isfdtype(3) — Linux manual page
isfdtype(3) Library Functions Manual isfdtype(3)
NAME
isfdtype - test file type of a file descriptor
LIBRARY
Standard C library (libc, -lc)
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 failure, -1 is returned and
errno is set to indicate the error.
ERRORS
The isfdtype() function can fail with any of the same errors as
fstat(2).
VERSIONS
Portable applications should use fstat(2) instead.
STANDARDS
None.
HISTORY
It appeared 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).
SEE ALSO
fstat(2)
COLOPHON
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