src/network/setsockopt.c

   1 #include <sys/socket.h>
   2 #include <sys/time.h>
   3 #include <errno.h>
   4 #include "syscall.h"
   5
   6 #define IS32BIT(x) !((x)+0x80000000ULL>>32)
   7 #define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
   8
   9 int setsockopt(int fd, int level, int optname, const void *optval, socklen_t optlen)
  10 {
  11         const struct timeval *tv;
  12         time_t s;
  13         suseconds_t us;
  14
  15         int r = __socketcall(setsockopt, fd, level, optname, optval, optlen, 0);
  16
  17         if (r==-ENOPROTOOPT) switch (level) {
  18         case SOL_SOCKET:
  19                 switch (optname) {
  20                 case SO_RCVTIMEO:
  21                 case SO_SNDTIMEO:
  22                         if (SO_RCVTIMEO == SO_RCVTIMEO_OLD) break;
  23                         if (optlen < sizeof *tv) return __syscall_ret(-EINVAL);
  24                         tv = optval;
  25                         s = tv->tv_sec;
  26                         us = tv->tv_usec;
  27                         if (!IS32BIT(s)) return __syscall_ret(-ENOTSUP);
  28
  29                         if (optname==SO_RCVTIMEO) optname=SO_RCVTIMEO_OLD;
  30                         if (optname==SO_SNDTIMEO) optname=SO_SNDTIMEO_OLD;
  31
  32                         r = __socketcall(setsockopt, fd, level, optname,
  33                                 ((long[]){s, CLAMP(us)}), 2*sizeof(long), 0);
  34                         break;
  35                 case SO_TIMESTAMP:
  36                 case SO_TIMESTAMPNS:
  37                         if (SO_TIMESTAMP == SO_TIMESTAMP_OLD) break;
  38                         if (optname==SO_TIMESTAMP) optname=SO_TIMESTAMP_OLD;
  39                         if (optname==SO_TIMESTAMPNS) optname=SO_TIMESTAMPNS_OLD;
  40                         r = __socketcall(setsockopt, fd, level,
  41                                 optname, optval, optlen, 0);
  42                         break;
  43                 }
  44         }
  45         return __syscall_ret(r);
  46 }