Questions tagged [c]
C is a general-purpose computer programming language used for operating systems, games and other high performance work and is clearly distinct from C++. It was developed in 1972 by Dennis Ritchie for use with the Unix operating system.
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Status bar in a C program
I need to incorporate a "status bar" into one of my programs. Basically, it looks like this:
+----------------------------------------+
| | ...
- 399
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0
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14
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Cannot find mqic library when compiling Mqueue-sending C program
On our linux dev server for an application at work, we have an in-house C program called sendFile to, well, send files to the Mqueue. The program has seemingly not been changed since its creation in ...
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setuid not working with C code and system() call
I have NICE-DCV installed in RHEL-8.10 and as root doing a dcv list-sessions shows all sessions on the system. But if a user does dcv list-sessions then the output from that is only their session ...
- 7,453
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Implement UDP packets filtering in C
I have a question on how to setup the filtering as described in the following scenario:
I see that systemd-resolved listens on port 53 and sends all the DNS requests to the real DNS resolvers.
I am ...
- 103
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votes
2
answers
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shell script to match a function in a file and replace it with another function in another file
I have files that contains multiple functions like below.
file1.c:
static void function1()
{
code
}
...
static void functionX()
{
code
}
...
static void lastFunction()
{
code
}
file2.c:
...
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Arch Linux version & headers package don't line up
I'm trying to write a kernel module in C on ArchLinux. Installing the linux-headers package gives me the version 6.10.5-arch1-1 but running uname -r returns 6.10.5-arch2-1
How can I install the ones ...
- 183
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vote
0
answers
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views
Waking Qemu From Suspend With USB Device
I am doing research with Linux Power Management interactions with USB devices. Which is why I would like to be able to wake a qemu vm from suspend with a passed through USB device. I have been able to ...
1
vote
1
answer
67
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Gedit Bracket match is out of range
Gedit matches brackets like { with } and tells us where the matching opening/closing bracket is. If it is more than 10000 characters, it says "Bracket match is out of range" instead. How ...
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3
votes
2
answers
108
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Is it possible for SIGALRM to be delivered after setitimer() disables the timer?
I have some code like this that has failed once on CI and once locally, though I cannot reproduce it reliably. The code is like this:
#include <stddef.h>
#include <signal.h>
#include <...
- 813
2
votes
2
answers
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Why is off_t signed?
On my journey to create a 16 EiB sized file,
I encountered the following issue:
POSIX defines files to have their size represented using type off_t,
and that "blkcnt_t and off_t shall be signed ...
- 377
8
votes
1
answer
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Does mtrace() still work in modern distros?
tldr: Does mtrace still work or am I just doing it wrong?
I was attempting to use mtrace and have been unable to get it to write data to a file. I followed the instructions in man 3 mtrace:
t_mtrace.c:...
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0
answers
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views
File descriptors get corrupted when program runs in background
I have written a program for an embedded Linux system(petalinux). It runs fine when started from the terminal or TCF debugger.
However, I want it to run when the system starts, so I use the start-stop-...
- 101
1
vote
1
answer
202
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Where do i trace NVME IO within the Linux driver?
I want to write a small Linux driver extension. More specific: I want to write all the communication between the host and a M.2-nvme-ssd into a userspace file. The nvme driver is pretty big though and ...
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0
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Does bash explicitly allow commands like passwd, su, etc., to run in setuid while disabling other custom binaries? [duplicate]
I know that /bin/bash has certain built-in protections that prevent the abuse of the Set-UID mechanism. So if I create a custom binary and execute it, it won't run with SUID 0 (refer the below image). ...
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votes
0
answers
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How to keep a shell alive after it gets started from inside a program?
I was not sure where to ask this question, since it is a mix of both programming and Linux, but hopefully this is the right place. I have written a simple program, which I'm buffer overflowing. I have ...
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