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curl

    1: #ifndef HEADER_CURL_SELECT_H
    2: #define HEADER_CURL_SELECT_H
    3: /***************************************************************************
    4:  *                                  _   _ ____  _
    5:  *  Project                     ___| | | |  _ \| |
    6:  *                             / __| | | | |_) | |
    7:  *                            | (__| |_| |  _ <| |___
    8:  *                             \___|\___/|_| \_\_____|
    9:  *
   10:  * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@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_select(curl_socket_t maxfd,
   76:                 fd_set *fds_read,
   77:                 fd_set *fds_write,
   78:                 fd_set *fds_err,
   79:                 time_t timeout_ms);
   80: 
   81: int Curl_socket_check(curl_socket_t readfd, curl_socket_t readfd2,
   82:                       curl_socket_t writefd,
   83:                       timediff_t timeout_ms);
   84: #define SOCKET_READABLE(x,z) \
   85:   Curl_socket_check(x, CURL_SOCKET_BAD, CURL_SOCKET_BAD, z)
   86: #define SOCKET_WRITABLE(x,z) \
   87:   Curl_socket_check(CURL_SOCKET_BAD, CURL_SOCKET_BAD, x, z)
   88: 
   89: int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
   90: int Curl_wait_ms(int timeout_ms);
   91: 
   92: #ifdef TPF
   93: int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
   94:                        fd_set* excepts, struct timeval* tv);
   95: #endif
   96: 
   97: /* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1], which
   98:    unfortunately makes it impossible for us to easily check if they're valid
   99: */
  100: #if defined(USE_WINSOCK) || defined(TPF)
  101: #define VALID_SOCK(x) 1
  102: #define VERIFY_SOCK(x) Curl_nop_stmt
  103: #else
  104: #define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
  105: #define VERIFY_SOCK(x) do { \
  106:   if(!VALID_SOCK(x)) { \
  107:     SET_SOCKERRNO(EINVAL); \
  108:     return -1; \
  109:   } \
  110: } while(0)
  111: #endif
  112: 
  113: #endif /* HEADER_CURL_SELECT_H */