UNIX Syscalls
LinuxLinux syscalls are defined in include/linux/syscalls.h. Syscalls use the same parameter order across platforms, but some (e.g. sys_stat64) are only defined on some platforms, and others (e.g. sys_clone) have different parameters depending on kernel compilation options. Syscall numbers are platform-dependent. Manpage syscalls(2) lists syscalls and which kernel version they were added in. Manpa
Tutorial - Write a System Call • Stephen Brennan
Stephen Brennan • 14 November 2016 A while back, I wrote about writing a shell in C, a task which lets you peek under the covers of a tool you use daily. Underneath even a simple shell are many operating system calls, like read, fork, exec, wait, write, and chdir (to name a few). Now, it’s time to continue this journey down another level, and learn just how these system calls are implemented in Li
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興味ãŒã‚ã£ã¦èª¿ã¹ã¦ã„ãŸã‚‰ã€å°‘ã—ã ã‘分ã‹ã£ãŸã®ã§ã¾ã¨ã‚ã¦ãŠãã¾ã™ã€‚当然間é•ã£ãŸç®‡æ‰€ã‚‚ã‚ã‚‹ã€ã‚ã¨è€ƒæ…®ãŒæ¼ã‚Œã¦ã„る箇所もã‚ã‚‹ã‹ã¨æ€ã„ã¾ã™ã®ã§ãƒ„ッコミをãŠé¡˜ã„ã—ã¾ã™â€¦ ptrace(2) システムコール strace ã®æ ¸ã¨ãªã‚‹ã‚·ã‚¹ãƒ†ãƒ コール㯠ptrace(2) ã§ã‚る。ptrace(2)を用ã„ã‚‹ã“ã¨ã§ã€ã‚るプãƒã‚»ã‚¹ã‚’別ã®ãƒ—ãƒã‚»ã‚¹ã‹ã‚‰ç›£è¦–ã—ã€ã‚·ã‚°ãƒŠãƒ«ã”ã¨ã«åœæ¢ã—ã¦ãƒ¬ã‚¸ã‚¹ã‚¿ã‚„メモリã®çŠ¶æ…‹ã‚’観察ã—ãŸã‚Šå¤‰æ›´ã—ãŸã‚Šã§ãる。gdbã®ã‚ˆã†ãªãƒ‡ãƒãƒƒã‚¬ã®ãƒ–レークãƒã‚¤ãƒ³ãƒˆã€ã‚ã‚‹ã„ã¯ã¾ã•ã«straceã®ã‚ˆã†ãªç›®çš„ã§åˆ©ç”¨ã•ã‚Œã‚‹ã€‚ 大ã¾ã‹ãªåˆ©ç”¨æ–¹æ³•ã¨ã—ã¦ã¯ã€è¦ªãƒ—ãƒã‚»ã‚¹ã® ptrace(PTRACE_ATTACH, pid, ...) （ã¾ãŸã¯åプãƒã‚»ã‚¹ã® ptrace(PTRACE_TRACEME, 0...)）ã«ã‚ˆã‚Šãƒˆãƒ¬ãƒ¼ã‚¹ãŒé–‹å§‹ã—ã€wait()ãªã©ã§åœæ¢ã‚’å¾…ã£ã¦ã‹ã‚‰æ§˜ã€…ãªè¨å®šã‚’親ã‹ã‚‰é€ã‚Šã€ ptrace(PTRAC
Epoll is fundamentally broken 1/2 — Idea of the day
In previous articles we talked about: The history of the Select(2) syscall Select(2) being fundamentally broken This time we'll focus on Linux's select(2) successor - the epoll(2) I/O multiplexing syscall. Epoll is relatively young. It was created by Davide Libenzi in 2002. For comparison: Windows did IOCP in 1994 and FreeBSD's kqueue was introduced in July 2000. Unfortunately, even though epoll i
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ã—ã°ã‚‰ãå‰ã«ç§ã¯ã€ã€Œ C言語ã§ã‚·ã‚§ãƒ«ã‚’書ã方法 ã€ã¨ã„ã†ã‚¿ã‚¤ãƒˆãƒ«ã§ã€çš†ã•ã‚“ãŒæ—¥å¸¸çš„ã«ä½¿ã£ã¦ã„るツールã®å†…部動作をç†è§£ã™ã‚‹ã®ã«å½¹ç«‹ã¤ãƒãƒ¥ãƒ¼ãƒˆãƒªã‚¢ãƒ«ã‚’書ãã¾ã—ãŸã€‚å˜ç´”ãªã‚·ã‚§ãƒ«ã§ã‚ã£ã¦ã‚‚ã€æ•°ä¾‹ã‚’挙ã’ã‚‹ã ã‘ã§ã‚‚ read 〠fork 〠exec 〠wait 〠write ãã‚Œã‹ã‚‰ chdir ãªã©å¤šæ•°ã®ã‚·ã‚¹ãƒ†ãƒ コールãŒå‘¼ã³å‡ºã•ã‚Œã¦ã„ã¾ã—ãŸã€‚ã“ã®æŽ¢ç´¢ã«ç¶šã次ãªã‚‹æ—…ã¨ã—ã¦ã€ä»Šå›žã¯Linux環境ã«ãŠã„ã¦ã‚·ã‚¹ãƒ†ãƒ コールãŒã©ã®ã‚ˆã†ã«å®Ÿè£…ã•ã‚Œã¦ã„ã‚‹ã®ã‹ã«ã¤ã„ã¦å¦ã‚“ã§ã„ãã¾ã—ょã†ã€‚ システムコールã¨ã¯ä½•ã‹ システムコールを実装ã™ã‚‹ã«å½“ãŸã£ã¦ã€ãã‚ŒãŒä½•ãªã®ã‹ã‚’ã¾ãšãã¡ã‚“ã¨ç†è§£ã—ã¦ãŠãã¾ã—ょã†ã€‚ãã†é ããªã„昔ã®ç§ãŒãã†ã§ã—ãŸãŒã€ç´ ç›´ãªãƒ—ãƒã‚°ãƒ©ãƒžãªã‚‰ã‚·ã‚¹ãƒ†ãƒ コールをCライブラリã§æä¾›ã•ã‚Œã¦ã„る関数ã®ã“ã¨ã ã¨å®šç¾©ã™ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“。ã—ã‹ã—ã“ã‚Œã¯å…¨ãæ£ã—ãã‚ã‚Šã¾ã›ã‚“。確ã‹ã«Cライブラリã«å«ã¾ã‚Œã‚‹é–¢æ•°ç¾¤ã¯ã‚·ã‚¹ãƒ†ãƒ コ
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GitHub - dyjakan/osx-syscalls-list: Fish for BSD system calls and MACH traps inside of XNU ✌ï¸
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