mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 16:18:48 -05:00
4c663ba9a8
to find that it crashed miserably, and this was due to some select()isms left in the code. This was due to API restrictions in c-ares 1.3.x, but with the upcoming c-ares 1.4.0 this is no longer the case so now libcurl runs much better with c-ares and the multi interface with > 1024 file descriptors in use.
504 lines
13 KiB
C
504 lines
13 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) 1998 - 2007, 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 http://curl.haxx.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.
|
|
*
|
|
* $Id$
|
|
***************************************************************************/
|
|
|
|
#include "setup.h"
|
|
|
|
#ifdef HAVE_SYS_SELECT_H
|
|
#include <sys/select.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_TIME_H
|
|
#include <sys/time.h>
|
|
#endif
|
|
|
|
#if !defined(HAVE_SELECT) && !defined(HAVE_POLL_FINE)
|
|
#error "We can't compile without select() or poll() support."
|
|
#endif
|
|
|
|
#ifdef __BEOS__
|
|
/* BeOS has FD_SET defined in socket.h */
|
|
#include <socket.h>
|
|
#endif
|
|
|
|
#ifdef MSDOS
|
|
#include <dos.h> /* delay() */
|
|
#endif
|
|
|
|
#include <curl/curl.h>
|
|
|
|
#include "urldata.h"
|
|
#include "connect.h"
|
|
#include "select.h"
|
|
|
|
/* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1] */
|
|
|
|
#if defined(USE_WINSOCK) || defined(TPF)
|
|
#define VERIFY_SOCK(x) do { } while (0)
|
|
#define VERIFY_NFDS(x) do { } while (0)
|
|
#else
|
|
#define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
|
|
#define VERIFY_SOCK(x) do { \
|
|
if(!VALID_SOCK(x)) { \
|
|
SET_SOCKERRNO(EINVAL); \
|
|
return -1; \
|
|
} \
|
|
} while(0)
|
|
#define VALID_NFDS(n) (((n) >= 0) && ((n) <= FD_SETSIZE))
|
|
#define VERIFY_NFDS(x) do { \
|
|
if(!VALID_NFDS(x)) { \
|
|
SET_SOCKERRNO(EINVAL); \
|
|
return -1; \
|
|
} \
|
|
} while(0)
|
|
#endif
|
|
|
|
/* Convenience local macros */
|
|
|
|
#define elapsed_ms (int)curlx_tvdiff(curlx_tvnow(), initial_tv)
|
|
|
|
#ifdef CURL_ACKNOWLEDGE_EINTR
|
|
#define error_is_EINTR (error == EINTR)
|
|
#else
|
|
#define error_is_EINTR (0)
|
|
#endif
|
|
|
|
#define SMALL_POLLNFDS 0x20
|
|
|
|
/*
|
|
* Internal function used for waiting a specific amount of ms
|
|
* in Curl_socket_ready() and Curl_poll() when no file descriptor
|
|
* is provided to wait on, just 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 will return immediately.
|
|
* Timeout resolution, accuracy, as well as maximum supported
|
|
* value is system dependant, 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
|
|
* 0 = specified timeout has elapsed
|
|
*/
|
|
static int wait_ms(int timeout_ms)
|
|
{
|
|
#if !defined(MSDOS) && !defined(USE_WINSOCK)
|
|
#ifndef HAVE_POLL_FINE
|
|
struct timeval pending_tv;
|
|
#endif
|
|
struct timeval initial_tv;
|
|
int pending_ms;
|
|
int error;
|
|
#endif
|
|
int r = 0;
|
|
|
|
if (!timeout_ms)
|
|
return 0;
|
|
if (timeout_ms < 0) {
|
|
SET_SOCKERRNO(EINVAL);
|
|
return -1;
|
|
}
|
|
#if defined(MSDOS)
|
|
delay(timeout_ms);
|
|
#elif defined(USE_WINSOCK)
|
|
Sleep(timeout_ms);
|
|
#else
|
|
pending_ms = timeout_ms;
|
|
initial_tv = curlx_tvnow();
|
|
do {
|
|
#if defined(HAVE_POLL_FINE)
|
|
r = poll(NULL, 0, pending_ms);
|
|
#else
|
|
pending_tv.tv_sec = pending_ms / 1000;
|
|
pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
|
r = select(0, NULL, NULL, NULL, &pending_tv);
|
|
#endif /* HAVE_POLL_FINE */
|
|
if (r != -1)
|
|
break;
|
|
error = SOCKERRNO;
|
|
if ((error == EINVAL) || error_is_EINTR)
|
|
break;
|
|
pending_ms = timeout_ms - elapsed_ms;
|
|
if (pending_ms <= 0)
|
|
break;
|
|
} while (r == -1);
|
|
#endif /* USE_WINSOCK */
|
|
if (r)
|
|
r = -1;
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* This is an internal function used for waiting for read or write
|
|
* events on a pair of file descriptors. It uses poll() when a fine
|
|
* poll() is available, in order to avoid limits with FD_SETSIZE,
|
|
* otherwise select() is used. An error is returned if select() is
|
|
* being used and a file descriptor is too large for FD_SETSIZE.
|
|
* 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
|
|
* 0 = timeout
|
|
* CURL_CSELECT_IN | CURL_CSELECT_OUT | CURL_CSELECT_ERR
|
|
*/
|
|
int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
|
|
int timeout_ms)
|
|
{
|
|
#ifdef HAVE_POLL_FINE
|
|
struct pollfd pfd[2];
|
|
int num;
|
|
#else
|
|
struct timeval pending_tv;
|
|
struct timeval *ptimeout;
|
|
fd_set fds_read;
|
|
fd_set fds_write;
|
|
fd_set fds_err;
|
|
curl_socket_t maxfd;
|
|
#endif
|
|
struct timeval initial_tv;
|
|
int pending_ms = 0;
|
|
int error;
|
|
int r;
|
|
int ret;
|
|
|
|
if((readfd == CURL_SOCKET_BAD) && (writefd == CURL_SOCKET_BAD)) {
|
|
r = wait_ms(timeout_ms);
|
|
return r;
|
|
}
|
|
|
|
/* Avoid initial timestamp, avoid gettimeofday() call, when elapsed
|
|
time in this function does not need to be measured. This happens
|
|
when function is called with a zero timeout or a negative timeout
|
|
value indicating a blocking call should be performed. */
|
|
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms;
|
|
initial_tv = curlx_tvnow();
|
|
}
|
|
|
|
#ifdef HAVE_POLL_FINE
|
|
|
|
num = 0;
|
|
if (readfd != CURL_SOCKET_BAD) {
|
|
pfd[num].fd = readfd;
|
|
pfd[num].events = POLLRDNORM|POLLIN|POLLRDBAND|POLLPRI;
|
|
pfd[num].revents = 0;
|
|
num++;
|
|
}
|
|
if (writefd != CURL_SOCKET_BAD) {
|
|
pfd[num].fd = writefd;
|
|
pfd[num].events = POLLWRNORM|POLLOUT;
|
|
pfd[num].revents = 0;
|
|
num++;
|
|
}
|
|
|
|
do {
|
|
if (timeout_ms < 0)
|
|
pending_ms = -1;
|
|
else if (!timeout_ms)
|
|
pending_ms = 0;
|
|
r = poll(pfd, num, pending_ms);
|
|
if (r != -1)
|
|
break;
|
|
error = SOCKERRNO;
|
|
if ((error == EINVAL) || error_is_EINTR)
|
|
break;
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms - elapsed_ms;
|
|
if (pending_ms <= 0)
|
|
break;
|
|
}
|
|
} while (r == -1);
|
|
|
|
if (r < 0)
|
|
return -1;
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
ret = 0;
|
|
num = 0;
|
|
if (readfd != CURL_SOCKET_BAD) {
|
|
if (pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
|
|
ret |= CURL_CSELECT_IN;
|
|
if (pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
|
|
ret |= CURL_CSELECT_ERR;
|
|
num++;
|
|
}
|
|
if (writefd != CURL_SOCKET_BAD) {
|
|
if (pfd[num].revents & (POLLWRNORM|POLLOUT))
|
|
ret |= CURL_CSELECT_OUT;
|
|
if (pfd[num].revents & (POLLERR|POLLHUP|POLLNVAL))
|
|
ret |= CURL_CSELECT_ERR;
|
|
}
|
|
|
|
return ret;
|
|
|
|
#else /* HAVE_POLL_FINE */
|
|
|
|
FD_ZERO(&fds_err);
|
|
maxfd = (curl_socket_t)-1;
|
|
|
|
FD_ZERO(&fds_read);
|
|
if (readfd != CURL_SOCKET_BAD) {
|
|
VERIFY_SOCK(readfd);
|
|
FD_SET(readfd, &fds_read);
|
|
FD_SET(readfd, &fds_err);
|
|
maxfd = readfd;
|
|
}
|
|
|
|
FD_ZERO(&fds_write);
|
|
if (writefd != CURL_SOCKET_BAD) {
|
|
VERIFY_SOCK(writefd);
|
|
FD_SET(writefd, &fds_write);
|
|
FD_SET(writefd, &fds_err);
|
|
if (writefd > maxfd)
|
|
maxfd = writefd;
|
|
}
|
|
|
|
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
|
|
|
|
do {
|
|
if (timeout_ms > 0) {
|
|
pending_tv.tv_sec = pending_ms / 1000;
|
|
pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
|
}
|
|
else if (!timeout_ms) {
|
|
pending_tv.tv_sec = 0;
|
|
pending_tv.tv_usec = 0;
|
|
}
|
|
r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
|
|
if (r != -1)
|
|
break;
|
|
error = SOCKERRNO;
|
|
if ((error == EINVAL) || (error == EBADF) || error_is_EINTR)
|
|
break;
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms - elapsed_ms;
|
|
if (pending_ms <= 0)
|
|
break;
|
|
}
|
|
} while (r == -1);
|
|
|
|
if (r < 0)
|
|
return -1;
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
ret = 0;
|
|
if (readfd != CURL_SOCKET_BAD) {
|
|
if (FD_ISSET(readfd, &fds_read))
|
|
ret |= CURL_CSELECT_IN;
|
|
if (FD_ISSET(readfd, &fds_err))
|
|
ret |= CURL_CSELECT_ERR;
|
|
}
|
|
if (writefd != CURL_SOCKET_BAD) {
|
|
if (FD_ISSET(writefd, &fds_write))
|
|
ret |= CURL_CSELECT_OUT;
|
|
if (FD_ISSET(writefd, &fds_err))
|
|
ret |= CURL_CSELECT_ERR;
|
|
}
|
|
|
|
return ret;
|
|
|
|
#endif /* HAVE_POLL_FINE */
|
|
|
|
}
|
|
|
|
/*
|
|
* This is a wrapper around poll(). If poll() does not exist, then
|
|
* select() is used instead. An error is returned if select() is
|
|
* being used and a file descriptor is too large for FD_SETSIZE.
|
|
* 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
|
|
* 0 = timeout
|
|
* N = number of structures with non zero revent fields
|
|
*/
|
|
int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms)
|
|
{
|
|
#ifndef HAVE_POLL_FINE
|
|
struct timeval pending_tv;
|
|
struct timeval *ptimeout;
|
|
fd_set fds_read;
|
|
fd_set fds_write;
|
|
fd_set fds_err;
|
|
curl_socket_t maxfd;
|
|
#endif
|
|
struct timeval initial_tv;
|
|
bool fds_none = TRUE;
|
|
unsigned int i;
|
|
int pending_ms = 0;
|
|
int error;
|
|
int r;
|
|
|
|
if (ufds) {
|
|
for (i = 0; i < nfds; i++) {
|
|
if (ufds[i].fd != CURL_SOCKET_BAD) {
|
|
fds_none = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (fds_none) {
|
|
r = wait_ms(timeout_ms);
|
|
return r;
|
|
}
|
|
|
|
/* Avoid initial timestamp, avoid gettimeofday() call, when elapsed
|
|
time in this function does not need to be measured. This happens
|
|
when function is called with a zero timeout or a negative timeout
|
|
value indicating a blocking call should be performed. */
|
|
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms;
|
|
initial_tv = curlx_tvnow();
|
|
}
|
|
|
|
#ifdef HAVE_POLL_FINE
|
|
|
|
do {
|
|
if (timeout_ms < 0)
|
|
pending_ms = -1;
|
|
else if (!timeout_ms)
|
|
pending_ms = 0;
|
|
r = poll(ufds, nfds, pending_ms);
|
|
if (r != -1)
|
|
break;
|
|
error = SOCKERRNO;
|
|
if ((error == EINVAL) || error_is_EINTR)
|
|
break;
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms - elapsed_ms;
|
|
if (pending_ms <= 0)
|
|
break;
|
|
}
|
|
} while (r == -1);
|
|
|
|
#else /* HAVE_POLL_FINE */
|
|
|
|
FD_ZERO(&fds_read);
|
|
FD_ZERO(&fds_write);
|
|
FD_ZERO(&fds_err);
|
|
maxfd = (curl_socket_t)-1;
|
|
|
|
for (i = 0; i < nfds; i++) {
|
|
ufds[i].revents = 0;
|
|
if (ufds[i].fd == CURL_SOCKET_BAD)
|
|
continue;
|
|
VERIFY_SOCK(ufds[i].fd);
|
|
if (ufds[i].events & (POLLIN|POLLOUT|POLLPRI|
|
|
POLLRDNORM|POLLWRNORM|POLLRDBAND)) {
|
|
if (ufds[i].fd > maxfd)
|
|
maxfd = ufds[i].fd;
|
|
if (ufds[i].events & (POLLRDNORM|POLLIN))
|
|
FD_SET(ufds[i].fd, &fds_read);
|
|
if (ufds[i].events & (POLLWRNORM|POLLOUT))
|
|
FD_SET(ufds[i].fd, &fds_write);
|
|
if (ufds[i].events & (POLLRDBAND|POLLPRI))
|
|
FD_SET(ufds[i].fd, &fds_err);
|
|
}
|
|
}
|
|
|
|
ptimeout = (timeout_ms < 0) ? NULL : &pending_tv;
|
|
|
|
do {
|
|
if (timeout_ms > 0) {
|
|
pending_tv.tv_sec = pending_ms / 1000;
|
|
pending_tv.tv_usec = (pending_ms % 1000) * 1000;
|
|
}
|
|
else if (!timeout_ms) {
|
|
pending_tv.tv_sec = 0;
|
|
pending_tv.tv_usec = 0;
|
|
}
|
|
r = select((int)maxfd + 1, &fds_read, &fds_write, &fds_err, ptimeout);
|
|
if (r != -1)
|
|
break;
|
|
error = SOCKERRNO;
|
|
if ((error == EINVAL) || (error == EBADF) || error_is_EINTR)
|
|
break;
|
|
if (timeout_ms > 0) {
|
|
pending_ms = timeout_ms - elapsed_ms;
|
|
if (pending_ms <= 0)
|
|
break;
|
|
}
|
|
} while (r == -1);
|
|
|
|
if (r < 0)
|
|
return -1;
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = 0;
|
|
for (i = 0; i < nfds; i++) {
|
|
ufds[i].revents = 0;
|
|
if (ufds[i].fd == CURL_SOCKET_BAD)
|
|
continue;
|
|
if (FD_ISSET(ufds[i].fd, &fds_read))
|
|
ufds[i].revents |= POLLIN;
|
|
if (FD_ISSET(ufds[i].fd, &fds_write))
|
|
ufds[i].revents |= POLLOUT;
|
|
if (FD_ISSET(ufds[i].fd, &fds_err))
|
|
ufds[i].revents |= POLLPRI;
|
|
if (ufds[i].revents != 0)
|
|
r++;
|
|
}
|
|
|
|
#endif /* HAVE_POLL_FINE */
|
|
|
|
return r;
|
|
}
|
|
|
|
#ifdef TPF
|
|
/*
|
|
* This is a replacement for select() on the TPF platform.
|
|
* It is used whenever libcurl calls select().
|
|
* The call below to tpf_process_signals() is required because
|
|
* TPF's select calls are not signal interruptible.
|
|
*
|
|
* Return values are the same as select's.
|
|
*/
|
|
int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
|
|
fd_set* excepts, struct timeval* tv)
|
|
{
|
|
int rc;
|
|
|
|
rc = tpf_select_bsd(maxfds, reads, writes, excepts, tv);
|
|
tpf_process_signals();
|
|
return(rc);
|
|
}
|
|
#endif /* TPF */
|