I have a binary which I need to get working on an embedded system which uses uclibc, the binary was compiled against glibc, should this work? I get an error saying that the binary doesn’t exist when I try to run it, so I checked what libraries were missing. I was able to symlink all of these but one to
Tag: glibc
Putty: Network Error: Software caused connection abort
I have RHEL 6.8 Machine installed in a VM. I moved one file libc.so.6 from /lib64/ to /lib64/backup/. Since then I am not able to connect to that machine through Putty or WinSCP. Both the tools give the same error. Software caused connection abort. As I haven’t created this VM, I don’t have permis…
How we can change OS for Google App Engine flexible? Or can we do this at all?
The one I always ends with is: but I need some another version with glibc 2.14. The current’s one glibc is 2.13: And I can’t upgrade glibc on this OS, because after apt-get update and apt-get install libc6 I getting this: And I can’t modify sources.list because of: So all I need is another O…
glibc Cross Compile Configure Error
I would like to cross compile glibc. But, I ‘m getting an error. glibc version is 2.24. I tried compiling host and target i686-elf. My $MACHTYPE environment label is x86_64-pc-linux-gnu. Target directory includes binutils-2.27 and gcc-6.2.0. My PATH environment is: /home/ercan/cross/tools/tools_binaries…
Linux synchronization without polling
In principle what I want is very simple. Two executables ./read and ./write respectively read and write from a resource (let’s say a file). Using flock(2) it is easy to prevent race conditions between arbitrary invocations of ./read and ./write at arbitrary times. The requirement is that each invocation…
Understanding glibc malloc trimming
Some program that I am currently working on consumes much more memory than I think it should. So I am trying to understand how glibc malloc trimming works. I wrote the following test: Test output (without calling malloc_trim): Even though almost all memory was released, this test code consumes much more resid…
Why is sys_fork not used by glibc’s implementation of fork?
In eglibc’s nptl/sysdeps/unix/sysv/linux/i386/fork.c there’s a definition: which is used in actual __libc_fork() as the heart of the implementation. But e.g. in Linux’s arch/x86/entry/syscalls/syscall_32.tbl exists a sys_fork entry, as well as in syscalls_64.tbl. So apparently Linux does hav…
Double Free – crash or no crash
Can someone explain me why freeing a twice in a row causes a crash, but freeing a first, then b, and then a again does not crash? I know that a free will insert the heap chunk in a double linked free list. Freeing twice would insert the same chunk twice in the free list. But why is the crash
When should syscall function be used instead of glibc wrapper?
man page of syscall says, “it is useful when there is no wrapper function in c library”. If wrapper function is available, Is it always better to use wrapper function ? If not, when should prefer syscall over it? Answer Never. The only situation where you should ever consider using syscall() is to…
How to remove a broken installation of glibc
I just attempted to install glibc version 2.19 to my computer as follows: 1) I cloned the glibc git repo with 2) I checked out version 2.19 with 3) I made a directory objdir in my home directory, and built the installation there with 4) I tested the make with This gave me an error, but some webpage I found