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I am writing a character device driver in C for Linux and have run into a problem where my module_write function is being called repeatedly. What could be causing this?
Attached is a screenshot of the command used to write to the device file and the kernel log output
As you can see, it looks as though the module_write function is being called repeatedly. It doesn't matter how I write to the file (I tried using vim, echo and tee)
Source: https://gist.github.com/SamTebbs33/8ed6a1d165fae1ca27fff5b495d04797
You keep saying that 0 bytes were successfully written, so the program keeps trying to write its three bytes.
You should instead be returning the number of bytes you processed successfully from the buffer.
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I'm new to flex and bison and i couldn't figure it out. I want to read a file. This is okey for now. But while bison/flex parse and read file, I want to make it wait for new input and get it from command line. Is there a keyword or way to do it?
I tried abort yyparse() with yyerror() and get input by scanf(). But it didn't work. It doesn't wait for input and goes on.
I did a project school named mini_shell and what we asked to do was to code something like bash.
the main thing was to wait for user input and execute the command he entered, you can do that by a function named.
char *readline(const char *prompt); (you can read the man page to understand more https://man7.org/linux/man-pages/man3/readline.3.html) but I think you need to install it first before you can use it, you can find a lot of tutorials explaining how to do that based on your OS.
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I am a beginner in C, I wrote a code to calculate the average of grades, it's fairly simple, but it won't close properly when I run it in the .exe. I'll attach a video showing how it works, first I run it from the code, then from the .exe.
Video
Whatever the IDE is you're using, it is using a runner.exe to wrap the execution of your program and show you that "program stopped, hit any key" sort of prompt.
That doesn't happen for a compiled program, and the console window is closed right away at your exit(-1) call.
If you want to see the final output of your program, run it via the command prompt.
You can use exit(0) instead of exit(-1).
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I know it is not recommended to post code as an image, since I am getting a formatting error when trying to post code on here. Anyway, I am trying to write a simple C program to count number of words, characters, newlines using do while loop. However, the output is not as expected. Please help!
Instead of a do-while, you should try using while. Since your code starts off by checking whether a is any of your if cases, it goes to the else case, and increments the New line variable. If possible, could you share the output screen.
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So lets say I have received a message that resembles the following
"L2N5*8R10!11T0A1K3Y14#4W7O6O9C12R13"
and I am expected to sort out the characters in accordance to the numbers succeeding them and change the characters that are not letters into a space. I have no problem doing the sorting out part, I am only having a trouble while trying to write a function that will change those characters into space.
The out put should be something like this
TALK NOW OR CRY
but I am getting
TALK#NOW*OR!CRY
Can anyone help me figure out what my function should look like so that I can be able to change the characters into space??
Unless you show your code, we'll only be able to guess!!
However, as a general suggestion, I would recommended, you should check each entry against isalpha(). In case you got a return value of 0, replace the entry with a .
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I have managed to "translate" an entire code written in C to LUA, the source code permits to drive an 5110/3110 LCD and I have tried not to modify the code, but the port names, because I will run it on a router and use the LED as GPIO pins.
Anyway... I've been translating about 3 hours and now I'm done, but it wont run, it shows me errors, wherer I can't find one... For me it seems good.
C Source: http://www.est.ipcb.pt/pessoais/alexandre_t/fon_LCD/3310_ex_1.c
My translated LUA Script: https://gist.github.com/anonymous/62cc0897ede3cb788baa
The first error it gives me ìs that Screen.lua:26: '(' expected near 'local'
But there don't seem to be an error...
If anyone could revise my code and point me forward, I would be very glad.
The error seems pretty obvious based on the error message. Missing ( exactly as the error message says at exactly the line it says.
function posicao
local x1=0
...
end
Should be
function posicao()
local x1=0
...
end