LLA and DLPI Example Programs
DLPI Example Program
data_buf.len = length;
/* call putmsg and check for an error */ if(putmsg(fd, 0, &data_buf, 0) < 0) {
printf(”error: put_data putmsg failed, errno = %d\n”, errno); exit(1);
}
}
/********************************************************************* put a message consisting of only a control part on a stream
*********************************************************************/
void |
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put_ctrl(fd, length, pri) |
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int | fd; | /* file descriptor */ |
int | length; | /* length of control message */ |
int | pri; | /* priority of message: either 0 or RS_HIPRI */ |
{ |
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/* set the len field in the strbuf structure */ ctrl_buf.len = length;
/* call putmsg and check for an error */ if(putmsg(fd, &ctrl_buf, 0, pri) < 0) {
printf(”error: put_ctrl putmsg failed, errno = %d\n”, errno);
exit(1);
}
}
/********************************************************************* put a message consisting of both a control part and a control part on a stream
*********************************************************************/
void
put_both(fd, ctrl_length, data_length, pri)
int | fd; | /* file descriptor */ | |
int | ctrl_length; | /* length of control part */ | |
int | data_length; | /* | length of data part */ |
int | pri; | /* | priority of message: either 0 |
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| or RS_HIPRI */ |
{
/* set the len fields in the strbuf structures */ ctrl_buf.len = ctrl_length;
data_buf.len = data_length;
/* call putmsg and check for an error */ if(putmsg(fd, &ctrl_buf, &data_buf, pri) < 0) {
printf(”error: put_both putmsg failed, errno = %d\n”, errno);
exit(1);
}
}
/********************************************************************* open the DLPI cloneable device file, get a list of available PPAs, and attach to the first PPA; returns a file descriptor for the stream
*********************************************************************/
24 | Chapter 2 |
