isfdtype - test file type of a file descriptor
#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
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).
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.
The
isfdtype() function can fail with any of the same errors as
fstat(3).
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.
Portable applications should use
fstat(3) instead.
fstat(3)