glibc

Possible Duplicate: Need help with glibc source I understand how to implement our own system calls in linux kernel. I know we can call this with syscall() or with _asm() in a c program. But I want to understand how to write glibc api for this new system call?. How the open() and read() glibc function calls mapping into system call in kernel?. char message[ ] = "Hello!\n"; int main( void ) { write( 1, message, 7 ); exit( 0 ); } When I convert the above program into assembly it is giving main: leal 4(%esp), %ecx andl $-16, %esp pushl -4(%ecx) pushl %ebp movl %esp, %ebp pushl %ecx subl $20, %esp

For the last week or so I've been investigating a problem in an application where the memory usage accumulates over time. I narrowed it down to a line that copies a std::vector< std::vector< std::vector< std::map< uint, map< uint, std::bitset< N> > > > > > in a worker thread (I realize this is a ridiculous way to organize memory). On a regular basis, the worker thread is destroyed, recreated, and that memory structure copied by the thread when it starts. The original data that gets copied is passed to the worker thread by reference from the main thread. Using malloc_stat and malloc_info, I can

I'm porting some very old (> 10y) C code to modern Linuxes. I'm getting segmentation faults within a custom-written vsnprintf() wrapper (apparently its task is to detect duplicate output strings and intern them): char* strVPrintf(const String fmt, va_list ap) { /* Guess we need no more than 50 bytes. */ int n, size = 50; char* p = (char*)memMalloc(size), q; while (1) { /* Try to print in the allocated space. */ n = vsnprintf(p, size, fmt, ap); /* If that worked, return the string. */ if (n > -1 && n < size) { break; } /* Else try again with more space. */ if (n > -1) /* glibc 2.1 */ size = n +

My question is whether Linux kernel contains libc.so.6 ? After googling and going through different links, we found that libc.so.6 , is not a part of Linux kernel, as the kernel has same libraries implemented for its own use in kernel space. libc.so.6 is a userspace library. But, still, the question was left, if the libc.so.6 is removed from "/lib", it crashes, as all the basic applications of Linux crashes. So, the basic questions were left on: Can Linux run without libc.so.6 ? If yes, where such implementation is used? Who provides libc.so.6 ? Is it provided by Linux distributions only? Does

I am trying to implement backtrace functionality for a large framework, which is used for different platforms and OS'es. In some of them, it is linked against glibc, while in the other, something different (eg. uclibc) is used. backtrace() function exists only in the former. Is there any way to tell whether glibc is used? Any #define? I was unable to find an answer in glibc manual. I know I can't have linking-time information during compilation, but I guess include files have to differ. At least backtrace have to be declared somewhere. I would like to check it without being forced to pass