{"id":48,"date":"2010-04-17T21:27:03","date_gmt":"2010-04-18T06:27:03","guid":{"rendered":"\/blog\/?p=48"},"modified":"2023-09-21T09:41:22","modified_gmt":"2023-09-21T00:41:22","slug":"unix-domain-socket%ec%9d%84-%ec%9d%b4%ec%9a%a9%ed%95%9c-ipc","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=48","title":{"rendered":"Unix Domain Socket\uc744 \uc774\uc6a9\ud55c IPC"},"content":{"rendered":"\n\n\n\n\n
Unix Domain Socket\uc744 \uc774\uc6a9\ud55c IPC<\/B>
Posted on 2002\/4\/7
Topic: \uc2dc\uc2a4\ud15c \ud504\ub85c\uadf8\ub7a8<\/FONT><\/U><\/A> <\/FONT><\/TD><\/TR>\n
article_UNIX \ub3c4\uba54\uc778\uc18c\ucf13\uc744 \uc774\uc6a9\ud55c IPC<\/FONT><\/U><\/A>\uc704\ud0a4 \ud648\uc73c\ub85c<\/B>

\n
Unix Domain Socket(\uc774\ud558 UDS) \ub294 socket API\ub97c \uc218\uc815\uc5c6\uc774 \uc774\uc6a9\uba70, port \uae30\ubc18\uc758 Inernet Domain Socket\uc5d0 \ube44\ud574\uc11c \ub85c\uceec \uc2dc\uc2a4\ud15c\uc758 \ud30c\uc77c\uc2dc\uc2a4\ud15c\uc744 \uc774\uc6a9\ud574\uc11c \ub0b4\ubd80\ud504\ub85c\uc138\uc2a4\uac04\uc758 \ud1b5\uc2e0\uc744 \uc704\ud574 \uc0ac\uc6a9\ud55c\ub2e4\ub294 \uc810\uc774 \ub2e4\ub974\ub2e4\uace0 \ud560\uc218 \uc788\ub2e4.

ls \ub97c \uc774\uc6a9\ud574\uc11c \ud1b5\uc2e0\uc744 \uc704\ud574\uc11c \ub9cc\ub4e4\uc5b4\uc9c4 \ud30c\uc77c\uc744 \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \ubaa8\uc2b5\uc744 \ubcf4\uc778\ub2e4. \n\n\n\n
[yundream@localhost tmp]$ ls -al\nsrwx------    1 root     nobody          0 12\uc6d4 14 21:16 .fam_socket\n<\/PRE><\/TD><\/TR><\/TBODY><\/TABLE>\ubcf4\uba74 \ud30c\uc77c\ud0c0\uc785\uc5d0 \"s\" \uac00 \ubd99\uc5b4 \uc788\ub294\uac78 \uc54c\uc218 \uc788\uc73c\uba70, \ud30c\uc77c\uc0ac\uc774\uc988\uac00 0\uc73c\ub85c \ub418\uc5b4 \uc788\ub294 \uac78 \uc54c\uc218 \uc788\ub2e4. \uc65c\ub0d0\ud558\uba74 FIFO\uc640 \ub9c8\ucc2c\uac00\uc9c0\ub85c \uba54\uc2dc\uc9c0\uac00 \ud30c\uc77c\ub85c \uc313\uc774\uc9c0 \uc54a\uace0 \ucee4\ub110\ub85c \uc804\ub2ec\ub418\uc5b4\uc11c \ucee4\ub110\uc5d0\uc11c \ucc98\ub9ac\ud558\uae30 \ub54c\ubb38\uc774\ub2e4.

\ud30c\uc77c\uc744 \ud1b5\ud574\uc11c \ud1b5\uc2e0\uc744 \ud558\uba70, \ucee4\ub110\ub0b4\ubd80\uc5d0\uc11c \uba54\uc2dc\uc9c0\ub97c \uad00\ub9ac\ud55c\ub2e4\ub294 \uc810\uc5d0\uc11c FIFO\uc640 \ub9e4\uc6b0 \uc720\uc0ac\ud55c\uba74\uc744 \ubcf4\uc5ec\uc8fc\uc9c0\ub9cc, FIFO\uc640\ub294 \ub2ec\ub9ac \uc591\ubc29\ud5a5 \ud1b5\uc2e0\uc774 \uac00\ub2a5\ud558\ub2e4\ub294 \ud2b9\uc9d5\uc744 \uac00\uc9c0\uace0 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \ub2e4\uc911\uc758 \ud074\ub77c\uc774\uc5b8\ud2b8\ub97c \ubc1b\uc544\ub4e4\uc774\ub294 \uc11c\ubc84\/\ud074\ub77c\uc774\uc5b8\ud2b8 \ubaa8\ub378\uc744 \ub9cc\ub4e4\uae30\uac00 \ub9e4\uc6b0 \uc27d\ub2e4.
\ub610\ud55c Inet \uc18c\ucf13\uc744 \ud1b5\ud55c \uc678\ubd80\ud1b5\uc2e0\uc5d0 \ube44\ud574\uc11c 2\ubc30 \uc774\uc0c1\uc758 \ud6a8\uc728\uc744 \ubcf4\uc5ec\uc900\ub2e4\ub77c\ub294 \uc7a5\uc810\uc744 \uac00\uc9c0\uace0 \uc788\ub2e4. 

\ub9ce\uc740 \uacbd\uc6b0 \uc57d\uac04 \ubcf5\uc7a1\ud55c \ub0b4\ubd80\ud504\ub85c\uc138\uc2a4\uac04 \ud1b5\uc2e0\uc744 \ud574\uc57c\ub41c\ub2e4\uace0 \ud588\uc744\ub54c UDS\uc744 \ub9ce\uc774 \uc0ac\uc6a9\ud55c\ub2e4. INET \uacc4\uce35\uc5d0\uc11c\uc758 \ud1b5\uc2e0\uc774 TCP\/IP 4\uacc4\uce35\uc744 \ubaa8\ub450 \uac70\uce58\ub294\uac83\uacfc\ub294 \ub2e4\ub974\uac8c, UDS \uc740 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35\uc5d0\uc11c TCP \uacc4\uce35\uae4c\uc9c0\ub9cc \uba54\uc2dc\uc9c0\uac00 \uc804\ub2ec\ub418\uace0, \ub2e4\uc2dc \uace7\ubc14\ub85c \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \uacc4\uce35\uc73c\ub85c \uba54\uc2dc\uc9c0\uac00 \uc62c\ub77c\uac00\uac8c \ub41c\ub2e4. TCP\/IP \uacc4\uce35\uc5d0 \ub300\ud55c \uc790\uc138\ud55c \ub0b4\uc6a9\uc740 TCP\/IP \uac1c\uc694(2)<\/FONT><\/U><\/A>\ub97c \ucc38\uace0 \ud558\uae30 \ubc14\ub780\ub2e4.

\uc704\uc5d0\uc11c INET \uc18c\ucf13\ubcf4\ub2e4 2\ubc30\uc774\uc0c1\uc758 \ud6a8\uc728\uc744 \uac00\uc9c4\ub2e4\uace0 \ud588\ub294\ub370, 4\uacc4\uce35\uc758 \ub808\uc774\uc5b4\ub97c \ubaa8\ub450 \uac70\uccd0\uc57c\ud558\ub294 INET \uc18c\ucf13\uc5d0 \ube44\ud574\uc11c \ub2e8\uc9c0 2\uac1c\uc758 \ub808\uc774\uc5b4\ub9cc \uc0ac\uc6a9\ud55c\ub2e4\ub294 \uc810\ub3c4 \uadf8 \uc774\uc720\uc911 \ud558\ub098\ub85c \uc791\uc6a9\ud55c\ub2e4.

\uc3d8\uc4f0 \ucf54\ub4dc\ub294 \ub2e4\uc911\uc5f0\uacb0\uc11c\ubc84 \ub9cc\ub4e4\uae30(1)<\/FONT><\/U><\/A>\uc758 zipcode_multi.c \uc640 \uc148\ud50c\ub85c \uc54c\uc544\ubcf4\ub294 \uc18c\ucf13\ud504\ub85c\uadf8\ub798\ubc0d(1)<\/FONT><\/U><\/A>\uc758 zipcode_cli.c \ub97c \uc0ac\uc6a9\ud558\ub3c4\ub85d\ud560\uac83\uc774\ub2e4.

\uc608\uc81c: zipcode_local.c<\/B> \n\n\n\n
#include<\/FONT> <sys\/types.h> \n#include<\/FONT> <sys\/stat.h> \n#include<\/FONT> <sys\/socket.h> \n#include<\/FONT> <sys\/un.h> \n#include<\/FONT> <unistd.h> \n#include<\/FONT> <stdio.h> \n#include<\/FONT> <stdlib.h> \n#include<\/FONT> <string.h> \n\nint<\/FONT><\/B> main(int<\/FONT><\/B> argc, char<\/FONT><\/B> **argv)\n{\n    int<\/FONT><\/B> server_sockfd, client_sockfd;\n    int<\/FONT><\/B> state, client_len;\n    pid_t pid;\n\n    FILE *fp;\n    struct<\/FONT><\/B> sockaddr_un clientaddr, serveraddr;\n\n    char<\/FONT><\/B> buf[255<\/FONT>];\n    char<\/FONT><\/B> line[255<\/FONT>];\n\n    if<\/FONT><\/B> (argc != 2<\/FONT>)\n    {\n        printf(\"Usage : .\/zipcode [file_name]\\n\"<\/FONT>);\n        printf(\"\uc608    : .\/zipcode \/tmp\/mysocket\\n\"<\/FONT>); \n        exit(0<\/FONT>);\n    }\n\n    memset(line, '0<\/FONT>', 255<\/FONT>);\n    state = 0<\/FONT>;\n\n    if<\/FONT><\/B> (access(argv[1<\/FONT>], F_OK) == 0<\/FONT>)\n    {\n        unlink(argv[1<\/FONT>]);\n    }\n    \/\/ \uc8fc\uc18c \ud30c\uc77c\uc744 \uc77d\uc5b4\ub4e4\uc778\ub2e4. \n    client_len = sizeof<\/FONT><\/B>(clientaddr);\n    if<\/FONT><\/B>((fp = fopen(\"zipcode.txt\"<\/FONT>, \"r\"<\/FONT>)) == NULL)\n    {\n        perror(\"file open error : \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n\n    \/\/ internet \uae30\ubc18\uc758 \uc2a4\ud2b8\ub9bc \uc18c\ucf13\uc744 \ub9cc\ub4e4\ub3c4\ub85d \ud55c\ub2e4. \n    if<\/FONT><\/B> ((server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0<\/FONT>)) < 0<\/FONT>)\n    {\n        perror(\"socket error : \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n    bzero(&serveraddr, sizeof<\/FONT><\/B>(serveraddr));\n    serveraddr.sun_family = AF_UNIX;\n    strcpy(serveraddr.sun_path, argv[1<\/FONT>]);\n\n\n    state = bind(server_sockfd , (struct<\/FONT><\/B> sockaddr *)&serveraddr, \n            sizeof<\/FONT><\/B>(serveraddr));\n    if<\/FONT><\/B> (state == -1<\/FONT>)\n    {\n        perror(\"bind error : \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n\n    state = listen(server_sockfd, 5<\/FONT>);\n    if<\/FONT><\/B> (state == -1<\/FONT>)\n    {\n        perror(\"listen error : \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n\n\n    printf(\"accept : \\n\"<\/FONT>);\n    while<\/FONT><\/B>(1<\/FONT>)\n    {\n        client_sockfd = accept(server_sockfd, (struct<\/FONT><\/B> sockaddr *)&clientaddr, \n                               &client_len);\n        printf(\"test test\\n\"<\/FONT>);\n        pid = fork<\/FONT><\/U><\/A>();\n        if<\/FONT><\/B> (pid == 0<\/FONT>)\n        {\n            if<\/FONT><\/B> (client_sockfd == -1<\/FONT>)\n            {\n                perror(\"Accept error : \"<\/FONT>);\n                exit(0<\/FONT>);\n            }\n            while<\/FONT><\/B>(1<\/FONT>)\n            {\n                memset(buf, '0<\/FONT>', 255<\/FONT>);\n                if<\/FONT><\/B> (read(client_sockfd, buf, 255<\/FONT>) <= 0<\/FONT>)\n                {\n                    close<\/FONT><\/U><\/A>(client_sockfd);\n                    fclose<\/FONT><\/U><\/A>(fp);\n                    exit(0<\/FONT>);\n                }\n\n                if<\/FONT><\/B> (strncmp(buf, \"quit\"<\/FONT>,4<\/FONT>) == 0<\/FONT>)\n                {\n                    write(client_sockfd, \"bye bye\\n\"<\/FONT>, 8<\/FONT>);  \n                    close<\/FONT><\/U><\/A>(client_sockfd);\n                    fclose<\/FONT><\/U><\/A>(fp);\n                    break<\/FONT><\/B>;\n                }\n\n                while<\/FONT><\/B>(fgets(line,255<\/FONT>,fp) != NULL)\n                {\n                    if<\/FONT><\/B> (strstr<\/FONT><\/U><\/A>(line, buf) != NULL)\n                        write(client_sockfd, line, 255<\/FONT>);\n                    memset(line, '0<\/FONT>', 255<\/FONT>);\n                }\n                write(client_sockfd, \"end\"<\/FONT>, 255<\/FONT>);\n                printf(\"send end\\n\"<\/FONT>);\n                rewind<\/FONT><\/U><\/A>(fp);\n            }\n        }\n    }\n    close<\/FONT><\/U><\/A>(client_sockfd);\n}\n<\/PRE><\/TD><\/TR><\/TBODY><\/TABLE>

\ub2e4\uc74c\uc740 \ud074\ub77c\uc774\uc5b8\ud2b8 \ud504\ub85c\uadf8\ub7a8\uc774\ub2e4.
\uc608\uc81c: zipcode_cli_local.c<\/B> \n\n\n\n
#include<\/FONT> <sys\/types.h> \n#include<\/FONT> <sys\/stat.h> \n#include<\/FONT> <sys\/socket.h> \n#include<\/FONT> <unistd.h> \n#include<\/FONT> <sys\/un.h> \n#include<\/FONT> <stdio.h> \n#include<\/FONT> <stdlib.h> \n#include<\/FONT> <string.h> \n\n\nint<\/FONT><\/B> main(int<\/FONT><\/B> argc, char<\/FONT><\/B> **argv)\n{\n\n    int<\/FONT><\/B> client_len;\n    int<\/FONT><\/B> client_sockfd;\n\n    FILE *fp_in;\n    char<\/FONT><\/B> buf_in[255<\/FONT>];\n    char<\/FONT><\/B> buf_get[255<\/FONT>];\n\n    struct<\/FONT><\/B> sockaddr_un clientaddr;\n\n    if<\/FONT><\/B> (argc != 2<\/FONT>)\n    {       \n        printf(\"Usage : .\/zipcode_cl [file_name]\\n\"<\/FONT>);\n        printf(\"\uc608    : .\/zipcode_cl \/tmp\/mysocket\\n\"<\/FONT>);\n        exit(0<\/FONT>);\n    }       \n\n\n    client_sockfd = socket(AF_UNIX, SOCK_STREAM, 0<\/FONT>);\n    if<\/FONT><\/B> (client_sockfd == -1<\/FONT>)\n    {\n        perror(\"error : \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n    bzero(&clientaddr, sizeof<\/FONT><\/B>(clientaddr));\n    clientaddr.sun_family = AF_UNIX;\n    strcpy(clientaddr.sun_path, argv[1<\/FONT>]);\n    client_len = sizeof<\/FONT><\/B>(clientaddr);\n    if<\/FONT><\/B> (connect(client_sockfd, (struct<\/FONT><\/B> sockaddr *)&clientaddr, client_len) < 0<\/FONT>)\n    {\n        perror(\"Connect error: \"<\/FONT>);\n        exit(0<\/FONT>);\n    }\n    while<\/FONT><\/B>(1<\/FONT>)\n    {\n        printf(\"\uc9c0\uc5ed\uc774\ub984 \uc785\ub825 : \"<\/FONT>);\n        fgets(buf_in, 255<\/FONT>,stdin);\n\n        buf_in[strlen<\/FONT><\/U><\/A>(buf_in) - 1<\/FONT>] = '0<\/FONT>';\n        write(client_sockfd, buf_in, 255<\/FONT>);\n        if<\/FONT><\/B> (strncmp(buf_in, \"quit\"<\/FONT>, 4<\/FONT>) == 0<\/FONT>)\n        {\n            close<\/FONT><\/U><\/A>(client_sockfd);\n            exit(0<\/FONT>);\n        }\n        while<\/FONT><\/B>(1<\/FONT>)\n        {\n            read(client_sockfd, buf_get, 255<\/FONT>); \n            if<\/FONT><\/B> (strncmp(buf_get, \"end\"<\/FONT>, 3<\/FONT>) == 0<\/FONT>)\n                break<\/FONT><\/B>;\n\n            printf(\"%s\"<\/FONT>, buf_get);\n        }\n    }\n\n    close<\/FONT><\/U><\/A>(client_sockfd);\n    exit(0<\/FONT>);\n}\n<\/PRE><\/TD><\/TR><\/TBODY><\/TABLE>

\uae30\uc874\uc758 INET \ubc84\uc83c\uc758 \ud504\ub85c\uadf8\ub7a8\uacfc \ube44\uad50\ud574 \ubcf4\uba74 \uace0\uc791 3\uc904 \uc815\ub3c4\ub9cc \uc218\uc815\ub418\uc5c8\uc74c\uc744 \uc54c\uc218 \uc788\uc744\uac83\uc774\ub2e4. \ub2e8\uc9c0 \uc18c\ucf13 \uad6c\uc870\uccb4\uac00 sockaddr_un \uc73c\ub85c \ubc14\ub00c\uace0, AF_INET \ub300\uc2e0 AF_UNIX \ub97c \uadf8\ub9ac\uace0 port \ubc88\ud638\ub300\uc2e0\uc5d0 \ud30c\uc77c\uba85\uc744 \uc0ac\uc6a9\ud588\uc74c\uc744 \uc54c\uc218 \uc788\ub2e4.

\ub098\uba38\uc9c0\uc758 \ubaa8\ub4e0 \ucf54\ub4dc\ub294 INET \ucf54\ub4dc\uc640 \uc644\uc804\ud788 \uac19\ub2e4. \uadf8\ub7ec\ubbc0\ub85c Unix Domain Socket \ub97c \uc0ac\uc6a9\ud558\uba74 Inet Domain Socket \uc640 \ucf54\ub4dc \uc77c\uad00\uc131\uc744 \uc720\uc9c0\ud560\uc218 \uc788\uc73c\uba70, \ub3d9\uc77c\ud55c \uae30\uc220\uc744 \uc0ac\uc6a9\ud574\uc11c \ud504\ub85c\uadf8\ub798\ubc0d\uc744 \ud560\uc218 \uc788\ub2e4. 

\ub610\ud55c \ub2e4\ub978 \ub300\ubd80\ubd84\uc758 IPC \uc124\ube44\ub4e4\uc774, \ubc94\uc6a9\uc801\uc73c\ub85c \uc0ac\uc6a9\ud558\uae30\uc5d0\ub294 \ubd80\uc871\ud55c \uc5ec\ub7ec\uac00\uc9c0 \ub2e8\uc810\ub4e4\uc744 \uac00\uc9c4\ubc18\uba74(\ub2e8\ubc29\ud5a5 \uc774\uac70\ub098, \uc77d\uae30\ub9cc \uac00\ub2a5\ud558\ub2e4\uac70\ub098, \uc81c\uc5b4\ud558\uae30\uac00 \uc5b4\ub824\uc6b4) UDS\ub294 \ub9e4\uc6b0 \ubc94\uc6a9\uc801\uc778 IPC \ub85c\uc368 \uc0ac\uc6a9\uac00\ub2a5\ud558\ub2e4\ub77c\ub294 \uc7a5\uc810\uc744 \uac00\uc9c0\uace0 \uc788\ub2e4.

\uc2e4\uc81c\ub85c X \uc11c\ubc84 \uac19\uc740\uacbd\uc6b0\uc5d0 \uc678\ubd80\uc5d0\uc11c\uc758 \uc811\uadfc\uc2dc\uc5d0\ub294 INET \uc5f0\uacb0\uc744 \ub0b4\ubd80\uc5d0\uc11c\uc758 \uc5f0\uacb0\uc744 \uc704\ud574\uc11c\ub294 UDS \ub97c \uc0ac\uc6a9\ud55c\ub2e4. \uc774\ubc16\uc5d0\ub3c4 mysql, pgsql, KDE, Gnome \uacfc \uac19\uc740 \ub300\ubd80\ubd84\uc758 \uc11c\ubc84\ud504\ub85c\uadf8\ub7a8\uc774 \ub0b4\ubd80\ud1b5\uc2e0\uc744 \uc704\ud574\uc11c UDS \ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/DIV><\/TD><\/TR><\/TBODY><\/TABLE>\n
 <\/P>\n
[\ud38c] http:\/\/blog.naver.com\/kopidat?Redirect=Log&logNo=40005289606 <\/A><\/P>\n","protected":false},"excerpt":{"rendered":"
Unix Domain Socket\uc744 \uc774\uc6a9\ud55c IPCPosted on 2002\/4\/7 Topic: \uc2dc\uc2a4\ud15c \ud504\ub85c\uadf8\ub7a8 article_UNIX \ub3c4\uba54\uc778\uc18c\ucf13\uc744 \uc774\uc6a9\ud55c IPC\uc704\ud0a4 \ud648\uc73c\ub85c Unix Domain Socket(\uc774\ud558 UDS) \ub294 socket API\ub97c \uc218\uc815\uc5c6\uc774 \uc774\uc6a9\uba70, port \uae30\ubc18\uc758 Inernet Domain Socket\uc5d0 \ube44\ud574\uc11c \ub85c\uceec \uc2dc\uc2a4\ud15c\uc758 \ud30c\uc77c\uc2dc\uc2a4\ud15c\uc744 \uc774\uc6a9\ud574\uc11c \ub0b4\ubd80\ud504\ub85c\uc138\uc2a4\uac04\uc758 \ud1b5\uc2e0\uc744 \uc704\ud574 \uc0ac\uc6a9\ud55c\ub2e4\ub294 \uc810\uc774 \ub2e4\ub974\ub2e4\uace0 \ud560\uc218 \uc788\ub2e4. ls \ub97c \uc774\uc6a9\ud574\uc11c \ud1b5\uc2e0\uc744 \uc704\ud574\uc11c \ub9cc\ub4e4\uc5b4\uc9c4 \ud30c\uc77c\uc744 \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\uc740 \ubaa8\uc2b5\uc744 \ubcf4\uc778\ub2e4. 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