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Annotation of OpenXM/src/ox_math/mysocket.c, Revision 1.3

1.1       ohara       1: /* -*- mode: C; coding: euc-japan -*- */
1.3     ! ohara       2: /* $OpenXM: OpenXM/src/ox_math/mysocket.c,v 1.2 1999/11/02 06:11:57 ohara Exp $ */
1.1       ohara       3: /*
                      4: setsockopt()してオプションを設定後,
                      5: socket, bind
                      6: するとローカルポートが割り当てられる。
                      7: その後, getsockname によってポート番号が求まる.
                      8: */
                      9:
                     10: #include <stdio.h>
                     11: #include <stdlib.h>
                     12: #include <unistd.h>
                     13: #include <errno.h>
                     14: #include <netdb.h>
                     15: #include <netinet/in.h>
                     16: #include <sys/types.h>
                     17: #include <sys/socket.h>
                     18: #include <fcntl.h>
                     19:
                     20: #if defined(__sun__)
                     21: #include <arpa/inet.h>
                     22: #endif
                     23:
                     24: #include "mysocket.h"
                     25:
                     26: static int getsocket(struct sockaddr_in *mp, char *host, short port)
                     27: {
                     28:     struct hostent *ent = gethostbyname(host);
                     29:
                     30:     memset(mp, '\0', sizeof(struct sockaddr_in));
                     31:     mp->sin_family = AF_INET;
                     32:     mp->sin_port = htons(port);
                     33:     memcpy((char *)&mp->sin_addr, ent->h_addr, ent->h_length);
                     34:
                     35:     return socket(AF_INET, SOCK_STREAM, 0);
                     36: }
                     37:
                     38: int mysocketAccept(int s_waiting)
                     39: {
                     40:     int val = accept(s_waiting, NULL, NULL);
                     41:     return val;
                     42: }
                     43:
                     44: int mysocketListen(char *hostname, short *portp)
                     45: {
                     46:     int option;
                     47:     int tmp;
                     48:     struct sockaddr_in me;
                     49:
                     50:     int s_waiting = getsocket(&me, hostname, *portp);
                     51:
                     52:     option = 1;
                     53:     setsockopt(s_waiting, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
                     54:
                     55:     if (bind(s_waiting, (struct sockaddr *)&me, sizeof(me)) < 0) {
                     56:         fprintf(stderr, "bind: failed.\n");
                     57:         exit(1);
                     58:     }
                     59:
                     60:     tmp = sizeof(me);
                     61:     if (getsockname(s_waiting, (struct sockaddr *)&me, &tmp) < 0) {
                     62:         fprintf(stderr, "getsockname is failed.\n");
                     63:         exit(1);
                     64:     }
                     65:
                     66:     *portp = ntohs(me.sin_port);
                     67:
                     68:     if (listen(s_waiting, 1) < 0) {
                     69:         fprintf(stderr, "listen: failed.\n");
                     70:         exit(1);
                     71:     }
                     72:
                     73:     return s_waiting;
                     74: }
                     75:
                     76: int mysocketOpen(char* hostname, short port)
                     77: {
                     78:     struct sockaddr_in serv;
                     79:     int s = getsocket(&serv, hostname, port);
                     80:
                     81:     fprintf(stderr, "get socket address for port number %d.\n", port);
                     82:     if (connect(s, (struct sockaddr *)&serv, sizeof(serv)) != 0) {
                     83:         fprintf(stderr, "connect: fail! socket = %d, errno = %d\n", s, errno);
                     84:         exit(-1);
                     85:     }
                     86:     return s;
                     87: }
                     88:
                     89: int mypipe(char *program, int fd1, int fd2)
                     90: {
                     91:     int sockfd[2];
                     92:     if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockfd) < 0) {
                     93:         fprintf(stderr, "socketpair: fail! errno = %d\n", errno);
                     94:     }
                     95:     if (fork() == 0) {
                     96:         /* 子プロセス */
                     97:         close(sockfd[0]);
                     98:         dup2(sockfd[1], fd1);
                     99:         dup2(sockfd[1], fd2);
                    100:         execl(program, program, NULL);
                    101:   }
                    102:   /* 親プロセス */
                    103:     close(sockfd[1]);
                    104:     return sockfd[0];
                    105: }