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Annotation of embedaddon/curl/lib/select.h, revision 1.1.1.1

1.1       misho       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 */