github.com/afumu/libc@v0.0.6/musl/src/network/setsockopt.c (about)

     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  }