isfdtype

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, 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  fs-
       tat(3).

CONFORMING TO
       The  isfdtype()  function is not specified in any standard, but did ap-
       pear 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 5.05 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
       https://www.kernel.org/doc/man-pages/.

Linux                             2014-03-13                       ISFDTYPE(3)