contrib/bind-9.5.2/lib/bind/bsd/writev.c

   1 #ifndef LINT
   2 static const char rcsid[] = "$Id: writev.c,v 1.3 2005/04/27 04:56:13 sra Exp $";
   3 #endif
   4
   5 #include "port_before.h"
   6
   7 #include <sys/types.h>
   8 #include <sys/uio.h>
   9 #include <sys/stat.h>
  10 #include <sys/socket.h>
  11
  12 #include "port_after.h"
  13
  14 #ifndef NEED_WRITEV
  15 int __bindcompat_writev;
  16 #else
  17
  18 #ifdef _CRAY
  19 #define OWN_WRITEV
  20 int
  21 __writev(int fd, struct iovec *iov, int iovlen)
  22 {
  23         struct stat statbuf;
  24
  25         if (fstat(fd, &statbuf) < 0)
  26                 return (-1);
  27
  28         /*
  29          * Allow for atomic writes to network.
  30          */
  31         if (statbuf.st_mode & S_IFSOCK) {
  32                 struct msghdr   mesg;
  33
  34                 memset(&mesg, 0, sizeof(mesg));
  35                 mesg.msg_name = 0;
  36                 mesg.msg_namelen = 0;
  37                 mesg.msg_iov = iov;
  38                 mesg.msg_iovlen = iovlen;
  39                 mesg.msg_accrights = 0;
  40                 mesg.msg_accrightslen = 0;
  41                 return (sendmsg(fd, &mesg, 0));
  42         } else {
  43                 struct iovec *tv;
  44                 int i, rcode = 0, count = 0;
  45
  46                 for (i = 0, tv = iov; i <= iovlen; tv++) {
  47                         rcode = write(fd, tv->iov_base, tv->iov_len);
  48
  49                         if (rcode < 0)
  50                                 break;
  51
  52                         count += rcode;
  53                 }
  54
  55                 if (count == 0)
  56                         return (rcode);
  57                 else
  58                         return (count);
  59         }
  60 }
  61
  62 #else /*_CRAY*/
  63
  64 int
  65 __writev(fd, vp, vpcount)
  66         int fd;
  67         const struct iovec *vp;
  68         int vpcount;
  69 {
  70         int count = 0;
  71
  72         while (vpcount-- > 0) {
  73                 int written = write(fd, vp->iov_base, vp->iov_len);
  74
  75                 if (written < 0)
  76                         return (-1);
  77                 count += written;
  78                 if (written != vp->iov_len)
  79                         break;
  80                 vp++;
  81         }
  82         return (count);
  83 }
  84
  85 #endif /*_CRAY*/
  86
  87 #endif /*NEED_WRITEV*/
  88
  89 /*! \file */