I am toying around with Rust and various UNIX libraries. A use-case that I have right now is that I want to react to POSIX signals. To keep things reasonable I want to create an abstraction over the signal handling so that the rest of my program doesn’t have to worry about them as much. Let’s call the abstraction SignalHandler:
Tag: posix
what is the difference between uio.h and io.h?
Sometimes I see compiler complaining about this line with fatal error: sys/io.h: No such file or directory If I simply change it to It will magically work. Can someone explain to me the difference? Why do some OSes have one but not the other? Edit: This issue happens on a Linux, not just OS X. Answer Generally speaking, it is
What is the epoch of CLOCK_TAI?
Since Linux kernel version 3.10, the function clock_gettime() now accept CLOCK_TAI. I didn’t manage to find a detailed description of this clock. What is its epoch ? EDIT 1: Just compared the output of CLOCK_REALTIME and CLOCK_TAI on my Linux 3.19 OS and it returns the exact same value (1442582497) !? Is CLOCK_REALTIME decremented at leap seconds ? EDIT 2:
Executing an external program when forking is not advisable
I have this a big server software that can hog 4-8GB of memory. This makes fork-exec cumbersome, as the fork itself can take significant time, plus the default behavior seems to be that fork will fail unless there is enough memory for a copy of the entire resident memory. Since this is starting to show as the hottest spot (60%
how to implement POSIX threads ( pthread.h ) on fedora 9
I need to use pthreads but it seems that I do not have it in my fedora and I cannot found how to install it. Thanks Answer Fedora 9 uses Linux Kernel version 2.6 and this version is fully compatible with libc 2.3.2. This libc contains the pthread.h header. Check this implementation example. And compile with:
I read more than I write in file
I have a file, partitioned in fixed sized blocks. I am copying a test_file.txt into the 3rd block of the file. I read and copied 18 bytes. Then I am trying to copy from the file that very same .txt file I just imported to a newly created .txt, but I am writing 256 bytes to the new file. Moreover,
Physical disk block size on POSIX using C/C++
I’m working on a high performance I/O program and I’m trying to find the best way to determine the _physical_ (and not the _logical_) byte size of a device’s disk blocks with C++. My research so far has led me to the following code snippet: The man pages says the following about st_blksize: The st_blksize field gives the “preferred” blocksize
What could cause “bad file descriptor” in multithreaded environment?
This question is somehow similar to Bad file descriptor but it’s not the same at all. I know this is “bad question” (“too localized” maybe), but I can’t figure it out and I’m now out of any ideas. Introduction I have a manager thread, that starts 75 other threads. Each of these threads do a lot of things, so I’ll
Is wget or similar programs always available on POSIX systems?
Is there an HTTP client like wget/lynx/GET that is distributed by default in POSIX or *nix operating systems that could be used for maximum portability? I know most systems have wget or lynx installed, but I seem to remember installing some Ubuntu server systems using default settings and they had neither wget or lynx installed in the base package. I
How to kill all processes with a given partial name? [closed]
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