/* Connection management: the core of XCB. */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
-#include <netinet/in.h>
-#include <sys/select.h>
#include <fcntl.h>
#include <errno.h>
+#include <limits.h>
#include "xcb.h"
#include "xcbint.h"
+#if USE_POLL
+#include <poll.h>
+#elif !defined _WIN32
+#include <sys/select.h>
+#endif
+
+#ifdef _WIN32
+#include "xcb_windefs.h"
+#else
+#include <sys/socket.h>
+#include <netinet/in.h>
+#endif /* _WIN32 */
+
+/* SHUT_RDWR is fairly recent and is not available on all platforms */
+#if !defined(SHUT_RDWR)
+#define SHUT_RDWR 2
+#endif
typedef struct {
- CARD8 status;
- CARD8 pad0[5];
- CARD16 length;
-} XCBSetupGeneric;
+ uint8_t status;
+ uint8_t pad0[5];
+ uint16_t length;
+} xcb_setup_generic_t;
+
+static const int xcb_con_error = XCB_CONN_ERROR;
+static const int xcb_con_closed_mem_er = XCB_CONN_CLOSED_MEM_INSUFFICIENT;
+static const int xcb_con_closed_parse_er = XCB_CONN_CLOSED_PARSE_ERR;
+static const int xcb_con_closed_screen_er = XCB_CONN_CLOSED_INVALID_SCREEN;
static int set_fd_flags(const int fd)
{
- long flags = fcntl(fd, F_GETFL, 0);
+/* Win32 doesn't have file descriptors and the fcntl function. This block sets the socket in non-blocking mode */
+
+#ifdef _WIN32
+ u_long iMode = 1; /* non-zero puts it in non-blocking mode, 0 in blocking mode */
+ int ret = 0;
+
+ ret = ioctlsocket(fd, FIONBIO, &iMode);
+ if(ret != 0)
+ return 0;
+ return 1;
+#else
+ int flags = fcntl(fd, F_GETFL, 0);
if(flags == -1)
return 0;
flags |= O_NONBLOCK;
if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
return 0;
return 1;
+#endif /* _WIN32 */
}
-static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info)
+static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
{
static const char pad[3];
- XCBSetupReq out;
+ xcb_setup_request_t out;
struct iovec parts[6];
int count = 0;
- int endian = 0x01020304;
+ static const uint32_t endian = 0x01020304;
int ret;
memset(&out, 0, sizeof(out));
out.protocol_minor_version = X_PROTOCOL_REVISION;
out.authorization_protocol_name_len = 0;
out.authorization_protocol_data_len = 0;
- parts[count].iov_len = sizeof(XCBSetupReq);
+ parts[count].iov_len = sizeof(xcb_setup_request_t);
parts[count++].iov_base = &out;
- parts[count].iov_len = XCB_PAD(sizeof(XCBSetupReq));
+ parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
parts[count++].iov_base = (char *) pad;
if(auth_info)
parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
parts[count++].iov_base = (char *) pad;
}
- assert(count <= sizeof(parts) / sizeof(*parts));
+ assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
pthread_mutex_lock(&c->iolock);
- {
- struct iovec *parts_ptr = parts;
- ret = _xcb_out_send(c, &parts_ptr, &count);
- }
+ ret = _xcb_out_send(c, parts, count);
pthread_mutex_unlock(&c->iolock);
return ret;
}
-static int read_setup(XCBConnection *c)
+static int read_setup(xcb_connection_t *c)
{
/* Read the server response */
- c->setup = malloc(sizeof(XCBSetupGeneric));
+ c->setup = malloc(sizeof(xcb_setup_generic_t));
if(!c->setup)
return 0;
- if(_xcb_in_read_block(c, c->setup, sizeof(XCBSetupGeneric)) != sizeof(XCBSetupGeneric))
+ if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
return 0;
{
- void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(XCBSetupGeneric));
+ void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
if(!tmp)
return 0;
c->setup = tmp;
}
- if(_xcb_in_read_block(c, (char *) c->setup + sizeof(XCBSetupGeneric), c->setup->length * 4) <= 0)
+ if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
return 0;
/* 0 = failed, 2 = authenticate, 1 = success */
{
case 0: /* failed */
{
- XCBSetupFailed *setup = (XCBSetupFailed *) c->setup;
- write(STDERR_FILENO, XCBSetupFailedReason(setup), XCBSetupFailedReasonLength(setup));
+ xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
+ write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
return 0;
}
case 2: /* authenticate */
{
- XCBSetupAuthenticate *setup = (XCBSetupAuthenticate *) c->setup;
- write(STDERR_FILENO, XCBSetupAuthenticateReason(setup), XCBSetupAuthenticateReasonLength(setup));
+ xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
+ write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
return 0;
}
}
}
/* precondition: there must be something for us to write. */
-static int write_vec(XCBConnection *c, struct iovec **vector, int *count)
+static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
{
int n;
assert(!c->out.queue_len);
- n = writev(c->fd, *vector, *count);
- if(n < 0 && errno == EAGAIN)
- return 1;
+
+#ifdef _WIN32
+ int i = 0;
+ int ret = 0,err = 0;
+ struct iovec *vec;
+ n = 0;
+
+ /* Could use the WSASend win32 function for scatter/gather i/o but setting up the WSABUF struct from
+ an iovec would require more work and I'm not sure of the benefit....works for now */
+ vec = *vector;
+ while(i < *count)
+ {
+ ret = send(c->fd,vec->iov_base,vec->iov_len,0);
+ if(ret == SOCKET_ERROR)
+ {
+ err = WSAGetLastError();
+ if(err == WSAEWOULDBLOCK)
+ {
+ return 1;
+ }
+ }
+ n += ret;
+ *vec++;
+ i++;
+ }
+#else
+ n = *count;
+ if (n > IOV_MAX)
+ n = IOV_MAX;
+
+#if HAVE_SENDMSG
+ if (c->out.out_fd.nfd) {
+ char cmsgbuf[CMSG_SPACE(sizeof(int) * XCB_MAX_PASS_FD)];
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = *vector,
+ .msg_iovlen = n,
+ .msg_control = cmsgbuf,
+ .msg_controllen = CMSG_LEN(c->out.out_fd.nfd * sizeof (int)),
+ };
+ int i;
+ struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg);
+
+ hdr->cmsg_len = msg.msg_controllen;
+ hdr->cmsg_level = SOL_SOCKET;
+ hdr->cmsg_type = SCM_RIGHTS;
+ memcpy(CMSG_DATA(hdr), c->out.out_fd.fd, c->out.out_fd.nfd * sizeof (int));
+
+ n = sendmsg(c->fd, &msg, 0);
+ if(n < 0 && errno == EAGAIN)
+ return 1;
+ for (i = 0; i < c->out.out_fd.nfd; i++)
+ close(c->out.out_fd.fd[i]);
+ c->out.out_fd.nfd = 0;
+ } else
+#endif
+ {
+ n = writev(c->fd, *vector, n);
+ if(n < 0 && errno == EAGAIN)
+ return 1;
+ }
+
+#endif /* _WIN32 */
+
if(n <= 0)
+ {
+ _xcb_conn_shutdown(c, XCB_CONN_ERROR);
return 0;
+ }
for(; *count; --*count, ++*vector)
{
/* Public interface */
-const XCBSetup *XCBGetSetup(XCBConnection *c)
+const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
{
+ if(c->has_error)
+ return 0;
/* doesn't need locking because it's never written to. */
return c->setup;
}
-int XCBGetFileDescriptor(XCBConnection *c)
+int xcb_get_file_descriptor(xcb_connection_t *c)
{
+ if(c->has_error)
+ return -1;
/* doesn't need locking because it's never written to. */
return c->fd;
}
-int XCBConnectionHasError(XCBConnection *c)
+int xcb_connection_has_error(xcb_connection_t *c)
{
/* doesn't need locking because it's read and written atomically. */
return c->has_error;
}
-XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
+xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
{
- XCBConnection* c;
+ xcb_connection_t* c;
- c = calloc(1, sizeof(XCBConnection));
- if(!c)
- return 0;
+#ifndef _WIN32
+#ifndef USE_POLL
+ if(fd >= FD_SETSIZE) /* would overflow in FD_SET */
+ {
+ close(fd);
+ return _xcb_conn_ret_error(XCB_CONN_ERROR);
+ }
+#endif
+#endif /* !_WIN32*/
+
+ c = calloc(1, sizeof(xcb_connection_t));
+ if(!c) {
+ close(fd);
+ return _xcb_conn_ret_error(XCB_CONN_CLOSED_MEM_INSUFFICIENT) ;
+ }
c->fd = fd;
_xcb_xid_init(c)
))
{
- XCBDisconnect(c);
- return 0;
+ xcb_disconnect(c);
+ return _xcb_conn_ret_error(XCB_CONN_ERROR);
}
return c;
}
-void XCBDisconnect(XCBConnection *c)
+void xcb_disconnect(xcb_connection_t *c)
{
- if(!c)
+ if(c->has_error)
return;
free(c->setup);
+
+ /* disallow further sends and receives */
+ shutdown(c->fd, SHUT_RDWR);
close(c->fd);
pthread_mutex_destroy(&c->iolock);
_xcb_xid_destroy(c);
free(c);
+
+#ifdef _WIN32
+ WSACleanup();
+#endif
}
/* Private interface */
-int _xcb_conn_wait(XCBConnection *c, pthread_cond_t *cond, struct iovec **vector, int *count)
+void _xcb_conn_shutdown(xcb_connection_t *c, int err)
+{
+ c->has_error = err;
+}
+
+/* Return connection error state.
+ * To make thread-safe, I need a seperate static
+ * variable for every possible error.
+ */
+xcb_connection_t *_xcb_conn_ret_error(int err)
+{
+
+ switch(err)
+ {
+ case XCB_CONN_CLOSED_MEM_INSUFFICIENT:
+ {
+ return (xcb_connection_t *) &xcb_con_closed_mem_er;
+ }
+ case XCB_CONN_CLOSED_PARSE_ERR:
+ {
+ return (xcb_connection_t *) &xcb_con_closed_parse_er;
+ }
+ case XCB_CONN_CLOSED_INVALID_SCREEN:
+ {
+ return (xcb_connection_t *) &xcb_con_closed_screen_er;
+ }
+ case XCB_CONN_ERROR:
+ default:
+ {
+ return (xcb_connection_t *) &xcb_con_error;
+ }
+ }
+}
+
+int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
{
int ret;
+#if USE_POLL
+ struct pollfd fd;
+#else
fd_set rfds, wfds;
+#endif
/* If the thing I should be doing is already being done, wait for it. */
if(count ? c->out.writing : c->in.reading)
return 1;
}
+#if USE_POLL
+ memset(&fd, 0, sizeof(fd));
+ fd.fd = c->fd;
+ fd.events = POLLIN;
+#else
FD_ZERO(&rfds);
FD_SET(c->fd, &rfds);
+#endif
++c->in.reading;
+#if USE_POLL
+ if(count)
+ {
+ fd.events |= POLLOUT;
+ ++c->out.writing;
+ }
+#else
FD_ZERO(&wfds);
if(count)
{
FD_SET(c->fd, &wfds);
++c->out.writing;
}
+#endif
pthread_mutex_unlock(&c->iolock);
do {
- ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
+#if USE_POLL
+ ret = poll(&fd, 1, -1);
+ /* If poll() returns an event we didn't expect, such as POLLNVAL, treat
+ * it as if it failed. */
+ if(ret >= 0 && (fd.revents & ~fd.events))
+ {
+ ret = -1;
+ break;
+ }
+#else
+ ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
+#endif
} while (ret == -1 && errno == EINTR);
- if (ret < 0)
- ret = 0;
+ if(ret < 0)
+ {
+ _xcb_conn_shutdown(c, XCB_CONN_ERROR);
+ ret = 0;
+ }
pthread_mutex_lock(&c->iolock);
if(ret)
{
- if(FD_ISSET(c->fd, &rfds))
+ /* The code allows two threads to call select()/poll() at the same time.
+ * First thread just wants to read, a second thread wants to write, too.
+ * We have to make sure that we don't steal the reading thread's reply
+ * and let it get stuck in select()/poll().
+ * So a thread may read if either:
+ * - There is no other thread that wants to read (the above situation
+ * did not occur).
+ * - It is the reading thread (above situation occurred).
+ */
+ int may_read = c->in.reading == 1 || !count;
+#if USE_POLL
+ if(may_read && (fd.revents & POLLIN) != 0)
+#else
+ if(may_read && FD_ISSET(c->fd, &rfds))
+#endif
ret = ret && _xcb_in_read(c);
+#if USE_POLL
+ if((fd.revents & POLLOUT) != 0)
+#else
if(FD_ISSET(c->fd, &wfds))
+#endif
ret = ret && write_vec(c, vector, count);
}
projects / free-sw / xcb / libxcb / blobdiff