/usr/include/dovecot/fd-set-nonblock.h is in dovecot-dev 1:2.2.9-1ubuntu2.
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 | #ifndef FD_SET_NONBLOCK_H
#define FD_SET_NONBLOCK_H
/* Set file descriptor to blocking/nonblocking state */
void fd_set_nonblock(int fd, bool nonblock);
#endif
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