mirror of https://github.com/c-ares/c-ares.git
that lacks the writev function.pull/1/head
Yang Tse
17 years ago
parent
25d9912b38
commit
1a9795b401
10 changed files with 245 additions and 44 deletions
@ -0,0 +1,77 @@ |
||||
|
||||
/* $Id$ */ |
||||
|
||||
/* Copyright 1998 by the Massachusetts Institute of Technology.
|
||||
* |
||||
* 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. |
||||
* 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 "setup.h" |
||||
|
||||
#include <limits.h> |
||||
#include "ares.h" |
||||
#include "ares_private.h" |
||||
|
||||
#ifndef HAVE_WRITEV |
||||
ssize_t ares_writev(ares_socket_t s, const struct iovec *iov, int iovcnt) |
||||
{ |
||||
char *buffer, *bp; |
||||
int i; |
||||
size_t bytes = 0; |
||||
ssize_t result; |
||||
|
||||
/* Validate iovcnt */ |
||||
if (iovcnt <= 0) |
||||
{ |
||||
SET_ERRNO(EINVAL); |
||||
return (-1); |
||||
} |
||||
|
||||
/* Validate and find the sum of the iov_len values in the iov array */ |
||||
for (i = 0; i < iovcnt; i++) |
||||
{ |
||||
if (iov[i].iov_len > INT_MAX - bytes) |
||||
{ |
||||
SET_ERRNO(EINVAL); |
||||
return (-1); |
||||
} |
||||
bytes += iov[i].iov_len; |
||||
} |
||||
|
||||
if (bytes == 0) |
||||
return (0); |
||||
|
||||
/* Allocate a temporary buffer to hold the data */ |
||||
buffer = malloc(bytes); |
||||
if (!buffer) |
||||
{ |
||||
SET_ERRNO(ENOMEM); |
||||
return (-1); |
||||
} |
||||
|
||||
/* Copy the data into buffer */ |
||||
for (bp = buffer, i = 0; i < iovcnt; ++i) |
||||
{ |
||||
memcpy (bp, iov[i].iov_base, iov[i].iov_len); |
||||
bp += iov[i].iov_len; |
||||
} |
||||
|
||||
/* Send buffer contents */ |
||||
result = swrite(s, buffer, bytes); |
||||
|
||||
free(buffer); |
||||
|
||||
return (result); |
||||
} |
||||
#endif |
||||
|
||||
@ -0,0 +1,37 @@ |
||||
#ifndef HEADER_CARES_WRITEV_H |
||||
#define HEADER_CARES_WRITEV_H |
||||
|
||||
/* $Id$ */ |
||||
|
||||
/* Copyright 1998 by the Massachusetts Institute of Technology.
|
||||
* |
||||
* 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. |
||||
* 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 "setup.h" |
||||
#include "ares.h" |
||||
|
||||
#ifndef HAVE_WRITEV |
||||
|
||||
/* Structure for scatter/gather I/O. */ |
||||
struct iovec |
||||
{ |
||||
void *iov_base; /* Pointer to data. */ |
||||
size_t iov_len; /* Length of data. */ |
||||
}; |
||||
|
||||
extern ssize_t ares_writev(ares_socket_t s, const struct iovec *iov, int iovcnt); |
||||
|
||||
#endif |
||||
|
||||
#endif /* HEADER_CARES_WRITEV_H */ |
||||
Loading…
Reference in new issue