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Old 06-25-2013, 12:55 PM   #1
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Registered: Sep 2009
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Where is the true implementation of sendto

I am trying to explore the implementation of the "sendto" socket function. I tried to find an implementation in Linux.

In Linux, sendto function corresponds to "sys_sendto" system call. When I tried to follow it, I found a definition for it which is the following:

asmlinkage long sys_sendto (void) attribute((weak,alias("sys_ni_syscall"))

That's to say sys_sendto is nothing than an alias to sys_ni_syscall, which does nothing more than returning a value. That does not make sense, as far as I am concerned.

Besides, I found in another piece of code that "sys_sendto()" is calling "_sock_send_msg" which is in turn calling "_scok_sendmsg_nosec".

Where to find sys_snedto implementation? Is it implemented by some Assembly code? I want to find where exactly and how the information Ethernet Index is processed (passed to sendto fct in Raw socket context).
Old 07-06-2013, 06:53 PM   #2
Registered: Feb 2013
Location: Germany
Distribution: Stretch (stable)
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