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ISFDTYPE(3) Linux Programmer's Manual ISFDTYPE(3)
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 failure, -1 is returned and
errno is set to indicate the error.
The isfdtype() function can fail with any of the same errors as
fstat(2).
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(2) instead.
fstat(2)
This page is part of release 5.13 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 2021-03-22 ISFDTYPE(3)
Copyright and license for this manual page
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