473,569 Members | 2,593 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

fcntl() and packing structs with unions.

I'm having some trouble building a proper argument for an ioctl call.
The operation I'm working with is TUNSETIFF _IOW('T', 202, int) which
takes a struct ifreq as the arg. Could someone familiar with the
struct (usually defined in net/if.h) tell me how the heck to encode it
using the struct/array module? An example would be fantastic.

Thanks

Sep 4 '06 #1
0 1082

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

4
1991
by: news.microsoft.com | last post by:
Hi, I am using structs and am also using property accessors to access those private member fields... TO me this is a good way of handling them, but I find alot of people using direct access to the struct memebers, since structs is just a type similar to a class (with differences I know) why should I allow direct access like that... I looked...
18
2030
by: Edward Diener | last post by:
Is the packing alignment of __nogc classes stored as part of the assembly ? I think it must as the compiler, when referencing the assembly, could not know how the original data is packed otherwise. Yet, in my understanding, attributes are only __gc and __value class specific and do not apply to __nogc classes. Is this correct ? If so, how is...
1
3170
by: Gajendra | last post by:
How does the byte packing and the byte alignment work in VC++ compiler? What is the effect of #pragma pack(n) on the alignment and byte packing for example while using the structur struc double a char b char c } in a 8 byte packing the sizeof structure is 16. Could anyone explain.
8
279
by: news.microsoft.com | last post by:
Hi, I am using structs and am also using property accessors to access those private member fields... TO me this is a good way of handling them, but I find alot of people using direct access to the struct memebers, since structs is just a type similar to a class (with differences I know) why should I allow direct access like that... I looked...
17
2799
by: Christopher Benson-Manica | last post by:
Does the following program exhibit undefined behavior? Specifically, does passing a struct by value cause undefined behavior if that struct has as a member a pointer that has been passed to free()? #include <stdlib.h> struct stype { int *foo; };
0
7614
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language...
0
8125
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7676
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
6284
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
0
5219
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
0
3653
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
0
3642
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
2114
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
0
938
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.