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 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 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)
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