Questions tagged [glibc]
glibc is GNU's implementation of the Standard C library.
310
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Why and how are some shared libraries runnable, as though they are executables?
On 32-bit Linux systems, invoking this
$ /lib/libc.so.6
and on 64-bit systems this
$ /lib/x86_64-linux-gnu/libc.so.6
in a shell, provides an output like this:
GNU C Library stable release version ...
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answers
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How to update glibc to 2.14 in CentOS 6.5
I want to install Android NDK on my CentOS 6.5 machine. But when I ran the program, it says it needs glibc 2.14 to be able to run. My CentOS 6.5 only has Glibc 2.12 installed. So I tried to update ...
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What is the difference between i686 and x86_64 packages?
I have a machine with both glibc i686 and x86_64, and a very annoying problem with glibc.
Is it normal to have two libraries of the same name installed on one computer? How can I know which library ...
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votes
4
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Does bash open files in O_APPEND when using ">>" on linux?
If we use echo 1234 >> some-file then Documentation says that the output is appended.
My guess is that, if some-file does not exist, then O_CREAT will make a new file. If > was used, then ...
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3
answers
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Can new glibc versions be used with an old kernel?
Apparently glibc can be compiled with --enable-kernel to support older kernel versions. However, I haven't been able to find information on what kernel versions are supported on a particular glibc ...
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29
votes
2
answers
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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)
...
29
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3
answers
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How to deal with missing libcrypt.so.1 on Arch Linux?
How do you deal with a missing libcrypt.so.1 on Arch Linux?
Trying to run openoffice4 (the LibreOffice binary) results in:
/opt/openoffice4/program/javaldx: error while loading shared libraries: ...
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votes
5
answers
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Why is almost every program complaining about my locale?
I'm using Arch Linux, and I've followed the directions on the wiki about setting my locale.
Nearly every program that runs complains about the locale - even locale. It looks like this:
% locale
...
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26
votes
1
answer
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What would be the best way to work around this glibc problem?
I administer a Gentoo Hardened box that uses file capabilities to eliminate most of the need for setuid-root binaries (e.g. /bin/ping has CAP_NET_RAW, etc).
Infact, the only binary I have left is ...
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2
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Why doesn't the Linux kernel have optimized functions like glibc does (e.g., memchr, strchr)?
When I try to implement the C string library myself, I found that glibc and the Linux kernel have a different way to implement some functions. For instance, glibc memchr and glibc strchr use some ...
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3
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Need to install glibc >= 2.14 on Wheezy
I am trying to get Protractor working for performing e2e angular testing, but protractor requires Selenium which requires ChromeDriver which requires glibc 2.14. My current development box is running ...
- 503
21
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3
answers
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SIGINFO on GNU Linux (Arch Linux) missing
I am developing an application and I would like it to print some runtime stats to the console on demand. kill and signals came to my mind immediately.
Reading through Unix signals on Wiki, SIGINFO ...
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how to run new software without updating GLIBC?
I installed Mathematica 9 on an old Red Hat Enterprise Linux AS release 4 system.
After the installation, I tried to start Mathematica, but following message came out:
/home/wcbao/M/Wolfram/...
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17
votes
1
answer
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Using alternate libc with ld-linux.so hacks; cleaner method?
I have a legacy system with a very old glibc, which we can't upgrade without incurring a mountain of testing/validation work.
I have needed to run newer programs (such as Java 1.7) on that system ...
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1
answer
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Installing two glibc alongside in debian/ubuntu
Is it possible to install and use two different glibc versions on the same machine. Where one version is only used to run legacy software, which relies on old glibc binaries?
Is it possible to do ...
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votes
2
answers
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How to make linux 'perf record' work for libc and libstdc++ symbols?
I'm using perf record -g on x86-64 Linux to profile a program. Several symbols in libc or libstdc++ have 0 as a parent: __GI___strcmp_ssse3 (libc) and strcmp@plt (libstdc++) for example. (I can ...
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1
answer
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How to fix "skipping incompatible /usr/lib/libc.a"
I get the following error when I try to build an embedded Linux target on a 64 bit Fedora 16 (Verne):
make[3]: Entering directory `/export/home/git/minerva-5.x/third_party/multifiles'
mips-linux-gnu-...
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1
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Cross compiling GLIBC for my ARM SoC
I am seeing something really weird inside a chroot-ed Debian armel environment.
But first, a bit of backstory... This is long, but the question
is complex and any potential help depends on knowing ...
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14
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1
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Is there an easy method for installing binary builds of glibc?
Time and time again I see questions such as these:
GLIBCXX 3.4.15 on Centos 6
CentOS 4.8 and glibc 2.5
And these are the types of solutions we're typically pushing:
how to run new software without ...
slm♦
- 373k
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votes
4
answers
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uname is broken: how do I determine the currently running kernel?
> uname -r
FATAL: kernel too old
> cat /proc/cmdline
FATAL: kernel too old
There are 3 *.vmlinuz-linux files in /boot. How do I determine which kernel is currently running?
Note that I'm ...
- 3,537
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votes
1
answer
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Ghost Vulnerability - CVE-2015-0235
Does the Ghost Vulnerability require access (as in being a logged in user) to the effected OS in question? Can someone clarify the 'remote attacker that is able to make an application call'? I only ...
- 5,491
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votes
1
answer
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Unexpected sort order in en_US.UTF-8 locale
While trying to answer this question about SQL sorting, I noticed a sort order I did not expect:
$ export LC_ALL=en_US.UTF-8
$ echo "T-700A Grouped" > sort.txt
$ echo "T-700 AGrouped" >> ...
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votes
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What is in the output of "getent ahosts"?
What are the fields printed by getent ahosts DOMAIN?
The output for getent hosts is a simple combination of IP and hostname. The getent ahosts has an additional third field that is, in all my test, ...
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votes
2
answers
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No 32 development library error after install glibc-devel.i686
I am trying to install gcc 4.9.0 on centOS 6.
During ./configure there is an error coming up:
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.4.7/libgcc_s.so when searching for -...
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votes
1
answer
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How to properly upgrade glibc?
The firmware of my NAS comes with a rather old version of glibc, namely 2.5. In order to cope with some precompiled binaries linked* to glibc 2.15, I would like to upgrade it. From some simple testing ...
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2
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Rpmdb checksum is invalid - Trying to install gcc in a CentOS 7.2 docker image
So I'm trying to create a Docker image that contains gcc.
I'm running the command RUN yum -y install gcc within my Dockerfile.
It downloads the package until it finally fails trying to install a ...
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1
answer
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How does glibc within a Docker image survive different container host kernels?
Docker containers share the kernel of the host, but they do include their own applications and libraries. Is it correct that glibc is one of these libraries?
If so, how come there is no problem of ...
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votes
3
answers
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Yum says a package is installed, and not installed, and it's blocking other packages from being installed
I am trying to install a new package (glibc-static), and I get the following error
---> Package nss-softokn-freebl.i686 0:3.14.3-18.el6_6 will be installed
--> Finished Dependency Resolution
...
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9
votes
1
answer
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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
...
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9
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1
answer
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Why is the integer value of SIGRTMIN (first real-time signal) 34 and not 32? [duplicate]
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) ...
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How do I change the output of `date` back to 24-hour format?
Apparently a recent change (in Glibc 2.29?) causes the date command to start printing times in 12-hour format:
$ date
Fri 23 Aug 2019 07:34:13 PM PDT
This is for my default locale
$ cat /etc/locale....
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answers
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Would it be possible to compile and bootstrap GNU?
A new Guix release came out some time ago. And I got the idea that if I can bootstrap glibc, gcc, and guix to HURD and Mach, I can have a non-Linux GNU system. But I also need some software like bash, ...
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What is syscall-template.S?
I've come across a file syscall-template.S more specifically its location is
.../sysdeps/unix/syscall-template.S
What is this file?
Where is it. It is not on my system and I cannot find it in source ...
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votes
1
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Why doesn't unsetenv() modify /proc/pid/environ?
I was just looking at this question and wrote a noddy program to demonstrate unsetenv() modifying /proc/pid/environ. To my surprise it has no effect!
Here's what I did:
#include <stdio.h>
#...
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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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votes
1
answer
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Locally-installing glibc-2.23 causes all programs to segfault
I'm trying to upgrade glibc on a system on which I do not have root access. Therefore, I'm installing to a local prefix. I would like some help understanding best practices for setting this up, as ...
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Docker container shows, "sleep: cannot read realtime clock: Operation not permitted"
When I run apt-get dist-upgrade in Docker container, I'm getting,
Unpacking libc6:i386 (2.31-1) over (2.30-8) ...
Setting up libc6:i386 (2.31-1) ...
Checking for services that may need to be restarted....
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answer
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Upgrading Ubuntu 14.04 to glibc 2.20 or greater
I have an application written in Go that is crashing frequently and I think it's related to an issue that was fixed in glibc 2.20. My Ubuntu 14.04.3 LTS has glibc 2.19 according to ldd --version.
I'...
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ld.so.cache and libc.so.6 memory-mapped for every call?
Playing with strace, it appears to me that ld.so.cache and libc.so.6 are opened and mapped to memory for almost every process. At least those processes that I experimented with. Doesn't this mean ...
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Where is stddef.h defined in Linux?
If I want to find the values of stddef.h, where is it defined? The /usr/include/linux/stddef.h almost has nothing,
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef ...
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How to rebuild glibc on Arch Linux?
It seems like MATLAB is royally screwed up on Linux, because it "dynamically loads some libs with static TLS", which doesn't mean anything to me other than I get bunches of errors.
The suggested work ...
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Can I build a linux distro with libc instead of glibc
I recently had a conversation with a friend who is a highly skill software engineer, and he showed me some articles outlining the fact libc was much better than glibc.
I wonder if its possible to ...
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votes
1
answer
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difference between libc6-dev and libc6
libc6-dev:amd64 package in Debian contains all the common header files in C programming like stdio.h, ctype.h, time.h, etc. Am I correct that libc6:amd64, which is as far as I know required by ...
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Run a program with a newer libc
How do I run a program that was compiled against glibc 2.14 on an old system?
I'm unable to update anything. Can I download newest glibc and somehow have the program use it instead of the installed ...
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votes
1
answer
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How can I downgrade a glibc version?
I upgraded glibc for a reason that isn't around anymore so I want to downgrade it. The stupid thing is a lot of programs rely on glibc at the moment. I still have the 2.4 version on the system as the ...
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votes
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libc6 does not want to update to 2.29
I tried to install KiCad after i updated my Debian box to Debian 10, but i got the following error.
The following packages have unmet dependencies:
kicad : Depends: libc6 (>= 2.29) but 2.28-10 is to ...
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1
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Where to find the source file of function pause(void) and sigsuspend(set)
I want to find the source file of pause and sigsuspend in the glibc-2.14.1 package. I grep the package and find the file sysdeps/posix/pause.c has a definition of function pause, the code is
int
...
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Debian: How to solve ln: relocation error?
I am running Debian 7.1. I tried to apt-get install -f, and messed up. All command line returns
ln: relocation error: /lib/arm-linux-gnueabihf/libc.so.6: symbol _dl_find_dso_for_object, version ...
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votes
3
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Is the Solaris libc based on the GNU libc?
On Solaris：
basename.c
#include <stdio.h>
#include <libgen.h>
int main(int argc, char* argv[])
{
int len = strlen(argv[0]);
char *bsname = basename(argv[0]);
printf("%s\n", ...
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votes
6
answers
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Why does "yum update" fails with many duplicates, after many months of no upgrades?
After many months (> 6) of no software upgrades, I logged into an EC2 instances running:
Linux version 2.6.32-358.23.2.el6.x86_64 ([email protected]) (gcc version 4.4.7 ...
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