466 lines
12 KiB
C
466 lines
12 KiB
C
/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or their
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* institutions shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization from the authors.
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*/
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/* Connection management: the core of XCB. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include "xcb.h"
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#include "xcbint.h"
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#if USE_POLL
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#include <poll.h>
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#elif !defined _WIN32
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#include <sys/select.h>
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#endif
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#ifdef _WIN32
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#include "xcb_windefs.h"
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#endif /* _WIN32 */
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/* SHUT_RDWR is fairly recent and is not available on all platforms */
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#if !defined(SHUT_RDWR)
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#define SHUT_RDWR 2
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#endif
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typedef struct {
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uint8_t status;
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uint8_t pad0[5];
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uint16_t length;
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} xcb_setup_generic_t;
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static const int xcb_con_error = XCB_CONN_ERROR;
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static const int xcb_con_closed_mem_er = XCB_CONN_CLOSED_MEM_INSUFFICIENT;
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static const int xcb_con_closed_parse_er = XCB_CONN_CLOSED_PARSE_ERR;
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static const int xcb_con_closed_screen_er = XCB_CONN_CLOSED_INVALID_SCREEN;
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static int set_fd_flags(const int fd)
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{
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/* Win32 doesn't have file descriptors and the fcntl function. This block sets the socket in non-blocking mode */
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#ifdef _WIN32
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u_long iMode = 1; /* non-zero puts it in non-blocking mode, 0 in blocking mode */
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int ret = 0;
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ret = ioctlsocket(fd, FIONBIO, &iMode);
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if(ret != 0)
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return 0;
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return 1;
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#else
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int flags = fcntl(fd, F_GETFL, 0);
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if(flags == -1)
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return 0;
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flags |= O_NONBLOCK;
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if(fcntl(fd, F_SETFL, flags) == -1)
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return 0;
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if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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return 0;
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return 1;
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#endif /* _WIN32 */
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}
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static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
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{
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static const char pad[3];
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xcb_setup_request_t out;
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struct iovec parts[6];
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int count = 0;
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static const uint32_t endian = 0x01020304;
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int ret;
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memset(&out, 0, sizeof(out));
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/* B = 0x42 = MSB first, l = 0x6c = LSB first */
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if(htonl(endian) == endian)
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out.byte_order = 0x42;
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else
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out.byte_order = 0x6c;
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out.protocol_major_version = X_PROTOCOL;
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out.protocol_minor_version = X_PROTOCOL_REVISION;
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out.authorization_protocol_name_len = 0;
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out.authorization_protocol_data_len = 0;
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parts[count].iov_len = sizeof(xcb_setup_request_t);
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parts[count++].iov_base = &out;
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parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
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parts[count++].iov_base = (char *) pad;
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if(auth_info)
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{
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parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
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parts[count++].iov_base = auth_info->name;
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parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
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parts[count++].iov_base = (char *) pad;
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parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
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parts[count++].iov_base = auth_info->data;
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parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
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parts[count++].iov_base = (char *) pad;
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}
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assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
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pthread_mutex_lock(&c->iolock);
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ret = _xcb_out_send(c, parts, count);
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pthread_mutex_unlock(&c->iolock);
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return ret;
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}
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static int read_setup(xcb_connection_t *c)
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{
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/* Read the server response */
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c->setup = malloc(sizeof(xcb_setup_generic_t));
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if(!c->setup)
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return 0;
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if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
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return 0;
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{
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void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
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if(!tmp)
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return 0;
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c->setup = tmp;
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}
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if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
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return 0;
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/* 0 = failed, 2 = authenticate, 1 = success */
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switch(c->setup->status)
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{
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case 0: /* failed */
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{
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xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
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write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
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return 0;
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}
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case 2: /* authenticate */
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{
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xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
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write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
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return 0;
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}
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}
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return 1;
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}
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/* precondition: there must be something for us to write. */
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static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
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{
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int n;
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assert(!c->out.queue_len);
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#ifdef _WIN32
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int i = 0;
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int ret = 0,err = 0;
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struct iovec *vec;
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n = 0;
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/* Could use the WSASend win32 function for scatter/gather i/o but setting up the WSABUF struct from
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an iovec would require more work and I'm not sure of the benefit....works for now */
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vec = *vector;
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while(i < *count)
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{
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ret = send(c->fd,vec->iov_base,vec->iov_len,0);
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if(ret == SOCKET_ERROR)
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{
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err = WSAGetLastError();
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if(err == WSAEWOULDBLOCK)
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{
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return 1;
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}
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}
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n += ret;
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*vec++;
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i++;
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}
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#else
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n = *count;
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if (n > IOV_MAX)
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n = IOV_MAX;
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n = writev(c->fd, *vector, n);
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if(n < 0 && errno == EAGAIN)
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return 1;
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#endif /* _WIN32 */
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if(n <= 0)
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{
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_xcb_conn_shutdown(c, XCB_CONN_ERROR);
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return 0;
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}
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for(; *count; --*count, ++*vector)
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{
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int cur = (*vector)->iov_len;
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if(cur > n)
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cur = n;
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(*vector)->iov_len -= cur;
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(*vector)->iov_base = (char *) (*vector)->iov_base + cur;
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n -= cur;
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if((*vector)->iov_len)
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break;
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}
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if(!*count)
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*vector = 0;
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assert(n == 0);
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return 1;
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}
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/* Public interface */
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const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
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{
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if(c->has_error)
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return 0;
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/* doesn't need locking because it's never written to. */
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return c->setup;
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}
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int xcb_get_file_descriptor(xcb_connection_t *c)
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{
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if(c->has_error)
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return -1;
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/* doesn't need locking because it's never written to. */
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return c->fd;
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}
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int xcb_connection_has_error(xcb_connection_t *c)
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{
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/* doesn't need locking because it's read and written atomically. */
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return c->has_error;
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}
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xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
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{
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xcb_connection_t* c;
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#ifndef _WIN32
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#ifndef USE_POLL
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if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
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{
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close(fd);
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return _xcb_conn_ret_error(XCB_CONN_ERROR);
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}
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#endif
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#endif /* !_WIN32*/
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c = calloc(1, sizeof(xcb_connection_t));
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if(!c) {
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close(fd);
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return _xcb_conn_ret_error(XCB_CONN_CLOSED_MEM_INSUFFICIENT) ;
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}
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c->fd = fd;
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if(!(
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set_fd_flags(fd) &&
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pthread_mutex_init(&c->iolock, 0) == 0 &&
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_xcb_in_init(&c->in) &&
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_xcb_out_init(&c->out) &&
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write_setup(c, auth_info) &&
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read_setup(c) &&
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_xcb_ext_init(c) &&
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_xcb_xid_init(c)
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))
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{
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xcb_disconnect(c);
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return _xcb_conn_ret_error(XCB_CONN_ERROR);
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}
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return c;
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}
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void xcb_disconnect(xcb_connection_t *c)
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{
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if(c->has_error)
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return;
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free(c->setup);
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/* disallow further sends and receives */
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shutdown(c->fd, SHUT_RDWR);
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close(c->fd);
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pthread_mutex_destroy(&c->iolock);
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_xcb_in_destroy(&c->in);
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_xcb_out_destroy(&c->out);
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_xcb_ext_destroy(c);
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_xcb_xid_destroy(c);
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free(c);
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#ifdef _WIN32
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WSACleanup();
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#endif
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}
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/* Private interface */
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void _xcb_conn_shutdown(xcb_connection_t *c, int err)
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{
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c->has_error = err;
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}
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/* Return connection error state.
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* To make thread-safe, I need a seperate static
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* variable for every possible error.
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*/
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xcb_connection_t *_xcb_conn_ret_error(int err)
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{
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switch(err)
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{
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case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
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{
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return (xcb_connection_t *) &xcb_con_closed_mem_er;
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}
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case XCB_CONN_CLOSED_PARSE_ERR:
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{
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return (xcb_connection_t *) &xcb_con_closed_parse_er;
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}
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case XCB_CONN_CLOSED_INVALID_SCREEN:
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{
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return (xcb_connection_t *) &xcb_con_closed_screen_er;
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}
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case XCB_CONN_ERROR:
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default:
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{
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return (xcb_connection_t *) &xcb_con_error;
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}
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}
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}
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int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
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{
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int ret;
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#if USE_POLL
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struct pollfd fd;
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#else
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fd_set rfds, wfds;
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#endif
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/* If the thing I should be doing is already being done, wait for it. */
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if(count ? c->out.writing : c->in.reading)
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{
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pthread_cond_wait(cond, &c->iolock);
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return 1;
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}
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#if USE_POLL
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memset(&fd, 0, sizeof(fd));
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fd.fd = c->fd;
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fd.events = POLLIN;
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#else
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FD_ZERO(&rfds);
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FD_SET(c->fd, &rfds);
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#endif
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++c->in.reading;
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#if USE_POLL
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if(count)
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{
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fd.events |= POLLOUT;
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++c->out.writing;
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}
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#else
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FD_ZERO(&wfds);
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if(count)
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{
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FD_SET(c->fd, &wfds);
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++c->out.writing;
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}
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#endif
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pthread_mutex_unlock(&c->iolock);
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do {
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#if USE_POLL
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ret = poll(&fd, 1, -1);
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/* If poll() returns an event we didn't expect, such as POLLNVAL, treat
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* it as if it failed. */
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if(ret >= 0 && (fd.revents & ~fd.events))
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{
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ret = -1;
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break;
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}
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#else
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ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
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#endif
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} while (ret == -1 && errno == EINTR);
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if(ret < 0)
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{
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_xcb_conn_shutdown(c, XCB_CONN_ERROR);
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ret = 0;
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}
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pthread_mutex_lock(&c->iolock);
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if(ret)
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{
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/* The code allows two threads to call select()/poll() at the same time.
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* First thread just wants to read, a second thread wants to write, too.
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* We have to make sure that we don't steal the reading thread's reply
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* and let it get stuck in select()/poll().
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* So a thread may read if either:
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* - There is no other thread that wants to read (the above situation
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* did not occur).
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* - It is the reading thread (above situation occurred).
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*/
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int may_read = c->in.reading == 1 || !count;
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#if USE_POLL
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if(may_read && (fd.revents & POLLIN) == POLLIN)
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#else
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if(may_read && FD_ISSET(c->fd, &rfds))
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#endif
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ret = ret && _xcb_in_read(c);
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#if USE_POLL
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if((fd.revents & POLLOUT) == POLLOUT)
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#else
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if(FD_ISSET(c->fd, &wfds))
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#endif
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ret = ret && write_vec(c, vector, count);
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}
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if(count)
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--c->out.writing;
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--c->in.reading;
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return ret;
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}
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