diff options
| -rw-r--r-- | src/select/select.c | 44 |
1 files changed, 31 insertions, 13 deletions
diff --git a/src/select/select.c b/src/select/select.c index 02fd75c3..e84c887f 100644 --- a/src/select/select.c +++ b/src/select/select.c @@ -4,22 +4,40 @@ #include <errno.h> #include "syscall.h" +#define IS32BIT(x) !((x)+0x80000000ULL>>32) +#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63)) + int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, struct timeval *restrict tv) { + time_t s = tv ? tv->tv_sec : 0; + suseconds_t us = tv ? tv->tv_usec : 0; + long ns; + const time_t max_time = (1ULL<<8*sizeof(time_t)-1)-1; + + if (s<0 || us<0) return __syscall_ret(-EINVAL); + if (us/1000000 > max_time - s) { + s = max_time; + us = 999999; + ns = 999999999; + } else { + s += us/1000000; + us %= 1000000; + ns = us*1000; + } + +#ifdef SYS_pselect6_time64 + int r = -ENOSYS; + if (SYS_pselect6 == SYS_pselect6_time64 || !IS32BIT(s)) + r = __syscall_cp(SYS_pselect6_time64, n, rfds, wfds, efds, + tv ? ((long long[]){s, ns}) : 0, + ((syscall_arg_t[]){ 0, _NSIG/8 })); + if (SYS_pselect6 == SYS_pselect6_time64 || r!=-ENOSYS) + return __syscall_ret(r); +#endif #ifdef SYS_select - return syscall_cp(SYS_select, n, rfds, wfds, efds, tv); + return syscall_cp(SYS_select, n, rfds, wfds, efds, ((long[]){s, us})); #else - syscall_arg_t data[2] = { 0, _NSIG/8 }; - struct timespec ts; - if (tv) { - if (tv->tv_sec < 0 || tv->tv_usec < 0) - return __syscall_ret(-EINVAL); - time_t extra_secs = tv->tv_usec / 1000000; - ts.tv_nsec = tv->tv_usec % 1000000 * 1000; - const time_t max_time = (1ULL<<8*sizeof(time_t)-1)-1; - ts.tv_sec = extra_secs > max_time - tv->tv_sec ? - max_time : tv->tv_sec + extra_secs; - } - return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, tv ? &ts : 0, data); + return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, + tv ? ((long[]){s, ns}) : 0, ((syscall_arg_t[]){ 0, _NSIG/8 })); #endif } |