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);

   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 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)