How to validate self-build GNU toolchain and newlib? I am working on an embedded system, where there is ARM SOC and RTOS. I have built GNU toolchain with newlib for this embedded system, and did very basic testing. Now before I can be sure to use the self-build toolchain, I want to test it (and …
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: #include <mcheck.h> #include <stdlib.h> #include <stdio.h> int main(int …
What does "6" mean in glibc.so.6? When exploring the C++ binary, I find that libstdc++.so.6 is dyn-linked into libm.so.6 and libc.so.6: $ ldd /lib/x86_64-linux-gnu/libstdc++.so.6 linux-vdso.so.1 (0x00007ffcb737b000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd3b2295000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd3b1c00000) /lib64/ld-linux-x86-64.so.2 (0x00007fd3b2396000) libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd3b2275000) My questions are: What does 6 mean in the name? I originally thought it was …
Changing the path opened by openat of a program using LD_PRELOAD I want to change a path that a program actually opens on filesystem for some paths. The reason is that I want to run a program in parallel, but that program uses /tmp/somedir/ as its temporary directory and parallel instances run into conflicts. I …
Why is MB_CUR_MAX 6 instead of 4 for UTF-8? (Linux, glibc) MB_CUR_MAX is defined by glibc as ‘a positive integer expression that is the maximum number of bytes in a multibyte character in the current locale.’ If I print the value I get 1. I assume that this is because C uses the C locale …
Version scheme change of libc6 libraires from focal to jammy Hello Ubuntu community, I notice that the Version scheme changes on libc6 libraries from focal to Jammy (i.e On the jammy libc6 packages i observe that on the libraries name minor version has been dropped out and only major is present which is not the …
Do you have to install newer Debian versions to use newer software? I am still on Debian Buster, which has old libraries in its repository. I am unable to use newer software, because for example, they require a libc.so.6 library with version GLIBC_2.30, which doesn’t exist in the buster main repository. People write that you …
Man pages, syscalls, and libc Why is epoll_create not listed as a library function (man pages, section 3), but accept is? While both functions are provided by libc and both refers to kernel syscalls? I know that "why" questions are not usually welcomed, but it’s my way to ask for a better fine-grained understanding on …
Install libc-bin 2.36 on Debian 11 I need to upgrade libc-bin from the current stable version to 2.36 on Debian 11. I have tried to do so by downloading the .deb package from http://ftp.us.debian.org/debian/pool/main/g/glibc/libc-bin_2.36-8_amd64.deb, however when I install it with dpkg –install package.deb, I am then unable to use apt install because it asks me …
Ubuntu 22.04: Both eye of gnome and gimp failing with undefined symbol error Since a few days both eog and gimp fail when launched from the command line. I get the same error message from both: gimp: symbol lookup error: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined symbol: __libc_pthread_init, version GLIBC_PRIVATE eog: symbol lookup error: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined symbol: __libc_pthread_init, version …
Why is `man 3 printf` almost one year behind `glibc ver 2.35`? glibc ver 2.35 was released 0n Feb 3, 2022, and added the %b and %B binary conversion specifiers. This is a long wished-for feature to display values as a string of "ones and zeros". I’d like to use it. I am running Ubuntu …
What happened to llseek and e2fsck? lseek man page: When users complained about data loss caused by a miscompilation of e2fsck(8), glibc 2.1.3 added the link-time warning "the llseek function may be dangerous; use `lseek64 instead." This makes this function unusable if one desires a warning-free compilation. Since glibc 2.28, this function symbol is no …
build binary on one distribution to run on other distribution I want build a quite simple command line client application on a docker container to provide that application to customers. The application uses a CAN to USB adapter from PEAK (company building this adapter). PEAK provides a library (libpcanbasic), that the application is using to …
Is it safe to snprintf with output to NULL and size 0? Is it safe to call snprintf(NULL, 0, "…", …)? I can also ask in other way: Does snprintf write the NUL char if size is 0? The example in Linux man-pages manpage printf(3) provides an example that does that, but in the rest of …
Why do I have libc.so.6 under /usr/lib/x86_64-linux-gnu directory? After I read this question difference between libc6-dev and libc6 , I started a fresh Ubuntu 20.04 LTS VPS and went checking what files are included in some Ubuntu packages. I checked libc6-dev (https://packages.ubuntu.com/focal/amd64/libc6-dev/filelist) and libc6 (https://packages.ubuntu.com/focal/amd64/libc6/filelist). As we can see, the libc6-dev have those share libraries …
How to run sublime text in Musl LibC (Void Linux) How i can run sublime text in Void Linux with musl LibC (not glibc) without using chroot or flatpak? Asked By: hasanfirdaus79 || Source Since sublime text is shareware, you’re probably not in the position to re-link it to your own libc. So, no. It …
How to uninstall glibc I was trying to install and launch a Mathematica on a server, but it couldn’t find glibc: /lib64/libc.so.6: version `GLIBC_2.14′ not found I installed a glibc-2.0 in my account, but I didn’t install it correctly. I couldn’t run almost any command after installing it. For example, when I ran ls, I …
How to upgrade libc6 (glibc) beyond v 2.31 on Ubuntu 20.04? I am using the Stockfish chess engine within some GUI, but yesterday it stopped working. I hadn’t changed the engine, nor the interface, but when I tried to run the engine it "terminated with code…", but it didn’t output any code. The only thing …
Install kernel 5.15.0 on Ubuntu 18.04 I installed the newer 5.15.0 kernel onto my Linux Mint 19.3 (Ubuntu 18.04) by https://github.com/pimlie/ubuntu-mainline-kernel.sh . All worked fine, but not for kernel headers which gave me an installation error due to the expected LIBC version that must be >= 2.34, instead of Ubuntu 18.04 that is shipped with …
Why is the integer value of SIGRTMIN (first real-time signal) 34 and not 32? Examining the output of kill -l command $ kill -l 1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM 16) …
