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



NAME
       isfdtype - test file type of a file descriptor

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

       int isfdtype(int fd, intfdtype);

   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)

COLOPHON
       This  page  is  part of release 3.74 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)