add some more code

This adds a basic "worker" program.

You can now do something like

    ./server &
    ./worker &
    ./client ci_run URL REV

and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.

It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/process.h b/src/process.h
new file mode 100644
index 0000000..da0c421
--- /dev/null
+++ b/src/process.h
@@ -0,0 +1,6 @@
+#ifndef __PROCESS_H__
+#define __PROCESS_H__
+
+int proc_spawn(const char *args[], int *ec);
+
+#endif