1#include <sys/select.h>
2#include <signal.h>
3#include <stdint.h>
4#include <errno.h>
5#include "syscall.h"
6#include "libc.h"
7
8int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, struct timeval *restrict tv)
9{
10#ifdef SYS_select
11	return syscall_cp(SYS_select, n, rfds, wfds, efds, tv);
12#else
13	syscall_arg_t data[2] = { 0, _NSIG/8 };
14	struct timespec ts;
15	if (tv) {
16		if (tv->tv_sec < 0 || tv->tv_usec < 0)
17			return __syscall_ret(-EINVAL);
18		time_t extra_secs = tv->tv_usec / 1000000;
19		ts.tv_nsec = tv->tv_usec % 1000000 * 1000;
20		const time_t max_time = (1ULL<<8*sizeof(time_t)-1)-1;
21		ts.tv_sec = extra_secs > max_time - tv->tv_sec ?
22			max_time : tv->tv_sec + extra_secs;
23	}
24	return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, tv ? &ts : 0, data);
25#endif
26}
27