nsz Git - musl/blob - src/network/getsockopt.c

   1 #include <sys/socket.h>
   2 #include <sys/time.h>
   3 #include <errno.h>
   4 #include "syscall.h"
   5
   6 int getsockopt(int fd, int level, int optname, void *restrict optval, socklen_t *restrict optlen)
   7 {
   8         long tv32[2];
   9         struct timeval *tv;
  10
  11         int r = __socketcall(getsockopt, fd, level, optname, optval, optlen, 0);
  12
  13         if (r==-ENOPROTOOPT) switch (level) {
  14         case SOL_SOCKET:
  15                 switch (optname) {
  16                 case SO_RCVTIMEO:
  17                 case SO_SNDTIMEO:
  18                         if (SO_RCVTIMEO == SO_RCVTIMEO_OLD) break;
  19                         if (*optlen < sizeof *tv) return __syscall_ret(-EINVAL);
  20                         if (optname==SO_RCVTIMEO) optname=SO_RCVTIMEO_OLD;
  21                         if (optname==SO_SNDTIMEO) optname=SO_SNDTIMEO_OLD;
  22                         r = __socketcall(getsockopt, fd, level, optname,
  23                                 tv32, (socklen_t[]){sizeof tv32}, 0);
  24                         if (r<0) break;
  25                         tv = optval;
  26                         tv->tv_sec = tv32[0];
  27                         tv->tv_usec = tv32[1];
  28                         *optlen = sizeof *tv;
  29                         break;
  30                 case SO_TIMESTAMP:
  31                 case SO_TIMESTAMPNS:
  32                         if (SO_TIMESTAMP == SO_TIMESTAMP_OLD) break;
  33                         if (optname==SO_TIMESTAMP) optname=SO_TIMESTAMP_OLD;
  34                         if (optname==SO_TIMESTAMPNS) optname=SO_TIMESTAMPNS_OLD;
  35                         r = __socketcall(getsockopt, fd, level,
  36                                 optname, optval, optlen, 0);
  37                         break;
  38                 }
  39         }
  40         return __syscall_ret(r);
  41 }