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From Justin Erenkrantz <jerenkra...@ebuilt.com>
Subject Re: [PATCH] Fix POD reading...
Date Fri, 20 Jul 2001 22:33:54 GMT
[ Moving this back to dev@apr... ]

On Fri, Jul 20, 2001 at 05:28:42PM -0400, Jeff Trawick wrote:
> > I'm seeing ret being equivalent to 20507 which looks to be 
> > APR_ETIMEUP.  Oh dear, don't we need to check if the return 
> > value is APR_ETIMEUP?  -- justin
> 
> I sure didn't see that
> 
> [Fri Jul 20 16:35:14 2001] [emerg] (11)Resource temporarily
> unavailable: n 0
> 
> I think we shouldn't use socket read functions for
> files^H^H^H^H^Hpipes (whatever)
> 
> how can you get APR_ETIMEUP?

Oh, damn.  My testpipe.c was setting a timeout.  I'm donning
a dunce hat.  So, APR_TIMEUP is bogus on my part.

But, I can still create count oddities *without* a timeout (i.e.
ret is 0 and one is 0).  So, the same problem is evident.  I just 
don't receive APR_TIMEUP.

My testpipe.c uses apr_file_read.  You can have it do apr_recv if 
you define PIPE_AS_SOCKET.  I agree, we should have threaded MPM
do apr_file_read instead.

I'm inlining a corrected version that has a 0 timeout.  I'm still
no closer as to finding out why I'm getting 0 ret and 0 length 
returned from apr_file_read or apr_recv.  Neither side should have 
closed the pipe.  I'm obviously missing something.  -- justin

---
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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#include <stdio.h>
#include "apr_file_io.h"
#include "apr_errno.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "apr_network_io.h"
#include <stdlib.h>
#include <unistd.h>

apr_file_t *readp = NULL;
apr_file_t *writep = NULL;

/*#define PIPE_AS_SOCKET*/
/*#define SOLARIS_HACK*/
/*#define PRINT_RET*/

void pipe_child()
{
    char b = ' ';
    int one = 1;
    int i = 0;
    apr_status_t ret;
#ifdef PIPE_AS_SOCKET
    apr_socket_t *s;
    apr_socket_from_file(&s, readp);
#endif
    while (i < 1000)
    {
#ifdef PIPE_AS_SOCKET
        ret = apr_recv(s, &b, &one);
#else
        ret = apr_file_read(readp, &b, &one);
#endif
        if (APR_STATUS_IS_EAGAIN(ret)) {
            /* It lost the lottery. It must continue to suffer
             * through a life of servitude. */
        }
        else {
#ifdef SOLARIS_HACK
            if (one == 1)
                printf("%c", b);
#elif defined(PRINT_RET)
            if (one != 1)
                printf("%d %d\n", ret, one);
#else
            printf("%c", b);
#endif
        }
        i++;
    }
}

void pipe_parent()
{
    char c = '!';
    int one = 1;
    int i = 0;
    while (i < 1000)
    {
        apr_file_write(writep, &c, &one);
        i++;
    } 
}

void go()
{
    fflush(stdout);
    if (fork())
    {
        fork();
        fork();
        fork();
        fork();
        fork();
        fork();
        pipe_child();
    }
    else
    {
        pipe_parent();
    }
}

int main(void)
{
    apr_pool_t *context;
    apr_size_t nbytes;
    apr_status_t rv;
    char *buf;
    char msgbuf[120];

    if (apr_initialize() != APR_SUCCESS) {
        exit(-1);
    }
    atexit(apr_terminate);
    if (apr_pool_create(&context, NULL) != APR_SUCCESS) {
        exit(-1);
    }

    if ((rv = apr_file_pipe_create(&readp, &writep, context)) != APR_SUCCESS) {
        exit(-1);
    }
    
    if ((rv = apr_file_pipe_timeout_set(readp, 0)) != 
        APR_SUCCESS) {
        exit(-1);
    }        

    go();
    return 1;
}


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