added a C sample of grabbing output

client/experimental_lib/example_c/01make_test.sh

@@ -1,3 +1,4 @@
 #!/bin/bash
 
 gcc -o test test.c -I../../include -lpm3rrg_rdv4 -L../build -lpthread
+gcc -o test_grab test_grab.c -I../../include -lpm3rrg_rdv4 -L../build -lpthread

client/experimental_lib/example_c/02run_test_grab.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+LD_LIBRARY_PATH=../build ./test_grab

client/experimental_lib/example_c/test_grab.c

@@ -0,0 +1,67 @@
+#include "pm3.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+
+    int pipefd[2];
+    char buf[8196 + 1];
+    size_t n;
+
+    if (pipe(pipefd) == -1) {
+        exit(-1);
+    }
+
+    int pid = fork();
+    if (pid == -1) {
+        perror("fork");
+        exit(-1);
+    }
+
+    // child
+    if (pid == 0) {
+        printf("[INFO] inside child\n");
+
+        // Redirect stdout to the write end of the pipe
+        dup2(pipefd[1], STDOUT_FILENO);
+
+        close(pipefd[0]);  // Child: close read end of the pipe
+        close(pipefd[1]);  // Close original write end
+
+        pm3 *p;
+        p = pm3_open("/dev/ttyS9");
+        //printf("Device: %s\n", pm3_name_get(p));
+
+        // Execute the command
+        pm3_console(p, "hw status");
+        pm3_close(p);
+        _exit(-1);
+    } else {
+
+        printf("[INFO] inside parent\n");
+        // Parent: close write end of the pipe
+        close(pipefd[1]);
+
+        // Read from the pipe
+        while (1) { 
+            n = read(pipefd[0], buf, sizeof(buf));
+            if (n == -1) {
+                continue;
+            }
+            if (n == 0) {
+                break;
+            } else {
+                // null termination
+                buf[n] = 0;
+                if (strstr(buf, "Unique ID") != NULL) {
+                    printf("%s", buf);
+                }
+            }
+        }
+
+        // Close read end
+        close(pipefd[0]);
+    }   
+}