(C) SSH Parallel Remote Commands on Single Server

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Shows how to execute multiple commands in parallel on a single SSH server and retrieve the command output for each.

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#include <C_CkSsh.h>

void ChilkatSample(void)
    {
    HCkSsh ssh;
    int port;
    BOOL success;
    int channel1;
    int channel2;
    int channel3;
    int pollTimeoutMs;
    int numFinished;
    int channel;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    ssh = CkSsh_Create();

    port = 22;
    success = CkSsh_Connect(ssh,"the-ssh-server.com",port);
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Authenticate using login/password:
    success = CkSsh_AuthenticatePw(ssh,"theSshLogin","theSshPassword");
    if (success != TRUE) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Start several commands on the server.
    channel1 = CkSsh_QuickCmdSend(ssh,"df");
    if (channel1 < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    channel2 = CkSsh_QuickCmdSend(ssh,"date");
    if (channel2 < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    channel3 = CkSsh_QuickCmdSend(ssh,"echo hello world");
    if (channel3 < 0) {
        printf("%s\n",CkSsh_lastErrorText(ssh));
        CkSsh_Dispose(ssh);
        return;
    }

    // Now collect the results of each command.
    pollTimeoutMs = 50;
    numFinished = 0;
    while (numFinished < 3) {
        // Check to see if anything has finished.
        // QuickCmdCheck returns -1 if there are no errors and nothing else finished
        // QuickCmdCheck returns -2 if there was an error (such as a lost connection)
        // QuickCmdCheck returns a channel number if a channel finished.
        channel = CkSsh_QuickCmdCheck(ssh,pollTimeoutMs);
        if (channel == -2) {
            printf("%s\n",CkSsh_lastErrorText(ssh));
            CkSsh_Dispose(ssh);
            return;
        }

        if (channel >= 0) {
            printf("---- channel %d finished ----\n",channel);
            printf("%s\n",CkSsh_getReceivedText(ssh,channel,"ansi"));
            numFinished = numFinished + 1;
        }

    }

    // --------------
    // Sample output:

    // 	---- channel 105 finished ----
    // 	hello world
    // 
    // 	---- channel 104 finished ----
    // 	Thu Dec 22 17:43:58 CST 2016
    // 
    // 	---- channel 103 finished ----
    // 	Filesystem    512-blocks      Used  Available Capacity  iused     ifree %iused  Mounted on
    // 	/dev/disk2    2176716032 265739728 1910464304    13% 33281464 238808038   12%   /
    // 	devfs                382       382          0   100%      662         0  100%   /dev
    // 	map -hosts             0         0          0   100%        0         0  100%   /net
    // 	map auto_home          0         0          0   100%        0         0  100%   /home
    // 	/dev/disk3s2      374668    374668          0   100%    93665         0  100%   /Volumes/Google Chrome


    CkSsh_Dispose(ssh);

    }