Rocket start from everywhere

lib/device.c

@@ -5,6 +5,7 @@
 #include <math.h>
 #include <assert.h>
 #include <string.h>
+#include <errno.h>
 
 static int find_track(struct sync_device *d, const char *name)
 {
@@ -266,13 +267,6 @@ static int save_track(const struct sync_track *t, const char *path)
 {
 	int i;
 
-	int cwd = open(".", O_RDONLY);
-	if (!cwd)
-		return -1;
-
-	if (!chdir("build/sync"))
-		return -1;
-
 	FILE *fp = fopen(path, "wb");
 	if (!fp)
 		return -1;
@@ -287,18 +281,58 @@ static int save_track(const struct sync_track *t, const char *path)
 
 	fclose(fp);
 
-	if (!fchdir(cwd))
-		return -1;
 	return 0;
 }
 
-void sync_save_tracks(const struct sync_device *d)
+void sync_save_tracks(const struct sync_device *d, int row)
 {
 	int i;
+
+	int cwd = open(".", O_RDONLY);
+	if (cwd == -1) {
+		dprintf(2, "can't open current directory\n");
+		return;
+	}
+
+	if (chdir("build/sync")) {
+		dprintf(2, "can't enter build/sync directory\n");
+		return;
+	}
+
 	for (i = 0; i < (int)d->num_tracks; ++i) {
 		const struct sync_track *t = d->tracks[i];
 		save_track(t, sync_track_path(d->base, t->name));
 	}
+
+	if (fchdir(cwd)) {
+		dprintf(2, "%s\n", strerror(errno));
+	}
+
+	close(cwd);
+
+	printf("forking\n");
+	pid_t pid = fork();
+	if (pid == 0)
+	{
+		char path[1024];
+		char def_track_start[64];
+		snprintf(def_track_start, 64, "TRACK_START_ROW=%d", row);
+		getcwd(path, 1024);
+		dprintf(2, "making in %s...\n", path);
+
+		execv("/usr/bin/make", (char *[]){ "make", "run", def_track_start, NULL });
+	}
+	else if (i > 0)
+	{
+		int status;
+		printf("waiting...\n");
+		waitpid(pid, &status, 0);
+	}
+	else
+	{
+		printf("failing...\n");
+		perror("fork failed");
+	}
 }
 
 static int get_track_data(struct sync_device *d, struct sync_track *t)
@@ -400,7 +434,6 @@ int sync_update(struct sync_device *d, int row, struct sync_cb *cb,
 	/* look for new commands */
 	while (socket_poll(d->sock)) {
 		unsigned char cmd = 0, flag;
-		uint32_t row;
 		if (xrecv(d->sock, (char *)&cmd, 1, 0))
 			goto sockerr;
 
@@ -426,7 +459,7 @@ int sync_update(struct sync_device *d, int row, struct sync_cb *cb,
 				cb->pause(cb_param, flag);
 			break;
 		case SAVE_TRACKS:
-			sync_save_tracks(d);
+			sync_save_tracks(d, row);
 			break;
 		default:
 			fprintf(stderr, "unknown cmd: %02x\n", cmd);