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      1 #ifndef HEADER_CURL_SELECT_H
      2 #define HEADER_CURL_SELECT_H
      3 /***************************************************************************
      4  *                                  _   _ ____  _
      5  *  Project                     ___| | | |  _ \| |
      6  *                             / __| | | | |_) | |
      7  *                            | (__| |_| |  _ <| |___
      8  *                             \___|\___/|_| \_\_____|
      9  *
     10  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) haxx.se>, et al.
     11  *
     12  * This software is licensed as described in the file COPYING, which
     13  * you should have received as part of this distribution. The terms
     14  * are also available at https://curl.haxx.se/docs/copyright.html.
     15  *
     16  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     17  * copies of the Software, and permit persons to whom the Software is
     18  * furnished to do so, under the terms of the COPYING file.
     19  *
     20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     21  * KIND, either express or implied.
     22  *
     23  ***************************************************************************/
     24 
     25 #include "curl_setup.h"
     26 
     27 #ifdef HAVE_POLL_H
     28 #include <poll.h>
     29 #elif defined(HAVE_SYS_POLL_H)
     30 #include <sys/poll.h>
     31 #endif
     32 
     33 /*
     34  * Definition of pollfd struct and constants for platforms lacking them.
     35  */
     36 
     37 #if !defined(HAVE_STRUCT_POLLFD) && \
     38     !defined(HAVE_SYS_POLL_H) && \
     39     !defined(HAVE_POLL_H) && \
     40     !defined(POLLIN)
     41 
     42 #define POLLIN      0x01
     43 #define POLLPRI     0x02
     44 #define POLLOUT     0x04
     45 #define POLLERR     0x08
     46 #define POLLHUP     0x10
     47 #define POLLNVAL    0x20
     48 
     49 struct pollfd
     50 {
     51     curl_socket_t fd;
     52     short   events;
     53     short   revents;
     54 };
     55 
     56 #endif
     57 
     58 #ifndef POLLRDNORM
     59 #define POLLRDNORM POLLIN
     60 #endif
     61 
     62 #ifndef POLLWRNORM
     63 #define POLLWRNORM POLLOUT
     64 #endif
     65 
     66 #ifndef POLLRDBAND
     67 #define POLLRDBAND POLLPRI
     68 #endif
     69 
     70 /* there are three CSELECT defines that are defined in the public header that
     71    are exposed to users, but this *IN2 bit is only ever used internally and
     72    therefore defined here */
     73 #define CURL_CSELECT_IN2 (CURL_CSELECT_ERR << 1)
     74 
     75 int Curl_socket_check(curl_socket_t readfd, curl_socket_t readfd2,
     76                       curl_socket_t writefd,
     77                       time_t timeout_ms);
     78 
     79 #define SOCKET_READABLE(x,z) \
     80   Curl_socket_check(x, CURL_SOCKET_BAD, CURL_SOCKET_BAD, z)
     81 #define SOCKET_WRITABLE(x,z) \
     82   Curl_socket_check(CURL_SOCKET_BAD, CURL_SOCKET_BAD, x, z)
     83 
     84 int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
     85 
     86 /* On non-DOS and non-Winsock platforms, when Curl_ack_eintr is set,
     87  * EINTR condition is honored and function might exit early without
     88  * awaiting full timeout.  Otherwise EINTR will be ignored and full
     89  * timeout will elapse. */
     90 extern int Curl_ack_eintr;
     91 
     92 int Curl_wait_ms(int timeout_ms);
     93 
     94 #ifdef TPF
     95 int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
     96                        fd_set* excepts, struct timeval* tv);
     97 #endif
     98 
     99 /* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1], which
    100    unfortunately makes it impossible for us to easily check if they're valid
    101 */
    102 #if defined(USE_WINSOCK) || defined(TPF)
    103 #define VALID_SOCK(x) 1
    104 #define VERIFY_SOCK(x) Curl_nop_stmt
    105 #else
    106 #define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
    107 #define VERIFY_SOCK(x) do { \
    108   if(!VALID_SOCK(x)) { \
    109     SET_SOCKERRNO(EINVAL); \
    110     return -1; \
    111   } \
    112 } WHILE_FALSE
    113 #endif
    114 
    115 #endif /* HEADER_CURL_SELECT_H */
    116