HP 3000 Manuals

Berkeley Sockets/iX Reference Manual

FCNTL, SFCNTL 


NOTE  Only sfcntl is currently available.


C Interface 

          #include <sys/types.h>
          #include <unistd.h>
          #include <fcntl.h>

          int sfcntl (s, cmd, arg)
          int s, cmd, arg;

Description 

The sfcntl routine provides control over open sockets.  The s parameter
is an open socket.

The following are possible values of the arg parameter.  They are also
referred to as file status flags.

O_NDELAY            Non-blocking I/O.

O_NONBLOCK          POSIX-style non-blocking I/O.

The following are possible values of the cmd argument:

F_GETFL               Get file status flags described above.

F_SETFL               Set O_NDELAY and O_NONBLOCK depending upon the
                      value of arg.  It is not possible to set both
                      O_NDELAY and O_NONBLOCK. Note:  To set a socket to
                      use blocking I/O (after previously setting it to
                      use non-blocking I/O), the arg parameter should be
                      0.

Return Value 

Upon successful completion, the value returned depends on cmd as follows:

F_GETFL               Value of file status flags and access modes.

F_SETFL               Value other than -1.

                      Otherwise, a value of -1 is returned, and errno is
                      set to indicate the error.

Errors 

The following errors are returned by sfcntl:

[EBADF]               The s parameter is not a valid open file
                      descriptor.

[EINVAL]              The cmd parameter is not a valid command.

[EINVAL]              The cmd parameter is F_SETFL, and both O_NONBLOCK
                      and O_NDELAY are specified.

MPE/iX Specific 

The sfcntl call is used instead of fcntl on MPE/iX.

Author 

The fcntl intrinsic was developed by Hewlett-Packard, AT&T, and the
University of California, Berkeley.

See Also 

close, read, write

MPE/iX 5.0 Documentation