1 files changed, 55 insertions, 0 deletions
diff --git a/misc/ioctltst.c b/misc/ioctltst.c
new file mode 100644
index 0000000..3e8ea99
--- /dev/null
+++ b/misc/ioctltst.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+/*
+ * open a socket, get the process group information of the socket, and use the
+ * socket to get the network interface configuration list
+ */
+main()
+{
+  int sock;
+  int ioctl_result;
+
+  /* get a socket */
+  sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+  if (sock < 0)
+    {
+      perror("Cannot create socket");
+      exit(1);
+    }
+
+  /* use ioctl() to get the process group information */
+  {
+    int get_process_group;
+    
+    ioctl_result = ioctl(sock, SIOCGPGRP, (char *) &get_process_group);
+
+    if (ioctl_result < 0)
+      {
+        int my_errno = errno;
+
+        fprintf(stderr, "errno %d ", my_errno);
+        perror("ioctl(get process group)");
+      }
+  }
+
+  /* use ioctl() to get the interface configuration list */
+  {
+    static struct ifconf ifc;	/* init to 0 */
+    
+    ioctl_result = ioctl(sock, SIOCGIFCONF, (char *) &ifc);
+
+    if (ioctl_result < 0)
+      {
+        int my_errno = errno;
+
+        fprintf(stderr, "errno %d ", my_errno);
+        perror("ioctl(get interface configuration list)");
+      }
+  }
+}