DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nspr.h"

#include "plgetopt.h"

#include <stdlib.h>
#include <string.h>


#ifndef IOV_MAX
#define IOV_MAX 16
#endif

#define BASE_PORT 9867

int PR_CALLBACK Writev(int argc, char **argv)
{

    PRStatus rv;
    PRNetAddr serverAddr;
    PRFileDesc *clientSock, *debug = NULL;

    char *buffer = NULL;
    PRIOVec *iov = NULL;
    PRBool passed = PR_TRUE;
    PRIntervalTime timein, elapsed, timeout;
    PRIntervalTime tmo_min = 0x7fffffff, tmo_max = 0, tmo_elapsed = 0;
    PRInt32 tmo_counted = 0, iov_index, loop, bytes, number_fragments;
    PRInt32 message_length = 100, fragment_length = 100, messages = 100;
    struct Descriptor { PRInt32 length; PRUint32 checksum; } descriptor;

    /*
     * USAGE
     * -h       dns name of host serving the connection (default = self)
     * -m       number of messages to send              (default = 100)
     * -s       size of each message                    (default = 100)
     * -f       size of each message fragment           (default = 100)
     */

	PLOptStatus os;
	PLOptState *opt = PL_CreateOptState(argc, argv, "dh:m:s:f:");

    PR_STDIO_INIT();
    rv = PR_InitializeNetAddr(PR_IpAddrLoopback, BASE_PORT, &serverAddr);
    PR_ASSERT(PR_SUCCESS == rv);

	while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
    {
        if (PL_OPT_BAD == os) continue;
        switch (opt->option)
        {
        case 'h':  /* the remote host */
            {
                PRIntn es = 0;
                PRHostEnt host;
                char buffer[1024];
                (void)PR_GetHostByName(opt->value, buffer, sizeof(buffer), &host);
                es = PR_EnumerateHostEnt(es, &host, BASE_PORT, &serverAddr);
                PR_ASSERT(es > 0);
            }
            break;
        case 'd':  /* debug mode */
            debug = PR_GetSpecialFD(PR_StandardError);
            break;
        case 'm':  /* number of messages to send */
            messages = atoi(opt->value);
            break;
        case 's':  /* total size of each message */
            message_length = atoi(opt->value);
            break;
        case 'f':  /* size of each message fragment */
            fragment_length = atoi(opt->value);
            break;
        default:
            break;
        }
    }
	PL_DestroyOptState(opt);

    buffer = (char*)malloc(message_length);

    number_fragments = (message_length + fragment_length - 1) / fragment_length + 1;
    while (IOV_MAX < number_fragments)
    {
        fragment_length = message_length / (IOV_MAX - 2);
        number_fragments = (message_length + fragment_length - 1) /
            fragment_length + 1;
        if (NULL != debug) PR_fprintf(debug, 
            "Too many fragments - reset fragment length to %ld\n", fragment_length);
    }
    iov = (PRIOVec*)malloc(number_fragments * sizeof(PRIOVec));

    iov[0].iov_base = (char*)&descriptor;
    iov[0].iov_len = sizeof(descriptor);
    for (iov_index = 1; iov_index < number_fragments; ++iov_index)
    {
        iov[iov_index].iov_base = buffer + (iov_index - 1) * fragment_length;
        iov[iov_index].iov_len = fragment_length;
    }

    for (bytes = 0; bytes < message_length; ++bytes)
        buffer[bytes] = (char)bytes;

    timeout = PR_SecondsToInterval(1);

    for (loop = 0; loop < messages; ++loop)
    {
        if (NULL != debug)
            PR_fprintf(debug, "[%d]socket ... ", loop);
        clientSock = PR_NewTCPSocket();
        if (clientSock)
        {
            timein = PR_IntervalNow();
            if (NULL != debug)
                PR_fprintf(debug, "connecting ... ");
            rv = PR_Connect(clientSock, &serverAddr, timeout);
            if (PR_SUCCESS == rv)
            {
                descriptor.checksum = 0;
                descriptor.length = (loop < (messages - 1)) ? message_length : 0;
                if (0 == descriptor.length) number_fragments = 1;
                else
                    for (iov_index = 0; iov_index < descriptor.length; ++iov_index)
                    {
                        PRUint32 overflow = descriptor.checksum & 0x80000000;
                        descriptor.checksum = (descriptor.checksum << 1);
                        if (0x00000000 != overflow) descriptor.checksum += 1;
                        descriptor.checksum += buffer[iov_index];
                    }
                if (NULL != debug) PR_fprintf(
                    debug, "sending %d bytes ... ", descriptor.length);

                /* then, at the last moment ... */
                descriptor.length = PR_ntohl(descriptor.length);
                descriptor.checksum = PR_ntohl(descriptor.checksum);

                bytes = PR_Writev(clientSock, iov, number_fragments, timeout);
                if (NULL != debug)
                    PR_fprintf(debug, "closing ... ");
                rv = PR_Shutdown(clientSock, PR_SHUTDOWN_BOTH);
                rv = PR_Close(clientSock);
                if (NULL != debug) PR_fprintf(
                    debug, "%s\n", ((PR_SUCCESS == rv) ? "good" : "bad"));
                elapsed = PR_IntervalNow() - timein;
                if (elapsed < tmo_min) tmo_min = elapsed;
                else if (elapsed > tmo_max) tmo_max = elapsed;
                tmo_elapsed += elapsed;
                tmo_counted += 1;
            }
            else
            {
                if (NULL != debug) PR_fprintf(
                    debug, "failed - retrying (%d, %d)\n",
                    PR_GetError(), PR_GetOSError());
                PR_Close(clientSock);
            }
        }
        else if (NULL != debug)
        {
            PR_fprintf(debug, "unable to create client socket\n");
            passed = PR_FALSE;
        }
    }
    if (NULL != debug) {
        if (0 == tmo_counted) {
            PR_fprintf(debug, "No connection made\n");
        } else {
        PR_fprintf(
            debug, "\nTimings: %d [%d] %d (microseconds)\n",
            PR_IntervalToMicroseconds(tmo_min),
            PR_IntervalToMicroseconds(tmo_elapsed / tmo_counted),
            PR_IntervalToMicroseconds(tmo_max));
	}
    }

    PR_DELETE(buffer);
    PR_DELETE(iov);

    PR_fprintf(
        PR_GetSpecialFD(PR_StandardError),
        "%s\n", (passed) ? "PASSED" : "FAILED");
    return (passed) ? 0 : 1;
}

int main(int argc, char **argv)
{
    return (PR_VersionCheck(PR_VERSION)) ?
        PR_Initialize(Writev, argc, argv, 4) : -1;
}  /* main */

/* writev.c */