2 * Copyright © 2013 Guillem Jover <guillem@hadrons.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * The automatic initialization cannot be part of the main shared library,
31 * because there is no thread-safe way to change the environ global
32 * variable. This is not a problem if the initializaion happens just at
33 * program load time, but becomes one if the shared library is directly or
34 * indirectly dlopen()ed during the execution of the program, which could
35 * have either kept references to the old environ or could change it in
36 * some other thread. This has been observed for example on systems using
39 * To avoid any other possible fallout, the constructor is split into a
40 * new static library that needs to be linked explicitly into programs
41 * using setproctitle(). As an additional safety measure the pkg-config
42 * linker flags will mark the program as not allowing to be dlopen()ed
43 * so that we make sure to avoid the problem described above.
47 * Force setproctitle_init() function into the .init_array section instead of
48 * expecting either the compiler to place constructors there or the linker to
49 * move them from .ctors to .init_array.
51 void (*libbsd_init_func)(int argc, char *argv[], char *envp[])
52 __attribute__((section(".init_array"))) = setproctitle_init;