Telodendria/src/include/NonPosix.h
2022-08-12 21:30:03 -04:00

68 lines
2.5 KiB
C

/*
* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* NonPosix.h: A collection of functions that I know certain operating
* systems have, but they aren't specified in POSIX. I'd like to keep
* this header really small if at all possible.
*/
#ifndef TELODENDRIA_NONPOSIX_H
#define TELODENDRIA_NONPOSIX_H
/*
* Pretty much all Unix-like systems have a chroot() function. In fact,
* chroot() used to be POSIX, so any operating system claiming to be
* POSIX-like had to have a chroot(). But unfortunately chroot() is not
* in the standard anymore. Luckily, I don't know of a single operating
* system to get rid of chroot(). So we should be able to safely depend
* on a chroot() syscall being available.
*/
extern int chroot(const char *);
/*
* Telodendria is primarily developed on OpenBSD; as such, you can
* expect that it will use some OpenBSD-specific features if OpenBSD
* is the target platform.
*
* It is my goal though, to make these functions entirely optional.
* I've wrapped them in a preprocessor guard, and anywhere they're used
* should also be wrapped in the same guard. So if the target platform
* is not OpenBSD, then these aren't used at all.
*/
#ifdef __OpenBSD__
extern int pledge(const char *, const char *);
extern int unveil(const char *, const char *);
/*
* OpenBSD requires that _BSD_SOURCE be set to use SOCK_NONBLOCK for
* some reason, even though from everything I can tell, SOCK_NONBLOCK
* is POSIX.
*/
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#endif
#endif