/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ #include "../nolibc.h" #ifndef _NOLIBC_SYS_SELECT_H#define _NOLIBC_SYS_SELECT_H #include <linux/time.h>#include <linux/unistd.h> /* commonly an fd_set represents 256 FDs */#ifndef FD_SETSIZE#define FD_SETSIZE     256#endif #define FD_SETIDXMASK (8 * sizeof(unsigned long))#define FD_SETBITMASK (8 * sizeof(unsigned long)-1) /* for select() */typedef struct {	unsigned long fds[(FD_SETSIZE + FD_SETBITMASK) / FD_SETIDXMASK];} fd_set; #define FD_CLR(fd, set) do {						\		fd_set *__set = (set);					\		int __fd = (fd);					\		if (__fd >= 0)						\			__set->fds[__fd / FD_SETIDXMASK] &=		\				~(1U << (__fd & FD_SETBITMASK));	\	} while (0) #define FD_SET(fd, set) do {						\		fd_set *__set = (set);					\		int __fd = (fd);					\		if (__fd >= 0)						\			__set->fds[__fd / FD_SETIDXMASK] |=		\				1 << (__fd & FD_SETBITMASK);		\	} while (0) #define FD_ISSET(fd, set) ({						\			fd_set *__set = (set);				\			int __fd = (fd);				\		int __r = 0;						\		if (__fd >= 0)						\			__r = !!(__set->fds[__fd / FD_SETIDXMASK] &	\1U << (__fd & FD_SETBITMASK));						\		__r;							\	}) #define FD_ZERO(set) do {						\		fd_set *__set = (set);					\		int __idx;						\		int __size = (FD_SETSIZE+FD_SETBITMASK) / FD_SETIDXMASK;\		for (__idx = 0; __idx < __size; __idx++)		\			__set->fds[__idx] = 0;				\	} while (0) /* * int select(int nfds, fd_set *read_fds, fd_set *write_fds, *            fd_set *except_fds, struct timeval *timeout); */ static __attribute__((unused))int _sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout){#if defined(__NR_pselect6_time64)	struct __kernel_timespec t; 	if (timeout) {		t.tv_sec  = timeout->tv_sec;		t.tv_nsec = (uint32_t)timeout->tv_usec * 1000;	}	return __nolibc_syscall6(__NR_pselect6_time64, nfds, rfds, wfds, efds,				 timeout ? &t : NULL, NULL);#else	struct __kernel_old_timespec t; 	if (timeout) {		t.tv_sec  = timeout->tv_sec;		t.tv_nsec = (uint32_t)timeout->tv_usec * 1000;	}	return __nolibc_syscall6(__NR_pselect6, nfds, rfds, wfds, efds,				 timeout ? &t : NULL, NULL);#endif} static __attribute__((unused))int select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *timeout){	return __sysret(_sys_select(nfds, rfds, wfds, efds, timeout));}  #endif /* _NOLIBC_SYS_SELECT_H */