Why this code wrote empty file?

Code:

---

#include <fcgi_stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(void)
{

    int count = 0;
    while(FCGI_Accept() >= 0) {
   

        char *contentLength = getenv("CONTENT_LENGTH");
        int len;

        if (contentLength != NULL) {
            len = strtol(contentLength, NULL, 10);           
        }
        else {
            len = 0;
        }
        printf("Content-type: text/html\r\n"
              "\r\n"
              "<title>FastCGI Hello!</title>"
              "<h1>FastCGI Hello!</h1>"
              "Request number %d running on host <i>%s</i>\n",
                ++count, getenv("SERVER_NAME"));

        printf("<br />CONTENT_LENGTH = %d <br />\r\n", len);
        printf("<form enctype='multipart/form-data' method='post' action='?'><input type='text' name='text1' /><input type='file' name='file1'/><input type='submit' /></form>");
        printf("<hr />");

        fflush(stdout);

        FCGI_FILE * fileOut = FCGI_fopen("/tmp/fcgi.out", "w");
        if (fileOut) {
            int done = 0;
            while(done < len) {
                char buffer[1024];
           
                int packetRead;

                packetRead = FCGI_fread(buffer, 1, sizeof(buffer), stdin);
                if (packetRead < 0) {
                    break;
                }
                if (packetRead > 0) {
                    FCGI_fwrite(buffer, 1, packetRead, fileOut);
                    done += packetRead;
                }


            }
            FCGI_fclose(fileOut);
        }

        FCGI_Finish();
    }   
}

---

In this code sample fcgi2 library is used. After click on page button file fcgi.out was empty. Why?

> if (packetRead < 0)
This will get you out of the loop without doing anything.

Perhaps add some diagnostics to your code - rather than assume success and posting on a forum when it doesn't work.

Code:

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                packetRead = FCGI_fread(buffer, 1, sizeof(buffer), stdin);
                if (packetRead < 0) {
                    fprintf(stderr,"FCGI_fread returned %d\n", packetRead);
                    break;
                }

---

> ++count, getenv("SERVER_NAME"));
The count will be zero every time you run a new copy of this program.
So if the server is really expecting some incremented number, this isn't going to work.