HTTPサーバーを作ってみる#20
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nodchip
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May 26, 2026
| int sfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | ||
| if (sfd < 0) { perror("socket"); return 1; } | ||
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| if (connect(sfd, res->ai_addr, res->ai_addrlen) < 0) { perror("connect"); return 1; } |
| if (rv != 0) { fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv)); return 1; } | ||
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| int sfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | ||
| if (sfd < 0) { perror("socket"); return 1; } |
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失敗した場合に res を freeaddrinfo() していない点が気になりました。関数の末尾に、リソースが確保されている場合は解放するコードを書き、途中で失敗した場合は、そこまで goto で飛ばす、という書き方を時々見かけます。賛否はあるものの、参考まで。
nodchip
reviewed
May 26, 2026
| ssize_t total = 0; | ||
| while (total < BUF_SIZE - 1) { | ||
| ssize_t n = read(fd, req + total, BUF_SIZE - 1 - total); | ||
| if (n < 0) { perror("read"); free(req); return; } |
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個人的には、生でメモリを確保し、解放する際は、解放したあとにポインターに NULL を代入します。理由は、悪意ある者が、メモリのダンプを覗いたとき、ポインターの値から、解放済みのメモリ領域を覗き、価値のあるデータを盗むのを防ぎたいためです。趣味の範囲かもしれません。
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CSZAP 4th 課題