Update contrib/libs/c-ares to 1.28.1

db71d0a3bd9ec3cf1e1ccb5a9cfac8abfd43fdb7

1 files changed, 166 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/src/lib/ares_event_wake_pipe.c b/contrib/libs/c-ares/src/lib/ares_event_wake_pipe.c
new file mode 100644
index 0000000000..a2cd6f609a
--- /dev/null
+++ b/contrib/libs/c-ares/src/lib/ares_event_wake_pipe.c
@@ -0,0 +1,166 @@
+/* MIT License
+ *
+ * Copyright (c) 2024 Brad House
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+#include "ares_setup.h"
+#include "ares.h"
+#include "ares_private.h"
+#include "ares_event.h"
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#  include <fcntl.h>
+#endif
+
+#ifdef HAVE_PIPE
+typedef struct {
+  int filedes[2];
+} ares_pipeevent_t;
+
+static void ares_pipeevent_destroy(ares_pipeevent_t *p)
+{
+  if (p->filedes[0] != -1) {
+    close(p->filedes[0]);
+  }
+  if (p->filedes[1] != -1) {
+    close(p->filedes[1]);
+  }
+
+  ares_free(p);
+}
+
+static void ares_pipeevent_destroy_cb(void *arg)
+{
+  ares_pipeevent_destroy(arg);
+}
+
+static ares_pipeevent_t *ares_pipeevent_init(void)
+{
+  ares_pipeevent_t *p = ares_malloc_zero(sizeof(*p));
+  if (p == NULL) {
+    return NULL;
+  }
+
+  p->filedes[0] = -1;
+  p->filedes[1] = -1;
+
+#  ifdef HAVE_PIPE2
+  if (pipe2(p->filedes, O_NONBLOCK | O_CLOEXEC) != 0) {
+    ares_pipeevent_destroy(p);
+    return NULL;
+  }
+#  else
+  if (pipe(p->filedes) != 0) {
+    ares_pipeevent_destroy(p);
+    return NULL;
+  }
+
+#    ifdef O_NONBLOCK
+  {
+    int val;
+    val = fcntl(p->filedes[0], F_GETFL, 0);
+    if (val >= 0) {
+      val |= O_NONBLOCK;
+    }
+    fcntl(p->filedes[0], F_SETFL, val);
+
+    val = fcntl(p->filedes[1], F_GETFL, 0);
+    if (val >= 0) {
+      val |= O_NONBLOCK;
+    }
+    fcntl(p->filedes[1], F_SETFL, val);
+  }
+#    endif
+
+#    ifdef O_CLOEXEC
+  fcntl(p->filedes[0], F_SETFD, O_CLOEXEC);
+  fcntl(p->filedes[1], F_SETFD, O_CLOEXEC);
+#    endif
+#  endif
+
+#  ifdef F_SETNOSIGPIPE
+  fcntl(p->filedes[0], F_SETNOSIGPIPE, 1);
+  fcntl(p->filedes[1], F_SETNOSIGPIPE, 1);
+#  endif
+
+  return p;
+}
+
+static void ares_pipeevent_signal(const ares_event_t *e)
+{
+  const ares_pipeevent_t *p;
+
+  if (e == NULL || e->data == NULL) {
+    return;
+  }
+
+  p = e->data;
+  (void)write(p->filedes[1], "1", 1);
+}
+
+static void ares_pipeevent_cb(ares_event_thread_t *e, ares_socket_t fd,
+                              void *data, ares_event_flags_t flags)
+{
+  unsigned char           buf[32];
+  const ares_pipeevent_t *p = NULL;
+
+  (void)e;
+  (void)fd;
+  (void)flags;
+
+  if (data == NULL) {
+    return;
+  }
+
+  p = data;
+
+  while (read(p->filedes[0], buf, sizeof(buf)) == sizeof(buf)) {
+    /* Do nothing */
+  }
+}
+
+ares_event_t *ares_pipeevent_create(ares_event_thread_t *e)
+{
+  ares_event_t     *event = NULL;
+  ares_pipeevent_t *p     = NULL;
+  ares_status_t     status;
+
+  p = ares_pipeevent_init();
+  if (p == NULL) {
+    return NULL;
+  }
+
+  status = ares_event_update(&event, e, ARES_EVENT_FLAG_READ, ares_pipeevent_cb,
+                             p->filedes[0], p, ares_pipeevent_destroy_cb,
+                             ares_pipeevent_signal);
+  if (status != ARES_SUCCESS) {
+    ares_pipeevent_destroy(p);
+    return NULL;
+  }
+
+  return event;
+}
+
+#endif