Added an example for exec.

examples/exec.c

@@ -0,0 +1,67 @@
+/* simple exec example */
+#include <stdio.h>
+
+#include <libssh/libssh.h>
+#include "examples_common.h"
+
+int main(void) {
+  ssh_session session;
+  ssh_channel channel;
+  ssh_buffer buf;
+  int rc;
+
+  session = connect_ssh("localhost", NULL, 0);
+  if (session == NULL) {
+    return 1;
+  }
+
+  channel = channel_new(session);;
+  if (channel == NULL) {
+    ssh_disconnect(session);
+    ssh_finalize();
+    return 1;
+  }
+
+  rc = channel_open_session(channel);
+  if (rc < 0) {
+    channel_close(channel);
+    ssh_disconnect(session);
+    ssh_finalize();
+    return 1;
+  }
+
+  rc = channel_request_exec(channel, "ps aux");
+  if (rc < 0) {
+    channel_close(channel);
+    ssh_disconnect(session);
+    ssh_finalize();
+    return 1;
+  }
+
+
+  if (channel_is_open(channel)) {
+    while (channel_poll(channel, 0) >= 0) {
+      buf = buffer_new();
+      rc = channel_read_buffer(channel, buf, 0, 0);
+      if (rc < 0) {
+        buffer_free(buf);
+        channel_close(channel);
+        ssh_disconnect(session);
+        ssh_finalize();
+        return 1;
+      }
+
+      printf("%s\n", (char *) buffer_get(buf));
+
+      buffer_free(buf);
+    }
+  }
+
+  channel_send_eof(channel);
+  channel_close(channel);
+
+  ssh_disconnect(session);
+  ssh_finalize();
+
+  return 0;
+}