.c b/lib/replace/closefrom.c new file mode 100644 index 00000000000..a61a80f1b0f --- /dev/null +++ b/lib/replace/closefrom.c @@ -0,0 +1,138 @@ +/* + * Unix SMB/CIFS implementation. + * Samba utility functions + * Copyright (C) Volker Lendecke 2016 + * + * ** NOTE! The following LGPL license applies to the replace + * ** library. This does NOT imply that all of Samba is released + * ** under the LGPL + * + * This library 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 3 of the License, or (at your option) any later version. + * + * This library 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ + +#include "replace.h" +#include +#include +#include + +static int closefrom_sysconf(int lower) +{ + long max_files, fd; + + max_files = sysconf(_SC_OPEN_MAX); + if (max_files == -1) { + max_files = 65536; + } + + for (fd=lower; fdd_name, &endptr, 10); + if ((fd == 0) && (errno == EINVAL)) { + continue; + } + if ((fd == ULLONG_MAX) && (errno == ERANGE)) { + continue; + } + if (*endptr != '\0') { + continue; + } + if (fd == dir_fd) { + continue; + } + if (fd > INT_MAX) { + continue; + } + if (fd < lower) { + continue; + } + + if (num_fds >= (fd_array_size / sizeof(int))) { + void *tmp; + + if (fd_array_size == 0) { + fd_array_size = 16 * sizeof(int); + } else { + if (fd_array_size + fd_array_size < + fd_array_size) { + /* overflow */ + goto fail; + } + fd_array_size = fd_array_size + fd_array_size; + } + + tmp = realloc(fds, fd_array_size); + if (tmp == NULL) { + goto fail; + } + fds = tmp; + } + + fds[num_fds++] = fd; + } + + for (i=0; i