mirror of
https://github.com/troglobit/finit.git
synced 2026-10-01 05:22:48 +07:00
Joachim Nilsson
b0aec188bc
finit.c:
o Perform signal setup as soon as possible, no need to do any
mounting of /proc or /sys beforehand
o Move signal setup and callbacks to a file of its own
o Use more #defines for hard coded strings
o Use a more neutral default hostname
signal.c:
o New file, for setup and signal handlers
o Add support for SIGSTOP/SIGSTP and SIGCONT. This pauses finit
respawning of xinit/shell. Useful for, e.g., debugging
o Document each ignored and handled signal better
o Disable SIGUSR1 and SIGUSR2 for now, will be reenabled later
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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Improved fast init
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Copyright (c) 2008 Claudio Matsuoka
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifdef LISTEN_INITCTL
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#include <features.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/select.h> /* According to POSIX.1-2001 */
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "finit.h"
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#define INIT_MAGIC 0x03091969
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#define INIT_CMD_RUNLVL 1
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struct init_request {
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int magic; /* Magic number */
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int cmd; /* What kind of request */
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int runlevel; /* Runlevel to change to */
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int sleeptime; /* Time between TERM and KILL */
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char data[368];
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};
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/* Standard reboot/shutdown utilities talk to init using /dev/initctl.
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* We should check if the fifo was recreated and reopen it.
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*/
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void listen_initctl(void)
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{
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if (!fork()) {
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int ctl;
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fd_set fds;
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struct init_request request;
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mkfifo("/dev/initctl", 0600);
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ctl = open("/dev/initctl", O_RDONLY);
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while (1) {
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FD_ZERO(&fds);
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FD_SET(ctl, &fds);
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if (select(ctl + 1, &fds, NULL, NULL, NULL) <= 0)
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continue;
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read(ctl, &request, sizeof(request));
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if (request.magic != INIT_MAGIC)
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continue;
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if (request.cmd == INIT_CMD_RUNLVL) {
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switch (request.runlevel) {
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case '0':
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do_shutdown(SIGUSR2);
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break;
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case '6':
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do_shutdown(SIGUSR1);
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}
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}
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}
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}
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}
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#endif /* LISTEN_INITCTL */
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/**
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* Local Variables:
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* version-control: t
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* c-file-style: "linux"
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* End:
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*/
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