unix domain socket示例一(SOCK_DGRAM)

2024-06-28 13:26:15

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unix domain socket 是ipC通信的一種方式，可用于與管理進程間通信，同時由和網絡socket統一，所以很好管理，使用還是比較多。現舉個例子：

server.c

 1 #include <stdio.h> 2 #include <string.h> 3 #include <unistd.h> 4 #include <stdlib.h> 5 #include <sys/types.h> 6 #include <sys/socket.h> 7 #include <sys/un.h> 8 #include <stddef.h> 9 10 #define SRC_ADDR "/var/run/uds_test.socket"11 12 int main (int argc, char **argv)13 {14     int sockfd;15     struct sockaddr_un src;16     int ret;17 18     unlink (SRC_ADDR);19     sockfd = socket (AF_UNIX, SOCK_DGRAM, 0);20     if (sockfd < 0) {21         perror ("create socket failed");22         exit (EXIT_FAILURE);23     }24 25     memset (&src, 0, sizeof (src));26     src.sun_family = AF_UNIX;27     strcpy (src.sun_path, SRC_ADDR);28     int len;29     len = offsetof (struct sockaddr_un, sun_path) +30         sizeof (SRC_ADDR);31 32     if (bind (sockfd, (struct sockaddr *)&src, len) < 0) {33         perror ("bind socket failed");34         exit (EXIT_FAILURE);35     }36 37     size_t size = 0;38     char buf[BUFSIZ] ={'/0'};39     for (;;) {40         size = recvfrom (sockfd,buf, BUFSIZ,0,41                 NULL, NULL);42 43         if (size > 0)44             PRintf ("recv: %s/n", buf);45 46     }47 48     return 0;49 }

client.c

#include <stdio.h>#include <string.h>#include <unistd.h>#include <stdlib.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/un.h>#include <stddef.h>#include <time.h>#define DST_ADDR "/var/run/uds_test.socket"int main (int argc, char **argv){    int sockfd;    struct sockaddr_un dst;    int ret;    sockfd = socket (AF_UNIX, SOCK_DGRAM, 0);    if (sockfd < 0) {        perror ("create socket failed");        exit (EXIT_FAILURE);    }    memset (&dst, 0, sizeof (dst));    dst.sun_family = AF_UNIX;    strcpy (dst.sun_path, DST_ADDR);    int len;    len = offsetof (struct sockaddr_un, sun_path) +        sizeof (DST_ADDR);    time_t t;    char *str;    for (;;) {        t = time (NULL);        str = ctime (&t);        if (str == NULL)            break;        sendto (sockfd, str, strlen (str),0,                (struct sockaddr *)&dst,len);        sleep (1);    }    return 0;    }

這個demo實現client端讀取當前的時間，然后通過UDS發送給服務器端，結果如圖所示：