ISFDTYPE(3) Linux Programmer's Manual ISFDTYPE(3)NAMEisfdtype - 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 ALSOfstat(3)COLOPHON
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Linux 2014-03-13 ISFDTYPE(3)
