Add a simple unix controller

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

src/mainctl.c

@@ -0,0 +1,93 @@
+#include "common.h"
+
+#include "ctl.h"
+#include "option.h"
+#include "str.h"
+
+#include <stdio.h>
+#include <sys/socket.h>
+
+#ifndef PACKAGE_VERSION
+#define PACKAGE_VERSION "unknown"
+#endif
+
+static struct {
+    char *dev;
+    int version;
+} gt = {};
+
+static int
+gt_setup_option(int argc, char **argv)
+{
+    // clang-format off
+
+    struct option opts[] = {
+        { "dev",     &gt.dev, option_str    },
+        { "version", NULL,    option_option },
+        {  NULL                                               },
+    };
+
+    // clang-format on
+
+    if (option(opts, argc, argv))
+        return 1;
+
+    gt.version = option_is_set(opts, "version");
+
+    return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+    if (gt_setup_option(argc, argv))
+        return 1;
+
+    if (gt.version) {
+        gt_print(PACKAGE_VERSION "\n");
+        return 0;
+    }
+
+    int ctl_fd = ctl_init("/run/" PACKAGE_NAME, "client");
+
+    if (ctl_fd == -1) {
+        perror("ctl_init");
+        return 1;
+    }
+
+    if (ctl_connect(ctl_fd, "/run/" PACKAGE_NAME, gt.dev) == -1) {
+        perror("ctl_connect");
+        return 1;
+    }
+
+    struct ctl_msg msg = {
+        .type = CTL_PING,
+    };
+
+    if (send(ctl_fd, &msg, sizeof(msg), 0) == -1) {
+        perror("send");
+        return 1;
+    }
+
+    struct ctl_msg reply;
+
+    if (recv(ctl_fd, &reply, sizeof(reply), 0) == -1) {
+        perror("recv");
+        return 1;
+    }
+
+    switch (reply.type) {
+    case CTL_PONG:
+        gt_print("PONG!\n");
+        break;
+    case CTL_UNKNOWN:
+        gt_print("Unknown command: %i\n", reply.unknown.type);
+        break;
+    default:
+        gt_print("Bad reply from server: %i\n", reply.type);
+    }
+
+    close(ctl_fd);
+
+    return 0;
+}