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initial commit - bsleep - Unnamed repository; edit this file 'description' to name the repository.
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
DIR commit a3d47929ad00f036aabe8bd131d65f612260861d
HTML Author: kroovy <me@kroovy.de>
Date: Sun, 30 Jun 2024 18:49:18 +0200
initial commit
Diffstat:
A .gitignore | 2 ++
A LICENSE | 15 +++++++++++++++
A Makefile | 16 ++++++++++++++++
A README | 19 +++++++++++++++++++
A bsleep.c | 35 +++++++++++++++++++++++++++++++
5 files changed, 87 insertions(+), 0 deletions(-)
---
DIR diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,2 @@
+gopherproxy
+*.o
DIR diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,15 @@
+ISC License
+
+Copyright (c) 2024 kroovy <me@kroovy.de>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
DIR diff --git a/Makefile b/Makefile
@@ -0,0 +1,16 @@
+.POSIX:
+
+BIN = bsleep
+OBJ = $(BIN:=.o)
+
+LDFLAGS += -static -Wall -Wextra -pedantic
+
+all: $(BIN)
+
+$(BIN): $(OBJ)
+ $(CC) $(OBJ) $(LDFLAGS) -o $@
+
+$(OBJ): Makefile
+
+clean:
+ rm -f $(BIN) $(OBJ)
DIR diff --git a/README b/README
@@ -0,0 +1,19 @@
+bsleep
+
+Breakable sleep. 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'.
+
+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.
+
+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 diff --git a/bsleep.c b/bsleep.c
@@ -0,0 +1,35 @@
+#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;
+}