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