/usr/include/lfp/fcntl.h is in libfixposix-dev 20110706.gitcf6e954-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* Permission is hereby granted, free of charge, to any person or organization */
/* obtaining a copy of the software and accompanying documentation covered by */
/* this license (the "Software") to use, reproduce, display, distribute, */
/* execute, and transmit the Software, and to prepare derivative works of the */
/* Software, and to permit third-parties to whom the Software is furnished to */
/* do so, all subject to the following: */
/* */
/* The copyright notices in the Software and this entire statement, including */
/* the above license grant, this restriction and the following disclaimer, */
/* must be included in all copies of the Software, in whole or in part, and */
/* all derivative works of the Software, unless such copies or derivative */
/* works are solely in the form of machine-executable object code generated by */
/* a source language processor. */
/* */
/* 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT */
/* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE */
/* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, */
/* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER */
/* DEALINGS IN THE SOFTWARE. */
/*******************************************************************************/
#if !defined(_LFP_FCNTL_H_)
# define _LFP_FCNTL_H_
#include <lfp/aux.h>
CPLUSPLUS_GUARD
#include <fcntl.h>
#include <inttypes.h>
#include <stdbool.h>
extern char **environ;
#if !defined(O_CLOEXEC)
// Syscalls use "int" for passing flags, and since
// *nix systems use the LP64 data model, "int" is 32 bits
// which means that we can allocate unsupported flags in the
// upper part of an uint64_t value
# define O_CLOEXEC ( 1ULL << 32 )
#endif
int lfp_open(const char *pathname, uint64_t flags, ...);
int lfp_openpt(uint64_t flags);
int lfp_creat(const char *pathname, mode_t mode);
int lfp_is_fd_cloexec(int fd);
int lfp_set_fd_cloexec(int fd, bool enabled);
int lfp_is_fd_nonblock(int fd);
int lfp_set_fd_nonblock(int fd, bool enabled);
END_CPLUSPLUS_GUARD
#endif /* _LFP_FCNTL_H_ */
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