add spawn syscall

+ Prefer over unixy fork/exec for speed since I don't want to support
  cow. Shell redirection should be done with env server and cooperating
  libc.

2 files changed, 18 insertions, 0 deletions

diff --git a/include/apos/syscalls.h b/include/apos/syscalls.h
index 5a3f2eb..a5b7e18 100644
--- a/include/apos/syscalls.h
+++ b/include/apos/syscalls.h
@@ -95,6 +95,9 @@ enum {
 	/** Execute new binary in process space. */
 	SYS_EXEC,
 
+	/** Execute new binary in new process space. */
+	SYS_SPAWN,
+
 	/** Kill thread. */
 	SYS_KILL,
 
diff --git a/include/apos/uapi.h b/include/apos/uapi.h
index cca728b..02e8816 100644
--- a/include/apos/uapi.h
+++ b/include/apos/uapi.h
@@ -535,6 +535,21 @@ SYSCALL_DECLARE0(fork);
 SYSCALL_DECLARE2(exec, bin, interp);
 
 /**
+ * Spawn binary syscall. Try to prefer over unixy fork/exec.
+ *
+ * Executes a new binary in new process space.
+ *
+ * @param bin Address of binary.
+ * @param interp Optional address of interpreter.
+ * @param c Unused.
+ * @param d Unused.
+ * @param e Unused.
+ * @return \ref OK and 0.
+ * \todo Check other return codes.
+ */
+SYSCALL_DECLARE2(spawn, bin, interp);
+
+/**
  * Kill syscall.
  *
  * @param tid Thread ID to kill. 0 if self.