fastcgi prints an additional empty line for each packet of type FCGI_STDERR

patch for lighttpd 1.4.x's mod_fastcgi to skip printing empty error packets

patch for lighttpd 1.5 (trunk)'s mod_fastcgi to skip printing empty error packets

in lighttpd 1.5 the implementation used for mod_proxy_backend_fastcgi doesn't show this problem as shown in :

mod_proxy_backend_fastcgi.c.476: (trace) (fastcgi-stderr) this is an error message
mod_proxy_backend_fastcgi.c.476: (trace) (fastcgi-stderr) this is an error message

a fastcgi program using the fcgi_stdio emulation is shown below:

#include "fcgi_config.h"
#include "fcgi_stdio.h"

int main()
{
   while (FCGI_Accept() >=0) {
      printf("Content-type: text/html\r\n");
      printf("\r\n");
      printf("This is some content");
      fprintf(stderr, "This is some error");
   }
   return 0;
}

a fastcgi C program using the native API :

#include "fcgi_config.h"
#include "fcgiapp.h"

int main()
{
   FCGX_Stream *in, *out, *err;
   FCGX_ParamArray envp;

   while (FCGX_Accept(&int, &out, &err, &envp) >= 0) {
      FCGX_FPrintF(out, "This is some content");
      FCGX_FPrintF(err, "This is some error");
   }

   return 0;
}

this patch however doesn't solve problem with PHP-FCGI error logs:

2007-01-30 02:26:31: (mod_fastcgi.c.2504) FastCGI-stderr: error

2007-01-30 02:26:37: (mod_fastcgi.c.2504) FastCGI-stderr: error

2007-01-30 02:26:38: (mod_fastcgi.c.2504) FastCGI-stderr: error

$ cat z.php
tore
<?

error_log("error");

the problem with PHP is a bug in PHP not in lighttpd or fastcgi as error_log is printing a an extra "CRLF" at the end of the message

http://bugs.php.net/bug.php?id=31472

interestingly enough though this patch "fixes" the problem by redirecting stderr into the log file as can be seen if instead the following script is used :

<?php
  $stderr = fopen("php://stderr", "w");
  fputs ($stderr, "error\n");
  fclose ($stderr);
?>

applied in [1606] and [1607].

this patch addresses the PHP problem:

http://cvs.pld-linux.org/cgi-bin/cvsweb.cgi/SOURCES/php-fcgi-error_log-no-newlines.patch