接前面，繼續分析：?putenv("TZ=GMT") 設置了時區信息。

find_other_exec(argv[0], "postgres", PG_BACKEND_VERSIONSTR, backend_exec))

就是要找到同目錄下、同版本的postgres備用。initdb 執行后期，很多事情要依賴 postgres來處理的。

/** Also ensure that TZ is set, so that we don't waste time identifying the* system timezone each of the many times we start a standalone backend.* It's okay to use a hard-wired value here because nothing done during* initdb cares about the timezone setting.*/putenv("TZ=GMT");if ((ret = find_other_exec(argv[0], "postgres", PG_BACKEND_VERSIONSTR,backend_exec)) < 0){char full_path[MAXPGPATH];if (find_my_exec(argv[0], full_path) < 0)strlcpy(full_path, progname, sizeof(full_path));if (ret == -1)fprintf(stderr,_("The program \"postgres\" is needed by %s ""but was not found in the\n""same directory as \"%s\".\n""Check your installation.\n"),progname, full_path);elsefprintf(stderr,_("The program \"postgres\" was found by \"%s\"\n""but was not the same version as %s.\n""Check your installation.\n"),full_path, progname);exit(1);}

接下來，獲得路徑：

一個是 bin_path： ? ? ?就是initdb執行的路徑。我運行的結果是： /home/pgsql/project/bin

一個是 share_path： ?就是一些共享用信息的路徑。我運行的結果是： /home/pgsql/project/share

/* store binary directory */strcpy(bin_path, backend_exec);*last_dir_separator(bin_path) = '\0';canonicalize_path(bin_path);fprintf(stderr,"bin_path is: %s \n",bin_path);if (!share_path){share_path = pg_malloc(MAXPGPATH);get_share_path(backend_exec, share_path);}else if (!is_absolute_path(share_path)){fprintf(stderr, _("%s: input file location must be an absolute path\n"), progname);exit(1);}canonicalize_path(share_path);fprintf(stderr,"share_path is: %s \n",share_path);





本文轉自健哥的數據花園博客園博客，原文鏈接：http://www.cnblogs.com/gaojian/p/3174020.html，如需轉載請自行聯系原作者

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