support linux kernel apis (new archs) with old syscalls removed

[musl] / src / select / select.c

diff --git a/src/select/select.c b/src/select/select.c
index f93597b..7b5f6dc 100644 (file)
--- a/src/select/select.c
+++ b/src/select/select.c
@@ -1,8 +1,26 @@
 #include <sys/select.h>
+#include <signal.h>
+#include <stdint.h>
+#include <errno.h>
 #include "syscall.h"
 #include "libc.h"
 
 int select(int n, fd_set *restrict rfds, fd_set *restrict wfds, fd_set *restrict efds, struct timeval *restrict tv)
 {
+#ifdef SYS_select
        return syscall_cp(SYS_select, n, rfds, wfds, efds, tv);
+#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);
+#endif
 }