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Mail Archives: cygwin/2000/01/07/10:20:07

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From: "Michele Liberi" <mliberi AT hotmail DOT com>

To: cygwin AT sourceware DOT cygnus DOT com

Subject: B20.1: select bug (win 95/98 only)

Date: Fri, 07 Jan 2000 07:20:42 PST

Mime-Version: 1.0

The select function hangs while waiting for data from a pipe and the child 
process exit.

The following program well illustrates the problem.
/*************************************************************/
/* bug.c                                      M.Liberi, 1999 */
/*************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/select.h>

int main(int argc, char **argv, char **envp)
{
  int 			p1[2], p2[2], maxfd;
  fd_set		fdread;

  if (pipe(p1)) return 1;
  if (pipe(p2)) return 1;
  switch(fork())
  {
    case -1: /* error */
      return 1;
    case 0: /* child */
      close(p1[0]);
      dup2(p1[1],1);
      close(p2[0]);
      dup2(p2[1],2);
      sleep(3);
      return 0;
  }
  close(p1[1]);
  close(p2[1]);

  FD_ZERO(&fdread);
  FD_SET(p1[0],&fdread);
  FD_SET(p2[0],&fdread);
  if (p1[0]>p2[0]) 	maxfd=p1[0];
    else		maxfd=p2[0];

  printf("select input %d\n", fdread);
  select(maxfd+1,&fdread,NULL,NULL,NULL);
  printf("select output %d\n", fdread);
  return 0;
} /* main */


>>cygcheck -s -v -r output

Cygnus Win95/NT Configuration Diagnostics
Current System Time: Fri Jan 07 16:16:10 2000

Win9X Ver 4.10 build 67766446  A

Path:	/bin
	/usr/bin
	/cygnus/cygwin-b20/H-i586-cygwin32/bin
	/usr/X11r6.4/bin
	/u/mic/bin
	/dbin
	/usr/dbin
	/usr/bp/bin
	/u/mic/dbin
	/wbin
	/usr/wbin
	/u/mic/wbin
	.

SysDir: C:\WINDOWS\SYSTEM
WinDir: C:\WINDOWS

HOME = `/u/mic'
MAKE_MODE = `UNIX'
PWD = `/u/mic'

!C: = `C:\u\mic'
BLASTER = `A220 I7 D1 T2 '
CLASSPATH = `C:\PROGRA~1\PHOTOD~1.0\ADOBEC~1'
CMDLINE = `C:\BIN\BASH.EXE '
COMSPEC = `C:\WINDOWS\COMMAND.COM'
DISPLAY = `:0'
HOSTNAME = `IT024504'
HOSTTYPE = `i586'
MACHTYPE = `i586-pc-cygwin32'
OSTYPE = `cygwin32'
PROMPT = `$p$g'
SHELL = `/bin/ksh'
SHLVL = `1'
SNDSCAPE = `C:\WINDOWS'
TEMP = `C:\windows\TEMP'
TERM = `cygwin'
TMP = `c:\windows\TEMP'
TZ = `NFT-1DFT'
VIM = `c:\usr\vim5-3'
WINBOOTDIR = `C:\WINDOWS'
WINDIR = `C:\WINDOWS'
_ = `/cygnus/cygwin-b20/H-i586-cygwin32/bin/cygcheck'

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start 
Menu\&Programs\Cygnus Solutions
  (default) = (unsupported type)
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
HKEY_CURRENT_USER\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts\00
  (default) = `C:'
  unix = `/'
  fbinary = 0x00000000
  fsilent = 0x00000000
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Cygnus 
Cygwin B20
  (default) = `C:\WINDOWS\IsUninst.exe -fc:\cygnus\cygwin-b20\Uninst.isu'
  DisplayName = `Cygwin B20'
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin B20
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\Cygwin B20\B20.1
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\GNUPro
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\GNUPro\i586-cygwin32
HKEY_LOCAL_MACHINE\Software\Cygnus 
Solutions\GNUPro\i586-cygwin32\i586-cygwin32
HKEY_LOCAL_MACHINE\Software\Cygnus 
Solutions\GNUPro\i586-cygwin32\i586-cygwin32\cygwin-B20.1
  (default) = `c:\cygnus\cygwin-b20'
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL setup
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL setup\b15.0\mounts
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\00
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\01
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\02
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\03
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\04
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\05
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\06
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\07
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\08
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\09
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0A
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0B
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0C
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0D
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0E
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\0F
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\10
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\11
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\12
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\13
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\14
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\15
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\16
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\17
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\18
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\19
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\1A
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\1B
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\1C
HKEY_LOCAL_MACHINE\Software\Cygnus Solutions\CYGWIN.DLL 
setup\b15.0\mounts\1D

a:\ fd           N/A    N/A
c:\ hd  FAT32   7995Mb  64% CP    UN
d:\ cd           N/A    N/A
e:\ cd           N/A    N/A

C:    /        native  text!=binary

Found: C:\bin\bash.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\bash.exe
Warning: C:\bin\bash.exe hides 
C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\bash.exe
Found: \bin\bash.exe
Warning: C:\bin\bash.exe hides \bin\bash.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cat.exe
Found: C:\u\mic\bin\cat.exe
Warning: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cat.exe hides 
C:\u\mic\bin\cat.exe
Not Found: cpp (good!)
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\find.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\gcc.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\gdb.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\ld.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\ls.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\make.exe
Found: C:\usr\bp\bin\make.exe
Warning: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\make.exe hides 
C:\usr\bp\bin\make.exe
Found: C:\bin\sh.exe
Found: C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\sh.exe
Warning: C:\bin\sh.exe hides C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\sh.exe
Found: \bin\sh.exe
Warning: C:\bin\sh.exe hides \bin\sh.exe

  371k 1998/12/01 C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cygtcl80.dll - 
os=4.0 img=1.0 sys=4.0
                  "cygtcl80.dll" v0.0 ts=1998/12/1 9:25
    5k 1998/12/01 C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cygtclpip80.dll - 
os=4.0 img=1.0 sys=4.0
   10k 1998/12/01 C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cygtclreg80.dll - 
os=4.0 img=1.0 sys=4.0
                  "cygtclreg80.dll" v0.0 ts=1998/12/1 9:25
  600k 1998/12/01 C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cygtk80.dll - 
os=4.0 img=1.0 sys=4.0
                  "cygtk80.dll" v0.0 ts=1998/12/1 9:28
  446k 1998/12/03 C:\cygnus\cygwin-b20\H-i586-cygwin32\bin\cygwin1.dll - 
os=4.0 img=1.0 sys=4.0
                  "cygwin1.dll" v0.0 ts=1998/12/4 5:39
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Message-ID:	<20000107152043.75819.qmail@hotmail.com>
X-Originating-IP:	[195.212.29.113]
From:	"Michele Liberi" <mliberi AT hotmail DOT com>
To:	cygwin AT sourceware DOT cygnus DOT com
Subject:	B20.1: select bug (win 95/98 only)
Date:	Fri, 07 Jan 2000 07:20:42 PST
Mime-Version:	1.0