system.h

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/* Simple Plugin API
 *
 * Copyright © 2019 Wim Taymans
 *
 * 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 (including the next
 * paragraph) 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 OR COPYRIGHT HOLDERS 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.
 */
 
#ifndef SPA_SYSTEM_H
#define SPA_SYSTEM_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct itimerspec;
 
#include <time.h>
#include <sys/types.h>
 
#include <spa/utils/defs.h>
#include <spa/utils/hook.h>
 
#define SPA_TYPE_INTERFACE_System       SPA_TYPE_INFO_INTERFACE_BASE "System"
#define SPA_TYPE_INTERFACE_DataSystem   SPA_TYPE_INFO_INTERFACE_BASE "DataSystem"
 
#define SPA_VERSION_SYSTEM              0
struct spa_system { struct spa_interface iface; };
 
/* IO events */
#define SPA_IO_IN       (1 << 0)
#define SPA_IO_OUT      (1 << 2)
#define SPA_IO_ERR      (1 << 3)
#define SPA_IO_HUP      (1 << 4)
 
/* flags */
#define SPA_FD_CLOEXEC                  (1<<0)
#define SPA_FD_NONBLOCK                 (1<<1)
#define SPA_FD_EVENT_SEMAPHORE          (1<<2)
#define SPA_FD_TIMER_ABSTIME            (1<<3)
#define SPA_FD_TIMER_CANCEL_ON_SET      (1<<4)
 
struct spa_poll_event {
        uint32_t events;
        void *data;
};
 
struct spa_system_methods {
#define SPA_VERSION_SYSTEM_METHODS      0
        uint32_t version;
 
        /* read/write/ioctl */
        ssize_t (*read) (void *object, int fd, void *buf, size_t count);
        ssize_t (*write) (void *object, int fd, const void *buf, size_t count);
        int (*ioctl) (void *object, int fd, unsigned long request, ...);
        int (*close) (void *object, int fd);
 
        /* clock */
        int (*clock_gettime) (void *object,
                        int clockid, struct timespec *value);
        int (*clock_getres) (void *object,
                        int clockid, struct timespec *res);
 
        /* poll */
        int (*pollfd_create) (void *object, int flags);
        int (*pollfd_add) (void *object, int pfd, int fd, uint32_t events, void *data);
        int (*pollfd_mod) (void *object, int pfd, int fd, uint32_t events, void *data);
        int (*pollfd_del) (void *object, int pfd, int fd);
        int (*pollfd_wait) (void *object, int pfd,
                        struct spa_poll_event *ev, int n_ev, int timeout);
 
        /* timers */
        int (*timerfd_create) (void *object, int clockid, int flags);
        int (*timerfd_settime) (void *object,
                        int fd, int flags,
                        const struct itimerspec *new_value,
                        struct itimerspec *old_value);
        int (*timerfd_gettime) (void *object,
                        int fd, struct itimerspec *curr_value);
        int (*timerfd_read) (void *object, int fd, uint64_t *expirations);
 
        /* events */
        int (*eventfd_create) (void *object, int flags);
        int (*eventfd_write) (void *object, int fd, uint64_t count);
        int (*eventfd_read) (void *object, int fd, uint64_t *count);
 
        /* signals */
        int (*signalfd_create) (void *object, int signal, int flags);
        int (*signalfd_read) (void *object, int fd, int *signal);
};
 
#define spa_system_method_r(o,method,version,...)                       \
({                                                                      \
        volatile int _res = -ENOTSUP;                                   \
        struct spa_system *_o = o;                                      \
        spa_interface_call_res(&_o->iface,                              \
                        struct spa_system_methods, _res,                \
                        method, version, ##__VA_ARGS__);                \
        _res;                                                           \
})
 
 
#define spa_system_read(s,...)                  spa_system_method_r(s,read,0,__VA_ARGS__)
#define spa_system_write(s,...)                 spa_system_method_r(s,write,0,__VA_ARGS__)
#define spa_system_ioctl(s,...)                 spa_system_method_r(s,ioctl,0,__VA_ARGS__)
#define spa_system_close(s,...)                 spa_system_method_r(s,close,0,__VA_ARGS__)
 
#define spa_system_clock_gettime(s,...)         spa_system_method_r(s,clock_gettime,0,__VA_ARGS__)
#define spa_system_clock_getres(s,...)          spa_system_method_r(s,clock_getres,0,__VA_ARGS__)
 
#define spa_system_pollfd_create(s,...)         spa_system_method_r(s,pollfd_create,0,__VA_ARGS__)
#define spa_system_pollfd_add(s,...)            spa_system_method_r(s,pollfd_add,0,__VA_ARGS__)
#define spa_system_pollfd_mod(s,...)            spa_system_method_r(s,pollfd_mod,0,__VA_ARGS__)
#define spa_system_pollfd_del(s,...)            spa_system_method_r(s,pollfd_del,0,__VA_ARGS__)
#define spa_system_pollfd_wait(s,...)           spa_system_method_r(s,pollfd_wait,0,__VA_ARGS__)
 
#define spa_system_timerfd_create(s,...)        spa_system_method_r(s,timerfd_create,0,__VA_ARGS__)
#define spa_system_timerfd_settime(s,...)       spa_system_method_r(s,timerfd_settime,0,__VA_ARGS__)
#define spa_system_timerfd_gettime(s,...)       spa_system_method_r(s,timerfd_gettime,0,__VA_ARGS__)
#define spa_system_timerfd_read(s,...)          spa_system_method_r(s,timerfd_read,0,__VA_ARGS__)
 
#define spa_system_eventfd_create(s,...)        spa_system_method_r(s,eventfd_create,0,__VA_ARGS__)
#define spa_system_eventfd_write(s,...)         spa_system_method_r(s,eventfd_write,0,__VA_ARGS__)
#define spa_system_eventfd_read(s,...)          spa_system_method_r(s,eventfd_read,0,__VA_ARGS__)
 
#define spa_system_signalfd_create(s,...)       spa_system_method_r(s,signalfd_create,0,__VA_ARGS__)
#define spa_system_signalfd_read(s,...)         spa_system_method_r(s,signalfd_read,0,__VA_ARGS__)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_SYSTEM_H */