I try to compile program which use request_irq function declarated in linux/sched.h but it bring a lot of errors relating to include directives in sched.h.
I try on Mandrake7.2 and RedHat7.2 but result same.
A lot of thanks for your answers. (2 Replies)
Hi
I am using setjmp and longjmp in a deeply nested functions BUT longjmp is not returning(hanging in longjmp)
How can I debug this issue. I could not cut and paste the code due to its size and it is chained with other programs.
Is there any way to trace where the... (2 Replies)
Is there a command where I can pipe my grep into it and it will output it with spaces rather than returns?
Example
I want to turn
prompt$ grep blah file
blah
blah
into this
prompt$ grep blah file | someCommand
blah blah (1 Reply)
I have a process that need two active connections to the same zone of shared memory. But when i do the second call to shmat it give me error 22 (EINVAL). Only works ok the second call to shmat if i disconnect the first connection (shmdt)
In Sun,AIX and Digital, i donīt have this problem.
... (7 Replies)
I have a process that needs two active connections to the same zone of shared memory simultaneously.
The firs conection works ok, but when i do the second call to shmat it give me error 22 (EINVAL). Only works ok the second call to shmat if i disconnect the first connection (shmdt)
Steps:... (3 Replies)
Hi all,
I am trying to grep a .txt file for a word. When I hit enter, it returns back to $
The file is 4155402 in size and is named in this way:
*_eveningtimes_done_log.txt
I use this command, being in the same directory as the file:
grep -i "invalid" *_eveningtimes_done_log.txt
... (16 Replies)
mon_yy=${1}
date_found=`find_end_day $mon_yy`
export_dealer_changes ${date_found}
Hello
I am trying to pull a formatted date back from the function find_end_day and pass it into the function export_dealer_changes. When I try the above the variable date_found is empty. I have tried various... (3 Replies)
Hi,
I need to return a value from the function. the value will be the output from cat command which uses random fucntion.
#!/bin/ksh
hello()
{
var1=$(`cat /dev/urandom| tr -dc 'a-zA-Z0-9-!%&()*+,-/:;<=>?_'|fold -w 10 | head -n 1`)
echo "value is" var1
return var1
}
hello
var=$?... (2 Replies)
I'm having a little trouble returning a value from a function or calling it, I'm not quite sure.
I'm calling the function here
function region_lookup_with_details {
results = $(set_region)
echo $results
}
This is the function I'm calling
function set_region {
... (8 Replies)
Discussion started by: akechnie
8 Replies
LEARN ABOUT OSX
copyb
copyb(9F) Kernel Functions for Drivers copyb(9F)NAME
copyb - copy a message block
SYNOPSIS
#include <sys/stream.h>
mblk_t *copyb(mblk_t *bp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
bp Pointer to the message block from which data is copied.
DESCRIPTION
copyb() allocates a new message block, and copies into it the data from the block that bp denotes. The new block will be at least as large
as the block being copied. copyb() uses the b_rptr and b_wptr members of bp to determine how many bytes to copy.
RETURN VALUES
If successful, copyb() returns a pointer to the newly allocated message block containing the copied data. Otherwise, it returns a NULL
pointer.
CONTEXT
copyb() can be called from user or interrupt context.
EXAMPLES
Example 1: : Using copyb
For each message in the list, test to see if the downstream queue is full with the canputnext(9F) function (line 21). If it is not full,
use copyb to copy a header message block, and dupmsg(9F) to duplicate the data to be retransmitted. If either operation fails, reschedule a
timeout at the next valid interval.
Update the new header block with the correct destination address (line 34), link the message to it (line 35), and send it downstream (line
36). At the end of the list, reschedule this routine.
1 struct retrans {
2 mblk_t *r_mp;
3 int r_address;
4 queue_t *r_outq;
5 struct retrans *r_next;
6 };
7
8 struct protoheader {
...
9 int h_address;
...
10 };
11
12 mblk_t *header;
13
14 void
15 retransmit(struct retrans *ret)
16 {
17 mblk_t *bp, *mp;
18 struct protoheader *php;
19
20 while (ret) {
21 if (!canputnext(ret->r_outq)) { /* no room */
22 ret = ret->r_next;
23 continue;
24 }
25 bp = copyb(header); /* copy header msg. block */
26 if (bp == NULL)
27 break;
28 mp = dupmsg(ret->r_mp); /* duplicate data */
29 if (mp == NULL) { /* if unsuccessful */
30 freeb(bp); /* free the block */
31 break;
32 }
33 php = (struct protoheader *)bp->b_rptr;
34 php->h_address = ret->r_address; /* new header */
35 bp->bp_cont = mp; /* link the message */
36 putnext(ret->r_outq, bp); /* send downstream */
37 ret = ret->r_next;
38 }
39 /* reschedule */
40 (void) timeout(retransmit, (caddr_t)ret, RETRANS_TIME);
41 }
SEE ALSO allocb(9F), canputnext(9F), dupmsg(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 07 Nov 1996 copyb(9F)
11-08-2010
