isfdtype()

Determine whether a file descriptor refers to a socket

Synopsis:

#include <sys/stat.h>

int isfdtype( int filedes, 
              int fdtype );

Arguments:

fildes

The file descriptor that you want to test.

fdtype

The properties you want to test for. The valid values for fdtype include:

• S_IFSOCK — test whether filedes is a socket.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The isfdtype() function determines whether the file descriptor filedes has the properties identified by fdtype.

---

This function is based on a POSIX draft; for better portability, call fstat() and check the buffer that it fills in: if ((buf.st_mode & S_IFMT) == fdtype) /* The file descriptor matches fdtype. */ else /* The file descriptor doesn't match fdtype. */ instead of calling isfdtype().

---

Returns:

1

The filedes file descriptor matches fdtype.

0

The filedes file descriptor doesn't match fdtype.

-1

An error occurred (errno is set).

Errors:

EBADF

Invalid file descriptor filedes.

Classification:

QNX Neutrino

See also:

fstat(), isatty(), socket(), stat()