初始化内容

2026-09-16 14:07:40 +08:00
parent 6934b390bf
commit 4f643c1e7c
18350 changed files with 6088489 additions and 305 deletions
@@ -0,0 +1,94 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+#ifndef HAVE_SELECT
+#error "We cannot compile without select() support."
+#endif
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#elif defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+
+#ifdef MSDOS
+#include <dos.h>  /* delay() */
+#endif
+
+#include "curlx/timediff.h"
+#include "curlx/wait.h"
+
+/*
+ * Internal function used for waiting a specific amount of ms in
+ * Curl_socket_check() and Curl_poll() when no file descriptor is provided to
+ * wait on, being used to delay execution. Winsock select() and poll() timeout
+ * mechanisms need a valid socket descriptor in a not null file descriptor set
+ * to work. Waiting indefinitely with this function is not allowed, a zero or
+ * negative timeout value is returned immediately. Timeout resolution,
+ * accuracy, as well as maximum supported value is system dependent, neither
+ * factor is a critical issue for the intended use of this function in the
+ * library.
+ *
+ * Return values:
+ *   -1 = system call error, or invalid timeout value
+ *    0 = specified timeout has elapsed, or interrupted
+ */
+int curlx_wait_ms(timediff_t timeout_ms)
+{
+  int r = 0;
+
+  if(!timeout_ms)
+    return 0;
+  if(timeout_ms < 0) {
+    SET_SOCKERRNO(SOCKEINVAL);
+    return -1;
+  }
+#ifdef MSDOS
+  delay((unsigned int)timeout_ms);
+#elif defined(_WIN32)
+  /* prevent overflow, timeout_ms is typecast to ULONG/DWORD. */
+#if TIMEDIFF_T_MAX >= ULONG_MAX
+  if(timeout_ms >= ULONG_MAX)
+    timeout_ms = ULONG_MAX - 1;
+    /* do not use ULONG_MAX, because that is equal to INFINITE */
+#endif
+  Sleep((DWORD)timeout_ms);
+#else
+  /* avoid using poll() for this since it behaves incorrectly with no sockets
+     on Apple operating systems */
+  {
+    struct timeval pending_tv;
+    r = select(0, NULL, NULL, NULL, curlx_mstotv(&pending_tv, timeout_ms));
+  }
+#endif /* _WIN32 */
+  if(r) {
+    if((r == -1) && (SOCKERRNO == SOCKEINTR))
+      /* make EINTR from select or poll not a "lethal" error */
+      r = 0;
+    else
+      r = -1;
+  }
+  return r;
+}