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

   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 }