git: svc - Implement more features

[Matthew Dillon]

commit 82f395276fa6ba7906ecc95917af85f30a54d7a1
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Tue Nov 11 16:33:24 2014 -0800

    svc - Implement more features
    
    * All stdout/stderr output now goes to a pipe and a pipe buffering thread
      to read it into a circular buffer as well as write it to the log file.
    
      The program is now able to retain ~8KB worth of output in its circular
      buffer whether there is a log file attached to the service or not.
    
    * When /dev/null is specified as the log file, short-cut the descriptor to -1
      instead of actually writing to /dev/null.
    
    * log, logf, and tailf directives now work.
    
    * Properly escape '.' on a line by itself for all buffered data dumped
      over a remote link (allowing logs to contain our command response
      terminator).
    
    * Implement -f (foreground option) and clean-up descriptor initialization.
    
    * Implement -s (sync on exit)

Summary of changes:
 sbin/svc/execute.c | 370 +++++++++++++++++++++++++++++++++++++++++++++--------
 sbin/svc/remote.c  |   9 ++
 sbin/svc/subs.c    |   2 +-
 sbin/svc/svc.c     |   6 +
 sbin/svc/svc.h     |  13 +-
 5 files changed, 341 insertions(+), 59 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/82f395276fa6ba7906ecc95917af85f30a54d7a1


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