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[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
     Assignee: Skipper Bug Screeners (skipper-screen-team) => Dimitri John Ledkov (xnox)

** Package changed: linux (Ubuntu) => glibc (Ubuntu)

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https://bugs.launchpad.net/bugs/1562004

Title:
  S390: glibc does not use direct socket-syscalls, but the multiplexer-
  socket-syscall.

Status in glibc package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Stefan Liebler <STLI@xxxxxxxxxx> - 2016-03-24 11:16:16 ==
  Hi,

  the glibc socket functions, like connect(), bind(), socket(), ... do currently use svc 102
  (multiplexer-socket-syscall: see /usr/include/s390x-linux-gnu/asm/unistd.h:
  #define __NR_socketcall         102)

  The direct socketsyscalls are also available for s390 since kernel 4.3:
  #define __NR_connect		362
  #define __NR_bind		361
  #define __NR_socket		359
  ...

  The kernel in my used ubuntu alpha is 4.4.0-15 and the glibc 2.23.
  This glibc release can use these direct socket-syscalls,
  if glibc is configured with "--enable-kernel=4.3.0".
  Or even better, use the kernel-level, which will be used in the first release for s390.

  
  Here is the kernel commit:
  "s390: wire up separate socketcalls system calls"
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=977108f89c989b1eeb5c8d938e1e71913391eb5f

  and the glibc commit:
  "S390: Call direct system calls for socket operations."
  https://sourceware.org/git/?p=glibc.git;a=commit;h=016495b818cb61df7d0d10e6db54074271b3e3a5

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