From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/select/select.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 src/select/select.c (limited to 'src/select/select.c') diff --git a/src/select/select.c b/src/select/select.c new file mode 100644 index 0000000..f1d7286 --- /dev/null +++ b/src/select/select.c @@ -0,0 +1,45 @@ +#include +#include +#include +#include +#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); + s = CLAMP(s); +#endif +#ifdef SYS_select + return syscall_cp(SYS_select, n, rfds, wfds, efds, + tv ? ((long[]){s, us}) : 0); +#else + return syscall_cp(SYS_pselect6, n, rfds, wfds, efds, + tv ? ((long[]){s, ns}) : 0, ((syscall_arg_t[]){ 0, _NSIG/8 })); +#endif +} -- cgit v1.2.3