4 * Copyright (C) 2013 Simon Ruderich
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 static void debug(const char *format, ...) {
26 /* If the file doesn't exist, do nothing. Prevents writing log files in
27 * unexpected places. The user must create the file manually. */
28 int fd = open(DEBUG_FILE, O_WRONLY | O_APPEND);
34 int written = vsnprintf(buffer, sizeof(buffer), format, ap);
37 if ((size_t)written >= sizeof(buffer)) {
38 written = sizeof(buffer) - 1;
41 /* Make sure these functions are loaded. */
42 DLSYM_FUNCTION(real_write, "write");
43 DLSYM_FUNCTION(real_close, "close");
45 static int first_call = 0;
48 real_write(fd, &nl, 1);
50 real_write(fd, buffer, (size_t)written);