>Number: 4746
>Category: mod_cgi
>Synopsis: duplicate output and header while forking
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: apache
>State: open
>Class: sw-bug
>Submitter-Id: apache
>Arrival-Date: Wed Jul 21 07:10:02 PDT 1999
>Last-Modified:
>Originator: [EMAIL PROTECTED]
>Organization:
apache
>Release: 1.3.6
>Environment:
sco openserver 5.04 on a dell poweredge 4300
>Description:
when forking with apache 1.3.6, i experience some harsh problem with http
header and content :
if i write something to standard output before the C fork instruction, and,
despite the fact i close stdout in my first child instruction line, i got a
duplicate of header and bodies (I.e if i output onhting but the header
text/plain, i'll get a plain text file (that's ok) but it will not be void. It
will contain "Content-type: text/plain"....
and it is worse when i've done some previous output with an html page.
////////////////
SAMPLE DUPLICATE PAGE (in french; sorry for the inconvenience)
//////////////////
<html>
<head> <title>ERROR IN SQL
</title>
</head>
<H2>MERCI DE PREVENIR BALEASE DE CETTE ERREUR AU
</H2>
04.92.38.38.00<br>
ERROR : -1 AT INSERT INTO contract ( id, starting_date, created ) VALUES (
'999999999933', now(), now() )
</body></html>
Content-type: text/html
<html>
<head> <title>ERROR IN SQL
</title>
</head>
<H2>MERCI DE PREVENIR BALEASE DE CETTE ERREUR AU
</H2>
04.92.38.38.00<br>
ERROR : -1 AT INSERT INTO contract ( id, starting_date, created ) VALUES (
'999999999933', now(), now() )
</body></html>
Content-type: text/html
>How-To-Repeat:
/**************************************************/
this one will do duplicate header and body
int main(int argc, char *argv[])
{
printf("Content-type: text/plain\n\n");
switch (fork())
{
case 0 :
/* child */
fclose(stdout);
sleep(15);
exit (0);
/* Parent : return to caller */
default :
break;
}
exit (0);
}
/**************************************************/
this one will perfectly work
int main(int argc, char *argv[])
{
switch (fork())
{
case 0 :
/* child */
fclose(stdout);
sleep(15);
exit (0);
/* Parent : return to caller */
default :
break;
}
printf("Content-type: text/plain\n\n"); <----- moved after the fork process
exit (0);
}
>Fix:
hum... don't know, bu i'd greatly appreciate any help (i will be in production
status in short term and really don't want to switch to **** webserver)
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