diff options
author | Tom Ryder <tom@sanctum.geek.nz> | 2021-08-01 01:53:24 +1200 |
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committer | Tom Ryder <tom@sanctum.geek.nz> | 2021-08-01 01:53:24 +1200 |
commit | a6f9eb8eb2e48e0f6b89539b065a5932afac7aba (patch) | |
tree | 970a16efd294a03f44576732569e9ab01add6f79 | |
parent | Merge branch 'release/v1.0.0' (diff) | |
parent | Add a basic install recipe (diff) | |
download | doomsh-a6f9eb8eb2e48e0f6b89539b065a5932afac7aba.tar.gz doomsh-a6f9eb8eb2e48e0f6b89539b065a5932afac7aba.zip |
Merge branch 'release/v2.0.0'v2.0.0
* release/v2.0.0:
Add a basic install recipe
Use tabs for indentation
Pare down Makefile for tests
Relicense to GPLv3+
Adjust wording in README.md
Update clone URL in README.md
Apply shebang for doomsh with make recipe
Make paths to ignored files absolute
-rw-r--r-- | .gitignore | 9 | ||||
-rw-r--r-- | COPYING | 674 | ||||
-rw-r--r-- | LICENSE.md | 22 | ||||
-rw-r--r-- | Makefile | 16 | ||||
-rw-r--r-- | README.md | 18 | ||||
-rw-r--r-- | VERSION | 2 | ||||
-rw-r--r--[-rwxr-xr-x] | doomsh.bash (renamed from doomsh) | 120 | ||||
-rw-r--r-- | tests/Makefile | 10 | ||||
-rw-r--r-- | tests/files.c | 36 | ||||
-rw-r--r-- | tests/mem.c | 36 | ||||
-rw-r--r-- | tests/stack.c | 28 | ||||
-rw-r--r-- | tests/write.c | 50 |
12 files changed, 883 insertions, 138 deletions
@@ -1,4 +1,5 @@ -tests/files -tests/mem -tests/stack -tests/write +/doomsh +/tests/files +/tests/mem +/tests/stack +/tests/write @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + <program> Copyright (C) <year> <name of author> + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<https://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<https://www.gnu.org/licenses/why-not-lgpl.html>. diff --git a/LICENSE.md b/LICENSE.md deleted file mode 100644 index 5c2e0fe..0000000 --- a/LICENSE.md +++ /dev/null @@ -1,22 +0,0 @@ -MIT License -=========== - -Copyright (c) 2016 Tom Ryder - -Permission is hereby granted, free of charge, to any person obtaining a copy of -this software and associated documentation files (the "Software"), to deal in -the Software without restriction, including without limitation the rights to -use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies -of the Software, and to permit persons to whom the Software is furnished to do -so, subject to the following conditions: - -The above copyright notice and this permission notice shall be included in all -copies or substantial portions of the Software. - -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..4a13472 --- /dev/null +++ b/Makefile @@ -0,0 +1,16 @@ +.PHONY: all install clean +.SUFFIXES: +.SUFFIXES: .bash +ALL = doomsh +BASH = /bin/bash +PREFIX = /usr/local +all: $(ALL) +.bash: + $(BASH) -c : + awk -v interpreter=$(BASH) 'NR == 1 { $$1 ="#!" interpreter } 1' $< > $@ + chmod +x ./$@ +install: + mkdir -p -- $(PREFIX)/bin + cp -- doomsh $(PREFIX)/bin +clean: + rm -f -- $(ALL) @@ -9,26 +9,24 @@ don't end up munging important files in your `HOME`. $ sudo useradd -m doomguy $ sudo -i -u doomguy - $ git clone https://sanctum.geek.nz/code/doomsh.git + $ git clone https://dev.sanctum.geek.nz/code/doomsh.git $ cd doomsh $ ./doomsh -Not really important or useful in any way, but kind of fun to see what breaks -when resources are really tight, especially when it exposes problems in -programs like failing to check for NULL returns from `malloc(3)`. +This software is not really important or useful in any way, but it's kind of +fun to see what breaks when resources are really tight, especially when it +exposes problems in programs like failing to check for `NULL` returns from +`malloc(3)`. On the author's machine, at level 5, even `ls(1)` doesn't work, let alone Vim. If you're really crazy, you'll try and launch X11 processes from it, and watch them twitch as they die. -READ THE LICENSE. THE AUTHOR WAIVES ALL RESPONSIBILITY FOR ANYTHING THIS DOES -TO YOUR COMPUTER, YOUR DATA, OR YOUR DOG. - License ------- -Copyright (c) [Tom Ryder][1]. Distributed under an [MIT License][2]. +Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> -[1]: https://sanctum.geek.nz/ -[2]: https://www.opensource.org/licenses/MIT +Distributed under GNU General Public License version 3 or any later version. +Please see `COPYING`. @@ -1 +1 @@ -1.0.0 +2.0.0 @@ -1,29 +1,39 @@ -#!/usr/bin/env bash - +#!bash # -# doomsh: Play with low ulimits in Bash +# Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> +# +# This file is part of doomsh. # -# Author: Tom Ryder -# Copyright: 2016 -# License: MIT (see LICENSE.markdown) +# doomsh is free software: you can redistribute it and/or modify it under the +# terms of the GNU General Public License as published by the Free Software +# Foundation, either version 3 of the License, or (at your option) any later +# version. # +# doomsh is distributed in the hope that it will be useful, but WITHOUT ANY +# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR +# A PARTICULAR PURPOSE. See the GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along with +# doomsh. If not, see <https://www.gnu.org/licenses/>. + +# doomsh: Play with low ulimits in Bash self=doomsh # Don't try to play doomsh if already playing doomsh if [[ $DOOMSH ]] ; then - printf '%s: Already playing doomsh!\n' \ - "$self" >&2 - exit 2 + printf '%s: Already playing doomsh!\n' \ + "$self" >&2 + exit 2 fi # Show the coloured logo; thanks to Frans P. de Vries for the classic ASCII art # <http://www.gamers.org/~fpv/doombann.html> printf >&2 %s "$( { - tput AF 3 || tput setaf 3 - tput md || tput bold + tput AF 3 || tput setaf 3 + tput md || tput bold } 2>/dev/null )" while IFS= read -r line ; do - printf >&2 '%s\n' "$line" + printf >&2 '%s\n' "$line" done <<EOF ______ _____ _____ __ ___ | __ \ _ | _ | \ / | @@ -31,10 +41,10 @@ ______ _____ _____ __ ___ | | / | \_/ | \_/ | |\ /| | | |/ / \ / \ /| | V | | | ' / \_/ \_/ \_| | | -|__/ \_| +|__/ \_| EOF printf >&2 %s "$( { - tput me || tput sgr0 + tput me || tput sgr0 } 2>/dev/null )" # Need to figure out a skill level @@ -42,14 +52,14 @@ declare -i skill # If we have an argument, that must be the skill level if (($#)) ; then - skill=$1 - shift + skill=$1 + shift # Otherwise, we'll give the user a menu to choose from else - while IFS= read -r line ; do - printf >&2 '%s\n' "$line" - done <<EOF + while IFS= read -r line ; do + printf >&2 '%s\n' "$line" + done <<EOF 1. I'm too young to die 2. Hey, not too rough @@ -58,41 +68,41 @@ else 5. Nightmare! EOF - read -er -p '[1-5]: ' skill + read -er -p '[1-5]: ' skill - # If the user chose "Nightmare!" mode, get them to confirm, in the true - # spirit of things; otherwise, quit - if ((skill == 5)) ; then - while IFS= read -r line ; do - printf '%s\n' "$line" >&2 - done <<EOF + # If the user chose "Nightmare!" mode, get them to confirm, in the true + # spirit of things; otherwise, quit + if ((skill == 5)) ; then + while IFS= read -r line ; do + printf '%s\n' "$line" >&2 + done <<EOF Are you sure? This skill level isn't even remotely fair. EOF - read -er -p '[y/N]: ' confirm - [[ $confirm == [Yy]* ]] || exit 1 - fi + read -er -p '[y/N]: ' confirm + [[ $confirm == [Yy]* ]] || exit 1 + fi fi # Don't accept any other skill level settings case $skill in - 1|2|3|4|5) - ;; - *) - printf '%s: Unknown skill level\n' \ - "$self" >&2 - exit 2 + 1|2|3|4|5) + ;; + *) + printf '%s: Unknown skill level\n' \ + "$self" >&2 + exit 2 esac # Form a red prompt (hopefully) using terminal escapes ps1=$(printf '%sdoomsh[%u]\$%s ' \ - "$( { - tput AF 1 || tput setaf 1 - } 2>/dev/null )" \ - "$skill" \ - "$( { - tput me || tput sgr0 - } 2>/dev/null )" + "$( { + tput AF 1 || tput setaf 1 + } 2>/dev/null )" \ + "$skill" \ + "$( { + tput me || tput sgr0 + } 2>/dev/null )" ) # Set the limits based on the skill level @@ -105,13 +115,13 @@ memory=$((1 << (19 - skill))) # Display the limits printf >&2 '\n' printf >&2 'File size writing limit: %u blocks\n' \ - "$filesize" + "$filesize" printf >&2 'Open files limit: %u\n' \ - "$files" + "$files" printf >&2 'Stack size: %u kbytes\n' \ - "$stack" + "$stack" printf >&2 'Memory size: %u kbytes\n' \ - "$memory" + "$memory" printf >&2 '\n' # Record the current seconds since shell start, so we can tell how long the @@ -121,16 +131,16 @@ start=$SECONDS # Open a subshell so that the ulimit settings don't persist after the fork ( - # We only proceed if the ulimit call succeeds - ulimit \ - -f "$filesize" \ - -n "$files" \ - -s "$stack" \ - -v "$memory" \ - || exit 2 - DOOMSH=$skill PS1=$ps1 bash --norc + # We only proceed if the ulimit call succeeds + ulimit \ + -f "$filesize" \ + -n "$files" \ + -s "$stack" \ + -v "$memory" \ + || exit 2 + DOOMSH=$skill PS1=$ps1 bash --norc ) # Give the user some statistics about their performance printf >&2 '%s: You lasted %u seconds at skill level %u!\n' \ - "$self" "$((SECONDS - start))" "$skill" + "$self" "$((SECONDS - start))" "$skill" diff --git a/tests/Makefile b/tests/Makefile index 963e097..c2e0e72 100644 --- a/tests/Makefile +++ b/tests/Makefile @@ -1,8 +1,4 @@ .PHONY: all clean - -CC = clang - -all : files mem stack write - -clean : - rm -f files mem stack write +all: files mem stack write +clean: + rm -f -- $(ALL) diff --git a/tests/files.c b/tests/files.c index 1b2dafa..d11d530 100644 --- a/tests/files.c +++ b/tests/files.c @@ -1,16 +1,34 @@ +/** + * Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> + * + * This file is part of doomsh. + * + * doomsh is free software: you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation, either version 3 of the License, or (at your option) any later + * version. + * + * doomsh is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * doomsh. If not, see <https://www.gnu.org/licenses/>. + */ + #include <signal.h> #include <stdio.h> #include <stdlib.h> /* files.c -- Open as many files as we can */ int main(void) { - FILE *fp = NULL; - int i = 0; - for (;;i++) { - if ((fp = tmpfile()) == NULL) { - fprintf(stderr, "Created %u files\n", i); - perror("tmpfile"); - raise(SIGABRT); - } - } + FILE *fp = NULL; + int i = 0; + for (;;i++) { + if ((fp = tmpfile()) == NULL) { + fprintf(stderr, "Created %u files\n", i); + perror("tmpfile"); + raise(SIGABRT); + } + } } diff --git a/tests/mem.c b/tests/mem.c index b39e538..025446d 100644 --- a/tests/mem.c +++ b/tests/mem.c @@ -1,3 +1,21 @@ +/** + * Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> + * + * This file is part of doomsh. + * + * doomsh is free software: you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation, either version 3 of the License, or (at your option) any later + * version. + * + * doomsh is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * doomsh. If not, see <https://www.gnu.org/licenses/>. + */ + #include <signal.h> #include <stdio.h> #include <stdlib.h> @@ -11,13 +29,13 @@ * you really want to actually use the memory. Do you trust your OOM though? */ int main(void){ - void *ptr = NULL; - unsigned long mb = 5; - for (;;mb += 5) { - fprintf(stderr, "%lu MB\n", mb); - if ((ptr = realloc(ptr, mb * 1000000)) == NULL) { - raise(SIGABRT); - } - /* memset(ptr, 0, mb * 1000000); */ - } + void *ptr = NULL; + unsigned long mb = 5; + for (;;mb += 5) { + fprintf(stderr, "%lu MB\n", mb); + if ((ptr = realloc(ptr, mb * 1000000)) == NULL) { + raise(SIGABRT); + } + /* memset(ptr, 0, mb * 1000000); */ + } } diff --git a/tests/stack.c b/tests/stack.c index 3f89d8b..86bf042 100644 --- a/tests/stack.c +++ b/tests/stack.c @@ -1,3 +1,21 @@ +/** + * Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> + * + * This file is part of doomsh. + * + * doomsh is free software: you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation, either version 3 of the License, or (at your option) any later + * version. + * + * doomsh is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * doomsh. If not, see <https://www.gnu.org/licenses/>. + */ + #include <stdio.h> #include <stdlib.h> @@ -5,11 +23,11 @@ void rec(int *ip); /* stack.c -- Cause a stack overflow */ int main(void) { - int i = 0; - rec(&i); + int i = 0; + rec(&i); } void rec(int *ip) { - char i[256]; - printf("%u\n", (*ip)++); - rec(ip); + char i[256]; + printf("%u\n", (*ip)++); + rec(ip); } diff --git a/tests/write.c b/tests/write.c index df5bf88..e503951 100644 --- a/tests/write.c +++ b/tests/write.c @@ -1,21 +1,39 @@ +/** + * Copyright (C) 2016, 2018, 2021 Tom Ryder <tom@sanctum.geek.nz> + * + * This file is part of doomsh. + * + * doomsh is free software: you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation, either version 3 of the License, or (at your option) any later + * version. + * + * doomsh is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * doomsh. If not, see <https://www.gnu.org/licenses/>. + */ + #include <signal.h> #include <stdio.h> int main(void) { - FILE *fp = NULL; - int b = 1; - char c = '\0'; - if ((fp = tmpfile()) == NULL) { - perror("tmpfile"); - raise(SIGABRT); - } - for (;;b++) { - if (fwrite(&c, 1, 1, fp) == 0) { - perror("fwrite"); - raise(SIGABRT); - } - if (b % 1000 == 0) { - fprintf(stderr, "Wrote %u octets\n", b); - } - } + FILE *fp = NULL; + int b = 1; + char c = '\0'; + if ((fp = tmpfile()) == NULL) { + perror("tmpfile"); + raise(SIGABRT); + } + for (;;b++) { + if (fwrite(&c, 1, 1, fp) == 0) { + perror("fwrite"); + raise(SIGABRT); + } + if (b % 1000 == 0) { + fprintf(stderr, "Wrote %u octets\n", b); + } + } } |