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 #include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
int sock_fd;
struct  my_addr;
struct ifreq ifr;
    unsigned char * addr;
#define ETH_INTERFACE_NAME    "eth0"
    /**//* Get socket file descriptor */
    if ((sock_fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)...{
        perror("socket");
        exit(1);
    }
    /**//* Get IP Address */
    strncpy(ifr.ifr_name, ETH_INTERFACE_NAME, IF_NAMESIZE);
    ifr.ifr_name[IFNAMSIZ-1]='\0';
    if (ioctl(sock_fd, SIOCGIFADDR, &ifr) < 0)...{
        perror("ioctl");
        exit(1);
    }
    memcpy(&my_addr, &ifr.ifr_addr, sizeof(my_addr));
    addr=inet_ntoa(my_addr.sin_addr);


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/usr
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ǶÈëʽLinuxϲÊÉ«LCDÇý¶¯µÄÉè¼ÆÓëʵÏÖ
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Linuxϵͳdameon³ÌÐòµÄcore dumpÉèÖÃ

To enable dumps for every daemon:

ulimit -c unlimited >/dev/null 2>&1 (-c maximum size of core files)
ulimit -S -c ${DAEMON_COREFILE_LIMIT:-0} >/dev/null 2>&1

Dump for system
:
DAEMON_COREFILE_LIMIT='unlimited'

The same for every daemon (in /etc/sysconfig/_daemon_ ......

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int socket(int domain,int type,int protocol)
domain:˵Ã÷ͨѶ³ÌÐòËùÔÚÖ÷»úËù²ÉÓõÄͨѶЭÒéÀ ......

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#include <pthread.h>
pthread_t pthread_self(void);
pid_t getpid(void);
    getpid()ÓÃÀ´È¡µÃĿǰ½ø³ÌµÄ½ø³Ìʶ±ðÂë,º¯Êý˵Ã÷
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    ³ÌÐòÄ¿µÄ£ºÊµÏÖÔÚн¨Á¢µÄÏß³ÌÖдòÓ¡¸ÃÏ̵߳ÄidºÍ½ø ......
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