select.h

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/*
 * SPDX-FileCopyrightText: 2019 Freie Universität Berlin
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#ifdef CPU_NATIVE
/* On native, system headers may depend on system's <sys/select.h>. Hence,
 * include the real sys/select.h here. */
__extension__
#include_next <sys/select.h>
#endif
 
#include <string.h>
/* prevent cyclic dependency with newlib/picolibc's `sys/types.h` */
#if (defined(MODULE_NEWLIB) || defined(MODULE_PICOLIBC)) && !defined(CPU_ESP8266)
#include <sys/_timeval.h>
#else
#include <sys/time.h>
#endif
 
#include "bitfield.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define POSIX_SELECT_THREAD_FLAG    (1U << 3)
 
#ifndef CPU_NATIVE

#ifndef CONFIG_POSIX_FD_SET_SIZE
#define CONFIG_POSIX_FD_SET_SIZE    (16)
#endif
 
/* ESP's newlib has this already defined in `sys/types.h` */
#if !defined(CPU_ESP8266)
#define FD_SETSIZE                  (CONFIG_POSIX_FD_SET_SIZE)

typedef struct {
    BITFIELD(fds, FD_SETSIZE);  
} fd_set;

static inline void FD_CLR(int fd, fd_set *fdsetp)
{
    bf_unset(fdsetp->fds, fd);
}

static inline int FD_ISSET(int fd, fd_set *fdsetp)
{
    return (int)bf_isset(fdsetp->fds, fd);
}

static inline void FD_SET(int fd, fd_set *fdsetp)
{
    bf_set(fdsetp->fds, fd);
}

static inline void FD_ZERO(fd_set *fdsetp)
{
    memset(fdsetp->fds, 0, sizeof(fdsetp->fds));
}
#endif /* !defined(CPU_ESP32) && !defined(CPU_ESP8266) */

int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds,
           struct timeval *timeout);
 
#endif /* CPU_NATIVE */
 
#ifdef __cplusplus
}
#endif