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 fs-
tat(2).
STANDARDS
The isfdtype() function is not specified in any standard, but did ap-
pear 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(2) instead.
SEE ALSO
fstat(2)
Linux man-pages 6.03 2022-10-30 isfdtype(3)
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