From 51664faebcc10b53a1a78cff95f0efc04a2c7f8e Mon Sep 17 00:00:00 2001 From: sin Date: Thu, 6 Feb 2014 11:14:33 +0000 Subject: Initial commit --- LICENSE | 21 ++++++++++ Makefile | 57 +++++++++++++++++++++++++ config.def.h | 6 +++ config.h | 6 +++ config.mk | 12 ++++++ sinit.c | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ util.h | 5 +++ util/eprintf.c | 46 ++++++++++++++++++++ 8 files changed, 282 insertions(+) create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 config.def.h create mode 100644 config.h create mode 100644 config.mk create mode 100644 sinit.c create mode 100644 util.h create mode 100644 util/eprintf.c diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..1b4b4fa --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT/X Consortium License + +© 2014 sin + +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..2e5d71b --- /dev/null +++ b/Makefile @@ -0,0 +1,57 @@ +include config.mk + +.POSIX: +.SUFFIXES: .c .o + +LIB = \ + util/eprintf.o + +SRC = sinit.c + +OBJ = $(SRC:.c=.o) $(LIB) +BIN = $(SRC:.c=) + +all: options binlib + +options: + @echo sinit build options: + @echo "CFLAGS = $(CFLAGS)" + @echo "LDFLAGS = $(LDFLAGS)" + @echo "CC = $(CC)" + +binlib: util.a + $(MAKE) bin + +bin: $(BIN) + +$(OBJ): config.h util.h config.mk + +config.h: + @echo creating $@ from config.def.h + @cp config.def.h $@ + +.o: + @echo LD $@ + @$(LD) -o $@ $< util.a $(LDFLAGS) + +.c.o: + @echo CC $< + @$(CC) -c -o $@ $< $(CFLAGS) + +util.a: $(LIB) + @echo AR $@ + @$(AR) -r -c $@ $(LIB) + @ranlib $@ + +install: all + @echo installing executable to $(DESTDIR)$(PREFIX)/bin + @cp -f $(BIN) $(DESTDIR)$(PREFIX)/bin + @cd $(DESTDIR)$(PREFIX)/bin && chmod 755 $(BIN) + +uninstall: + @echo removing executable from $(DESTDIR)$(PREFIX)/bin + @cd $(DESTDIR)$(PREFIX)/bin && rm -f $(BIN) + +clean: + @echo cleaning + @rm -f $(BIN) $(OBJ) $(LIB) util.a diff --git a/config.def.h b/config.def.h new file mode 100644 index 0000000..050d7e0 --- /dev/null +++ b/config.def.h @@ -0,0 +1,6 @@ +/* See LICENSE file for copyright and license details. */ +static const char *fifopath = "/var/run/sinit.fifo"; +static Command commands[] = { + { "poweroff", cmdpoweroff, {0} }, + { "reboot", cmdreboot, {0} }, +}; diff --git a/config.h b/config.h new file mode 100644 index 0000000..050d7e0 --- /dev/null +++ b/config.h @@ -0,0 +1,6 @@ +/* See LICENSE file for copyright and license details. */ +static const char *fifopath = "/var/run/sinit.fifo"; +static Command commands[] = { + { "poweroff", cmdpoweroff, {0} }, + { "reboot", cmdreboot, {0} }, +}; diff --git a/config.mk b/config.mk new file mode 100644 index 0000000..59165d8 --- /dev/null +++ b/config.mk @@ -0,0 +1,12 @@ +# sinit version +VERSION = 0.1 + +# paths +PREFIX = /usr/local +MANPREFIX = $(PREFIX)/man + +CC = cc +LD = $(CC) +CPPFLAGS = +CFLAGS = -Wall -Os $(CPPFLAGS) +LDFLAGS = -static diff --git a/sinit.c b/sinit.c new file mode 100644 index 0000000..dee71b1 --- /dev/null +++ b/sinit.c @@ -0,0 +1,129 @@ +/* See LICENSE file for copyright and license details. */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "util.h" + +typedef union { + const void *v; +} Arg; + +typedef struct { + const char *name; + void (*func)(const Arg *arg); + const Arg arg; +} Command; + +static void cmdpoweroff(const Arg *); +static void cmdreboot(const Arg *); +static void dispatchcmd(int); +static void spawn(const char *, char *const []); + +#include "config.h" + +int +main(void) +{ + sigset_t set; + pid_t pid; + fd_set rfds; + int c, fd, n; + + if (getpid() != 1) + return EXIT_FAILURE; + + sigfillset(&set); + sigprocmask(SIG_BLOCK, &set, 0); + + pid = fork(); + if (pid < 0) + return EXIT_FAILURE; + if (pid > 0) + for (;;) + wait(&c); + + sigprocmask(SIG_UNBLOCK, &set, 0); + + spawn("/bin/rc", (char *[]){ "rc", NULL }); + + unlink(fifopath); + umask(0); + if (mkfifo(fifopath, 0600) < 0) + eprintf("mkfifo %s:"); + + fd = open(fifopath, O_RDWR | O_NONBLOCK); + if (fd < 0) + eprintf("open %s:", fifopath); + while (1) { + FD_ZERO(&rfds); + FD_SET(fd, &rfds); + n = select(fd + 1, &rfds, NULL, NULL, NULL); + if (n < 0) + eprintf("select:"); + if (FD_ISSET(fd, &rfds)) + dispatchcmd(fd); + } + + return EXIT_SUCCESS; +} + +static void +cmdpoweroff(const Arg *arg) +{ + spawn("/bin/rc.shutdown", (char *[]) { "rc", "poweroff", NULL }); +} + +static void +cmdreboot(const Arg *arg) +{ + spawn("/bin/rc.shutdown", (char *[]) { "rc", "reboot", NULL }); +} + +static void +dispatchcmd(int fd) +{ + int i; + char buf[BUFSIZ], *p; + ssize_t n; + + n = read(fd, buf, sizeof(buf) - 1); + if (n < 0) + eprintf("read:"); + if (n == 0) + return; + buf[n] = '\0'; + p = strchr(buf, '\n'); + if (p) + *p = '\0'; + for (i = 0; i < LEN(commands); i++) { + if (strcmp(commands[i].name, buf) == 0) { + commands[i].func(&commands[i].arg); + break; + } + } +} + +static void +spawn(const char *file, char *const argv[]) +{ + pid_t pid; + + pid = fork(); + if (pid < 0) + eprintf("fork:"); + if (pid == 0) { + setsid(); + setpgid(0, 0); + execvp(file, argv); + _exit(errno == ENOENT ? 127 : 126); + } +} diff --git a/util.h b/util.h new file mode 100644 index 0000000..4fe1391 --- /dev/null +++ b/util.h @@ -0,0 +1,5 @@ +/* See LICENSE file for copyright and license details. */ +#define LEN(x) (sizeof (x) / sizeof *(x)) + +void enprintf(int, const char *, ...); +void eprintf(const char *, ...); diff --git a/util/eprintf.c b/util/eprintf.c new file mode 100644 index 0000000..6d6fa65 --- /dev/null +++ b/util/eprintf.c @@ -0,0 +1,46 @@ +/* See LICENSE file for copyright and license details. */ +#include +#include +#include +#include + +#include "../util.h" + +char *argv0; + +static void venprintf(int, const char *, va_list); + +void +eprintf(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + venprintf(EXIT_FAILURE, fmt, ap); + va_end(ap); +} + +void +enprintf(int status, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + venprintf(status, fmt, ap); + va_end(ap); +} + +void +venprintf(int status, const char *fmt, va_list ap) +{ + fprintf(stderr, "%s: ", argv0); + + vfprintf(stderr, fmt, ap); + + if(fmt[0] && fmt[strlen(fmt)-1] == ':') { + fputc(' ', stderr); + perror(NULL); + } + + exit(status); +} -- cgit v1.2.3-54-g00ecf