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Make sure our assigned address is unique on our segment by using arp.

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This commit is contained in:
Nicholas J. Kain
2010-11-15 20:06:50 -05:00
parent 5eb3c18b01
commit 9dce1a0378
9 changed files with 235 additions and 20 deletions
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23
ncmlib/io.c
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@ -1,5 +1,5 @@
/* io.c - light wrappers for POSIX i/o functions
* Time-stamp: <2010-11-13 08:22:53 njk>
* Time-stamp: <2010-11-15 19:45:39 njk>
*
* (c) 2010 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
@ -28,6 +28,8 @@
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
/* returns -1 on error, >= 0 and equal to # chars read on success */
@ -65,3 +67,22 @@ int safe_write(int fd, const char *buf, int len)
}
return s;
}
/* returns -1 on error, >= 0 and equal to # chars written on success */
int safe_sendto(int fd, const char *buf, int len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen)
{
int r, s = 0;
while (s < len) {
r = sendto(fd, buf + s, len - s, flags, dest_addr, addrlen);
if (r == -1) {
if (errno == EINTR)
continue;
else
return -1;
}
s += r;
}
return s;
}