source: azure_iot_hub/trunk/musl-1.1.18/src/select/select.c@ 389

Last change on this file since 389 was 389, checked in by coas-nagasima, 5 years ago

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File size: 793 bytes
Line 
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}
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