Questions tagged [posix]
Use this tag for code that is intended to be work on any system conforming to POSIX specifications.
125
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Copy a file portably across UNIX and UNIX-like systems with POSIX API (modeled after Boost's copy_file())
Overview:
Following the POSIX API, there are 2 versions of the function: unix_copy_file(), and unix_fcopy_file(). One works with ...
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7
votes
2
answers
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Wrappers around write() and read() and a function to copy file permissions
Below follows wrappers around read() and write() that retry when interrupted by a signal (the case where the return value is -1 ...
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vote
0
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Determining the value of PATH_MAX on UNIX-like systems
Below is the approach taken in the function allocpath() in the book "Advanced Programming in Unix Environment", which I have modified to simply determine ...
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3
votes
2
answers
104
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Get Terminal Size, Enable and Disable Terminal Raw Mode without NCURSES
I searched around and found these 7 ways to determine the width and height of the terminal:
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3
votes
1
answer
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A quine that clones itself and runs some more quines
This is a follow-up to: A Quine program in C, where today I received the following suggestion:
Now, write the code so that the binary "clones" itself (makes a replica with an altered ...
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3
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3
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Append Buffer for Buffering Small write(2) Calls
The purpose of this is written in the comment below (it is meant to be used in a text editor):
abuf.h:
...
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2
votes
1
answer
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Finding the Size of a File in a Portable Manner (revision 2)
This is a follow up to Find the Size of a File in a Portable Manner (revision).
Changes made:
The return value of fseek() and ...
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4
votes
2
answers
81
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Find the Size of a File in a Portable Manner (revision)
This is a follow up to Find the Size of a File in a Portable Manner.
What's new:
The fast version (POSIX stat()) does not change the position indicator of the ...
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4
votes
1
answer
180
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Find the Size of a File in a Portable Manner
There's no function in the Standard C Library to determine the size of a file. The POSIX Standard has stat()/fstat() which are ...
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5
votes
1
answer
194
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Parsing command-line arguments with getopt in C++
I did not find anything to parse command-line arguments in C++ (which was surprising), so I fell back to getopt() which has served me well in C (I am currently not ...
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4
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Implementing a simple byte manipulation encryption
Can you kindly take a look at the code? Any suggestions regarding performance, readability, potential bugs, portability, security measures, etc. are highly appreciated.
The code reads a character, a ...
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votes
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A simple shell in C
The M-Shell (msh) provides a basic command-line interface similar, and features some builtins (cd, exit, help, whoami, kill).
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0
votes
1
answer
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Yet another sh script to backup one directory
A single directory should simply be backed up with the zip tool, and the time of the backup should be preserved in the file name. I have written a Posix shell script for this.
Can this script simply ...
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13
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5
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Portable old-school filesystem tool
I recently made a tool called mkfh to create a FHS compliant filesystem structure.
I aimed to make it as portable as possible, so I wrote it in C89 and also tried ...
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1
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2
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Script to prevent nested root shells (POSIX)
Script to prevent nested root shells shall do exactly as said, plus some niceties like an error message when someone runs it with some argument/option.
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