{"id":126,"date":"2019-07-11T18:57:44","date_gmt":"2019-07-11T09:57:44","guid":{"rendered":"http:\/\/www.space4u.co.kr\/wp\/?p=126"},"modified":"2019-07-11T18:57:45","modified_gmt":"2019-07-11T09:57:45","slug":"fopen%ec%8b%9c%ec%97%90-o_direct%ec%99%80-o_sync%ec%9d%98-%ec%b0%a8%ec%9d%b4","status":"publish","type":"post","link":"http:\/\/www.space4u.co.kr\/wp\/?p=126","title":{"rendered":"fopen\uc2dc\uc5d0 O_DIRECT\uc640 O_SYNC\uc758 \ucc28\uc774"},"content":{"rendered":"\n<p>\n\nfopen \ud560\ub54c \uc635\uc158\uc73c\ub85c \uc8fc\ub294\ub370&#8230;<\/p>\n\n\n\n<p>O_DIRECT : \uce90\uc26c\ub97c \uac70\uce58\uc9c0 \uc54a\uace0 DMA\ub85c \ubc14\ub85c \ub370\uc774\ud130 \uc804\uc1a1\ud558\uace0 \ub9ac\ud134. \ub370\uc774\ud130\uac00 \ubaa8\ub450 \uc804\uc1a1\ub42c\ub294\uc9c0 \ubcf4\uc7a5\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n<p>O_SYNC : \ub370\uc774\ud130\uac00 \ubaa8\ub450 (\uce90\uc26c\ub85c) \uc804\uc1a1\ub42c\ub294\uc9c0 \ubcf4\uc7a5\ud558\uace0 \ub9ac\ud134. \uadf8\ub7ec\ub098 \uc544\uc9c1 (\ud558\ub4dc \ub514\uc2a4\ud06c \ub4f1 \ucd9c\ub825\uc7a5\uce58\uc5d0 \uae30\ub85d\ub418\uc9c0 \uc54a\uace0) \uce90\uc26c\uc5d0 \uc788\uc744 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n<p>O_DIRECT | O_SYNC : \uce90\uc26c\ub97c \uac70\uce58\uc9c0 \uc54a\uace0 DMA\ub85c \ubc14\ub85c \ub370\uc774\ud130 \uc804\uc1a1\ud558\uace0, \uc644\uc804\ud788 \uc804\uc1a1\uc774 \ub05d\ub0ac\uc744 \ub54c \ub9ac\ud134\ub41c\ub2e4. \uc644\uc804\ud558\uac8c \ub370\uc774\ud130\uac00 \ucd9c\ub825\uc7a5\uce58\uc5d0 \uae30\ub85d\ub418\ub294 \uac83\uc744 \ubcf4\uc7a5\ud55c\ub2e4.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>O_DIRECT | O_SYNC \ub97c \uc4f0\ub294 \uc774\uc720 : \uc784\ubca0\ub514\ub4dc\uc5d0\uc11c mmap\ub97c \uc774 \uc635\uc158\uc73c\ub85c \uc5f4\uc5b4\uc11c \ud558\ub4dc\uc6e8\uc5b4 \ud540(GPIO)\ub97c \uc81c\uc5b4\ud560\ub54c \uc4f0\uba74 \uc751\ub2f5\uc758 \uc2e0\ub8b0\uc131\uc744 \ub192\uc77c \uc218 \uc788\ub2e4. \uc774 \uc635\uc158 \uc5c6\uc774 0.001\ucd08 \uac04\uaca9\uc73c\ub85c \uc2e0\ud638\ub97c 10000000\ubc88 \uc8fc\uba74 \uce90\uc26c\uc5d0 \uc50c\uc5ec \uc788\ub2e4\uac00 \uc548\ub098\uac00\uac70\ub098&#8230; \ud2b9\uc815 \uc870\uac74\uc774 \ub418\uc11c \ud55c\ubc29\uc5d0 \ub098\uac00\uac70\ub098&#8230; \ub4f1\ub4f1 \uc5b4\uc774\uc5c6\ub294 \uc77c\uc774 \uc0dd\uae38 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n<p>DB\uac19\uc740\ub370\uc11c\ub294 \uc790\uae30\ub124\ub4e4\uc758 \uc54c\uace0\ub9ac\uc998\uc774 OS\ubcf4\ub2e4 \uc131\ub2a5\uc774 \uc88b\ub2e4\uace0 \uc694 \uc635\uc158\uc744 \uc368\uc11c \uc2a4\uc2a4\ub85c \uc81c\uc5b4\ud558\ub294 \uacbd\uc6b0\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n<p>\ucc38\uace0\ub9c1\ud06c :<br>http:\/\/stackoverflow.com\/questions\/5055859\/how-are-the-o-sync-and-o-direct-flags-in-open2-different-alike\n\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>fopen \ud560\ub54c \uc635\uc158\uc73c\ub85c \uc8fc\ub294\ub370&#8230; O_DIRECT : \uce90\uc26c\ub97c \uac70\uce58\uc9c0 \uc54a\uace0 DMA\ub85c \ubc14\ub85c \ub370\uc774\ud130 \uc804\uc1a1\ud558\uace0 \ub9ac\ud134. \ub370\uc774\ud130\uac00 \ubaa8\ub450 \uc804\uc1a1\ub42c\ub294\uc9c0 \ubcf4\uc7a5\ud558\uc9c0 \uc54a\ub294\ub2e4. O_SYNC : \ub370\uc774\ud130\uac00 \ubaa8\ub450 (\uce90\uc26c\ub85c) \uc804\uc1a1\ub42c\ub294\uc9c0&#8230;<\/p>\n<div class=\"more-link-wrapper\"><a class=\"more-link\" href=\"http:\/\/www.space4u.co.kr\/wp\/?p=126\">\ub354 \uc77d\uae30<span class=\"screen-reader-text\">fopen\uc2dc\uc5d0 O_DIRECT\uc640 O_SYNC\uc758 \ucc28\uc774<\/span> <i class=\"fas fa-angle-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[99,100,101],"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/posts\/126"}],"collection":[{"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=126"}],"version-history":[{"count":2,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/posts\/126\/revisions"}],"predecessor-version":[{"id":245,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=\/wp\/v2\/posts\/126\/revisions\/245"}],"wp:attachment":[{"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=126"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.space4u.co.kr\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}