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Closed 7 years ago.
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1.What are the memory segments needed when executing a process?
Is it connected to virtual memory?
2. What are the open file descriptors that exist in all Unix processes?
thanks in advance
Memory Segments: Text, Data, BSS, Heap and Stack
File Descriptors: Standard Input (0), Standard Output (1) and Standard Error (2) and... they do not necessarily exists in ALL Unix processes (you can close them).
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Closed 2 years ago.
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Hard links cannot span physical devices. Exactly this statement I read while understanding the concept of hard link in Linux. Can anyone help me to understand this ?
A filename, is a pointer to an inode.
So if you're not on the same drive, it's impossible to link a file, because the inodes belongs to a specific disk
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Closed 3 years ago.
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As you can see in the picture why is the last three column is empty
It doesn't have buff/cache because that's (Block IOs) write/read cache which makes sense to have in RAM because RAM is much faster than a block device but your swap is stored on a block device, not RAM, and then you might as well read or write the data to it's actual location.
Available = free + unneeded cache and since cache doesn't exist at all in swap, available also doesn't.
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Closed 2 years ago.
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I've learned that linux directory is a file. So can I view it in binary mod like viewing other files with hexdump?
You can dump raw portions of a drive using the dd command and that is about as low level as you can get. You can also use debugfs to do maintenance on the filesystem.
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Closed 6 years ago.
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How I can find out how much /tmp space is required by an application. Generally sometime I see /tmp is full and get error saying not able to write to /tmp. So is there any way to find out how much /tmp space is required by an application ?
There is no way. Programs use /tmp on an ad-hoc basis.
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I wanted to know what exactly does happen to a packet by the time it goes to a linux kernel, until it comes out of kernel and goes as application layer.
There is a nice paper PATH OF A PACKET IN THE LINUX
KERNEL STACK(pdf), with examples and links to the kernel source code.