isfdtype

       #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  sys-
       tems.

NOTES
       Portable applications should use fstat(3) instead.

SEE ALSO
       fstat(3)

COLOPHON
       This  page  is  part of release 4.04 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       http://www.kernel.org/doc/man-pages/.

Linux                             2014-03-13                       ISFDTYPE(3)
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