1 files changed, 45 insertions, 0 deletions
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 <sys/select.h>
+#include <signal.h>
+#include <stdint.h>
+#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);
+	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
+}