Mercurial > vinit
changeset 0:810d59028aae
misc: initial import
| author | David Demelier <markand@malikania.fr> |
|---|---|
| date | Wed, 28 Jul 2021 14:28:31 +0200 |
| parents | |
| children | 4662c96a5794 |
| files | .hgignore LICENSE.md Makefile README.md vinit.8 vinit.c |
| diffstat | 6 files changed, 249 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.hgignore Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,10 @@ +# vim/emacs specific. +^tags$ +^tags.lock$ +^tags.temp$ +\.swp$ +\.swo$ + +# object files. +\.o$ +^vinit$
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LICENSE.md Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,16 @@ +vinit ISC LICENSE +================= + +Copyright (c) 2021 David Demelier <markand@malikania.fr> + +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.
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Makefile Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,51 @@ +# +# Makefile -- basic Makefile for vinit +# +# Copyright (c) 2021 David Demelier <markand@malikania.fr> +# +# 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. +# + +.POSIX: + +CC= cc +CFLAGS= -Wall -Wextra -O3 -DNDEBUG + +PREFIX= /usr/local +BINDIR= ${PREFIX}/sbin +MANDIR= ${PREFIX}/share/man + +SRCS= vinit.c +OBJS= ${SRCS:.c=.o} + +.SUFFIXES: +.SUFFIXES: .c .o + +all: vinit + +.c.o: + ${CC} ${CFLAGS} -c $< -o $@ + +vinit: ${OBJS} + ${CC} ${CFLAGS} -o $@ ${OBJS} ${LDFLAGS} + +install: + mkdir -p ${DESTDIR}${BINDIR} + cp vinit ${DESTDIR}${BINDIR} + mkdir -p ${DESTDIR}${MANDIR}/man8 + cp vinit.8 ${DESTDIR}${MANDIR}/man8 + +clean: + rm -f vinit ${OBJS} + +.PHONY: all clean install
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README.md Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,30 @@ +vinit +===== + +Vanilla Linux init system. + +It's sole purpose is to run the following services files: + +- /etc/rc.init: starts the system, +- /etc/rc.shutdown: shutdown the system. + +Features and non features +------------------------- + +- Spawn startup and shutdown scripts, +- Reap child processes, +- Does not know anything related to services, +- Does not your networking, DNS, DHCP, UEFI, journaling, etc. + +You may want to check vinit-scripts project for a set of default scripts for a +better out of the box experience. + +Documentation +------------- + +See vinit(8) manual page. + +Author +------ + +David Demelier <markand@malikania.fr>
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/vinit.8 Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,61 @@ +.\" +.\" vinit.8 -- vanilla init +.\" +.\" Copyright (c) 2021 David Demelier <markand@malikania.fr> +.\" +.\" 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. +.\" +.Dd July 28, 2021 +.Dt VINIT 8 +.Os +.Sh NAME +.Nm vinit +.Nd vanilla init +.Sh DESCRIPTION +.Nm +is the official default init system for Vanilla Linux. It's sole purpose is to +start init scripts and shutdown the system. +.Ss Startup +When the system starts, +.Nm +invokes +.Pa /etc/rc.init +which setups the system and starts some services. There is not respawning +process, an external tool should be used for that purpose. +.Ss Shutdown +When a signal is received the script +.Pa /etc/rc.shutdown +is invoked with a unique argument defined as follow: +.Bl -tag +.It USR1 +Pass +.Dq halt +as argument, halt the system without powering off. The +.Xr halt 8 +command can be used. +.It USR2 +Pass +.Dq poweroff +as argument, halt the system and powering it off. The +.Xr poweroff 8 +command can be used. +.It TERM +Pass +.Dq reboot +as argument, kill services and reboot the system. The +.Xr reboot 8 +command can be used. +.Sh AUTHORS +.Nm +was written by +.An David Demelier <markand@malikania.fr> .
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/vinit.c Wed Jul 28 14:28:31 2021 +0200 @@ -0,0 +1,81 @@ +#include <sys/wait.h> +#include <errno.h> +#include <signal.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdnoreturn.h> +#include <string.h> +#include <unistd.h> + +static char * const rcinit[] = { "/etc/rc.init", NULL }; +static char * const rchalt[] = { "/etc/rc.shutdown", "halt", NULL }; +static char * const rcpoweroff[] = { "/etc/rc.shutdown", "poweroff", NULL }; +static char * const rcreboot[] = { "/etc/rc.shutdown", "reboot", NULL }; + +static sigset_t set; + +noreturn static void +die(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + exit(1); +} + +static void +spawn(char * const args[]) +{ + switch (fork()) { + case 0: + sigprocmask(SIG_UNBLOCK, &set, NULL); + setsid(); + execv(args[0], args); + perror("execv"); + exit(1); + case 1: + perror("fork"); + default: + break; + } +} + +int +main(void) +{ + int sig; + + if (getpid() != 1) + die("abort: must be ran as PID 1\n"); + if (chdir("/") < 0) + die("abort: %s\n", strerror(errno)); + + sigfillset(&set); + sigprocmask(SIG_BLOCK, &set, NULL); + spawn(rcinit); + + for (;;) { + sigwait(&set, &sig); + + /* Match busybox defaults. */ + switch (sig) { + case SIGUSR1: + spawn(rchalt); + break; + case SIGUSR2: + spawn(rcpoweroff); + break; + case SIGTERM: + spawn(rcreboot); + break; + case SIGCHLD: + while (waitpid(-1, NULL, WNOHANG) > 0) + continue; + default: + break; + } + } +}