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NOTE: Only sfcntl is currently available.
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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:
| Error Code |
Description |
| [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
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