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

     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  }