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devcmd: format a 5-field status line in oscmdwait() as described by cmd(3)

--- a/kern/posix.c

+++ b/kern/posix.c

@@ -231,7 +231,9 @@

 	if(waitpid(pid, &wstatus, 0) < 0)

 		return -1;

-	return snprint(status, nstatus, "%d", wstatus);

+	if(wstatus == 0)

+		return snprint(status, nstatus, "0 0 0 0 ''");

+	return snprint(status, nstatus, "0 0 0 0 %d", (int)wstatus);

 }

 #undef kill

--- a/kern/win32.c

+++ b/kern/win32.c

@@ -421,7 +421,9 @@

 			break;

 		WaitForSingleObject((HANDLE)c, INFINITE);

 	}

-	return snprint(status, nstatus, "%d", (int)code);

+	if(code == 0)

+		return snprint(status, nstatus, "0 0 0 0 ''");

+	return snprint(status, nstatus, "0 0 0 0 %d", (int)code);

 }

 int