sckt_recv.c (3589B)
1 /* SPDX-License-Identifier: LGPL-2.1-or-later OR (GPL-2.0-or-later WITH eCos-exception-2.0) */ 2 /* 3 This file is part of GNU libmicrohttpd. 4 Copyright (C) 2024-2025 Evgeny Grin (Karlson2k) 5 6 GNU libmicrohttpd is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 GNU libmicrohttpd is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 Alternatively, you can redistribute GNU libmicrohttpd and/or 17 modify it under the terms of the GNU General Public License as 18 published by the Free Software Foundation; either version 2 of 19 the License, or (at your option) any later version, together 20 with the eCos exception, as follows: 21 22 As a special exception, if other files instantiate templates or 23 use macros or inline functions from this file, or you compile this 24 file and link it with other works to produce a work based on this 25 file, this file does not by itself cause the resulting work to be 26 covered by the GNU General Public License. However the source code 27 for this file must still be made available in accordance with 28 section (3) of the GNU General Public License v2. 29 30 This exception does not invalidate any other reasons why a work 31 based on this file might be covered by the GNU General Public 32 License. 33 34 You should have received copies of the GNU Lesser General Public 35 License and the GNU General Public License along with this library; 36 if not, see <https://www.gnu.org/licenses/>. 37 */ 38 39 /** 40 * @file src/mhd2/sckt_recv.c 41 * @brief The definition of the mhd_sckt_recv() function 42 * @author Karlson2k (Evgeny Grin) 43 */ 44 45 #include "mhd_sys_options.h" 46 47 #include "sys_base_types.h" 48 49 #include "mhd_socket_type.h" 50 #include "sys_sockets_headers.h" 51 #include "mhd_sockets_macros.h" 52 53 #include "mhd_assert.h" 54 55 #include "mhd_limits.h" 56 57 #include "mhd_socket_error.h" 58 59 #include "mhd_conn_socket.h" 60 61 #include "mhd_socket_error_funcs.h" 62 63 #include "sckt_recv.h" 64 65 66 MHD_INTERNAL MHD_FN_PAR_NONNULL_ALL_ 67 MHD_FN_PAR_OUT_SIZE_ (3,2) MHD_FN_PAR_OUT_ (4) enum mhd_SocketError 68 mhd_sckt_recv (struct mhd_ConnSocket *restrict sk, 69 size_t buf_size, 70 char buf[MHD_FN_PAR_DYN_ARR_SIZE_ (buf_size)], 71 size_t *restrict received) 72 { 73 ssize_t res; 74 enum mhd_SocketError err; 75 76 mhd_assert (MHD_INVALID_SOCKET != sk->fd); 77 78 if (MHD_SCKT_SEND_MAX_SIZE_ < buf_size) 79 buf_size = MHD_SCKT_SEND_MAX_SIZE_; 80 81 res = mhd_sys_recv (sk->fd, buf, buf_size); 82 if (0 <= res) 83 { 84 /* When the socket is blocking, always clean "recv-ready" flag 85 after successful read as complete data could be already retrieved 86 and no more data is pending. 87 Note: blocking sockets are never used with edge-triggering. */ 88 if ((buf_size > (size_t) res) 89 || ! sk->props.is_nonblck) 90 mhd_SCKT_NET_ST_CLEAR_FLAG (&(sk->ready), 91 mhd_SOCKET_NET_STATE_RECV_READY); 92 93 *received = (size_t) res; 94 95 return mhd_SOCKET_ERR_NO_ERROR; /* Success exit point */ 96 } 97 98 err = mhd_socket_error_get_from_sys_err (mhd_SCKT_GET_LERR ()); 99 100 if (mhd_SOCKET_ERR_AGAIN == err) 101 mhd_SCKT_NET_ST_CLEAR_FLAG (&(sk->ready), 102 mhd_SOCKET_NET_STATE_RECV_READY); 103 104 return err; /* Failure exit point */ 105 }