用tcp/IP进行网际互联-套接字API
感觉这边书比unix网络编程第一卷好，所以看这本书了
代码
1
#include
<
iostream
>
2
#include
<
netdb.h
>
3
#include
<
sys
/
socket.h
>
4
#include
<
unistd.h
>
5
6
using
namespace
std;
7
8
int
main(
void
)
9
{
10
struct
protoent
*
ptr;
11
12
if
(ptr
=
getprotobyname(
"
udp
"
))
13
{
14
char
**
pptr
=
ptr
->
p_aliases;
15
cout
<<
ptr
->
p_name
<<
endl;
16
17
while
(
*
pptr
!=
NULL)
18
{
19
cout
<<*
pptr
<<
endl;
20
pptr
++
;
21
}
22
cout
<<
ptr
->
p_proto
<<
endl;
23
}
24
else
25
{
26
cout
<<
"
error
"
<<
endl;
27
}
28
}
代码
1
#include
<
iostream
>
2
#include
<
unistd.h
>
3
#include
<
sys
/
types.h
>
4
#include
<
netdb.h
>
5
#include
<
sys
/
socket.h
>
6
#include
<
arpa
/
inet.h
>
7
#include
<
cstdlib
>
8
9
using
namespace
std;
10
int
main(
void
)
11
{
12
struct
hostent
*
hptr;
13
char
str[
20
];
14
gethostname(str,
sizeof
(str));
15
if
(hptr
=
gethostbyname(str))
16
{
17
cout
<<
hptr
->
h_name
<<
endl;
18
switch
(hptr
->
h_addrtype)
19
{
20
case
AF_INET:
21
cout
<<
"
AF_INET
"
<<
endl;
22
break
;
23
case
AF_INET6:
24
cout
<<
"
AF_INET6
"
<<
endl;
25
break
;
26
default
:
27
cout
<<
"
else
"
<<
endl;
28
break
;
29
}
30
char
**
ptr
=
hptr
->
h_aliases;
31
32
while
(
*
ptr
!=
NULL)
33
{
34
cout
<<*
ptr
<<
endl;
35
ptr
++
;
36
}
37
38
ptr
=
hptr
->
h_addr_list;
39
char
str[
32
];
40
41
while
(
*
ptr
!=
NULL)
42
{
43
cout
<<
inet_ntop(hptr
->
h_addrtype,
*
ptr,str,
sizeof
(str));
44
ptr
++
;
45
}
46
cout
<<
hptr
->
h_length
<<
endl;
47
}
48
else
49
{
50
cout
<<
"
error
"
<<
endl;
51
}
52
}
53
代码
1
#include
<
iostream
>
2
#include
<
netdb.h
>
3
#include
<
unistd.h
>
4
#include
<
sys
/
socket.h
>
5
#include
<
errno.h
>
6
7
using
namespace
std;
8
9
int
main(
void
)
10
{
11
struct
servent
*
ser_info;
12
13
if
(ser_info
=
getservbyname(
"
echo
"
,
"
udp
"
))
14
{
15
char
**
ptr;
16
cout
<<
ser_info
->
s_name
<<
endl;
17
ptr
=
ser_info
->
s_aliases;
18
while
(
*
ptr
!=
NULL)
19
{
20
cout
<<*
ptr
<<
endl;
21
ptr
++
;
22
}
23
cout
<<
(ser_info
->
s_port)
<<
endl;
24
cout
<<
ser_info
->
s_proto
<<
endl;
25
}
26
else
27
{
28
perror(
"
getservbyname:
"
);
29
}
30
}
31