[shepherd] branch master updated (ada8807 -> 4c031cf)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository shepherd.

    from ada8807  service: 'shutdown-services' no longer introduces a 
continuation barrier.
     new d97592f  service: 'make-kill-destructor' waits for termination, 
eventually SIGKILLs.
     new 9b34a1f  service: 'eval' action gracefully handles user code returning 
zero values.
     new f1f5929  support: Make the 'load' and 'eval' actions suspendable.
     new 279f0db  shepherd: Restore 'system*' in the child process after fork.
     new 4c031cf  Update 'NEWS'.

The 5 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.


Summary of changes:
 NEWS                         |  40 ++++++++++++++++
 doc/shepherd.texi            |  26 ++++++----
 modules/shepherd.scm         |  32 +++++++++----
 modules/shepherd/service.scm | 110 +++++++++++++++++++++++++++++++++++--------
 modules/shepherd/support.scm |  19 +++++++-
 tests/basic.sh               |   5 ++
 tests/forking-service.sh     |  32 +++++++++++--
 7 files changed, 218 insertions(+), 46 deletions(-)