When we debug a program using gdb, we usually see functions with strange names defined in libc(glibc?). My questions are:

  1. Is libc/glibc the standard implementation of some standard C/C++ functions like strcpy,strlen,malloc?
  2. Or, is it not only of the first usage as described above, but also an wrapper of Unix/Linux system calls like open,close,fctl? If so, why can't we issue syscalls directly, without libc?
  3. Does libc only consist of one lib (.a or .so) file, or many lib files (in this case, libc is the general name of this set of libs)? Where do these lib file(s) reside?
  4. What is the difference between libc and glibc?
c linux gnu
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