/usr/include/bsd/unistd.h is in libbsd-dev 0.6.0-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright © 2006 Robert Millan
* Copyright © 2008-2011 Guillem Jover <guillem@hadrons.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef LIBBSD_OVERLAY
#include_next <unistd.h>
#else
#include <unistd.h>
#endif
#ifndef LIBBSD_UNISTD_H
#define LIBBSD_UNISTD_H
#include <sys/cdefs.h>
#include <sys/stat.h>
#ifndef S_ISTXT
#define S_ISTXT S_ISVTX
#endif
__BEGIN_DECLS
extern int optreset;
#ifdef LIBBSD_OVERLAY
#undef getopt
#define getopt(argc, argv, optstr) bsd_getopt(argc, argv, optstr)
#endif
int bsd_getopt(int argc, char * const argv[], const char *shortopts);
mode_t getmode(const void *set, mode_t mode);
void *setmode(const char *mode_str);
void closefrom(int lowfd);
/* Compatibility with sendmail implementations. */
#define initsetproctitle(c, a, e) setproctitle_init((c), (a), (e))
void setproctitle_init(int argc, char *argv[], char *envp[]);
void setproctitle(const char *fmt, ...);
int getpeereid(int s, uid_t *euid, gid_t *egid);
__END_DECLS
#endif
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