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/*
* lib/krb5/os/net_write.c
*
* Copyright 1987, 1988, 1990, 2009 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*/
#include "k5-int.h"
#include "os-proto.h"
/*
* krb5_net_write() writes "len" bytes from "buf" to the file
* descriptor "fd". It returns the number of bytes written or
* a write() error. (The calling interface is identical to
* write(2).)
*
* XXX must not use non-blocking I/O
*/
int
krb5_net_write(krb5_context context, int fd, const char *buf, int len)
{
sg_buf sg;
SG_SET(&sg, buf, len);
return krb5int_net_writev(context, fd, &sg, 1);
}
int
krb5int_net_writev(krb5_context context, int fd, sg_buf *sgp, int nsg)
{
int cc, len = 0;
SOCKET_WRITEV_TEMP tmp;
while (nsg > 0) {
/* Skip any empty data blocks. */
if (SG_LEN(sgp) == 0) {
sgp++, nsg--;
continue;
}
cc = SOCKET_WRITEV((SOCKET)fd, sgp, nsg, tmp);
if (cc < 0) {
if (SOCKET_ERRNO == SOCKET_EINTR)
continue;
/* XXX this interface sucks! */
errno = SOCKET_ERRNO;
return -1;
}
len += cc;
while (cc > 0) {
if ((unsigned)cc < SG_LEN(sgp)) {
SG_ADVANCE(sgp, (unsigned)cc);
cc = 0;
} else {
cc -= SG_LEN(sgp);
sgp++, nsg--;
assert(nsg > 0 || cc == 0);
}
}
}
return len;
}
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