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These questions are about Linux in general -- NOT specific to a particular distribution. If the question just happens to be in a Linux environment, please specify your Linux distribution in the body of your question, but do NOT use the /linux tag.

1
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System calls are usually atomic in the sense that they either succeed or fail. If they fail, they do a "rollback" and have no effect other than returning an error to the caller. They are also atomic i …
answered Oct 18 '18 by Johan Myréen
1
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available. (This depends on the Linux distribution.) Another problem with IPv4 link-local addresses is that they are dynamic, i.e. they are not guaranteed to stay the same over a reboot. Finally, you …
answered Nov 26 '17 by Johan Myréen
8
votes
8 MB). A process typically uses only a fraction of this stack space; small and well-behaving programs use even less. A Linux computer typically has a lot of heterogeneous processes running in …
answered May 2 '18 by Johan Myréen
4
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This is dependent on the filesystem type, but you could try to use fsck to find out how much free space there is left. Finding the free space requires a tool that understands the structure of the file …
answered Oct 3 '17 by Johan Myréen
1
vote
The NX bit was only introduced in the x86_64 architecture, it doesn't exist in the 32-bit Intel/AMD processors. Of course, practically everyone is running 64-bit PCs nowadays, but nobody seems to have …
answered Sep 29 '18 by Johan Myréen
4
votes
There are not enough soft interrupts for all system calls, so a parameter identifying the system call is needed. There is no reason to number the system calls in two dimensions. All software interrupt …
answered Jan 2 '18 by Johan Myréen
10
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The loopback interface is a virtual interface. The only purpose of the loopback interface is to return the packets sent to it, i.e. whatever you send to it is received on the interface. It makes littl …
answered May 7 '17 by Johan Myréen
1
vote
The setgid bit on files have nothing to do with directories. The setgid bit in your example means that the hoststat executable is run with a group id set to the I'd of the mail group, presumably becau …
answered May 8 '18 by Johan Myréen
0
votes
Don't configure manually, but use the /etc/network/interfaces example shown on the Debian page you linked to in your earlier question. Look for "Automating the Process". This solution uses the parprou …
answered Nov 21 '16 by Johan Myréen
0
votes
A pseudo terminal is a kernel concept that was introduced to present terminal line discipline to programs so that the programs think they are talking to a real terminal. This enables the programs to w …
answered Apr 15 '17 by Johan Myréen
4
votes
You machine is listening to port 22. Here's the line: tcp6 0 0 :::22 :::* LISTEN The socket is listening for both IPv6 and IPv4 connections.
answered Nov 6 '17 by Johan Myréen
1
vote
The extra bits are the set-user-ID bit, set-group-ID bit and sticky bit. See man 2 chmod for more information. The S for the set-user-ID bit is shown with a capital S because the corresponding x bit i …
answered Feb 13 '17 by Johan Myréen
1
vote
Kernel threads always run in kernel space. User threads are run in user space, i.e they have a user mode address space. User threads can be scheduled either with or without the support of the kernel. …
answered Sep 29 '18 by Johan Myréen
4
votes
Yes, compability is the reason. Hard disks moved to a sector size of 4096 to utilize the disk area more efficiently. All software could not be converted to use the larger sector size overnight, so 4k …
answered Jul 30 '17 by Johan Myréen
0
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Understanding the Linux Kernel 3rd ed and Linux Device Drivers 3rd ed are two choices. They are a bit old already, but there doesn't seem to be many fresh books on this topic out there. …
answered Apr 11 '17 by Johan Myréen

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