send/receive, function (poll, timeout, send, recv, etc), and the error message
are all reported.

specifically to slurm controller.

 o Fix -Wall warnings

   slurm_protocol_socket_implementation.c
 o Added new functions slurm_send_recv*rc_msg() for handing common
   mode of sending a message and receiving only a "return code" message.
 o Overhauled existing code and performed general cleanup.

 o srun/ : place temporary fix for stdout nonblocking I/O problem

interrupts were resetting timeout in I/O functions with timeout.

   still remain.
 o cbuf.[ch], list.[ch] : Checked in new revisions from lsd-tools
 o srun/io.c,msg.c : added io_thr_create(), msg_thr_create() to simplify
   code in main().
 o Other minor fixes/changes

 o fix _STMT_START in macros.h
 o remove annoying "Interrupted system call" debug error for accept()
   with slurm_protocol_socket_implementation.c
 o fix some assert macros in xassert and xmalloc

from conman.

than 1024 file descriptors the select function call silently fails
and corrupts memory.

bad message. Functions now return SLURM_ERROR on bad unpack instead
of assert failure.

   blown away in v1.57.
 o fix bug in _slurm_set_addr_char() which caused port and family to
   be updated even though gethostbyname() failed.

(so shutdown command can shutdown both servers).

 o rewrite of slurmd.c -- extensive changes therein
 o launch msg contains port numbers instead of slurm_addrs

a slurm_addr.

that includes a buffer pointer, size, and offset. The buffer is automatically
expanded as space is needed.

_slurm_msg_sendto was not advancing the buffer pointer or decreasing the
   xmit size if the message could not be transmitted in a single send request.
_slurm_msg_recvfrom_timeout was leaving data on the socket and not reporting
   any errors if the buffer was too small for the data presented.

 o Some error and debug message cleanup.

   recv() didn't return all the bytes.

adde fcntl to slurm_protocol for non-blocking io

   of directly to a stream.

fixed launch_task_response msg
added slurm_protocol and slurmd errnos to slurm_errno.h
added print_slurm_addr to src/common/slurm_protocol_api.c
added print_slurm_credential to src/common/slurm_protocol_util.c
cleaned up debug printing and error reporting for src/slurmd/shmem_struct.c
more cleanup
etc

added a few comments and slurm_protocol_errno entries.
More little code cleanup

function now handles recv_len ==0 case and returns a error
recv is sending EOF with the 0 return code because the other side has closed the socket

moved a few more signal calls to posix standard sigaction