#include <stdlib.h>
#ifdef _WIN32
#include <process.h>
#else
#include <unistd.h>
extern char ** environ;
#endif
#include "fcgio.h"
#include "fcgi_config.h"  // HAVE_IOSTREAM_WITHASSIGN_STREAMBUFusing namespace std;// Maximum number of bytes allowed to be read from stdin
static const unsigned long STDIN_MAX = 1000000;static void penv(const char * const * envp)
{cout << "<PRE>\n";for ( ; *envp; ++envp){cout << *envp << "\n";}cout << "</PRE>\n";
}static long gstdin(FCGX_Request * request, char ** content)
{char * clenstr = FCGX_GetParam("CONTENT_LENGTH", request->envp);unsigned long clen = STDIN_MAX;if (clenstr){clen = strtol(clenstr, &clenstr, 10);if (*clenstr){cerr << "can't parse \"CONTENT_LENGTH="<< FCGX_GetParam("CONTENT_LENGTH", request->envp)<< "\"\n";clen = STDIN_MAX;}// *always* put a cap on the amount of data that will be readif (clen > STDIN_MAX) clen = STDIN_MAX;*content = new char[clen];cin.read(*content, clen);clen = cin.gcount();}else{// *never* read stdin when CONTENT_LENGTH is missing or unparsable*content = 0;clen = 0;}// Chew up any remaining stdin - this shouldn't be necessary// but is because mod_fastcgi doesn't handle it correctly.// ignore() doesn't set the eof bit in some versions of glibc++// so use gcount() instead of eof()...do cin.ignore(1024); while (cin.gcount() == 1024);return clen;
}int main (void)
{int count = 0;long pid = getpid();streambuf * cin_streambuf  = cin.rdbuf();streambuf * cout_streambuf = cout.rdbuf();streambuf * cerr_streambuf = cerr.rdbuf();FCGX_Request request;FCGX_Init();FCGX_InitRequest(&request, 0, 0);while (FCGX_Accept_r(&request) == 0){// Note that the default bufsize (0) will cause the use of iostream// methods that require positioning (such as peek(), seek(),// unget() and putback()) to fail (in favour of more efficient IO).fcgi_streambuf cin_fcgi_streambuf(request.in);fcgi_streambuf cout_fcgi_streambuf(request.out);fcgi_streambuf cerr_fcgi_streambuf(request.err);#if HAVE_IOSTREAM_WITHASSIGN_STREAMBUFcin  = &cin_fcgi_streambuf;cout = &cout_fcgi_streambuf;cerr = &cerr_fcgi_streambuf;
#elsecin.rdbuf(&cin_fcgi_streambuf);cout.rdbuf(&cout_fcgi_streambuf);cerr.rdbuf(&cerr_fcgi_streambuf);
#endif// Although FastCGI supports writing before reading,// many http clients (browsers) don't support it (so// the connection deadlocks until a timeout expires!).char * content;unsigned long clen = gstdin(&request, &content);cout << "Content-type: text/html\r\n""\r\n""<TITLE>echo-cpp</TITLE>\n""<H1>echo-cpp</H1>\n""<H4>PID: " << pid << "</H4>\n""<H4>Request Number: " << ++count << "</H4>\n";cout << "<H4>Request Environment</H4>\n";penv(request.envp);cout << "<H4>Process/Initial Environment</H4>\n";penv(environ);cout << "<H4>Standard Input - " << clen;if (clen == STDIN_MAX) cout << " (STDIN_MAX)";cout << " bytes</H4>\n";if (clen) cout.write(content, clen);if (content) delete []content;// If the output streambufs had non-zero bufsizes and// were constructed outside of the accept loop (i.e.// their destructor won't be called here), they would// have to be flushed here.
    }#if HAVE_IOSTREAM_WITHASSIGN_STREAMBUFcin  = cin_streambuf;cout = cout_streambuf;cerr = cerr_streambuf;
#elsecin.rdbuf(cin_streambuf);cout.rdbuf(cout_streambuf);cerr.rdbuf(cerr_streambuf);
#endifreturn 0;
}