01-30-2007
Quote:
Originally Posted by blowtorch
You could do a typedef and declare it as just 'samp s1'.
And about transferring the struct across sockets, there shouldn't be any problems there. Isn't it just a bunch of data? I thought you could transfer it just like you could transfer a string buffer.
Correct, the struct is just a bunch of data. Unfortunately the "char *str" element is just the memory address returned by malloc. It is not the data in that memory address.
So in the original code, what is being sent across the socket will be "meaningful" in that the receiver will understand it as a local memory address. Unfortunately, the data at that address in the receiver will not be the same as the data in that address in the originator.
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msgb(9S) Data Structures for Drivers msgb(9S)
NAME
msgb, mblk - STREAMS message block structure
SYNOPSIS
#include <sys/stream.h>
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI)
DESCRIPTION
A STREAMS message is made up of one or more message blocks, referenced by a pointer to a msgb structure. The b_next and b_prev pointers
are used to link messages together on a QUEUE. The b_cont pointer links message blocks together when a message consists of more than one
block.
Each msgb structure also includes a pointer to a datab(9S) structure, the data block (which contains pointers to the actual data of the
message), and the type of the message.
STRUCTURE MEMBERS
struct msgb *b_next; /* next message on queue */
struct msgb *b_prev; /* previous message on queue */
struct msgb *b_cont; /* next message block */
unsigned char *b_rptr; /* 1st unread data byte of buffer */
unsigned char *b_wptr; /* 1st unwritten data byte of buffer */
struct datab *b_datap; /* pointer to data block */
unsigned char b_band; /* message priority */
unsigned short b_flag; /* used by stream head */
Valid flags are as follows:
MSGMARK Last byte of message is marked.
MSGDELIM Message is delimited.
The msgb structure is defined as type mblk_t.
SEE ALSO
datab(9S)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 11 Apr 1991 msgb(9S)