/usr/include/bglibs/unix.h is in libbg-dev 2.04+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #ifndef BGLIBS_UNIX__H__
#define BGLIBS_UNIX__H__
int cloexec_on(int fd);
int cloexec_off(int fd);
int fcntl_fd_on(int fd, int flag);
int fcntl_fd_off(int fd, int flag);
int fcntl_fl_on(int fd, int flag);
int fcntl_fl_off(int fd, int flag);
int nonblock_on(int fd);
int nonblock_off(int fd);
#endif
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