Add support for reloading files

Closes #8.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/reload.c b/src/reload.c
new file mode 100644
index 0000000..a307d45
--- /dev/null
+++ b/src/reload.c
@@ -0,0 +1,49 @@
+#include <sys/inotify.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "reload.h"
+
+void imv_init_reload(struct imv_reload *rld)
+{
+  rld->fd = inotify_init1(IN_NONBLOCK);
+  if(rld->fd == -1) {
+    perror("imv_init_reload");
+  }
+
+  rld->wd = 0;
+}
+
+void imv_reload_watch(struct imv_reload *rld, const char *path)
+{
+  if(rld->wd != 0) {
+    inotify_rm_watch(rld->fd, rld->wd);
+  }
+
+  rld->wd = inotify_add_watch(rld->fd, path, IN_CLOSE_WRITE);
+  if(rld->wd == -1) {
+    perror("imv_reload_watch");
+  }
+}
+
+int imv_reload_changed(struct imv_reload *rld)
+{
+  struct inotify_event ev;
+  ssize_t len = read(rld->fd, &ev, sizeof(ev));
+
+  if(len < 0) {
+    if(errno != EAGAIN) {
+      perror("imv_reload_changed");
+    }
+  } else if(ev.mask & IN_CLOSE_WRITE) {
+    return 1;
+  }
+
+  return 0;
+}
+
+void imv_destroy_reload(struct imv_reload *rld)
+{
+  close(rld->fd);
+}