linux timer - JohnHau/mis GitHub Wiki
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https://man7.org/tlpi/code/online/dist/timers/real_timer.c.html
https://programming.vip/docs/linux-c-language-timer.html
https://riptutorial.com/posix/example/16306/posix-timer-with-sigev-thread-notification
https://linux.die.net/man/2/timer_create
https://stackoverflow.com/questions/12764771/timers-in-linux-in-c
https://0xax.gitbooks.io/linux-insides/content/Timers/linux-timers-4.html
https://qnaplus.com/implement-periodic-timer-linux/
https://embetronicx.com/tutorials/linux/device-drivers/using-kernel-timer-in-linux-device-driver/
https://www3.physnet.uni-hamburg.de/physnet/Tru64-Unix/HTML/APS33DTE/DOCU_007.HTM
https://unixcop.com/timer-command-linux/
https://2net.co.uk/tutorial/periodic_threads
https://www.tutorialspoint.com/unix_system_calls/getitimer.htm
https://certsimple.com/how-to-use-timer-in-linux-c/
https://opensource.com/article/21/10/linux-timers
https://www.teuniz.net/Timer_code/
https://linuxconfig.org/time-countdown-bash-script-example
https://docs.oracle.com/cd/E19455-01/806-4750/chap7rt-90/index.html
https://realpython.com/python-timer/
https://www.freedesktop.org/software/systemd/man/systemd.timer.html
https://www.geeksforgeeks.org/timer-c-using-system-calls/
https://fedoramagazine.org/systemd-timers-for-scheduling-tasks/
http://www.makelinux.net/ldd3/chp-7-sect-4.shtml
https://twpower.github.io/212-systemd-timer-example-en
https://installati.one/rockylinux/8/boost169-timer/
https://programmer.ink/think/linux-kernel-timer-experiment.html
https://www.engineersgarage.com/how-to-use-timer-in-raspberry-pi-part-20-38/
https://programming.vip/docs/linux-c-language-timer.html
https://github.com/torvalds/linux/blob/master/kernel/time/timer.c
https://github.com/perusio/linux-programming-by-example/blob/master/book/ch14/ch14-timers.c
https://wirelessr.gitbooks.io/working-life/content/linux_timer.html
https://certsimple.com/how-to-use-timer-in-linux-c/
https://www.udemy.com/course/wheeltimers/
https://www.linuxquestions.org/questions/programming-9/c-linux-timers-how-223855/
https://code-examples.net/en/q/66fdb5
https://linux.die.net/man/2/timer_create
https://blog.csdn.net/shenwanjiang111/article/details/52065361
https://www.nbccomedyplayground.com/how-to-use-timer-in-linux-c/
https://errorsfixing.com/linux-periodic-c-timers-without-using-signal-callback/
https://linuxhint.com/timer-function-cpp/
https://hackmd.io/@sysprog/linux-timer
https://developpaper.com/implementation-principle-and-usage-of-linux-c-c-timer/
http://openpowerlink.sourceforge.net/doc/2.0/2.0.1/de/d3d/timer-linuxuser_8c.html
https://courses.engr.illinois.edu/cs241/sp2009/ds/cs241-sp09-discussion6.pdf
https://www.gnu.org/software/libc/manual/html_node/Setting-an-Alarm.html
https://stackoverflow.com/questions/22071658/how-to-solve-the-linux-timer-signal-handler
http://manpages.ubuntu.com/manpages/focal/en/man2/timer_create.2.html
https://pubs.opengroup.org/onlinepubs/007904975/functions/timer_create.html
https://man7.org/linux/man-pages/man2/alarm.2.html
https://linux.die.net/man/3/alarm
https://linuxhint.com/sigalarm_alarm_c_language/
https://developpaper.com/an-example-of-alarm-function-in-linux/
https://www.tutorialspoint.com/unix_system_calls/alarm.htm
https://stackoverflow.com/questions/57881510/signals-using-alarm-in-linux-c
https://www.cs.princeton.edu/courses/archive/spring04/cos217/lectures/Signals.pdf
https://www.unix.com/unix-for-dummies-questions-and-answers/15008-alarm-signal.html
https://www.gnu.org/software/libc/manual/html_node/Alarm-Signals.html
https://en.linuxteaching.com/article/how_to_use_sigalrm_and_alarm_function_in_c_language
http://c.biancheng.net/cpp/html/334.html
https://pubs.opengroup.org/onlinepubs/7908799/xsh/alarm.html
https://quick-adviser.com/what-is-alarm-signal-in-linux/
https://www.ibm.com/docs/en/i/7.3?topic=ssw_ibm_i_73/apis/sigalarm.htm
https://dsa.cs.tsinghua.edu.cn/oj/static/unix_signal.html
https://u.cs.biu.ac.il/~linraz/os/OS3.pdf
https://flylib.com/books/en/2.552.1.272/1/
https://www.csl.mtu.edu/cs4411.ck/www/NOTES/signal/install.html
https://blog.fearcat.in/a?ID=00950-3aeb8afd-dda2-4059-ab9c-35a8bf69fd4d
https://www.engineersgarage.com/how-to-use-alarm-signal-in-raspberry-pi-part-19-38/
https://blog.csdn.net/sambian/article/details/698718
https://blog.fearcat.in/a?ID=00950-3aeb8afd-dda2-4059-ab9c-35a8bf69fd4d
https://www.engineersgarage.com/how-to-use-alarm-signal-in-raspberry-pi-part-19-38/
https://www.cxybb.com/article/u013015629/52557588
https://blog.actorsfit.com/a?ID=01100-66031be8-0d73-4382-96cd-5a6ce43a5c07
https://www.qnx.com/developers/docs/7.1/#com.qnx.doc.neutrino.lib_ref/topic/a/alarm.html
https://www.softprayog.in/tutorials/alarm-sleep-and-high-resolution-timers
https://support.sas.com/documentation/onlinedoc/ccompiler/doc700/html/lr1/zsigalrm.htm
https://gzipwtf.com/what-is-sigalrm-linux/
https://www.computerhope.com/unix/signals.htm
https://ofstack.com/Server/32013/example-of-alarm-function-in-linux.html
https://cloud.tencent.com/developer/article/1721404
http://faculty.cs.niu.edu/~hutchins/csci480/signals.htm
https://unixism.net/2021/02/making-signals-less-painful-under-linux/
https://www.linuxjournal.com/content/sigalrm-timers-and-stdin-analysis
https://iter01.com/314395.html
https://www.cnblogs.com/fnlingnzb-learner/p/5984844.html
https://www.programmersought.net/article/329180024.html
https://copyfuture.com/blogs-details/202204220127535671
https://unix.stackexchange.com/questions/156131/can-i-trap-a-clock-signal-in-my-bash-script
https://codeantenna.com/a/Ca2ID4JPeD
http://www.cplusplus.com/forum/general/223680/
https://blog.katastros.com/a?ID=01250-13e5e186-1ad0-4213-b0a2-4626ea8ce66b