/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the names of the authors or their * institutions shall not be used in advertising or otherwise to promote the * sale, use or other dealings in this Software without prior written * authorization from the authors. */ /* Connection management: the core of XCB. */ #include #include #include #include #include #include #include #include #include "xcb.h" #include "xcbint.h" static int set_fd_flags(const int fd) { long flags = fcntl(fd, F_GETFL, 0); if(flags == -1) return 0; flags |= O_NONBLOCK; if(fcntl(fd, F_SETFL, flags) == -1) return 0; if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) return 0; return 1; } static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info) { static const char pad[3]; XCBConnSetupReq out; struct iovec parts[6]; int count = 0; int endian = 0x01020304; int ret; memset(&out, 0, sizeof(out)); /* B = 0x42 = MSB first, l = 0x6c = LSB first */ if(htonl(endian) == endian) out.byte_order = 0x42; else out.byte_order = 0x6c; out.protocol_major_version = X_PROTOCOL; out.protocol_minor_version = X_PROTOCOL_REVISION; out.authorization_protocol_name_len = 0; out.authorization_protocol_data_len = 0; parts[count].iov_len = sizeof(XCBConnSetupReq); parts[count++].iov_base = &out; parts[count].iov_len = XCB_PAD(sizeof(XCBConnSetupReq)); parts[count++].iov_base = (caddr_t) pad; if(auth_info) { parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen; parts[count++].iov_base = auth_info->name; parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len); parts[count++].iov_base = (caddr_t) pad; parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen; parts[count++].iov_base = auth_info->data; parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len); parts[count++].iov_base = (caddr_t) pad; } assert(count <= sizeof(parts) / sizeof(*parts)); pthread_mutex_lock(&c->iolock); _xcb_out_write_block(c, parts, count); ret = _xcb_out_flush(c); pthread_mutex_unlock(&c->iolock); return ret; } static int read_setup(XCBConnection *c) { /* Read the server response */ c->setup = malloc(sizeof(XCBConnSetupGenericRep)); if(!c->setup) return 0; if(_xcb_in_read_block(c, c->setup, sizeof(XCBConnSetupGenericRep)) != sizeof(XCBConnSetupGenericRep)) return 0; { void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(XCBConnSetupGenericRep)); if(!tmp) return 0; c->setup = tmp; } if(_xcb_in_read_block(c, (char *) c->setup + sizeof(XCBConnSetupGenericRep), c->setup->length * 4) <= 0) return 0; /* 0 = failed, 2 = authenticate, 1 = success */ switch(c->setup->status) { case 0: /* failed */ { XCBConnSetupFailedRep *setup = (XCBConnSetupFailedRep *) c->setup; write(STDERR_FILENO, XCBConnSetupFailedRepReason(setup), XCBConnSetupFailedRepReasonLength(setup)); return 0; } case 2: /* authenticate */ { XCBConnSetupAuthenticateRep *setup = (XCBConnSetupAuthenticateRep *) c->setup; write(STDERR_FILENO, XCBConnSetupAuthenticateRepReason(setup), XCBConnSetupAuthenticateRepReasonLength(setup)); return 0; } } return 1; } /* Public interface */ XCBConnSetupSuccessRep *XCBGetSetup(XCBConnection *c) { /* doesn't need locking because it's never written to. */ return c->setup; } int XCBGetFileDescriptor(XCBConnection *c) { /* doesn't need locking because it's never written to. */ return c->fd; } XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info) { XCBConnection* c; c = calloc(1, sizeof(XCBConnection)); if(!c) return 0; c->fd = fd; if(!( set_fd_flags(fd) && pthread_mutex_init(&c->iolock, 0) == 0 && _xcb_in_init(&c->in) && _xcb_out_init(&c->out) && write_setup(c, auth_info) && read_setup(c) && _xcb_ext_init(c) && _xcb_xid_init(c) )) { XCBDisconnect(c); return 0; } return c; } void XCBDisconnect(XCBConnection *c) { if(!c) return; free(c->setup); close(c->fd); pthread_mutex_destroy(&c->iolock); _xcb_in_destroy(&c->in); _xcb_out_destroy(&c->out); _xcb_ext_destroy(c); _xcb_xid_destroy(c); free(c); } /* Private interface */ int _xcb_conn_wait(XCBConnection *c, const int should_write, pthread_cond_t *cond) { int ret; fd_set rfds, wfds; /* If the thing I should be doing is already being done, wait for it. */ if(should_write ? c->out.writing : c->in.reading) { pthread_cond_wait(cond, &c->iolock); return 1; } FD_ZERO(&rfds); FD_SET(c->fd, &rfds); ++c->in.reading; FD_ZERO(&wfds); if(should_write) { FD_SET(c->fd, &wfds); ++c->out.writing; } pthread_mutex_unlock(&c->iolock); ret = select(c->fd + 1, &rfds, &wfds, 0, 0) > 0; pthread_mutex_lock(&c->iolock); if(ret) { if(FD_ISSET(c->fd, &rfds)) ret = ret && _xcb_in_read(c); if(FD_ISSET(c->fd, &wfds)) ret = ret && _xcb_out_write(c); } if(should_write) --c->out.writing; --c->in.reading; return ret; }