NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       isfdtype - test file type of a file descriptor

SYNOPSIS         top

       #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         top

       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         top

       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         top

       The isfdtype() function can fail with any of the same errors as
       fstat(3).

CONFORMING TO         top

       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         top

       Portable applications should use fstat(3) instead.

SEE ALSO         top

       fstat(3)

COLOPHON         top

       This page is part of release 4.11 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)