Manpages - isfdtype.3

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 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 *fstat*(2).

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.

*fstat*(2)

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