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Socket options SO_RCVBUF, SO_SNDBUF, and TCP_NODELAY.

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This commit is contained in:
Philip Homburg 2006-02-17 13:45:41 +00:00
parent 38804a964b
commit 1991246020
2 changed files with 157 additions and 3 deletions
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67
lib/ip/getsockopt.c
View File

@ -5,21 +5,27 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>
#define DEBUG 0
static int _tcp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);
static int _udp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len);
int getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
int r;
nwio_tcpopt_t tcpopt;
nwio_udpopt_t udpopt;
r= ioctl(socket, NWIOGTCPOPT, &tcpopt);
if (r != -1 || errno != ENOTTY)
@ -33,10 +39,22 @@ int getsockopt(int socket, int level, int option_name,
option_value, option_len);
}
r= ioctl(socket, NWIOGUDPOPT, &udpopt);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _udp_getsockopt(socket, level, option_name,
option_value, option_len);
}
#if DEBUG
fprintf(stderr, "getsockopt: not implemented for fd %d\n", socket);
#endif
errno= ENOSYS;
errno= ENOTSOCK;
return -1;
}
@ -55,12 +73,57 @@ static int _tcp_getsockopt(int socket, int level, int option_name,
*option_len= sizeof(i);
return 0;
}
if (level == SOL_SOCKET && option_name == SO_RCVBUF)
{
i= 32*1024; /* Receive buffer in the current
* implementation
*/
if (*option_len < sizeof(i))
memcpy(option_value, &i, *option_len);
else
memcpy(option_value, &i, sizeof(i));
*option_len= sizeof(i);
return 0;
}
if (level == SOL_SOCKET && option_name == SO_SNDBUF)
{
i= 32*1024; /* Send buffer in the current implementation */
if (*option_len < sizeof(i))
memcpy(option_value, &i, *option_len);
else
memcpy(option_value, &i, sizeof(i));
*option_len= sizeof(i);
return 0;
}
if (level == IPPROTO_TCP && option_name == TCP_NODELAY)
{
i= 0; /* nodelay is always off */
if (*option_len < sizeof(i))
memcpy(option_value, &i, *option_len);
else
memcpy(option_value, &i, sizeof(i));
*option_len= sizeof(i);
return 0;
}
#if DEBUG
fprintf(stderr, "_tcp_getsocketopt: level %d, name %d\n",
level, option_name);
#endif
errno= ENOPROTOOPT;
return -1;
}
static int _udp_getsockopt(int socket, int level, int option_name,
void *_RESTRICT option_value, socklen_t *_RESTRICT option_len)
{
int i;
#if DEBUG
fprintf(stderr, "_udp_getsocketopt: level %d, name %d\n",
level, option_name);
#endif
errno= ENOSYS;
return -1;
}

93
lib/ip/setsockopt.c
View File

@ -4,21 +4,28 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/tcp.h>
#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>
#define DEBUG 0
static int _tcp_setsockopt(int socket, int level, int option_name,
const void *option_value, socklen_t option_len);
static int _udp_setsockopt(int socket, int level, int option_name,
const void *option_value, socklen_t option_len);
int setsockopt(int socket, int level, int option_name,
const void *option_value, socklen_t option_len)
{
int r;
nwio_tcpopt_t tcpopt;
nwio_udpopt_t udpopt;
r= ioctl(socket, NWIOGTCPOPT, &tcpopt);
if (r != -1 || errno != ENOTTY)
@ -32,10 +39,22 @@ int setsockopt(int socket, int level, int option_name,
option_value, option_len);
}
r= ioctl(socket, NWIOGUDPOPT, &udpopt);
if (r != -1 || errno != ENOTTY)
{
if (r == -1)
{
/* Bad file descriptor */
return -1;
}
return _udp_setsockopt(socket, level, option_name,
option_value, option_len);
}
#if DEBUG
fprintf(stderr, "setsockopt: not implemented for fd %d\n", socket);
#endif
errno= ENOSYS;
errno= ENOTSOCK;
return -1;
}
@ -62,6 +81,64 @@ static int _tcp_setsockopt(int socket, int level, int option_name,
}
return 0;
}
if (level == SOL_SOCKET && option_name == SO_RCVBUF)
{
if (option_len != sizeof(i))
{
errno= EINVAL;
return -1;
}
i= *(int *)option_value;
if (i > 32*1024)
{
/* The receive buffer is limited to 32K at the moment.
*/
errno= ENOSYS;
return -1;
}
/* There is no way to reduce the receive buffer, do we have to
* let this call fail for smaller buffers?
*/
return 0;
}
if (level == SOL_SOCKET && option_name == SO_SNDBUF)
{
if (option_len != sizeof(i))
{
errno= EINVAL;
return -1;
}
i= *(int *)option_value;
if (i > 32*1024)
{
/* The send buffer is limited to 32K at the moment.
*/
errno= ENOSYS;
return -1;
}
/* There is no way to reduce the send buffer, do we have to
* let this call fail for smaller buffers?
*/
return 0;
}
if (level == IPPROTO_TCP && option_name == TCP_NODELAY)
{
if (option_len != sizeof(i))
{
errno= EINVAL;
return -1;
}
i= *(int *)option_value;
if (i)
{
/* At the moment there is no way to turn on
* nodelay.
*/
errno= ENOSYS;
return -1;
}
return 0;
}
#if DEBUG
fprintf(stderr, "_tcp_setsocketopt: level %d, name %d\n",
level, option_name);
@ -71,3 +148,17 @@ static int _tcp_setsockopt(int socket, int level, int option_name,
return -1;
}
static int _udp_setsockopt(int socket, int level, int option_name,
const void *option_value, socklen_t option_len)
{
int i;
#if DEBUG
fprintf(stderr, "_udp_setsocketopt: level %d, name %d\n",
level, option_name);
#endif
errno= ENOSYS;
return -1;
}