* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2014, 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
*
***************************************************************************/
-#include "setup.h"
+#include "curl_setup.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#include <dos.h> /* delay() */
#endif
+#ifdef __VXWORKS__
+#include <strings.h> /* bzero() in FD_SET */
+#endif
+
#include <curl/curl.h>
#include "urldata.h"
#define elapsed_ms (int)curlx_tvdiff(curlx_tvnow(), initial_tv)
-#ifdef CURL_ACKNOWLEDGE_EINTR
-#define error_not_EINTR (1)
-#else
-#define error_not_EINTR (error != EINTR)
-#endif
+int Curl_ack_eintr = 0;
+#define error_not_EINTR (Curl_ack_eintr || error != EINTR)
/*
* Internal function used for waiting a specific amount of ms
* Timeout resolution, accuracy, as well as maximum supported
* value is system dependent, neither factor is a citical issue
* for the intended use of this function in the library.
- * On non-DOS and non-Winsock platforms, when compiled with
- * CURL_ACKNOWLEDGE_EINTR defined, EINTR condition is honored
- * and function might exit early without awaiting full timeout,
- * otherwise EINTR will be ignored and full timeout will elapse.
*
* Return values:
* -1 = system call error, invalid timeout value, or interrupted
if(error && error_not_EINTR)
break;
pending_ms = timeout_ms - elapsed_ms;
- if(pending_ms <= 0)
+ if(pending_ms <= 0) {
+ r = 0; /* Simulate a "call timed out" case */
break;
+ }
} while(r == -1);
#endif /* USE_WINSOCK */
if(r)
* A negative timeout value makes this function wait indefinitely,
* unles no valid file descriptor is given, when this happens the
* negative timeout is ignored and the function times out immediately.
- * When compiled with CURL_ACKNOWLEDGE_EINTR defined, EINTR condition
- * is honored and function might exit early without awaiting timeout,
- * otherwise EINTR will be ignored.
*
* Return values:
* -1 = system call error or fd >= FD_SETSIZE
long timeout_ms) /* milliseconds to wait */
{
#ifdef HAVE_POLL_FINE
- struct pollfd pfd[2];
+ struct pollfd pfd[3];
int num;
#else
struct timeval pending_tv;
break;
if(timeout_ms > 0) {
pending_ms = (int)(timeout_ms - elapsed_ms);
- if(pending_ms <= 0)
+ if(pending_ms <= 0) {
+ r = 0; /* Simulate a "call timed out" case */
break;
+ }
}
} while(r == -1);
pending_tv.tv_sec = 0;
pending_tv.tv_usec = 0;
}
- r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
+
+ /* WinSock select() must not be called with an fd_set that contains zero
+ fd flags, or it will return WSAEINVAL. But, it also can't be called
+ with no fd_sets at all! From the documentation:
+
+ Any two of the parameters, readfds, writefds, or exceptfds, can be
+ given as null. At least one must be non-null, and any non-null
+ descriptor set must contain at least one handle to a socket.
+
+ We know that we have at least one bit set in at least two fd_sets in
+ this case, but we may have no bits set in either fds_read or fd_write,
+ so check for that and handle it. Luckily, with WinSock, we can _also_
+ ask how many bits are set on an fd_set.
+
+ It is unclear why WinSock doesn't just handle this for us instead of
+ calling this an error.
+
+ Note also that WinSock ignores the first argument, so we don't worry
+ about the fact that maxfd is computed incorrectly with WinSock (since
+ curl_socket_t is unsigned in such cases and thus -1 is the largest
+ value).
+ */
+ r = select((int)maxfd + 1,
+#ifndef USE_WINSOCK
+ &fds_read,
+ &fds_write,
+#else
+ fds_read.fd_count ? &fds_read : NULL,
+ fds_write.fd_count ? &fds_write : NULL,
+#endif
+ &fds_err, ptimeout);
if(r != -1)
break;
error = SOCKERRNO;
break;
if(timeout_ms > 0) {
pending_ms = timeout_ms - elapsed_ms;
- if(pending_ms <= 0)
+ if(pending_ms <= 0) {
+ r = 0; /* Simulate a "call timed out" case */
break;
+ }
}
} while(r == -1);
* A negative timeout value makes this function wait indefinitely,
* unles no valid file descriptor is given, when this happens the
* negative timeout is ignored and the function times out immediately.
- * When compiled with CURL_ACKNOWLEDGE_EINTR defined, EINTR condition
- * is honored and function might exit early without awaiting timeout,
- * otherwise EINTR will be ignored.
*
* Return values:
* -1 = system call error or fd >= FD_SETSIZE
break;
if(timeout_ms > 0) {
pending_ms = timeout_ms - elapsed_ms;
- if(pending_ms <= 0)
+ if(pending_ms <= 0) {
+ r = 0; /* Simulate a "call timed out" case */
break;
+ }
}
} while(r == -1);
}
}
+#ifdef USE_WINSOCK
+ /* WinSock select() can't handle zero events. See the comment about this in
+ Curl_check_socket(). */
+ if(fds_read.fd_count == 0 && fds_write.fd_count == 0
+ && fds_err.fd_count == 0) {
+ r = Curl_wait_ms(timeout_ms);
+ return r;
+ }
+#endif
+
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
do {
pending_tv.tv_sec = 0;
pending_tv.tv_usec = 0;
}
- r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
+ r = select((int)maxfd + 1,
+#ifndef USE_WINSOCK
+ &fds_read, &fds_write, &fds_err,
+#else
+ /* WinSock select() can't handle fd_sets with zero bits set, so
+ don't give it such arguments. See the comment about this in
+ Curl_check_socket().
+ */
+ fds_read.fd_count ? &fds_read : NULL,
+ fds_write.fd_count ? &fds_write : NULL,
+ fds_err.fd_count ? &fds_err : NULL,
+#endif
+ ptimeout);
if(r != -1)
break;
error = SOCKERRNO;
break;
if(timeout_ms > 0) {
pending_ms = timeout_ms - elapsed_ms;
- if(pending_ms <= 0)
+ if(pending_ms <= 0) {
+ r = 0; /* Simulate a "call timed out" case */
break;
+ }
}
} while(r == -1);