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Finit-alt listens to /dev/initctl

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This allows us to use the standard reboot utility in Linux to perform
a fast reboot.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
This commit is contained in:
Claudio Matsuoka
2008-05-27 16:29:34 -03:00
parent 57ad91136b
commit d5037d1352
2 changed files with 58 additions and 0 deletions
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Makefile
+3
View File
@@ -30,6 +30,9 @@ CFLAGS += -march=pentium-m
# Use built-in run-parts instead of /bin/run-parts
CFLAGS += -DBUILTIN_RUNPARTS
# Listen to /dev/initctl to handle reboot requests
CFLAGS += -DLISTEN_INITCTL
#### End of configurable parameters
finit-alt.c
+55
View File
@@ -79,6 +79,20 @@ THE SOFTWARE.
sigaction(sig, &sa, NULL); \
} while (0)
#ifdef LISTEN_INITCTL
#define INIT_MAGIC 0x03091969
#define INIT_CMD_RUNLVL 1
struct init_request {
int magic; /* Magic number */
int cmd; /* What kind of request */
int runlevel; /* Runlevel to change to */
int sleeptime; /* Time between TERM and KILL */
char data[368];
};
#endif
#define touch(x) mknod((x), S_IFREG|0644, 0)
#define chardev(x,m,maj,min) mknod((x), S_IFCHR|(m), makedev((maj),(min)))
#define blkdev(x,m,maj,min) mknod((x), S_IFBLK|(m), makedev((maj),(min)))
@@ -125,6 +139,12 @@ int main()
char username[USERNAME_SIZE] = DEFUSER;
char hostname[HOSTNAME_SIZE] = "eviltwin";
char cmd[CMD_SIZE];
#ifdef LISTEN_INITCTL
fd_set rfds;
int ctl;
struct init_request req;
struct timespec timeout;
#endif
puts("finit-alt " VERSION " (built " __DATE__ " by " WHOAMI ")");
@@ -397,9 +417,44 @@ int main()
sleep(1);
system("/usr/sbin/services.sh &>/dev/null&");
#ifdef LISTEN_INITCTL
mkfifo("/dev/initctl", 0600);
ctl = open("/dev/initctl", O_RDONLY);
timeout.tv_sec = 0;
timeout.tv_nsec = 100000000;
#endif
while (1) {
sigemptyset(&nmask);
#ifdef LISTEN_INITCTL
FD_ZERO(&rfds);
FD_SET(ctl, &rfds);
if (ctl < 0) {
pselect(0, NULL, NULL, NULL, NULL, &nmask);
continue;
}
if (pselect(ctl + 1, &rfds, NULL, NULL, NULL, &nmask) < 0)
continue;
read(ctl, &req, sizeof (req));
if (req.magic == INIT_MAGIC) {
switch (req.cmd) {
case INIT_CMD_RUNLVL:
switch (req.runlevel) {
case '0':
raise(SIGUSR2);
break;
case '6':
raise(SIGUSR1);
}
}
}
#else
pselect(0, NULL, NULL, NULL, NULL, &nmask);
#endif
}
}