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[Seobeo] Updated seobeo so that API is more opinionated. Added my webpage./build.sh
author June Park <parkjune1995@gmail.com>
date Mon, 29 Sep 2025 16:00:44 -0700
parents 5695ef413be0
children
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5695ef413be0 Initialized mono repo with bazels with few examples.
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1 /*
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2 ** server.c -- a stream socket server demo
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <unistd.h>
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8 #include <errno.h>
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9 #include <string.h>
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10 #include <sys/types.h>
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11 #include <sys/socket.h>
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12 #include <netinet/in.h>
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13 #include <netdb.h>
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14 #include <arpa/inet.h>
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15 #include <sys/wait.h>
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16 #include <signal.h>
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17
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18 #define PORT "3490" // the port users will be connecting to
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19
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20 #define BACKLOG 10 // how many pending connections queue will hold
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21
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22 void sigchld_handler(int s)
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23 {
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24 (void)s; // quiet unused variable warning
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25
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26 // waitpid() might overwrite errno, so we save and restore it:
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27 int saved_errno = errno;
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28
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29 while(waitpid(-1, NULL, WNOHANG) > 0);
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30
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31 errno = saved_errno;
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32 }
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33
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34
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35 // get sockaddr, IPv4 or IPv6:
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36 void *get_in_addr(struct sockaddr *sa)
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37 {
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38 if (sa->sa_family == AF_INET) {
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39 return &(((struct sockaddr_in*)sa)->sin_addr);
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40 }
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41
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42 return &(((struct sockaddr_in6*)sa)->sin6_addr);
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43 }
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44
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45 int main(void)
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46 {
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47 // listen on sock_fd, new connection on new_fd
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48 int sockfd, new_fd;
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49 struct addrinfo hints, *servinfo, *p;
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50 struct sockaddr_storage their_addr; // connector's address info
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51 socklen_t sin_size;
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52 struct sigaction sa;
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53 int yes=1;
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54 char s[INET6_ADDRSTRLEN];
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55 int rv;
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56
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57 memset(&hints, 0, sizeof hints);
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58 hints.ai_family = AF_INET;
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59 hints.ai_socktype = SOCK_STREAM;
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60 hints.ai_flags = AI_PASSIVE; // use my IP
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61
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62 if ((rv = getaddrinfo(NULL, PORT, &hints, &servinfo)) != 0) {
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63 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
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64 return 1;
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65 }
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66
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67 // loop through all the results and bind to the first we can
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68 for(p = servinfo; p != NULL; p = p->ai_next) {
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69 if ((sockfd = socket(p->ai_family, p->ai_socktype,
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70 p->ai_protocol)) == -1) {
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71 perror("server: socket");
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72 continue;
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73 }
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74
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75 if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,
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76 sizeof(int)) == -1) {
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77 perror("setsockopt");
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78 exit(1);
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79 }
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80
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81 if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
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82 close(sockfd);
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83 perror("server: bind");
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84 continue;
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85 }
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86
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87 break;
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88 }
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89
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90 freeaddrinfo(servinfo); // all done with this structure
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91
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92 if (p == NULL) {
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93 fprintf(stderr, "server: failed to bind\n");
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94 exit(1);
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95 }
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96
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97 if (listen(sockfd, BACKLOG) == -1) {
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98 perror("listen");
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99 exit(1);
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100 }
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101
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102 sa.sa_handler = sigchld_handler; // reap all dead processes
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103 sigemptyset(&sa.sa_mask);
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104 sa.sa_flags = SA_RESTART;
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105 if (sigaction(SIGCHLD, &sa, NULL) == -1) {
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106 perror("sigaction");
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107 exit(1);
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108 }
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109
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110 printf("server: waiting for connections...\n");
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111
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112 while(1) { // main accept() loop
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113 sin_size = sizeof their_addr;
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114 new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
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115 &sin_size);
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116 if (new_fd == -1) {
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117 perror("accept");
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118 continue;
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119 }
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120
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121 inet_ntop(their_addr.ss_family,
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122 get_in_addr((struct sockaddr *)&their_addr),
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123 s, sizeof s);
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124 printf("server: got connection from %s\n", s);
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125
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126 char *yo = "HTTP/1.1 OK %s\r\n"
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127 "Content-Type: text/txt\r\n"
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128 "Content-Length: 13\r\n"
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129 "Connection: close\r\n"
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130 "\r\n"
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131 "Hello, world!";
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132
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133 if (!fork()) { // this is the child process
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134 close(sockfd); // child doesn't need the listener
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135 if (send(new_fd,
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136 "HTTP/1.1 OK %s\r\n"
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137 "Content-Type: text/txt\r\n"
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138 "Content-Length: 13\r\n"
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139 "Connection: close\r\n"
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140 "\r\n"
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141 "Hello, world!"
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142 , strlen(yo), 0) == -1)
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143 perror("send");
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144 close(new_fd);
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145 exit(0);
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146 }
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147 close(new_fd); // parent doesn't need this
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148 }
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149
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150 return 0;
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151 }