1 /* 2 * libusb event abstraction on POSIX platforms 3 * 4 * Copyright © 2020 Chris Dickens <christopher.a.dickens@gmail.com> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef LIBUSB_EVENTS_POSIX_H 22 #define LIBUSB_EVENTS_POSIX_H 23 24 #include <poll.h> 25 26 typedef int usbi_os_handle_t; 27 #define USBI_OS_HANDLE_FORMAT_STRING "fd %d" 28 29 #ifdef HAVE_EVENTFD 30 typedef struct usbi_event { 31 int eventfd; 32 } usbi_event_t; 33 #define USBI_EVENT_OS_HANDLE(e) ((e)->eventfd) 34 #define USBI_EVENT_POLL_EVENTS POLLIN 35 #define USBI_INVALID_EVENT { -1 } 36 #else 37 typedef struct usbi_event { 38 int pipefd[2]; 39 #ifdef __EMSCRIPTEN__ 40 _Atomic int has_event; 41 #endif 42 } usbi_event_t; 43 #define USBI_EVENT_OS_HANDLE(e) ((e)->pipefd[0]) 44 #define USBI_EVENT_POLL_EVENTS POLLIN 45 #define USBI_INVALID_EVENT { { -1, -1 } } 46 #endif 47 48 #ifdef HAVE_TIMERFD 49 #define HAVE_OS_TIMER 1 50 typedef struct usbi_timer { 51 int timerfd; 52 } usbi_timer_t; 53 #define USBI_TIMER_OS_HANDLE(t) ((t)->timerfd) 54 #define USBI_TIMER_POLL_EVENTS POLLIN 55 usbi_timer_valid(usbi_timer_t * timer)56static inline int usbi_timer_valid(usbi_timer_t *timer) 57 { 58 return timer->timerfd >= 0; 59 } 60 #endif 61 62 #endif 63