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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;
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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
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