isfdtype - test file type of a file descriptor
int isfdtype(int fd, int fdtype);
Since glibc 2.20:
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
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.
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