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ryochack id:ryochack

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Linuxhack.jp Â» ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹ã¨ã¯ï¼Ÿ
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ryochack 2015/02/10
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Linux

process
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ãƒ—ãƒã‚»ã‚¹ã‚’forkã™ã‚‹ã¨ãã®ã“ã¨ - Hibariya
å¤å…ãƒ—ãƒã‚»ã‚¹ã¨ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹ã®é•ã„ãŒã†ã¾ãç†è§£ã§ãã¦ãªã‹ã£ãŸã‘ã©ã€ã‚ˆã†ã‚„ãé•ã„ã‚’ç¢ºèªã™ã‚‹ã“ã¨ãŒã§ããŸã€‚ å¤å…ãƒ—ãƒã‚»ã‚¹ å¤å…ãƒ—ãƒã‚»ã‚¹ã¯ã€è¦ªãƒ—ãƒã‚»ã‚¹ãŒwaitã›ãšã«å…ˆã«é€ã£ã¦ã—ã¾ã£ãŸå¾Œã‚‚èµ°ã‚Šç¶šã‘ã¦ã„ã‚‹åãƒ—ãƒã‚»ã‚¹ã€‚ Orphan Process ã¨ã‚‚å‘¼ã°ã‚Œã‚‹ã€‚ è¦ªã®ã„ãªããªã£ãŸåãƒ—ãƒã‚»ã‚¹ã¯initãƒ—ãƒã‚»ã‚¹ã®åï¼ˆå¤å…ï¼‰ã«ãªã‚‹ã€‚ è¦ªãƒ—ãƒã‚»ã‚¹ãŒæ»ã‚“ã§ã€åãƒ—ãƒã‚»ã‚¹ã®è¦ªãŒå¤‰åŒ–ã™ã‚‹æ§˜åã‚’è¦‹ã‚‹ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªã‚¹ã‚¯ãƒªãƒ—ãƒˆã‚’å®Ÿè¡Œã—ãŸã‚ã¨ã§ãƒ•ã‚¡ã‚¤ãƒ«ã‚’tailã™ã‚‹ã¨åˆ†ã‹ã‚Šã‚„ã™ãã†ã€‚ Process.fork do File.open('orphan', 'a') do |f| loop do sleep 1 # è¦ªãƒ—ãƒã‚»ã‚¹ã®pidã‚’ãƒ•ã‚¡ã‚¤ãƒ«ã«æ›¸ãå‡ºã™ f.puts Process.ppid f.flush end end end sleep 5 ã“ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’å®Ÿè¡Œã—ã¦ã€orphanã‚’tail -fã§è¦³å¯Ÿã—ã¦ã„ã‚‹ã¨ã€
ryochack 2015/02/10
double forkã«ã¤ã„ã¦

linux

process

fork
ãƒªãƒ³ã‚¯
forkã¨ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹
ã¨ã‚ã‚‹ã‚¢ãƒ—ãƒªã‹ã‚‰å¤–éƒ¨ã‚³ãƒžãƒ³ãƒ‰ã‚’å®Ÿè¡Œã™ã‚‹æ©Ÿèƒ½ã‚’å®Ÿè£…ã—ã¦ã„ãŸã‚“ã ã‘ã©ã€ãµã¨æ°—ãŒã¤ã„ãŸã‚‰ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹ãŒå¤§é‡ã«ã§ãã¦ã„ã¦ç„¦ã£ãŸã€‚ ã¨ã‚ã‚‹ã‚¢ãƒ—ãƒªã¯ãƒ‡ãƒ¼ãƒ¢ãƒ³ãƒ—ãƒã‚»ã‚¹ã§ãšã£ã¨ç”Ÿãã¦ã„ã‚‹ å¤–éƒ¨ã‚³ãƒžãƒ³ãƒ‰ã¯çµ‚äº†ã‚’å¾…ãŸãªãã¦ã„ã„ã—å‡ºåŠ›ã‚‚å–ã‚‰ãªãã¦ã„ã„ ã‚¾ãƒ³ãƒ“ãŒã§ãã¡ã‚ƒã†ãƒ€ãƒ¡ãªå®Ÿè£… ã¨ã«ã‹ãå®Ÿè¡Œã™ã‚Œã°ã„ã„ã£ã¦ã“ã¨ã§å˜ç´”ã«æ¬¡ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã‚’æ›¸ã„ã¦ã„ãŸã€‚ forkã—ã¦execã™ã‚‹ã ã‘ã¨ã„ã†è‡³ã£ã¦å˜ç´”ãªå®Ÿè£…ï¼ˆå®Ÿéš›ã«ã¯STDOUTã‚’/dev/nullã«å‘ã‘ã‚‹ã¨ã‹è‰²ã€…ã‚ã‚‹ã‘ã©ï¼‰ã€‚ # å¤–éƒ¨ã‚³ãƒžãƒ³ãƒ‰ã‚’å®Ÿè¡Œã™ã‚‹ # ã‚³ãƒžãƒ³ãƒ‰ã®å‡ºåŠ›ã¨ã‹çµ‚äº†ã«ã¯èˆˆå‘³ãŒãªã„ def run_command(command) fork do puts "child: pid=#{Process.pid}, ppid=#{Process.ppid}" exec(command) end end puts "app: pid=#{Process.pid
ryochack 2015/02/10
"åãƒ—ãƒã‚»ã‚¹ã‚’ç”Ÿæˆã—ãŸå¾Œã¯waitã§ãã®çµ‚äº†ã‚’å¾…ã£ã¦çµ‚äº†ã‚¹ãƒ†ãƒ¼ã‚¿ã‚¹ã‚’å¾—ã‚‹ã®ã ãŒã€é€†ã«è¨€ã†ã¨waitã‚’å‘¼ã¶ã¾ã§ã¯ãŸã¨ãˆåãƒ—ãƒã‚»ã‚¹ãŒçµ‚äº†ã—ã¦ã„ã¦ã‚‚çµ‚äº†ã‚¹ãƒ†ãƒ¼ã‚¿ã‚¹ã‚’ä¿æŒã—ã¦ãŠã‹ãªã‘ã‚Œã°ãªã‚‰ãªã„ã€‚"

linux

process

fork
ãƒªãƒ³ã‚¯
forkã¨waitã¨ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹ - ãƒ•ã‚¡ã‚¤ãƒ¤ãƒ¼ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆ
forkã¯ãƒ—ãƒã‚»ã‚¹ã®ã‚³ãƒ”ãƒ¼ã‚’ä½œæˆã™ã‚‹.ãã—ã¦waitã§å¾…ã¤.å‡¦ç†ã®æµã‚ŒãŒä¸€æœ¬ã‹ã‚‰è¤‡æ•°ã«åˆ†ã‹ã‚Œã‚‹æ§˜ãŒãƒ•ã‚©ãƒ¼ã‚¯ã¿ãŸã„ã ã‹ã‚‰forkãªã®ã ã‚ã†ã‹. forkã§ä½•ãŒã‚³ãƒ”ãƒ¼ã•ã‚Œã‚‹ã®ã‹ forkã®ã‚µãƒ³ãƒ—ãƒ« wait waitã®ã‚µãƒ³ãƒ—ãƒ« ã‚¾ãƒ³ãƒ“ãƒ—ãƒã‚»ã‚¹ã«ã¤ã„ã¦ forkã§ä½•ãŒã‚³ãƒ”ãƒ¼ã•ã‚Œã‚‹ã®ã‹forkã¯ãã‚Œã‚’å®Ÿè¡Œã—ãŸãƒ—ãƒã‚»ã‚¹ã®åãƒ—ãƒã‚»ã‚¹ã‚’ä½œæˆã™ã‚‹.åãƒ—ãƒã‚»ã‚¹ã¯è¦ªãƒ—ãƒã‚»ã‚¹ã®ã‚³ãƒ”ãƒ¼ã§ã‚ã‚‹.ãƒ—ãƒã‚»ã‚¹ã‚’ã©ã“ã¾ã§å®Ÿè¡Œã—ãŸã‹(ãƒ—ãƒã‚°ãƒ©ãƒ ã‚«ã‚¦ãƒ³ã‚¿?)ã‚‚ã‚³ãƒ”ãƒ¼ã•ã‚Œã‚‹ã®ã§,åãƒ—ãƒã‚»ã‚¹ã¯forkã®è¿”ã‚Šå€¤ãŒè¿”ã‚‹ã¨ã“ã‚ã‹ã‚‰å®Ÿè¡Œã•ã‚Œã‚‹(ã¨,æ€ã†).ã‚ã¨,ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ãªã©ã‚‚ã‚ªãƒ¼ãƒ—ãƒ³ã•ã‚Œã¦ã„ã‚Œã°ãã®ã¾ã¾ã‚³ãƒ”ãƒ¼ã•ã‚Œã‚‹.ã‚³ãƒ”ãƒ¼ã•ã‚Œãªã„ã®ã¯pidã‚„ppidã¨ãƒ•ã‚¡ã‚¤ãƒ«ãƒãƒƒã‚¯ã‚„ã‚µã‚¹ãƒšãƒ³ãƒ‰ä¸ã®ã‚·ã‚°ãƒŠãƒ«ãã‚‰ã„ã ã‚ã†ã‹.ãã—ã¦,ãã®forkã®è¿”ã‚Šå€¤ã«ã‚ˆã£ã¦,ãƒ—ãƒã‚»ã‚¹ã¯è‡ªåˆ†ãŒè¦ªãƒ—ãƒã‚»ã‚¹ã‹åãƒ—ãƒã‚»ã‚¹ã‹ã‚’çŸ¥ã‚‹ã“ã¨ãŒã§ãã‚‹. æˆåŠŸã™ã‚Œã°åãƒ—ãƒã‚»ã‚¹ã«
ryochack 2015/02/10
linux

process

fork
ãƒªãƒ³ã‚¯
QNX - Wikipedia
QNXï¼ˆã‚ãƒ¥ãƒ¼ã‚¨ãƒŒã‚¨ãƒƒã‚¯ã‚¹ã€ã¾ãŸã¯ã‚ãƒ¥ãƒ¼ãƒ‹ãƒƒã‚¯ã‚¹ã¨ç™ºéŸ³ï¼‰ã¯å•†ç”¨ã®ãƒªã‚¢ãƒ«ã‚¿ã‚¤ãƒ Unixç³»ã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã§ã‚ã‚Šã€POSIXã¨POSIX 1003.1bã«å¯¾å¿œã—ã¦ã„ã‚‹ã€‚ä¸»ã«çµ„ã¿è¾¼ã¿ã‚·ã‚¹ãƒ†ãƒ å‘ã‘ã«è²©å£²ã•ã‚Œã¦ã„ã‚‹ã€‚å…ƒã€…ã¯ã‚«ãƒŠãƒ€ã®ä¼æ¥QNXã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã‚·ã‚¹ãƒ†ãƒ ã‚ºãŒé–‹ç™ºã—ã¦ã„ãŸãŒã€åŒç¤¾ã¯å¾Œã«ãƒªã‚µãƒ¼ãƒãƒ»ã‚¤ãƒ³ãƒ»ãƒ¢ãƒ¼ã‚·ãƒ§ãƒ³ï¼ˆç¾ãƒ–ãƒ©ãƒƒã‚¯ãƒ™ãƒªãƒ¼ï¼‰ãŒå–å¾—ã—ãŸã€‚ ãƒžã‚¤ã‚¯ãƒã‚«ãƒ¼ãƒãƒ«OSã¨ã—ã¦ã€QNXã§ã¯OSã®ã»ã¨ã‚“ã©ãŒã€Œã‚µãƒ¼ãƒã€ã¨å‘¼ã°ã‚Œã‚‹å°ã•ãªã‚¿ã‚¹ã‚¯ã¨ã—ã¦å‹•ä½œã™ã‚‹ã€‚ã“ã®ç‚¹ã¯å¾“æ¥ã‹ã‚‰ã®ãƒ¢ãƒŽãƒªã‚·ãƒƒã‚¯ãªã‚«ãƒ¼ãƒãƒ«ã‚’æŽ¡ç”¨ã—ãŸOSã¨å¤§ããç•°ãªã‚‹ã€‚ãƒ¢ãƒŽãƒªã‚·ãƒƒã‚¯ã‚«ãƒ¼ãƒãƒ«OSã§ã¯æ©Ÿèƒ½ã®å¤§éƒ¨åˆ†ã¯ã²ã¨ã¤ã®å¤§ããªãƒ—ãƒã‚°ãƒ©ãƒ ã«å«ã¾ã‚Œã€ä¾‹ãˆã°ä¸è¦ãªæ©Ÿèƒ½ã‚’OFFã«ã—ãŸã„æ™‚ãªã©ã«ã¯OSè‡ªä½“ã‚’å¤‰æ›´ï¼ˆå†ãƒªãƒ³ã‚¯ãªã©ï¼‰ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã€‚ãã‚Œã«å¯¾ã—QNXã§ã¯ãƒ¦ãƒ¼ã‚¶ã‚„é–‹ç™ºè€…ã¯ã‚µãƒ¼ãƒã‚’åœæ¢ã•ã›ã‚‹ã“ã¨ã§ç°¡å˜ã«ä¸è¦ãªæ©Ÿèƒ½ã‚’OFFã«ã™ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ QNXã®ã‚·
ryochack 2014/07/24
QNXã®ãƒ—ãƒã‚»ã‚¹é–“é€šä¿¡ã¯ã€å—ä¿¡ãƒ—ãƒã‚»ã‚¹ãŒãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã‚’å¾…ã£ã¦ã„ãŸå ´åˆã€åŒæ™‚ã«å—ä¿¡å´ãƒ—ãƒã‚»ã‚¹ã«CPUã®åˆ¶å¾¡ãŒæ¸¡ã•ã‚Œã€ã“ã®éš›ã«ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ã‚’çµŒç”±ã—ãªã„ã€‚ãã®ãŸã‚ã€å…¨ãç„¡é§„ãªç‚¹ãŒãªã„ã€‚

OS

IPC

RTOS

process
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ryochack 2013/10/13
process

thread

OS
ãƒªãƒ³ã‚¯
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