Catching SIGINT during ssh_channel_request_exec

[timo.pallach@xxxxxx]

Hi,

I slightly modified the exec.c example and added a signal handler to catch the SIGINT signal.
I also added a loop to be able to enter multiple commands, one after the other (like a little shell).
When I execute the command "ping localhost" via ssh_channel_request_exec and send a SIGINT (e.g. ctrl+c) the signal handler is executed but the application exits.

Is there a possibility to stop the command executed via ssh_channel_request_exec using the ctrl+c key combination without exiting application?

Attached you find the modified exec.c sources.
===============================================================================
/* simple exec example */
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <libssh/libssh.h>
#include "examples_common.h"

void handler(int signum)
{
    printf("signum=<%d>\n", signum);
}

int main(void)
{
    ssh_session session;
    ssh_channel channel;
    char buffer[256];
    int nbytes;
    int rc;
    char command[256];

    signal(SIGINT, handler);

    session = connect_ssh("localhost", NULL, 0);
    if (session == NULL) {
        ssh_finalize();
        return 1;
    }

    // Show prompt and only exit if user enters "exit".
    while(1)
    {
        printf("# ");
        if (fgets(command, sizeof(command), stdin) == NULL)
            continue;

        // Exit loop if "exit was entered by user.
        if (strcmp(command, "exit\n") == 0)
            return 0;

        channel = ssh_channel_new(session);;
        if (channel == NULL) {
            ssh_disconnect(session);
            ssh_free(session);
            ssh_finalize();
            return 1;
        }

        rc = ssh_channel_open_session(channel);
        if (rc < 0) {
            goto failed;
        }

        rc = ssh_channel_request_exec(channel, command);
        if (rc < 0) {
            goto failed;
        }

        nbytes = ssh_channel_read(channel, buffer, sizeof(buffer), 0);
        while (nbytes > 0) {
            if (fwrite(buffer, 1, nbytes, stdout) != (unsigned int) nbytes) {
                goto failed;
            }
            nbytes = ssh_channel_read(channel, buffer, sizeof(buffer), 0);
        }

        if (nbytes < 0) {
            goto failed;
        }

        ssh_channel_send_eof(channel);
        ssh_channel_close(channel);
        ssh_channel_free(channel);
    }

    ssh_disconnect(session);
    ssh_free(session);
    ssh_finalize();

    return 0;
failed:
    ssh_channel_close(channel);
    ssh_channel_free(channel);
    ssh_disconnect(session);
    ssh_free(session);
    ssh_finalize();

    return 1;
}
===============================================================================