From 6d50d5b97d49a74a8faf587ec2bbf234626adf0c Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Tue, 19 Oct 2021 14:16:54 -0700
Subject: Feat(rc): added subshell commands and cd builtin

Slowly chipping away at a decent feature list.
Subshell commands are executed by @{ ... }.
---
 sys/cmd/rc/wait.c | 107 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 55 insertions(+), 52 deletions(-)

(limited to 'sys/cmd/rc/wait.c')

diff --git a/sys/cmd/rc/wait.c b/sys/cmd/rc/wait.c
index e3dcea1..6a8d859 100644
--- a/sys/cmd/rc/wait.c
+++ b/sys/cmd/rc/wait.c
@@ -84,6 +84,39 @@ shouldwait(Thread *job)
     return 0;
 }
 
+static inline
+void
+notify(Thread *job, struct WaitMsg msg)
+{
+    int i;
+    for(i=0; i < job->wait.len; i++){
+        if(job->wait.on[i].pid == msg.pid){
+            job->status = msg.status;
+            switch(msg.type){
+            case Pstop:
+                print(shell.err, "%d: suspended\n", msg.pid);
+                job->wait.status = Pstop;
+                job->wait.on[i].status = Pstop;
+                break;
+
+            case Psig:
+                print(shell.err, "%d: terminated by signal %d\n", msg.pid, msg.status);
+                /* fallthrough */
+            case Pdone:
+                job->wait.on[i].status = Pdone;
+                delwait(job, msg.pid);
+                if(!job->wait.len)
+                    job->wait.status = Pdone;
+                break;
+
+            default:
+                fatal("%d: unrecognized message type %d\n", msg.pid, msg.type);
+            }
+            break;
+        }
+    }
+}
+
 // -----------------------------------------------------------------------
 // exported
 
@@ -140,34 +173,31 @@ waitall(Thread *job)
             return 0;
         }
 
-        for(i=0; i < job->wait.len; i++){
-            if(job->wait.on[i].pid == msg.pid){
-                job->status = msg.status;
-                switch(msg.type){
-                case Pstop:
-                    print(shell.err, "%d: suspended\n", msg.pid);
-                    job->wait.status = Pstop;
-                    job->wait.on[i].status = Pstop;
-                    break;
-
-                case Psig:
-                    print(shell.err, "%d: terminated by signal %d\n", msg.pid, msg.status);
-                    /* fallthrough */
-                case Pdone:
-                    job->wait.on[i].status = Pdone;
-                    delwait(job, msg.pid);
-                    if(!job->wait.len)
-                        job->wait.status = Pdone;
-                    break;
-
-                default:
-                    fatal("%d: unrecognized message type %d\n", msg.pid, msg.type);
-                }
-                break;
-            }
+        notify(job, msg);
+    }
+    return 1;
+}
+
+int
+waitfor(Thread *job, int pid)
+{
+    int i;
+    Thread *t;
+    struct WaitMsg msg;
+
+    while(shouldwait(job) && await(-job->pgid, WUNTRACED, &msg)){
+        if(msg.pid == 0){
+            perror("wait for");
+            return 0;
         }
+
+        notify(job, msg);
+        /* allow for an early exit */
+        if(msg.pid == pid)
+            return 1;
     }
     return 1;
+
 }
 
 void
@@ -197,30 +227,3 @@ killzombies(void)
         }
     }
 }
-
-#if 0
-int
-waitfor(int pid)
-{
-    Thread *t;
-    struct WaitMsg w;
-
-    if(pid >= 0 && !havewait(pid))
-        return 0;
-
-    while(await(-proc->pgid, WUNTRACED, &w)){
-        delwait(w.pid);
-        if(w.pid == pid){
-            if(w.signal)
-                print(errio, "pid[%d]: signal: %d\n", w.pid, w.status);
-            return 1;
-        }
-        for(t=proc->link; t; t=t->link){
-            if(t->pid == w.pid)
-                t->pid = -1;
-        }
-    }
-
-    return 0;
-}
-#endif
-- 
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