setsockopt.c raw

   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  }
  47