htbt and protocol overhaul ...

* htbt overhaul
  * Abandon async slv io. slv io is now synchronous
  * htbt_do_cmd()
    * w/ detach flag: set up closed pipes for stdio
    * Create new pg for child and kill the pg on error
    * Do waitpid() w/ timeout
    * Wait for child spawn w/ timeout
    * Always reap child
  * Add fork cb for clean up code(to unmask signals, deinit libs)
* Protocol overhaul
  * Use stdio frames to transfer binary data for
    PRNE_HTBT_OP_UP_BIN and PRNE_HTBT_OP_RUN_BIN op
  * bin_meta bin_size -> alloc_len. This is an optional field now
* Fix protocol
  * detach flag of cmd_head not being (de)serialised
  * cmd_head (d)ser funcs not setting actual correctly
* Proone: call setsid() on daemonisation
* Fix compilation error caused by missing <errno.h>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/htbt.h b/src/htbt.h
index d528c89..9bf2ff2 100644
--- a/src/htbt.h
+++ b/src/htbt.h
@@ -23,6 +23,7 @@ typedef bool(*prne_htbt_bin_ft)(
 	void *ctx,
 	const char *path,
 	const prne_htbt_cmd_t *cmd);
+typedef bool(*prne_htbt_fork_ft)(void *ctx);
 
 struct prne_htbt_cbset {
 	// All callback functions are optional.
@@ -30,6 +31,7 @@ struct prne_htbt_cbset {
 	prne_htbt_hostinfo_ft hostinfo;
 	prne_htbt_tmpfile_ft tmpfile;
 	prne_htbt_bin_ft upbin;
+	prne_htbt_fork_ft fork;
 };
 
 struct prne_htbt_param {