libglusterfs: handle failure properly in gf_system()

- Child must be terminated if execve(2) fails, otherwise it will deadlock
  parent
- Status, as of given by waitpid(2), is aggregated data, should not be
  returned as is. In fact, there is not much point in threading up the
  exitvalue: callers usually return gf_system result as is, and according
  to glusterfs conventions, they should return -1 on failure. Therefore
  now we check only for success/fail, and return 0/-1.

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1665 (glusterd hangs if spawning a child is failed)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1665

0 files changed, 0 insertions, 0 deletions