Fix per-process errstr mess.

Notes:
Mon Dec 6 12:17:28 EST 2004 rsc
    $
    what is the per-process errstr mess?
    

Tue Dec 7 01:56:03 EST 2004 glenda
    'win cmd-that-does-not-exist' outputs
    threadmain buffer error string instead of execproc one


Reference: /n/sources/patch/applied/win-errstr
Date: Mon Dec 20 18:59:35 CET 2004
Reviewed-by: rsc

--- /acme/bin/source/win/main.c	Mon Dec 20 18:59:35 2004
+++ /acme/bin/source/win/main.c	Mon Dec 20 18:59:34 2004
@@ -625,8 +625,7 @@
 		cmd = estrstrdup("/bin/", av[0]);
 		procexec(cpid, cmd, av);
 	}
-	sendul(cpid, 0UL);
-	threadexits("can't exec");
+	error("can't exec %s: %r", av[0]);
 }
 
 void
@@ -647,10 +646,6 @@
 	do
 		pid = recvul(cpid);
 	while(pid == -1);
-	if(pid == 0){
-		error("can't exec %s: %r", argv[0]);
-		threadexitsall("can't exec");
-	}
 	sprint(buf, "/proc/%d/notepg", pid);
 	*notepg = open(buf, OWRITE);
 }
--- /acme/bin/source/win/pipe.c	Mon Dec 20 18:59:35 2004
+++ /acme/bin/source/win/pipe.c	Mon Dec 20 18:59:35 2004
@@ -75,7 +75,7 @@
 					for(;;){
 						t = realloc(t, k+8192+2);
 						if(t == nil)
-							error("win: alloc failed: %r\n");
+							error("alloc failed: %r\n");
 						n = read(snarffd, t+k, 8192);
 						if(n <= 0)
 							break;