(DIR) <- Back bsleep - Breakable sleep in C ============================= A couple of days ago I stumbled upon an improvised breakable sleep. I wrote about in another post: (DIR) 2024-06-25 - bsleep (bashism) Since I generally strife to get independant from the use of bashisms, I decided to rewrite bsleep in C. And here we go... Breakable sleep in C. The button 'b' breaks the sleep. This can be used to chain two tasks on the commandline, with the second task only waiting for you to press 'b'. git clone git://kroovy.de/bsleep Build dependencies - C compiler - libc This program is meant to help people complete tasks on the commandline. Also the source code can be studied as a simple approach to forking a process in C. #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> int main(void) { int i,in,pid; pid = fork(); if (pid == 0) { /* child */ for (i=1;;i++) { printf("%d ", i); fflush(stdout); /* comment out if you prefer silent */ sleep(1); } return 0; } else if (pid > 0) { /* parent */ system ("/bin/stty raw"); while ((in = getchar()) != 'b') { printf("%c ", in); } system ("/bin/stty cooked"); printf("\n"); kill(pid, SIGKILL); /* kill child */ return 0; } else { return -1; } return 0; } (HTM) asciinema Footnote: The invocation of the operating system command "/bin/stty" via system() is not the most elegant. At the moment this needed to read the character without the need to press Enter. If possible I will try to replace the call system("/bin/stty ...") in the future. (DIR) 2024-06-30 - bsleep (rewritten in C)