From: <bugzilla(at)apache.org>
Date: Wed Aug 21 2002 - 21:31:56 EDT

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cgi lock when writing to stderr

• Additional Comments From notgod@notgod.com 2002-08-22 01:31 ------- This is an apache-2.0 only issue. 1.3 does not exhibit this problem, and is seriously hampering development for us.

"Deferring your stderr logging until the entire body is read and the entire response is written." doesn't work for large scripts, sites, development environments, etc.

Also, this system will hang with as little as 4k of std_err action at leasr on RH 6.soemthing, apache 2.0.40... FreeBSD seems immune to this wackyness....

for example:
// Credit to: K.C. Wong
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>

#define SIZE 4075

void out_err()
{

	char buffer[SIZE];
	int i = 0;

	for (i = 0; i < SIZE - 1; ++i)
		buffer[i] = 'a' + (char )(i % 26);

	buffer[SIZE - 1] = '\0';

//
fcntl(2, F_SETFL, fcntl(2, F_GETFL) | O_NONBLOCK);

	fprintf(stderr, "short test\n");
	fflush(stderr);

	fprintf(stderr, "test error=%s\n", buffer);
	fflush(stderr);

} // out_err()

int main(int argc, char ** argv)
{

	fprintf(stdout, "Context-Type: text/html\r\n");
	fprintf(stdout, "\r\n\r\n");
	out_err();
	fprintf(stdout, "\n");
	fprintf(stdout, "\n");
	fprintf(stdout, "
hello world
\n");
	fprintf(stdout, "\n");
	fprintf(stdout, "\n");
	fflush(stdout);
	exit(0);

} // main()

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