linux io

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https://www.jianshu.com/p/a9d39ddc9cbb?u_atoken=185d4fe4-b89b-4432-bb19-9497e6d21b11&u_asession=01_9-lOYk-tSe2-3fSQKaw9ZHiZIPv5YxfrBzq2MtOgOYqOLwCLtd__sDvl7Qjkak4X0KNBwm7Lovlpxjd_P_q4JsKWYrT3W_NKPr8w6oU7K_DE9YPwYvAwTalv4Nz_GL061cRpK6RrRpbRcNX0dn1LmBkFo3NEHBv0PZUm6pbxQU&u_asig=05cyib6BOG8D9V4r7YUMQ1OBeHEuUX6mPXbmjJX-ILsZpS93sdcngWrS2B_qG1jeLwiEDAnYbgrf5tXCfop5PHgXTkc4ZZV38Id63RbkTWTpvZ_I-X_2j1ALBb90lWJYa6NVO8LP30IuUXOP1ocPZjHLXn43GXBsGKfXURk4pkO9L9JS7q8ZD7Xtz2Ly-b0kmuyAKRFSVJkkdwVUnyHAIJzXZ0gFSpVXV0sPLwOipFI8j9zwzV0oeyd9SvgArv4md4FkLEP8FFBW9mXuUlqJJ5YO3h9VXwMyh6PgyDIVSG1W_bwO8-HuuwJrqWJTiJcd6ZjuZXcjltmzQ68zJCLh7e--_j_sbvSaLeb29WlvVENim0AQ6nHDB-MVYdPZML20vymWspDxyAEEo4kbsryBKb9Q&u_aref=xIh4shnujwgdqZafmJLjVQMfLIw%3D

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https://stackoverflow.com/questions/31229233/can-i-rely-on-linux-close-not-blocking-for-file-i-o

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https://www.linuxquestions.org/questions/linux-kernel-70/close-system-call-takes-long-time-to-finish-4175575001/

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https://stackoverflow.com/questions/4434223/non-blocking-write-to-file-in-c-c

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https://stackoverflow.com/questions/23865898/when-non-blocking-i-o-is-turned-on-for-stdout-is-it-correct-for-the-os-to-turn

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https://www.cnblogs.com/xiehongfeng100/p/4619451.html

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https://www.linuxtoday.com/blog/blocking-and-non-blocking-i-0/

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