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