From: ian <ian>
Date: Sat, 16 Oct 1999 19:43:26 +0000 (+0000)
Subject: Sensible handling of empty reads.
X-Git-Tag: privaterel-1999-10-16-fanf
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=commitdiff_plain;h=680003740eaac3b9fb876dc1ac4d321942b451f0

Sensible handling of empty reads.
---

diff --git a/changelog b/changelog
index c86a8d9..0ef286c 100644
--- a/changelog
+++ b/changelog
@@ -8,6 +8,7 @@ adns (0.6) unstable; urgency=high
   * adnshost prints somewhat better messages about some wrong usages.
   * Include stdlib.h in adnshost.h.
   * adnslogres: parsing and error checking improved (Tony Finch).
+  * Regresion tests can cope with zero-length reads.
 
   General improvements
   * New adns_if_logpid option (functionality suggested by Tony Finch).
diff --git a/regress/case-1stservbroken.sys b/regress/case-1stservbroken.sys
index 97d861e..36c7837 100644
--- a/regress/case-1stservbroken.sys
+++ b/regress/case-1stservbroken.sys
@@ -1,40 +1,37 @@
 1stservbroken
 :12 trunc.test.iwj.relativity.greenend.org.uk
- start 940100522.187436
+ start 940102940.701451
  socket type=SOCK_DGRAM
  socket=4
- +0.000592
+ +0.000612
  fcntl fd=4 cmd=F_GETFL
  fcntl=~O_NONBLOCK&...
- +0.000614
+ +0.000605
  fcntl fd=4 cmd=F_SETFL O_NONBLOCK|...
  fcntl=OK
- +0.000566
+ +0.000573
  sendto fd=4 addr=172.18.45.2:53
      311f0100 00010000 00000000 05747275 6e630474 65737403 69776a0a 72656c61
      74697669 74790867 7265656e 656e6403 6f726702 756b0000 0c0001.
  sendto=59
- +0.006062
- select max=5 rfds=[4] wfds=[] efds=[] to=1.993938
+ +0.006374
+ select max=5 rfds=[4] wfds=[] efds=[] to=1.993626
  select=1 rfds=[4] wfds=[] efds=[]
- +0.001590
+ +0.001402
  recvfrom fd=4 buflen=512 *addrlen=16
  recvfrom=ECONNREFUSED
- +0.000661
- select max=5 rfds=[4] wfds=[] efds=[] to=1.991687
+ +0.000666
+ select max=5 rfds=[4] wfds=[] efds=[] to=1.991558
  select=0 rfds=[] wfds=[] efds=[]
- +2.-08754
- select max=5 rfds=[4] wfds=[] efds=[] to=0.000441
- select=0 rfds=[] wfds=[] efds=[]
- +0.009803
+ +2.-02914
  sendto fd=4 addr=172.18.45.6:53
      311f0100 00010000 00000000 05747275 6e630474 65737403 69776a0a 72656c61
      74697669 74790867 7265656e 656e6403 6f726702 756b0000 0c0001.
  sendto=59
- +0.002097
- select max=5 rfds=[4] wfds=[] efds=[] to=1.997903
+ +0.002262
+ select max=5 rfds=[4] wfds=[] efds=[] to=1.997738
  select=1 rfds=[4] wfds=[] efds=[]
- +0.000971
+ +0.000973
  recvfrom fd=4 buflen=512 *addrlen=16
  recvfrom=OK addr=172.18.45.6:53
      311f8380 00010008 00000000 05747275 6e630474 65737403 69776a0a 72656c61
@@ -52,72 +49,73 @@
      000c0001 0000003c 0024046c 6f6e6706 646f6d61 696e0274 6f05666f 7263650a
      7472756e 63617469 6f6e0136 c069c00c 000c0001 0000003c 0024046c 6f6e6706
      646f6d61 696e0274 6f05666f 7263650a 7472756e 63617469 6f6e0137 c069.
- +0.004198
+ +0.004340
  socket type=SOCK_STREAM
  socket=5
- +0.004875
+ +0.005126
  fcntl fd=5 cmd=F_GETFL
  fcntl=~O_NONBLOCK&...
- +0.000570
+ +0.000742
  fcntl fd=5 cmd=F_SETFL O_NONBLOCK|...
  fcntl=OK
- +0.000554
+ +0.000604
  connect fd=5 addr=172.18.45.2:53
  connect=EINPROGRESS
- +0.000793
+ +0.000797
  recvfrom fd=4 buflen=512 *addrlen=16
  recvfrom=EAGAIN
- +0.000784
- select max=6 rfds=[4] wfds=[5] efds=[] to=13.988226
+ +0.000829
+ select max=6 rfds=[4] wfds=[5] efds=[] to=13.987562
  select=1 rfds=[] wfds=[5] efds=[]
- +0.001148
+ +0.001172
  read fd=5 buflen=1
- read=OK empty
- +0.001123
+ read=OK
+     .
+ +0.001161
  write fd=5
      003b311f 01000001 00000000 00000574 72756e63 04746573 74036977 6a0a7265
      6c617469 76697479 08677265 656e656e 64036f72 6702756b 00000c00 01.
  write=61
- +0.003548
- select max=6 rfds=[4,5] wfds=[] efds=[5] to=29.982407
+ +0.003598
+ select max=6 rfds=[4,5] wfds=[] efds=[5] to=29.981631
  select=1 rfds=[5] wfds=[] efds=[]
- +0.001355
+ +0.001370
  read fd=5 buflen=2
  read=EPIPE
- +0.001444
+ +0.001699
  close fd=5
  close=OK
- +0.000660
+ +0.000687
  socket type=SOCK_STREAM
  socket=5
- +0.004654
+ +0.004866
  fcntl fd=5 cmd=F_GETFL
  fcntl=~O_NONBLOCK&...
- +0.000570
+ +0.000611
  fcntl fd=5 cmd=F_SETFL O_NONBLOCK|...
  fcntl=OK
- +0.000602
+ +0.000574
  connect fd=5 addr=172.18.45.6:53
  connect=EINPROGRESS
- +0.001046
+ +0.001082
  select max=6 rfds=[4] wfds=[5] efds=[] to=14.000000
  select=1 rfds=[] wfds=[5] efds=[]
- +0.000999
+ +0.001011
  read fd=5 buflen=1
  read=EAGAIN
- +0.000579
+ +0.000595
  write fd=5
      003b311f 01000001 00000000 00000574 72756e63 04746573 74036977 6a0a7265
      6c617469 76697479 08677265 656e656e 64036f72 6702756b 00000c00 01.
  write=61
- +0.004802
- select max=6 rfds=[4,5] wfds=[] efds=[5] to=29.965696
+ +0.005087
+ select max=6 rfds=[4,5] wfds=[] efds=[5] to=29.964049
  select=1 rfds=[5] wfds=[] efds=[]
- +0.001239
+ +0.001295
  read fd=5 buflen=2
  read=OK
      0638.
- +0.000653
+ +0.000649
  read fd=5 buflen=1592
  read=OK
      311f8580 0001001e 00010001 05747275 6e630474 65737403 69776a0a 72656c61
@@ -170,13 +168,13 @@
      69c00c00 0c000100 00003c00 25046c6f 6e670664 6f6d6169 6e02746f 05666f72
      63650a74 72756e63 6174696f 6e023239 c069c069 00020001 0000003c 0006036e
      7330c072 036e7330 c0720001 00010001 51800004 ac122d06.
- +0.008947
+ +0.009426
  read fd=5 buflen=1594
  read=EAGAIN
- +0.032609
+ +0.033394
  close fd=4
  close=OK
- +0.051246
+ +0.054384
  close fd=5
  close=OK
- +0.001019
+ +0.000977
diff --git a/regress/hcommon.c.m4 b/regress/hcommon.c.m4
index 26798cb..59d97ed 100644
--- a/regress/hcommon.c.m4
+++ b/regress/hcommon.c.m4
@@ -131,7 +131,7 @@ void Tvbbytes(const void *buf, int len) {
   const byte *bp;
   int i;
 
-  if (!len) { Tvba(" empty"); return; }
+  if (!len) { Tvba("\n     ."); return; }
   for (i=0, bp=buf; i<len; i++, bp++) {
     if (!(i&31)) Tvba("\n     ");
     else if (!(i&3)) Tvba(" ");
diff --git a/regress/hplayback.c.m4 b/regress/hplayback.c.m4
index 9088869..d7b383a 100644
--- a/regress/hplayback.c.m4
+++ b/regress/hplayback.c.m4
@@ -44,6 +44,7 @@ static void Tensurereportfile(void) {
   const char *fdstr;
   int fd;
 
+  if (Treportfile) return;
   Treportfile= stderr;
   fdstr= getenv("ADNS_TEST_REPORT_FD"); if (!fdstr) return;
   fd= atoi(fdstr);
@@ -271,7 +272,7 @@ void Q_vb(void) {
 m4_define(`hm_syscall', `
  hm_create_proto_h
 int H$1(hm_args_massage($3,void)) {
- int r;
+ int r, amtread;
  m4_define(`hm_rv_fd',`char *ep;')
  m4_define(`hm_rv_any',`char *ep;')
  m4_define(`hm_rv_len',`')
@@ -295,10 +296,10 @@ int H$1(hm_args_massage($3,void)) {
 
  Tensurereportfile();
  fprintf(Treportfile,"syscallr %s",vb2.buf);
- vb2.avail= strlen(vb2.buf);
- if (vb.avail<=0 || vb2.buf[--vb2.avail]!=hm_squote\nhm_squote)
+ amtread= strlen(vb2.buf);
+ if (amtread<=0 || vb2.buf[--amtread]!=hm_squote\nhm_squote)
   Psyntax("badly formed line");
- vb2.buf[vb2.avail]= 0;
+ vb2.buf[amtread]= 0;
  if (memcmp(vb2.buf," $1=",hm_r_offset)) Psyntax("syscall reply mismatch");
 
  if (vb2.buf[hm_r_offset] == hm_squoteEhm_squote) {
@@ -346,7 +347,8 @@ int H$1(hm_args_massage($3,void)) {
  m4_define(`hm_arg_pollfds_io',`Parg("$'`1"); Ppollfds($'`1,$'`2);')
  m4_define(`hm_arg_addr_out',`Parg("$'`1"); Paddr($'`1,$'`2);')
  $3
- if (vb2.used != vb2.avail) Psyntax("junk at end of line");
+ assert(vb2.used <= amtread);
+ if (vb2.used != amtread) Psyntax("junk at end of line");
 
  hm_create_nothing
  m4_define(`hm_arg_bytes_out',`r= Pbytes($'`2,$'`4);')