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Linux 2.6 - man page for isfdtype (linux section 3)

ISFDTYPE(3)						     Linux Programmer's Manual						       ISFDTYPE(3)

NAME
isfdtype - 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 systems.
NOTES
Portable applications should use fstat(3) instead.
SEE ALSO
fstat(3) Linux 2014-03-13 ISFDTYPE(3)

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