NAME¶

isfdtype - test file type of a file descriptor

LIBRARY¶

Standard C library (libc, -lc)

SYNOPSIS¶

#include <sys/stat.h>
#include <sys/socket.h>

int isfdtype(int fd, int fdtype);

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 failure, -1 is returned and errno is set to indicate the error.

ERRORS¶

The isfdtype() function can fail with any of the same errors as fstat(2).

VERSIONS¶

Portable applications should use fstat(2) instead.

STANDARDS¶

None.

HISTORY¶

It appeared 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).

SEE ALSO¶

fstat(2)