_XOPEN_STREAMS

XSI Streams (_XOPEN_STREAMS) option. More...

Macros
#define	RS_HIPRI   BIT(0)
	Flag: message carries high-priority data.

Functions
int	putmsg (int fildes, const struct strbuf *ctlptr, const struct strbuf *dataptr, int flags)
	Send a STREAMS message downstream.
int	fdetach (const char *path)
	Detach a STREAMS-based file descriptor from a mount point.
int	fattach (int fildes, const char *path)
	Attach a STREAMS file descriptor to a pathname in the filesystem.
int	getmsg (int fildes, struct strbuf *ctlptr, struct strbuf *dataptr, int *flagsp)
	Receive the next message from a STREAMS file descriptor.
int	getpmsg (int fildes, struct strbuf *ctlptr, struct strbuf *dataptr, int *bandp, int *flagsp)
	Receive a priority-banded message from a STREAMS file descriptor.
int	isastream (int fildes)
	Test whether a file descriptor refers to a STREAMS file.

Detailed Description

XSI Streams (_XOPEN_STREAMS) option.

See also

XSI_STREAMS (_XOPEN_STREAMS)

Macro Definition Documentation

RS_HIPRI

#define RS_HIPRI   BIT(0)

Flag: message carries high-priority data.

Definition at line 28 of file stropts.h.

Function Documentation

fattach()

int fattach	(	int	fildes,
		const char *	path
	)

ENOSYS

Attach a STREAMS file descriptor to a pathname in the filesystem.

Parameters

fildes	STREAMS file descriptor to attach.
path	Existing pathname to attach the STREAMS fd to.

Returns

0 on success, or -1 with errno set on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/fattach.html

fdetach()

int fdetach

(

const char *

path

)

ENOSYS

Detach a STREAMS-based file descriptor from a mount point.

Parameters

path	Pathname previously used with fattach().

Returns

0 on success, or -1 with errno set on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/fdetach.html

getmsg()

int getmsg	(	int	fildes,
		struct strbuf *	ctlptr,
		struct strbuf *	dataptr,
		int *	flagsp
	)

ENOSYS

Receive the next message from a STREAMS file descriptor.

Parameters

fildes	STREAMS file descriptor.
ctlptr	Output: control part buffer, or NULL.
dataptr	Output: data part buffer, or NULL.
flagsp	Input/output: 0 or RS_HIPRI to request high-priority messages only.

Returns

0 if complete message received, 1 if more to follow, -1 on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/getmsg.html

getpmsg()

int getpmsg	(	int	fildes,
		struct strbuf *	ctlptr,
		struct strbuf *	dataptr,
		int *	bandp,
		int *	flagsp
	)

ENOSYS

Receive a priority-banded message from a STREAMS file descriptor.

Parameters

fildes	STREAMS file descriptor.
ctlptr	Output: control part buffer, or NULL.
dataptr	Output: data part buffer, or NULL.
bandp	Input/output: priority band.
flagsp	Input/output: message flags.

Returns

0 if complete message received, 1 if more to follow, -1 on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/getpmsg.html

isastream()

int isastream

(

int

fildes

)

ENOSYS

Test whether a file descriptor refers to a STREAMS file.

Parameters

fildes

File descriptor to test.

Returns

1 if fildes is a STREAMS file, 0 if not, -1 with errno set on error.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/isastream.html

putmsg()

int putmsg	(	int	fildes,
		const struct strbuf *	ctlptr,
		const struct strbuf *	dataptr,
		int	flags
	)

ENOSYS

Send a STREAMS message downstream.

Parameters

fildes	STREAMS file descriptor.
ctlptr	Control part of the message, or NULL.
dataptr	Data part of the message, or NULL.
flags	0 or RS_HIPRI.

Returns

0 on success, or -1 with errno set on failure.

See also

https://pubs.opengroup.org/onlinepubs/9699919799/functions/putmsg.html