diff options
Diffstat (limited to 'src/communication.c')
| -rw-r--r-- | src/communication.c | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/src/communication.c b/src/communication.c deleted file mode 100644 index 9ede401..0000000 --- a/src/communication.c +++ /dev/null @@ -1,175 +0,0 @@ -/** - * coopgammad -- Cooperative gamma server - * Copyright (C) 2016 Mattias Andrée (maandree@kth.se) - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ -#include "communication.h" -#include "state.h" -#include "servers/coopgamma.h" - -#include <sys/socket.h> -#include <errno.h> -#include <string.h> - - - -/** - * Send a message - * - * @param conn The index of the connection - * @param buf The data to send - * @param n The size of `buf` - * @return Zero on success, -1 on error, 1 if disconncted - * EINTR, EAGAIN, EWOULDBLOCK, and ECONNRESET count - * as success (ECONNRESET cause 1 to be returned), - * and are handled appropriately. - */ -int send_message(size_t conn, char* restrict buf, size_t n) -{ - struct ring* restrict ring = outbound + conn; - int fd = connections[conn]; - int saved_errno; - size_t ptr = 0; - ssize_t sent; - size_t chunksize = n; - size_t sendsize; - size_t old_n; - char* old_buf; - - while ((old_buf = ring_peek(ring, &old_n))) - { - size_t old_ptr = 0; - while (old_ptr < n) - { - sendsize = old_n - old_ptr < chunksize ? old_n - old_ptr : chunksize; - sent = send(fd, old_buf + old_ptr, sendsize, MSG_NOSIGNAL); - if (sent < 0) - { - if (errno == EPIPE) - errno = ECONNRESET; - if (errno != EMSGSIZE) - goto fail; - chunksize >>= 1; - if (chunksize == 0) - goto fail; - continue; - } - old_ptr += (size_t)sent; - ring_pop(ring, (size_t)sent); - } - } - - while (ptr < n) - { - sendsize = n - ptr < chunksize ? n - ptr : chunksize; - sent = send(fd, buf + ptr, sendsize, MSG_NOSIGNAL); - if (sent < 0) - { - if (errno == EPIPE) - errno = ECONNRESET; - if (errno != EMSGSIZE) - goto fail; - chunksize >>= 1; - if (chunksize == 0) - goto fail; - continue; - } - ptr += (size_t)sent; - } - - free(buf); - return 0; - - fail: - switch (errno) - { - case EINTR: - case EAGAIN: -#if EAGAIN != EWOULDBLOCK - case EWOULDBLOCK: -#endif - if (ring_push(ring, buf + ptr, n - ptr) < 0) - goto proper_fail; - free(buf); - return 0; - case ECONNRESET: - free(buf); - if (connection_closed(fd) < 0) - return -1; - return 1; - default: - break; - } - proper_fail: - saved_errno = errno; - free(buf); - errno = saved_errno; - return -1; -} - - -/** - * Send a custom error without an error number - * - * @param conn The index of the connection - * @param message_id The ID of the message to which this message is a response - * @param desc The error description to send - * @return 1: Client disconnected - * 0: Success (possibily delayed) - * -1: An error occurred - */ -int (send_error)(size_t conn, const char* restrict message_id, const char* restrict desc) -{ - char* restrict buf; - size_t n; - - MAKE_MESSAGE(&buf, &n, 0, - "Command: error\n" - "In response to: %s\n" - "Error: custom\n" - "Length: %zu\n" - "\n" - "%s\n", - message_id, strlen(desc) + 1, desc); - - return send_message(conn, buf, n); -} - - -/** - * Send a standard error - * - * @param conn The index of the connection - * @param message_id The ID of the message to which this message is a response - * @param number The value of `errno`, 0 to indicate success - * @return 1: Client disconnected - * 0: Success (possibily delayed) - * -1: An error occurred - */ -int (send_errno)(size_t conn, const char* restrict message_id, int number) -{ - char* restrict buf; - size_t n; - - MAKE_MESSAGE(&buf, &n, 0, - "Command: error\n" - "In response to: %s\n" - "Error: %i\n" - "\n", - message_id, number); - - return send_message(conn, buf, n); -} - |