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Full Discussion: executing a program within a program
Top Forums Programming executing a program within a program Post 23707 by hirni on Thursday 27th of June 2002 03:36:25 PM
Old 06-27-2002
fork/execv in CGI
I'm having a couple of problems with my CGI program.

First, I don't know how to get [the text our getfacl program would create] back so I can return it to a web browser. I was hoping that, since getfacl program writes to standard output, that it would just be written back to the browser (or to standard output) when called from within the hello.cgi program.

Secondly, the fork command doesn't seem to work the same for a CGI program.

When I call the program from the prompt (it's called hello.cgi), everything comes out as expected...
Code:
bash-2.05$ ./hello.cgi
Content-type: text/html

waiting<br>
calling getfacl<br>called getfacl<br>done waiting<br>

but when I hit it with the web browser, what comes back is:
Code:
Content-type: text/html

calling getfacl<br>called getfacl<br>Content-type: text/html

waiting<br>
done waiting<br>

which almost seems as though it's returning the output from one process at a time... first the child process, then the parent process.

So, my two questions are:
  • How do I get the text [the program I'm calling with execv] would normally write to stdout
  • How come it's right when I execute hello.cgi from the command line, but all jumbled up when I run it through cgi

By the way, I guess I should mention that it's running through apache 1.3.20 on red had linux. Wish I knew how to get the Linux version, but...

Although I understand the concepts fairly well, I've got almost no experience with fork or the exec family (and only a little UNIX/Linux experience),

The hello.cgi code is below. Any help would be greatly appreciated.


Code:
#include <stdio.h>

int main (int argc, char *argv[])
{
  int result,stat;
  char *args[]={"getfacl", ".", 0};
  
  printf("Content-type: text/html\n\n"); 
  
  if (fork()) {
    printf("waiting<br>\n");
    result=wait(&stat);
    printf("done waiting<br>\n");
  } else {
    printf ("calling getfacl<br>");
    execv ("getfacl", args);
    printf ("called getfacl<br>");
    exit(-1);
  }
  
  printf ("\n");
  
  return 0; 
}

 

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LEARN ABOUT DEBIAN

kxterm

KXTERM(1)						      General Commands Manual							 KXTERM(1)

NAME

       kxterm - the CERN KUIP terminal emulator

SYNOPSIS

       kxterm [class] [options]

DESCRIPTION

       kxterm  is  a terminal emulator combining the best features of the (now defunct) Apollo DM pads (like: input and transcript pads, automatic
       file backup of transcript pad, string search in pads, etc.) and the Korn shell emacs-style command line editing	and  command  line  recall
       mechanism.  For more detailed information about the program, please see the online help available from the kxterm Help menu.

       kxterm  has  a  number  of  X  resources  which	can  be  set  by  the  user;  these  are  listed  in  the  online  help  and  in  the file
       /etc/X11/app-defaults/KXterm, where the default values are set.	It should be noted that when kxterm is acting  as  a  client  for  another
       application, the desired X resource should be prefixed by "Kx" plus the class name of the application.  So for application "Foo" the kxterm
       resource class would be KxFoo, and one would set KxFoo*background, etc.	One can also set the resource class of a  kxterm  window  via  the
       command-line with the class argument.

OPTIONS

       -font fn
	      Specifies  the  font used by kxterm.  The font fn must be an XLFD (X Logical Font Description), as for example displayed by the xls-
	      fonts program.

       -geometry geom
	      Specifies the preferred size and position of the kxterm window; see X(7x) for details.

       -h, -help
	      Show a summary of options.

       -iconic
	      Specifies that the window manager should start kxterm as an icon.

       -n iconname
	      Specifies the name of the kxterm window in an iconic state.

       -name name
	      Specifies both the title and the iconized name of the kxterm window.

       -pid pid
	      Specifies the process ID of the program that kxterm should act as a client for.

       -prompt prompt
	      Sets the prompt displayed in the input pad of the program.

       -tfont fn
	      Specifies the font used by text boxes, the input pad, and the transcript pad of the program.  This should probably be a  fixed-width
	      font like "courier" or "fixed".

       -title title
	      Sets the title of the kxterm window to title.

SEE ALSO

       o xlsfonts(1) - a program to list available fonts on an X server
       o paw++(1) - a program using kxterm for its command interface
       o the online help available from kxterm's Help menu

AUTHOR

       This manual page was written by Kevin McCarty <kmccarty@debian.org> for the Debian GNU/Linux system (but may be used by others).

								 January 24, 2003							 KXTERM(1)
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