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All programming languages have an explicit Boolean type.
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isfdtype(3) [linux man page]

ISFDTYPE(3)						     Linux Programmer's Manual						       ISFDTYPE(3)

isfdtype - test file type of a file descriptor SYNOPSIS
#include <sys/stat.h> #include <sys/socket.h> int isfdtype(int fd, int fdtype); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): isfdtype(): Since glibc 2.20: _DEFAULT_SOURCE Before glibc 2.20: _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
The isfdtype() function tests whether the file descriptor fd refers to a file of type fdtype. The fdtype argument specifies one of the S_IF* constants defined in <sys/stat.h> and documented in stat(2) (e.g., S_IFREG). RETURN VALUE
The isfdtype() function returns 1 if the file descriptor fd is of type fdtype and 0 if it is not. On error, -1 is returned and errno is set to indicate the cause. ERRORS
The isfdtype() function can fail with any of the same errors as fstat(3). CONFORMING TO
The isfdtype() function is not specified in any standard, but did appear in the draft POSIX.1g standard. It is present on OpenBSD and Tru64 UNIX (where the required header file in both cases is just <sys/stat.h>, as shown in the POSIX.1g draft), and possibly other systems. NOTES
Portable applications should use fstat(3) instead. SEE ALSO
fstat(3) Linux 2014-03-13 ISFDTYPE(3)

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DIRFD(3)						     Linux Programmer's Manual							  DIRFD(3)

dirfd - get directory stream file descriptor SYNOPSIS
#include <sys/types.h> #include <dirent.h> int dirfd(DIR *dirp); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): dirfd(): _BSD_SOURCE || _SVID_SOURCE DESCRIPTION
The function dirfd() returns the file descriptor associated with the directory stream dirp. This descriptor is the one used internally by the directory stream. As a result, it is only useful for functions which do not depend on or alter the file position, such as fstat(2) and fchdir(2). It will be automatically closed when closedir(3) is called. RETURN VALUE
On success, a nonnegative file descriptor is returned. On error, -1 is returned. ERRORS
POSIX.1-2008 specifies two errors, neither of which is returned by the current implementation. EINVAL dirp does not refer to a valid directory stream. ENOTSUP The implementation does not support the association of a file descriptor with a directory. CONFORMING TO
POSIX.1-2008. This function was a BSD extension, present in 4.3BSD-Reno, not in 4.2BSD. NOTES
The prototype for dirfd() is only available if _BSD_SOURCE or _SVID_SOURCE is defined. SEE ALSO
open(2), closedir(3), opendir(3), readdir(3), rewinddir(3), scandir(3), seekdir(3), telldir(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2008-08-21 DIRFD(3)

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