If I change 373 in "print $parent "exit now\r\n\r" x 373;" to 745 (744 hangs) it works.

C:\Documents and Settings\Owner\Desktop>perl -e "print (length(\"exit 
+now\r\n\r\
" x 745).\"\n\");"
8195
[download]

I guess is somewhat explained by the hung C callstack of the child of my first script.

     ntdll.dll!_KiFastSystemCallRet@0()     
     ntdll.dll!_NtReadFile@36()  + 0xc    
     kernel32.dll!_ReadFile@20()  + 0x67    
>    msvcr71.dll!_read_lk(int fh=3, void * buf=0x00963fec, unsigned in
+t cnt=8192)  Line 154 + 0x15    C
     msvcr71.dll!_read(int fh=3, void * buf=0x00963fec, unsigned int c
+nt=8192)  Line 75 + 0xc    C
     perl517.dll!win32_read(int fd=3, void * buf=0x00963fec, unsigned 
+int cnt=8192)  Line 3209 + 0x12    C
     perl517.dll!PerlLIORead(IPerlLIO * piPerl=0x00346654, int handle=
+3, void * buffer=0x00963fec, unsigned int count=8192)  Line 1033 + 0x
+11    C++
     perl517.dll!PerlIOUnix_read(interpreter * my_perl=0x0093502c, _Pe
+rlIO * * f=0x00935e8c, void * vbuf=0x00963fec, unsigned int count=819
+2)  Line 2789 + 0x22    C
     perl517.dll!Perl_PerlIO_read(interpreter * my_perl=0x0093502c, _P
+erlIO * * f=0x00935e8c, void * vbuf=0x00963fec, unsigned int count=81
+92)  Line 1679 + 0x3e    C
     perl517.dll!PerlIOBuf_fill(interpreter * my_perl=0x0093502c, _Per
+lIO * * f=0x00935aa4)  Line 4033 + 0x1b    C
     perl517.dll!Perl_PerlIO_fill(interpreter * my_perl=0x0093502c, _P
+erlIO * * f=0x00935aa4)  Line 1776 + 0x36    C
     perl517.dll!PerlIOBase_read(interpreter * my_perl=0x0093502c, _Pe
+rlIO * * f=0x00935aa4, void * vbuf=0x0095b49c, unsigned int count=1) 
+ Line 2170 + 0xd    C
     perl517.dll!PerlIOBuf_read(interpreter * my_perl=0x0093502c, _Per
+lIO * * f=0x00935aa4, void * vbuf=0x0095b49c, unsigned int count=1)  
+Line 4054 + 0x15    C
     perl517.dll!Perl_PerlIO_read(interpreter * my_perl=0x0093502c, _P
+erlIO * * f=0x00935aa4, void * vbuf=0x0095b49c, unsigned int count=1)
+  Line 1679 + 0x3e    C
     perl517.dll!Perl_pp_sysread(interpreter * my_perl=0x0093502c)  Li
+ne 1775 + 0x18    C
     perl517.dll!Perl_runops_debug(interpreter * my_perl=0x0093502c)  
+Line 2126 + 0xd    C
     perl517.dll!win32_start_child(void * arg=0x0093502c)  Line 1742 +
+ 0xd    C++
     kernel32.dll!_BaseThreadStart@8()  + 0x37
[download]

0x2000/8192 was passed as the read amount to ReadFile. Does anyone know what should have happened on Windows? What happens on Unix? 8192 read also? or it will still succeed for POSIX reasons? is the 8192 read length a bug or correct?

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