f

#### l'C program executing from a tcl script with pipe opened using open command in Tcl

Hi all,

I wanted to communicate with a C program from a Tcl script.. The test
code i have written is below
Both the 'C' program and Tcl script are located in the same directory.

The 'C' program is below. I have named it  CTCL.C

#include<stdio.h>
#include<string.h>
int main()
{
int i; char c[30];
scanf("%s",c);

fflush(stdout);
return 0;
}

I have compiled the program with the command
cc CTCL.C -o ctcl
So  the executable was generated with the name 'ctcl'

The Tcl script I have written is. I have named it TCLPIPETEST.tcl

set fd [open "|./ctcl" r+]
gets $fd tmp1 puts "tmp1 =$tmp1"
set stat 0
set tmp2 "Default value...  "
if { ![catch { puts $fd "abcdef" } res]} { if { ![catch { flush$fd } res] } {
if { ![catch { gets $fd tmp2} res ] } { set stat 1 } else { puts "Error 'gets' from pipe :$res" }
} else { puts "Error 'flush' from pipe:$res " } } else { puts "Error 'puts' from pipe:$res " }

if { $stat == 1 } { puts "Success......:$tmp2 :)"
} else {
puts "Failure......:$tmp2 :(" } I have given all permissions for both the files above. When i execute the Tcl script My aim is to open a pipe with the 'C' executable 'ctcl', initially read some information from the pipe..which i have printed in the c file... write some information to the pipe so that the 'scanf in 'C' program reads that information i wrote from the tcl script. and print appropriate string back. Now i wanted to read the string read back from the Tcl pipe using gets function. and print what i have read. But what i observe is when i run the Tcl script nothing is happening.. I am not clear what is going wrong. Could anyone help me out. Thanks in Advance Ravi   0 rkanth.vvn (26) 7/11/2008 4:11:35 PM comp.lang.tcl 23428 articles. 2 followers. 1 Replies 1425 Views Similar Articles [PageSpeed] 27 Ravikanth wrote: > Hi all, > > I wanted to communicate with a C program from a Tcl script.. The test > code i have written is below > Both the 'C' program and Tcl script are located in the same directory. > > The 'C' program is below. I have named it CTCL.C > > #include<stdio.h> > #include<string.h> > int main() > { > int i; char c[30]; > printf("Reading..."); > scanf("%s",c); > printf("String read is :%s\n",c); > > fflush(stdout); > return 0; > } > > I have compiled the program with the command > cc CTCL.C -o ctcl > So the executable was generated with the name 'ctcl' > > > The Tcl script I have written is. I have named it TCLPIPETEST.tcl > > #!/usr/add-on/exptools/bin/tclsh > > set fd [open "|./ctcl" r+] > gets$fd tmp1
> puts "tmp1 = $tmp1" > set stat 0 > set tmp2 "Default value... " > if { ![catch { puts$fd "abcdef" } res]} {
>     if { ![catch { flush $fd } res] } { > if { ![catch { gets$fd tmp2} res ] } {
>                set stat 1
>           } else { puts "Error 'gets' from pipe : $res" } > } else { puts "Error 'flush' from pipe:$res " }
>  } else { puts "Error 'puts' from pipe:$res " } > > if {$stat == 1 } {
>      puts "Success......:$tmp2 :)" > } else { > puts "Failure......:$tmp2 :("
> }
>
>
> I have given all permissions for both the files above.
> When i execute the  Tcl script
> My aim is to open a pipe with the 'C' executable 'ctcl',
> initially read some information from the pipe..which i have printed in
> the c file...
> write some information to the pipe so that the 'scanf in 'C' program
> reads that information i wrote from the tcl script.
>
> and print appropriate string back.
> Now i wanted to read the string read back from the Tcl pipe using gets
> function.
>
> and print what i have read.
>
> But what i observe is when i run the Tcl script nothing is happening..
> I am not clear what is going wrong. Could anyone help me out.

Gets in Tcl reads a line (one terminated with an end of line character).
Your C program is not putting out the EOL nor is it flushing the buffer.

So what is happening is that the Tcl is waiting to read, and the C is
waiting to read (with some stuff in its output buffer).

NOTE -- this is not a Tcl unique "problem", but would have happened if both
pieces were written in any language.

--
+--------------------------------+---------------------------------------+
| Gerald W. Lester                                                       |
|"The man who fights for his ideals is the man who is alive." - Cervantes|
+------------------------------------------------------------------------+

 0
Gerald.Lester (2014)
7/11/2008 5:30:38 PM

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