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

     1  #include <sys/socket.h>
     2  #include <limits.h>
     3  #include <string.h>
     4  #include <errno.h>
     5  #include "syscall.h"
     6  
     7  ssize_t sendmsg(int fd, const struct msghdr *msg, int flags)
     8  {
     9  #if LONG_MAX > INT_MAX
    10  	struct msghdr h;
    11  	struct cmsghdr chbuf[1024/sizeof(struct cmsghdr)+1], *c;
    12  	if (msg) {
    13  		h = *msg;
    14  		h.__pad1 = h.__pad2 = 0;
    15  		msg = &h;
    16  		if (h.msg_controllen) {
    17  			if (h.msg_controllen > 1024) {
    18  				errno = ENOMEM;
    19  				return -1;
    20  			}
    21  			memcpy(chbuf, h.msg_control, h.msg_controllen);
    22  			h.msg_control = chbuf;
    23  			for (c=CMSG_FIRSTHDR(&h); c; c=CMSG_NXTHDR(&h,c))
    24  				c->__pad1 = 0;
    25  		}
    26  	}
    27  #endif
    28  	return socketcall_cp(sendmsg, fd, msg, flags, 0, 0, 0);
    29  }