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Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
 |
stropts.h(0p) |
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stropts.h − STREAMS interface (STREAMS)
#include <stropts.h>
The <stropts.h> header shall define the bandinfo structure that includes at least the following members:
unsigned
char bi_pri Priority band.
int bi_flag Flushing type.
The <stropts.h> header shall define the strpeek structure that includes at least the following members:
struct
strbuf ctlbuf The control portion of the message.
struct strbuf databuf The data portion of the message.
t_uscalar_t flags RS_HIPRI or 0.
The <stropts.h> header shall define the strbuf structure that includes at least the following members:
int
maxlen Maximum buffer length.
int len Length of data.
char *buf Pointer to buffer.
The <stropts.h> header shall define the strfdinsert structure that includes at least the following members:
struct
strbuf ctlbuf The control portion of the message.
struct strbuf databuf The data portion of the message.
t_uscalar_t flags RS_HIPRI or 0.
int fildes File descriptor of the other STREAM.
int offset Relative location of the stored value.
The <stropts.h> header shall define the strioctl structure that includes at least the following members:
int
ic_cmd ioctl() command.
int ic_timout Timeout for response.
int ic_len Length of data.
char *ic_dp Pointer to buffer.
The <stropts.h> header shall define the strrecvfd structure that includes at least the following members:
int fda
Received file descriptor.
uid_t uid UID of sender.
gid_t gid GID of sender.
The uid_t and gid_t types shall be defined through typedef as described in <sys/types.h> .
The <stropts.h> header shall define the t_scalar_t and t_uscalar_t types, respectively, as signed and unsigned opaque types of equal length of at least 32 bits.
The <stropts.h> header shall define the str_list structure that includes at least the following members:
int
sl_nmods Number of STREAMS module names.
struct str_mlist *sl_modlist STREAMS module names.
The <stropts.h> header shall define the str_mlist structure that includes at least the following member:
char l_name[FMNAMESZ+1] A STREAMS module name.
At least the following macros shall be defined for use as the request argument to ioctl():
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I_PUSH |
Push a STREAMS module. |
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I_POP |
Pop a STREAMS module. |
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I_LOOK |
Get the top module name. |
I_FLUSH
Flush a STREAM.
I_FLUSHBAND
Flush one band of a STREAM.
I_SETSIG
Ask for notification signals.
I_GETSIG
Retrieve current notification signals.
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I_FIND |
Look for a STREAMS module. |
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I_PEEK |
Peek at the top message on a STREAM. |
I_SRDOPT
Set the read mode.
I_GRDOPT
Get the read mode.
I_NREAD
Size the top message.
I_FDINSERT
Send implementation-defined information about another STREAM.
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I_STR |
Send a STREAMS ioctl(). |
I_SWROPT
Set the write mode.
I_GWROPT
Get the write mode.
I_SENDFD
Pass a file descriptor through a STREAMS pipe.
I_RECVFD
Get a file descriptor sent via I_SENDFD.
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I_LIST |
Get all the module names on a STREAM. |
I_ATMARK
Is the top message "marked’’?
I_CKBAND
See if any messages exist in a band.
I_GETBAND
Get the band of the top message on a STREAM.
I_CANPUT
Is a band writable?
I_SETCLTIME
Set close time delay.
I_GETCLTIME
Get close time delay.
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I_LINK |
Connect two STREAMs. |
I_UNLINK
Disconnect two STREAMs.
I_PLINK
Persistently connect two STREAMs.
I_PUNLINK
Dismantle a persistent STREAMS link.
At least the
following macros shall be defined for use with I_LOOK:
FMNAMESZ
The minimum size in bytes of the buffer referred to by the arg argument.
At least the following macros shall be defined for use with I_FLUSH:
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FLUSHR |
Flush read queues. |
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FLUSHW |
Flush write queues. |
FLUSHRW
Flush read and write queues.
At least the
following macros shall be defined for use with I_SETSIG:
S_RDNORM
A normal (priority band set to 0) message has arrived at the head of a STREAM head read queue.
S_RDBAND
A message with a non-zero priority band has arrived at the head of a STREAM head read queue.
S_INPUT
A message, other than a high-priority message, has arrived at the head of a STREAM head read queue.
S_HIPRI
A high-priority message is present on a STREAM head read queue.
S_OUTPUT
The write queue for normal data (priority band 0) just below the STREAM head is no longer full. This notifies the process that there is room on the queue for sending (or writing) normal data downstream.
S_WRNORM
Equivalent to S_OUTPUT.
S_WRBAND
The write queue for a non-zero priority band just below the STREAM head is no longer full.
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S_MSG |
A STREAMS signal message that contains the SIGPOLL signal reaches the front of the STREAM head read queue. |
S_ERROR
Notification of an error condition reaches the STREAM head.
S_HANGUP
Notification of a hangup reaches the STREAM head.
S_BANDURG
When used in conjunction with S_RDBAND, SIGURG is generated instead of SIGPOLL when a priority message reaches the front of the STREAM head read queue.
At least the
following macros shall be defined for use with I_PEEK:
RS_HIPRI
Only look for high-priority messages.
At least the following macros shall be defined for use with I_SRDOPT:
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RNORM |
Byte-STREAM mode, the default. |
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RMSGD |
Message-discard mode. |
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RMSGN |
Message-non-discard mode. |
RPROTNORM
Fail read() with [EBADMSG] if a message containing a control part is at the front of the STREAM head read queue.
RPROTDAT
Deliver the control part of a message as data when a process issues a read().
RPROTDIS
Discard the control part of a message, delivering any data part, when a process issues a read().
At least the
following macros shall be defined for use with I_SWOPT:
SNDZERO
Send a zero-length message downstream when a write() of 0 bytes occurs.
At least the
following macros shall be defined for use with I_ATMARK:
ANYMARK
Check if the message is marked.
LASTMARK
Check if the message is the last one marked on the queue.
At least the
following macros shall be defined for use with I_UNLINK:
MUXID_ALL
Unlink all STREAMs linked to the STREAM associated with fildes.
The following
macros shall be defined for getmsg(),
getpmsg(), putmsg(), and putpmsg():
MSG_ANY
Receive any message.
MSG_BAND
Receive message from specified band.
MSG_HIPRI
Send/receive high-priority message.
MORECTL
More control information is left in message.
MOREDATA
More data is left in message.
The <stropts.h> header may make visible all of the symbols from <unistd.h>.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
int
isastream(int);
int getmsg(int, struct strbuf *restrict, struct strbuf
*restrict,
int *restrict);
int getpmsg(int, struct strbuf *restrict, struct strbuf
*restrict,
int *restrict, int *restrict);
int ioctl(int, int, ... );
int putmsg(int, const struct strbuf *, const struct strbuf
*, int);
int putpmsg(int, const struct strbuf *, const struct strbuf
*, int,
int);
int fattach(int, const char *);
int fdetach(const char *);
The following sections are informative.
None.
None.
None.
<sys/types.h> , <unistd.h> , the System Interfaces volume of IEEE Std 1003.1-2001, close(), fcntl(), getmsg(), ioctl(), open(), pipe(), read(), poll(), putmsg(), signal(), write()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
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stropts.h(0p) | |