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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
     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 4.16 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)