title: In which library write writev and other functions that operate on socket like send also and where is the location of .so file
body: <p>I like to run this command to look for function names similar to sendfile, send, write writev on my some system library or kernel. command</p>
  <pre><code>nm -D /usr/lib/libopenal.so.1 //or T option
  </code></pre>
  <p>But I don't know where to look for these functions exact name the idea is I just run the above command with piping with grep so I can get exact names of functions like sendfile,</p>
  <p>Someone told me then write may have name 64__sys_write which is king of correct, maybe its some other function so I like to know can I get this info on ubuntu linux</p>