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--- ifreq_ethtool [2018/09/02 06:52] – rpjday
+++ ifreq_ethtool [2018/09/02 06:56] (current) – [Userspace and struct ifreq] rpjday
@@ Line 16: / Line 16: @@
         * [[https://github.com/torvalds/linux/blob/master/include/uapi/linux/ethtool.h|ethtool.h]]
-===== struct ifreq =====
+===== Userspace and struct ifreq =====
+From ethtool's ''internal.h'':
+<code>
+/* Context for sub-commands */
+struct cmd_context {
+        const char *devname;    /* net device name */
+        int fd;                 /* socket suitable for ethtool ioctl */
+        struct ifreq ifr;       /* ifreq suitable for ethtool ioctl */
+        int argc;               /* number of arguments to the sub-command */
+        char **argp;            /* arguments to the sub-command */
+};
+</code>
+and from ''ethtool.c'', the wrapper for ioctl calls:
+<code>
+#ifndef TEST_ETHTOOL
+int send_ioctl(struct cmd_context *ctx, void *cmd)
+{
+        ctx->ifr.ifr_data = cmd;
+        return ioctl(ctx->fd, SIOCETHTOOL, &ctx->ifr);
+}
+#endif
+</code>
 From ''if.h'':