esp-idf/components/newlib/platform_include/sys/select.h

/*
 * SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef __ESP_SYS_SELECT_H__
#define __ESP_SYS_SELECT_H__

/* Newlib 2.2.0 does not provide sys/select.h, and fd_set is defined in sys/types.h */
#include <sys/types.h>
#ifndef fd_set
#include_next <sys/select.h>
#else // fd_set
#include <sys/time.h>

#ifdef __cplusplus
extern "C" {
#endif

int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);

#ifdef __cplusplus
} // extern "C"
#endif

#endif // fd_set

#if defined(FD_ISSET) || defined(FD_SET) || defined(FD_CLR)
#undef FD_SET
#undef FD_CLR
#undef FD_ISSET

#define __FD_SAFE_SET(n, code) do { if ((unsigned)(n) < FD_SETSIZE) { code; } } while(0)
#define __FD_SAFE_GET(n, code) (((unsigned)(n) < FD_SETSIZE) ? (code) : 0)

#define FD_SET(n, p)    __FD_SAFE_SET(n, ((p)->fds_bits[(n) / NFDBITS] |=  (1L << ((n) % NFDBITS))))
#define FD_CLR(n, p)    __FD_SAFE_SET(n, ((p)->fds_bits[(n) / NFDBITS] &= ~(1L << ((n) % NFDBITS))))
#define FD_ISSET(n, p)  __FD_SAFE_GET(n, ((p)->fds_bits[(n) / NFDBITS] &   (1L << ((n) % NFDBITS))))
#endif // FD_ISSET || FD_SET || FD_CLR

#endif //__ESP_SYS_SELECT_H__