checking for stringprep_check_version in -lidn... yes
checking for Libidn version >= 0.3.0... no
configure: error: Libidn >= 0.3.0 not found

[~@serv_1 jabberd-2.2.9]# rpm -qa | grep libidn
libidn-0.6.5-1.1
libidn-devel-0.6.5-1.1

#include < stdio.h >
#include < unistd.h >
 
static void PrintMessage(int i);
static void GoToSleep(void);
 
 
int main(void)
{
	int i = 100000;
 
	while ( 1 )
	{
		PrintMessage( i );
		GoToSleep();
		i -= 1;
	}
 
	return 0;
}
 
 
 
void PrintMessage(int i)
{
		char buf[1024];
		sprintf(buf,"%d bottles of beer on the wall.\n", i);
		printf("%s",buf);
 
}
 
 
 
static void GoToSleep(void)
{
	sleep(3);
}

TARGET = test
SRC    =  $(TARGET).c
OBJ    =  $(TARGET).o
CC     =  gcc
CFLAGS = -g3 -W -Wall -std=c99
 
$(TARGET): $(OBJS)
 
 
.PHONY: clean
 
clean:
	$(RM) $(TARGET) $(OBJS)

~@hqlong ps -ef | grep "test"

~@hqlong make

hqlong@ubuntu:/tmp$ gdb test
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http ://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
(gdb) b 1
Breakpoint 1 at 0x80483f4: file beer-process.c, line 1.
(gdb) r
Starting program: /tmp/test 
 
Breakpoint 1, main () at beer-process.c:9
warning: Source file is more recent than executable.
9	{
(gdb) n
main () at beer-process.c:10
10		int i = 100000;
(gdb) q
The program is running.  Exit anyway? (y or n) y
</http>

hqlong@ubuntu:/tmp$ ./test &
100000 bottles of beer on the wall.
[1] 25292

~@hqlong gdb --pid 25552

~@hqlong gdb test 25552

~@hqlong gdb
gdb) attach 25552

hqlong@ubuntu:/tmp$ ./test &
[1] 25615
hqlong@ubuntu:/tmp$ 100000 bottles of beer on the wall.
99999 bottles of beer on the wall.
99998 bottles of beer on the wall.

hqlong@ubuntu:/tmp$ gdb --pid 25615
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http ://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
Attaching to process 25615
Reading symbols from /tmp/test...done.
Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
0xb7ffb430 in __kernel_vsyscall ()
(gdb) 
</http>

(gdb) bt
#0  0xb7ffb430 in __kernel_vsyscall ()
#1  0xb7f23780 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7f235be in sleep () from /lib/tls/i686/cmov/libc.so.6
#3  0x0804851e in GoToSleep () at beer-process.c:35
#4  0x080484ac in main () at beer-process.c:15
(gdb)

(gdb) frame 4
#4  0x080484ac in main () at beer-process.c:15
15			GoToSleep();
(gdb)

(gdb) n
Single stepping until exit from function sleep, 
which has no line number information.
GoToSleep () at beer-process.c:36
36	}
(gdb) 
main () at beer-process.c:16
16			i -= 1;
(gdb) 
14			PrintMessage( i );
(gdb)

(gdb) 
14			PrintMessage( i );
(gdb) s
PrintMessage (i=99897) at beer-process.c:25
25	{
(gdb) n
27	    sprintf(buf,"%d bottles of beer on the wall.\n", i);
(gdb) n
28		printf("%s",buf);
(gdb)

(gdb) p i
$1 = 99897
(gdb) p buf
$2 = "99897 bottles of beer on the wall.\n\000\000R\000�0u������$u���\227\001�\000\000\000\000p���\000\000\000\000\000\000\000\000\001\000\000\000��DB�x��8���\000\000\000\000�\217\001�p\226\001�0u��$u���\226\000�\001\000\000\000\000\000\000\000�v���\222\001�\205���", '\0' <repeats 12 times>, "�\226\000��\217\001�\000\000\000\000\000u���t���\020\001�\b\000\000\000\f\000\000\000\000����v��b\221\000�\000���\020���\f\000\000\000�\217"...
(gdb) 
</repeats>

(gdb) p *buf@strlen(buf)
$3 = "99897 bottles of beer on the wall.\n"
(gdb)

(gdb) 
28		printf("%s",buf);

99897 bottles of beer on the wall.

(gdb) finish 
Run till exit from #0  PrintMessage (i=99895) at beer-process.c:28
main () at beer-process.c:15
15			GoToSleep();
(gdb)

(gdb) q
The program is running.  Quit anyway (and detach it)? (y or n) y
Detaching from program: /tmp/test, process 25615

for (;;) {
	if ((connfd = accept(listenfd, (struct sockaddr *) &clientaddr,
					&clientaddrlen)) == -1) {
		perror("http server: accept error");
		continue;
	}
	if (fork() == 0)
		accept_request(connfd);
	else close(connfd);
 
	int statloc;
	waitpid(-1, &statloc, WNOHANG);
}

(gdb) set follow-fork-mode child

g++ .... -lself -I/inc -L/lib

g++ .... -lself -lxx -I/inc -L/lib

sudo dpkg -i cxchromium_0.9.0-1_i386.deb

hqlong@~$ php -r "echo 'hqlong';"

hqlong@~$ php -q test.php

nmap < F5 > < ESC >:!clear && php -q < C-R >%< cr >

< ? php
    echo "hqlong";
?>

nmap < F6 > < ESC >:!clear && g++ < C-R >% -o test && ./test< cr >

# include < iostream >
using namespace std;
 
int main() {
     cout ＜＜ "hqlong";
    return 0;
}

#include < stdio.h>
int main() {
    printf("hello world\n");
    return 0;
}

~@ubuntu:~$ gcc hello.c -o hello

#include < stdio.h>
#include "global.h"
 
int main() {
    echo("hello\n");
    return 0;
}

void echo (char* str);

#include < stdio.h>
#include "global.h"
 
void echo (char* str) {
    printf("%s",str);
}

~@ubuntu:~$ gcc global.c hello.c -o hello

~@ubuntu:~$ gcc -o global.c
~@ubuntu:~$ gcc global.o hello.c -o hello

hello:global.o hello.o
    gcc hello.o global.o -o hello
hello.o:hello.c global.h
    gcc -c hello.c -o hello.o
global.o:global.c global.h
    gcc -c global.c -o global.o
clean:
    rm *.o hello

~@ubuntu:~$ make
gcc -c global.c -o global.o
gcc -c hello.c -o hello.o
gcc hello.o global.o -o hello

#include <stdio .h>
#include < stdlib .h>
#include < errno .h>
#include < string .h>
#include < sys /types.h>
#include < netinet /in.h>
#include < sys /socket.h>
#include < sys /wait.h>
 
#define SERVPORT 3333 
#define BACKLOG 10
#define MAXSIZE 1024
 
int main() {
    int sockfd,client_fd;
    struct sockaddr_in my_addr;
    struct sockaddr_in remote_addr;
    //创建套接字
    if ((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1) {
        perror("socket create failed!");
        exit(1);
    }
 
    //绑定端口地址
    my_addr.sin_family      = AF_INET;
    my_addr.sin_port        = htons(SERVPORT);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    bzero(&(my_addr.sin_zero),8);
    if (bind(sockfd, (struct sockaddr*)&my_addr, sizeof(struct sockaddr)) == -1) {
        perror("bind error!");
        exit(1);
    }
 
    //监听端口
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen error");
        exit(1); 
    }
 
    while (1) {
        int sin_size = sizeof(struct sockaddr_in);    
        if ((client_fd = accept(sockfd, (struct sockaddr*)&remote_addr,&sin_size)) == -1) {
            perror("accept error!");
            continue;
        }
        printf("Received a connection from %s\n", (char*)inet_ntoa(remote_addr.sin_addr));
 
       //子进程段
        if (!fork()) {
            //接受client发送的请示信息
            int rval;
            char buf[MAXSIZE];   
            if ((rval = read(client_fd, buf, MAXSIZE)) < 0) {
                perror("reading stream error!");
                continue;
            }
            printf("%s\n",buf);
 
            //向client发送信息
            char* msg = "Hello,Mr hqlong, you are connected!\n";
            if (send(client_fd, msg, strlen(msg), 0) == -1) perror("send error!");
            close(client_fd);
            exit(0);
        } 
        close(client_fd);
    }
    return 0;
}

hqlong@ubuntu:~$ gcc server.c -o server
hqlong@ubuntu:~$./server &

hqlong@ubuntu:~/t$ netstat -nl | grep 3333
tcp        0      0 0.0.0.0:3333            0.0.0.0:*               LISTEN

hqlong@ubuntu:~$ telnet 127.0.0.1 3333
Trying 127.0.0.1...
Received a connection from 127.0.0.1
Connected to 127.0.0.1.
Escape character is '^]'.
test
test
 
Hello,Mr hqlong, you are connected!
Connection closed by foreign host.

#include < stdio .h>
#include < stdlib .h>
#include < errno .h>
#include < string .h>
#include < sys /types.h>
#include < netinet /in.h>
#include < sys /socket.h>
#include < sys /wait.h>
 
#define SERVPORT 3333
#define MAXDATASIZE 100
#define SERVER_IP "127.0.0.1"
#define DATA  "this is a client message"
 
int main(int argc, char* argv[]) {
    int sockfd, recvbytes;
    char buf[MAXDATASIZE];
    struct hostent *host;
    struct sockaddr_in serv_addr;
 
    if (( sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket error!");
        exit(1);
    }
    bzero(&serv_addr,sizeof(serv_addr));
    serv_addr.sin_family    = AF_INET;
    serv_addr.sin_port      = htons(SERVPORT);
    serv_addr.sin_addr.s_addr= inet_addr(SERVER_IP);
 
    if (connect(sockfd, (struct sockaddr *)&serv_addr,sizeof(struct sockaddr)) == -1) {
        perror("connect error!");
        exit(1);
    }
 
    write(sockfd,DATA, sizeof(DATA));
   if ((recvbytes = recv(sockfd, buf, MAXDATASIZE,0)) == -1) {
        perror("recv error!");
        exit(1);
    }
 
    buf[recvbytes] = '\0';
    printf("Received: %s",buf);
    close(sockfd);
    return 0;
}

hqlong@ubuntu:~$ gcc client.c -o client
hqlong@ubuntu:~$ ./client
Received a connection from 127.0.0.1
Hello,Mr hqlong, you are connected!
Connection closed by foreign host.