add cmd_run_async()

gebs.h

@@ -338,6 +338,10 @@ typedef Gebs_NString_List Gebs_Cmd;
 int gebs_cmd_run_sync_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd);
 int gebs_cmd_fd_run_sync_alloc(Gebs_Allocator *alloc, int fd, Gebs_Cmd *cmd);
 
+#define gebs_cmd_run_async(cmd) gebs_cmd_run_async_alloc(&gebs_default_allocator, (cmd))
+
+pid_t gebs_cmd_run_async_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd);
+
 #define GEBS_CMD(...) \
 ({ \
     char *__args[] = { __VA_ARGS__ }; \
@@ -644,6 +648,35 @@ int gebs_cmd_fd_run_sync_collect_alloc(Gebs_Allocator *alloc, int fd, Gebs_Cmd *
     }
 }
 
+pid_t gebs_cmd_run_async_alloc(Gebs_Allocator *alloc, Gebs_Cmd *cmd)
+{
+    Gebs_String_Builder sb = {0};
+    defer { gebs_sb_free_alloc(alloc, &sb); }
+    gebs_nsl_join_alloc(alloc, cmd, &sb, " ");
+    gebs_sb_finish_alloc(alloc, &sb);
+    GEBS_LOGI("cmd `%s`\n", sb.items);
+
+    // Clone the list
+    Gebs_Cmd new_cmd = {0};
+    defer { gebs_cmd_free_alloc(alloc, &new_cmd); }
+    for (size_t i = 0; i < cmd->count; i++) {
+        gebs_cmd_append_alloc(alloc, &new_cmd, cmd->items[i]);
+    }
+    gebs_cmd_append_alloc((alloc), &new_cmd, nil);
+
+    pid_t pid = vfork();
+    switch (pid) {
+        case -1:
+            GEBS_LOGE("Could not vfork\n");
+            return -1;
+        case 0:
+            execvp(new_cmd.items[0], (char * const *)new_cmd.items);
+            exit(EXIT_FAILURE);
+        default:
+            return pid;
+    }
+}
+
 // ----------------------------------------------------------------------------
 // Allocators
 // ----------------------------------------------------------------------------
@@ -958,6 +991,8 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
 #define cmd_fd_run_sync_alloc       gebs_cmd_fd_run_sync_alloc
 #define cmd_fd_run_alloc            gebs_cmd_fd_run_alloc
 #define cmd_fd_run                  gebs_cmd_fd_run
+#define cmd_run_async_alloc         gebs_cmd_run_async_alloc
+#define cmd_run_async               gebs_cmd_run_async
 
 #define needs_rebuild               gebs_needs_rebuild
 #define needs_rebuild_many          gebs_needs_rebuild_many