689 lines
17 KiB
C
689 lines
17 KiB
C
/* http://frotznet.googlecode.com/svn/trunk/utils/fdevent.c
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**
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** Copyright 2006, Brian Swetland <swetland@frotz.net>
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include "adb_trace.h"
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#include "fdevent.h"
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#include "transport.h"
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#include "sysdeps.h"
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#define TRACE_TAG TRACE_FDEVENT
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/* !!! Do not enable DEBUG for the adb that will run as the server:
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** both stdout and stderr are used to communicate between the client
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** and server. Any extra output will cause failures.
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*/
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#define DEBUG 0 /* non-0 will break adb server */
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// This socket is used when a subproc shell service exists.
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// It wakes up the fdevent_loop() and cause the correct handling
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// of the shell's pseudo-tty master. I.e. force close it.
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int SHELL_EXIT_NOTIFY_FD = -1;
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static void fatal(const char *fn, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "%s:", fn);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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abort();
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}
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#define FATAL(x...) fatal(__FUNCTION__, x)
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#if DEBUG
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static void dump_fde(fdevent *fde, const char *info)
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{
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adb_mutex_lock(&D_lock);
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fprintf(stderr,"FDE #%03d %c%c%c %s\n", fde->fd,
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fde->state & FDE_READ ? 'R' : ' ',
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fde->state & FDE_WRITE ? 'W' : ' ',
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fde->state & FDE_ERROR ? 'E' : ' ',
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info);
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adb_mutex_unlock(&D_lock);
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}
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#else
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#define dump_fde(fde, info) do { } while(0)
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#endif
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#define FDE_EVENTMASK 0x00ff
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#define FDE_STATEMASK 0xff00
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#define FDE_ACTIVE 0x0100
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#define FDE_PENDING 0x0200
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#define FDE_CREATED 0x0400
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static void fdevent_plist_enqueue(fdevent *node);
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static void fdevent_plist_remove(fdevent *node);
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static fdevent *fdevent_plist_dequeue(void);
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static void fdevent_subproc_event_func(int fd, unsigned events, void *userdata);
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static fdevent list_pending = {
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.next = &list_pending,
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.prev = &list_pending,
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};
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static fdevent **fd_table = 0;
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static int fd_table_max = 0;
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#ifdef CRAPTASTIC
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//HAVE_EPOLL
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#include <sys/epoll.h>
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static int epoll_fd = -1;
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static void fdevent_init()
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{
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/* XXX: what's a good size for the passed in hint? */
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epoll_fd = epoll_create(256);
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if(epoll_fd < 0) {
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perror("epoll_create() failed");
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exit(1);
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}
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/* mark for close-on-exec */
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fcntl(epoll_fd, F_SETFD, FD_CLOEXEC);
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}
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static void fdevent_connect(fdevent *fde)
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{
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struct epoll_event ev;
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memset(&ev, 0, sizeof(ev));
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ev.events = 0;
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ev.data.ptr = fde;
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#if 0
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if(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fde->fd, &ev)) {
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perror("epoll_ctl() failed\n");
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exit(1);
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}
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#endif
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}
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static void fdevent_disconnect(fdevent *fde)
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{
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struct epoll_event ev;
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memset(&ev, 0, sizeof(ev));
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ev.events = 0;
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ev.data.ptr = fde;
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/* technically we only need to delete if we
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** were actively monitoring events, but let's
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** be aggressive and do it anyway, just in case
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** something's out of sync
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*/
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epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fde->fd, &ev);
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}
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static void fdevent_update(fdevent *fde, unsigned events)
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{
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struct epoll_event ev;
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int active;
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active = (fde->state & FDE_EVENTMASK) != 0;
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memset(&ev, 0, sizeof(ev));
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ev.events = 0;
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ev.data.ptr = fde;
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if(events & FDE_READ) ev.events |= EPOLLIN;
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if(events & FDE_WRITE) ev.events |= EPOLLOUT;
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if(events & FDE_ERROR) ev.events |= (EPOLLERR | EPOLLHUP);
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fde->state = (fde->state & FDE_STATEMASK) | events;
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if(active) {
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/* we're already active. if we're changing to *no*
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** events being monitored, we need to delete, otherwise
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** we need to just modify
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*/
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if(ev.events) {
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if(epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fde->fd, &ev)) {
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perror("epoll_ctl() failed\n");
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exit(1);
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}
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} else {
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if(epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fde->fd, &ev)) {
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perror("epoll_ctl() failed\n");
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exit(1);
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}
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}
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} else {
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/* we're not active. if we're watching events, we need
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** to add, otherwise we can just do nothing
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*/
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if(ev.events) {
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if(epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fde->fd, &ev)) {
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perror("epoll_ctl() failed\n");
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exit(1);
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}
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}
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}
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}
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static void fdevent_process()
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{
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struct epoll_event events[256];
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fdevent *fde;
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int i, n;
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n = epoll_wait(epoll_fd, events, 256, -1);
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if(n < 0) {
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if(errno == EINTR) return;
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perror("epoll_wait");
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exit(1);
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}
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for(i = 0; i < n; i++) {
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struct epoll_event *ev = events + i;
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fde = ev->data.ptr;
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if(ev->events & EPOLLIN) {
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fde->events |= FDE_READ;
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}
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if(ev->events & EPOLLOUT) {
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fde->events |= FDE_WRITE;
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}
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if(ev->events & (EPOLLERR | EPOLLHUP)) {
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fde->events |= FDE_ERROR;
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}
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if(fde->events) {
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if(fde->state & FDE_PENDING) continue;
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fde->state |= FDE_PENDING;
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fdevent_plist_enqueue(fde);
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}
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}
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}
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#else /* USE_SELECT */
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#ifdef HAVE_WINSOCK
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#include <winsock2.h>
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#else
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#include <sys/select.h>
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#endif
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static fd_set read_fds;
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static fd_set write_fds;
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static fd_set error_fds;
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static int select_n = 0;
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static void fdevent_init(void)
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{
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FD_ZERO(&read_fds);
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FD_ZERO(&write_fds);
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FD_ZERO(&error_fds);
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}
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static void fdevent_connect(fdevent *fde)
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{
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if(fde->fd >= select_n) {
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select_n = fde->fd + 1;
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}
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}
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static void fdevent_disconnect(fdevent *fde)
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{
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int i, n;
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FD_CLR(fde->fd, &read_fds);
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FD_CLR(fde->fd, &write_fds);
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FD_CLR(fde->fd, &error_fds);
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for(n = 0, i = 0; i < select_n; i++) {
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if(fd_table[i] != 0) n = i;
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}
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select_n = n + 1;
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}
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static void fdevent_update(fdevent *fde, unsigned events)
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{
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if(events & FDE_READ) {
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FD_SET(fde->fd, &read_fds);
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} else {
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FD_CLR(fde->fd, &read_fds);
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}
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if(events & FDE_WRITE) {
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FD_SET(fde->fd, &write_fds);
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} else {
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FD_CLR(fde->fd, &write_fds);
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}
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if(events & FDE_ERROR) {
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FD_SET(fde->fd, &error_fds);
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} else {
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FD_CLR(fde->fd, &error_fds);
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}
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fde->state = (fde->state & FDE_STATEMASK) | events;
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}
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/* Looks at fd_table[] for bad FDs and sets bit in fds.
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** Returns the number of bad FDs.
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*/
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static int fdevent_fd_check(fd_set *fds)
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{
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int i, n = 0;
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fdevent *fde;
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for(i = 0; i < select_n; i++) {
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fde = fd_table[i];
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if(fde == 0) continue;
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if(fcntl(i, F_GETFL, NULL) < 0) {
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FD_SET(i, fds);
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n++;
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// fde->state |= FDE_DONT_CLOSE;
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}
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}
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return n;
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}
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#if !DEBUG
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static inline void dump_all_fds(const char *extra_msg) {}
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#else
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static void dump_all_fds(const char *extra_msg)
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{
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int i;
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fdevent *fde;
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// per fd: 4 digits (but really: log10(FD_SETSIZE)), 1 staus, 1 blank
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char msg_buff[FD_SETSIZE*6 + 1], *pb=msg_buff;
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size_t max_chars = FD_SETSIZE * 6 + 1;
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int printed_out;
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#define SAFE_SPRINTF(...) \
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do { \
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printed_out = snprintf(pb, max_chars, __VA_ARGS__); \
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if (printed_out <= 0) { \
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D("... snprintf failed.\n"); \
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return; \
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} \
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if (max_chars < (unsigned int)printed_out) { \
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D("... snprintf out of space.\n"); \
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return; \
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} \
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pb += printed_out; \
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max_chars -= printed_out; \
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} while(0)
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for(i = 0; i < select_n; i++) {
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fde = fd_table[i];
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SAFE_SPRINTF("%d", i);
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if(fde == 0) {
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SAFE_SPRINTF("? ");
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continue;
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}
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if(fcntl(i, F_GETFL, NULL) < 0) {
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SAFE_SPRINTF("b");
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}
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SAFE_SPRINTF(" ");
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}
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D("%s fd_table[]->fd = {%s}\n", extra_msg, msg_buff);
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}
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#endif
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static void fdevent_process()
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{
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int i, n;
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fdevent *fde;
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unsigned events;
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fd_set rfd, wfd, efd;
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memcpy(&rfd, &read_fds, sizeof(fd_set));
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memcpy(&wfd, &write_fds, sizeof(fd_set));
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memcpy(&efd, &error_fds, sizeof(fd_set));
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dump_all_fds("pre select()");
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n = select(select_n, &rfd, &wfd, &efd, NULL);
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int saved_errno = errno;
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D("select() returned n=%d, errno=%d\n", n, n<0?saved_errno:0);
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dump_all_fds("post select()");
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if(n < 0) {
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switch(saved_errno) {
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case EINTR: return;
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case EBADF:
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// Can't trust the FD sets after an error.
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FD_ZERO(&wfd);
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FD_ZERO(&efd);
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FD_ZERO(&rfd);
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break;
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default:
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D("Unexpected select() error=%d\n", saved_errno);
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return;
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}
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}
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if(n <= 0) {
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// We fake a read, as the rest of the code assumes
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// that errors will be detected at that point.
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n = fdevent_fd_check(&rfd);
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}
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for(i = 0; (i < select_n) && (n > 0); i++) {
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events = 0;
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if(FD_ISSET(i, &rfd)) { events |= FDE_READ; n--; }
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if(FD_ISSET(i, &wfd)) { events |= FDE_WRITE; n--; }
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if(FD_ISSET(i, &efd)) { events |= FDE_ERROR; n--; }
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if(events) {
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fde = fd_table[i];
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if(fde == 0)
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FATAL("missing fde for fd %d\n", i);
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fde->events |= events;
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D("got events fde->fd=%d events=%04x, state=%04x\n",
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fde->fd, fde->events, fde->state);
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if(fde->state & FDE_PENDING) continue;
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fde->state |= FDE_PENDING;
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fdevent_plist_enqueue(fde);
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}
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}
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}
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#endif
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static void fdevent_register(fdevent *fde)
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{
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if(fde->fd < 0) {
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FATAL("bogus negative fd (%d)\n", fde->fd);
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}
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if(fde->fd >= fd_table_max) {
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int oldmax = fd_table_max;
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if(fde->fd > 32000) {
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FATAL("bogus huuuuge fd (%d)\n", fde->fd);
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}
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if(fd_table_max == 0) {
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fdevent_init();
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fd_table_max = 256;
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}
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while(fd_table_max <= fde->fd) {
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fd_table_max *= 2;
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}
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fd_table = realloc(fd_table, sizeof(fdevent*) * fd_table_max);
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if(fd_table == 0) {
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FATAL("could not expand fd_table to %d entries\n", fd_table_max);
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}
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memset(fd_table + oldmax, 0, sizeof(int) * (fd_table_max - oldmax));
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}
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fd_table[fde->fd] = fde;
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}
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static void fdevent_unregister(fdevent *fde)
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{
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if((fde->fd < 0) || (fde->fd >= fd_table_max)) {
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FATAL("fd out of range (%d)\n", fde->fd);
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}
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if(fd_table[fde->fd] != fde) {
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FATAL("fd_table out of sync [%d]\n", fde->fd);
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}
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fd_table[fde->fd] = 0;
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if(!(fde->state & FDE_DONT_CLOSE)) {
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dump_fde(fde, "close");
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adb_close(fde->fd);
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}
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}
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static void fdevent_plist_enqueue(fdevent *node)
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{
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fdevent *list = &list_pending;
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node->next = list;
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node->prev = list->prev;
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node->prev->next = node;
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list->prev = node;
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}
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static void fdevent_plist_remove(fdevent *node)
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{
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node->prev->next = node->next;
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node->next->prev = node->prev;
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node->next = 0;
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node->prev = 0;
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}
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static fdevent *fdevent_plist_dequeue(void)
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{
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fdevent *list = &list_pending;
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fdevent *node = list->next;
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if(node == list) return 0;
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list->next = node->next;
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list->next->prev = list;
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node->next = 0;
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node->prev = 0;
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return node;
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}
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static void fdevent_call_fdfunc(fdevent* fde)
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{
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unsigned events = fde->events;
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fde->events = 0;
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if(!(fde->state & FDE_PENDING)) return;
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fde->state &= (~FDE_PENDING);
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dump_fde(fde, "callback");
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fde->func(fde->fd, events, fde->arg);
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}
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static void fdevent_subproc_event_func(int fd, unsigned ev, void *userdata)
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{
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D("subproc handling on fd=%d ev=%04x\n", fd, ev);
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// Hook oneself back into the fde's suitable for select() on read.
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if((fd < 0) || (fd >= fd_table_max)) {
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FATAL("fd %d out of range for fd_table \n", fd);
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}
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fdevent *fde = fd_table[fd];
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fdevent_add(fde, FDE_READ);
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if(ev & FDE_READ){
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int subproc_fd;
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if(readx(fd, &subproc_fd, sizeof(subproc_fd))) {
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FATAL("Failed to read the subproc's fd from fd=%d\n", fd);
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}
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if((subproc_fd < 0) || (subproc_fd >= fd_table_max)) {
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D("subproc_fd %d out of range 0, fd_table_max=%d\n",
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subproc_fd, fd_table_max);
|
|
return;
|
|
}
|
|
fdevent *subproc_fde = fd_table[subproc_fd];
|
|
if(!subproc_fde) {
|
|
D("subproc_fd %d cleared from fd_table\n", subproc_fd);
|
|
return;
|
|
}
|
|
if(subproc_fde->fd != subproc_fd) {
|
|
// Already reallocated?
|
|
D("subproc_fd %d != fd_table[].fd %d\n", subproc_fd, subproc_fde->fd);
|
|
return;
|
|
}
|
|
|
|
subproc_fde->force_eof = 1;
|
|
|
|
int rcount = 0;
|
|
ioctl(subproc_fd, FIONREAD, &rcount);
|
|
D("subproc with fd=%d has rcount=%d err=%d\n",
|
|
subproc_fd, rcount, errno);
|
|
|
|
if(rcount) {
|
|
// If there is data left, it will show up in the select().
|
|
// This works because there is no other thread reading that
|
|
// data when in this fd_func().
|
|
return;
|
|
}
|
|
|
|
D("subproc_fde.state=%04x\n", subproc_fde->state);
|
|
subproc_fde->events |= FDE_READ;
|
|
if(subproc_fde->state & FDE_PENDING) {
|
|
return;
|
|
}
|
|
subproc_fde->state |= FDE_PENDING;
|
|
fdevent_call_fdfunc(subproc_fde);
|
|
}
|
|
}
|
|
|
|
fdevent *fdevent_create(int fd, fd_func func, void *arg)
|
|
{
|
|
fdevent *fde = (fdevent*) malloc(sizeof(fdevent));
|
|
if(fde == 0) return 0;
|
|
fdevent_install(fde, fd, func, arg);
|
|
fde->state |= FDE_CREATED;
|
|
return fde;
|
|
}
|
|
|
|
void fdevent_destroy(fdevent *fde)
|
|
{
|
|
if(fde == 0) return;
|
|
if(!(fde->state & FDE_CREATED)) {
|
|
FATAL("fde %p not created by fdevent_create()\n", fde);
|
|
}
|
|
fdevent_remove(fde);
|
|
}
|
|
|
|
void fdevent_install(fdevent *fde, int fd, fd_func func, void *arg)
|
|
{
|
|
memset(fde, 0, sizeof(fdevent));
|
|
fde->state = FDE_ACTIVE;
|
|
fde->fd = fd;
|
|
fde->force_eof = 0;
|
|
fde->func = func;
|
|
fde->arg = arg;
|
|
|
|
#ifndef HAVE_WINSOCK
|
|
fcntl(fd, F_SETFL, O_NONBLOCK);
|
|
#endif
|
|
fdevent_register(fde);
|
|
dump_fde(fde, "connect");
|
|
fdevent_connect(fde);
|
|
fde->state |= FDE_ACTIVE;
|
|
}
|
|
|
|
void fdevent_remove(fdevent *fde)
|
|
{
|
|
if(fde->state & FDE_PENDING) {
|
|
fdevent_plist_remove(fde);
|
|
}
|
|
|
|
if(fde->state & FDE_ACTIVE) {
|
|
fdevent_disconnect(fde);
|
|
dump_fde(fde, "disconnect");
|
|
fdevent_unregister(fde);
|
|
}
|
|
|
|
fde->state = 0;
|
|
fde->events = 0;
|
|
}
|
|
|
|
|
|
void fdevent_set(fdevent *fde, unsigned events)
|
|
{
|
|
events &= FDE_EVENTMASK;
|
|
|
|
if((fde->state & FDE_EVENTMASK) == events) return;
|
|
|
|
if(fde->state & FDE_ACTIVE) {
|
|
fdevent_update(fde, events);
|
|
dump_fde(fde, "update");
|
|
}
|
|
|
|
fde->state = (fde->state & FDE_STATEMASK) | events;
|
|
|
|
if(fde->state & FDE_PENDING) {
|
|
/* if we're pending, make sure
|
|
** we don't signal an event that
|
|
** is no longer wanted.
|
|
*/
|
|
fde->events &= (~events);
|
|
if(fde->events == 0) {
|
|
fdevent_plist_remove(fde);
|
|
fde->state &= (~FDE_PENDING);
|
|
}
|
|
}
|
|
}
|
|
|
|
void fdevent_add(fdevent *fde, unsigned events)
|
|
{
|
|
fdevent_set(
|
|
fde, (fde->state & FDE_EVENTMASK) | (events & FDE_EVENTMASK));
|
|
}
|
|
|
|
void fdevent_del(fdevent *fde, unsigned events)
|
|
{
|
|
fdevent_set(
|
|
fde, (fde->state & FDE_EVENTMASK) & (~(events & FDE_EVENTMASK)));
|
|
}
|
|
|
|
void fdevent_subproc_setup()
|
|
{
|
|
int s[2];
|
|
|
|
if(adb_socketpair(s)) {
|
|
FATAL("cannot create shell-exit socket-pair\n");
|
|
}
|
|
D("socketpair: (%d,%d)", s[0], s[1]);
|
|
|
|
SHELL_EXIT_NOTIFY_FD = s[0];
|
|
fdevent *fde;
|
|
fde = fdevent_create(s[1], fdevent_subproc_event_func, NULL);
|
|
if(!fde)
|
|
FATAL("cannot create fdevent for shell-exit handler\n");
|
|
fdevent_add(fde, FDE_READ);
|
|
}
|
|
|
|
void fdevent_loop()
|
|
{
|
|
fdevent *fde;
|
|
fdevent_subproc_setup();
|
|
|
|
for(;;) {
|
|
D("--- ---- waiting for events\n");
|
|
|
|
fdevent_process();
|
|
|
|
while((fde = fdevent_plist_dequeue())) {
|
|
fdevent_call_fdfunc(fde);
|
|
}
|
|
}
|
|
}
|