update debug log usage and add fanciness to log printing

stdlib/shell.go

@@ -68,7 +68,7 @@ var LastExitCode int
 func signalHandler() {
     for {
         <- sigChan
-        log.Log(log.DEBUG,
+        log.Log(log.INFO,
             "caught SIGINT",
             "jobctl")
 
@@ -174,7 +174,11 @@ func LaunchProcess(
     stderr io.Writer ) {
     c, cancel := context.WithCancel(context.Background())
     cmd := exec.CommandContext(c, path, args...)
-    cmd.SysProcAttr = &syscall.SysProcAttr{Foreground: !background, Setpgid: true}
+    cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+
+    if !background {
+        cmd.SysProcAttr.Foreground = true
+    }
 
     if stdin == nil {
         stdin = os.Stdin
@@ -201,6 +205,7 @@ func LaunchProcess(
     CurCancel = &cancel
 
     if background {
+        cmd.Process.Signal(syscall.SIGTSTP)
         go func(){
             waitChan <- cmd.Wait()
             delete(JobMap, cpid)
@@ -317,7 +322,7 @@ func Fg(in *ast.Token, vt ast.VarTable, ft ast.FuncTable) *ast.Token {
     }
 
     ipid := int(pid)
-    proc, ok := JobMap[ipid]
+    _, ok := JobMap[ipid]
     if !ok {
         log.Log(log.ERR,
             "Process not found, was it started by this shell?",
@@ -325,17 +330,7 @@ func Fg(in *ast.Token, vt ast.VarTable, ft ast.FuncTable) *ast.Token {
         return nil
     }
 
-    cmd := proc.Ctl
-    cmd.Process.Signal(syscall.SIGCONT)
-    err = cmd.Wait()
-    if err != nil {
-        if exitError, ok := err.(*exec.ExitError); ok {
-            LastExitCode = exitError.ExitCode()
-        } else {
-            log.Log(log.ERR, "Execution step returned error: " + err.Error(), "call")
-        }
-    }
-
+    tcsetpgrp(0, ipid)
     return nil
 }