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[Seobeo] Working on simple TCP server and client logic.
author June Park <parkjune1995@gmail.com>
date Wed, 24 Sep 2025 18:49:09 -0700
parents adcfad6e86fb
children 0b3b4f5887bb
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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 "seobeo/seobeo.h"
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6
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7 Dowa_PHashMap cache;
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8
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9 void SigchildHandler(int s)
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10 {
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11 (void)s; // quiet unused variable warning
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12
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13 // waitpid() might overwrite errno, so we save and restore it:
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14 int saved_errno = errno;
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15
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16 while(waitpid(-1, NULL, WNOHANG) > 0);
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17
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18 errno = saved_errno;
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19 }
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20
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21 void HandleClientRequest(int client_fd)
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22 {
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23 size_t idx = Dowa_HashMap_GetPosition(cache, "index.html");
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24 Dowa_PHashEntry entry = cache->entries[idx];
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25 if (!entry) {
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26 // 404 response if missing
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27 const char *not_found =
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28 "HTTP/1.1 404 Not Found\r\n"
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29 "Content-Length: 0\r\n"
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30 "Connection: close\r\n"
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31 "\r\n";
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32 send(client_fd, not_found, strlen(not_found), 0);
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33 close(client_fd);
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34 return;
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35 }
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36
3
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37 // 3) Prepare header with the correct content‐length
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38 size_t body_size = entry->capacity;
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39 const char *template =
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40 "HTTP/1.1 200 OK\r\n"
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41 "Content-Type: text/html\r\n"
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42 "Content-Length: %zu\r\n"
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43 "Connection: close\r\n"
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44 "\r\n";
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45
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46 // Compute how large the header is and allocate just enough space
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47 int header_len = snprintf(NULL, 0, template, body_size);
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48 char *header = malloc(header_len + 1);
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49 if (!header) {
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50 perror("malloc");
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51 close(client_fd);
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52 return;
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53 }
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54 snprintf(header, header_len + 1, template, body_size);
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55
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56 // 4) Send header
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57 send(client_fd, header, header_len, 0);
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58 free(header);
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59
3
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60 // 5) Stream the body in a loop until everything is sent
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61 ssize_t total_sent = 0;
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62 const char *body = entry->buffer;
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63 while ((size_t)total_sent < body_size)
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64 {
3
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65 ssize_t sent = send(
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66 client_fd,
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67 body + total_sent,
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68 body_size - total_sent,
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69 0
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70 );
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71 if (sent <= 0)
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72 {
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73 // error or connection closed by client
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74 break;
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75 }
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76 total_sent += sent;
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77 }
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78
3
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79 // 6) Tear down
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80 close(client_fd);
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81 }
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82
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83 int main(void)
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84 {
3
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85 cache = Dowa_HashMap_Create(1024);
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86 if (Dowa_Cache_Folder(cache, "seobeo/pages") != 0)
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87 {
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88 perror("Dowa_Cache_Folder");
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89 return -1;
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90 }
0
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91
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92 struct sigaction sa;
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93
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94 sa.sa_handler = SigchildHandler; // reap all dead processes
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95 sigemptyset(&sa.sa_mask);
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96 sa.sa_flags = SA_RESTART;
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97 if (sigaction(SIGCHLD, &sa, NULL) == -1) {
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98 perror("sigaction");
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99 exit(1);
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100 }
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101
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102 int sock_fd = Seobeo_CreateSocket(1, "6969", 10);
3
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103 Seobeo_ListenClient(sock_fd, &HandleClientRequest);
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104
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105 return 0;
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106 }
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107