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sysvinit/showconsole-1.10.dif

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--- Makefile
+++ Makefile 2010-05-28 14:15:39.662925024 +0000
@@ -62,7 +62,7 @@ TODO = showconsole blogd blogger isseria
all: $(TODO)
libconsole.o: libconsole.c libconsole.h
- $(CC) $(CFLAGS) $(CLOOP) -c $< -pthread
+ $(CC) $(CFLAGS) $(CLOOP) -D_REENTRANT -c $< -pthread
libblogger.o: libblogger.c libblogger.h
$(CC) $(CFLAGS) $(CLOOP) -c $<
@@ -74,7 +74,7 @@ showconsole: showconsole.c libconsole.o
$(CC) $(CFLAGS) $(CLOOP) -o $@ $^ -Wl,--as-needed -pthread
blogd: blogd.c libconsole.o
- $(CC) $(CFLAGS) $(CLOOP) -o $@ $^ -Wl,--as-needed -lutil -pthread
+ $(CC) $(CFLAGS) $(CLOOP) -D_REENTRANT -o $@ $^ -Wl,--as-needed -lutil -pthread
blogger: blogger.c libblogger.a
$(CC) $(CFLAGS) $(CLOOP) -o $@ $^
--- blogd.8
+++ blogd.8 2010-05-04 09:57:15.679656772 +0000
@@ -58,6 +58,13 @@ that now it is able to write on
which means that the file system is
mounted read/write and the kernel
messages are written to that file.
+.TP
+.B SIGSYS
+says
+.B blogd
+that it should stop writing to disk but
+continue to repeat messages to the old
+devices of the system console.
\."
.SH BUGS
.B blogd
--- blogd.c
+++ blogd.c 2010-05-28 14:31:23.748444849 +0000
@@ -24,6 +24,7 @@
#include <errno.h>
#include <paths.h>
#include "libconsole.h"
+extern volatile sig_atomic_t nsigsys;
/*
* Internal logger
@@ -102,11 +103,22 @@ static struct sigaction saved_sighup;
static struct sigaction saved_sigint;
static struct sigaction saved_sigquit;
static struct sigaction saved_sigterm;
+static struct sigaction saved_sigsys;
static volatile sig_atomic_t signaled = 0;
static void sighandle(int sig)
{
- signaled = sig;
+ if (nsigsys && (sig == SIGTERM))
+ return;
+ signaled = (volatile sig_atomic_t)sig;
+}
+
+/*
+ * Stop writing logs to disk, only repeat messages
+ */
+static void sigsys(int sig)
+{
+ nsigsys = (volatile sig_atomic_t)sig;
}
static void set_signal(int sig, struct sigaction *old, sighandler_t handler)
@@ -116,7 +128,7 @@ static void set_signal(int sig, struct s
break;
} while (errno == EINTR);
- if (old->sa_handler != handler) {
+ if (old && old->sa_handler != handler) {
struct sigaction new;
sigset_t sigset;
@@ -143,7 +155,7 @@ static void reset_signal(int sig, struct
break;
} while (errno == EINTR);
- if (old->sa_handler == cur.sa_handler) {
+ if (old && old->sa_handler == cur.sa_handler) {
do {
if (sigaction(sig, old, NULL) == 0)
break;
@@ -320,6 +332,7 @@ int main(int argc, char *argv[])
if (ioctl(pts, TIOCCONS, NULL) < 0)
error("can not set console device to %s: %s\n", ptsname, strerror(errno));
+ nsigsys = 0;
set_signal(SIGTTIN, &saved_sigttin, SIG_IGN);
set_signal(SIGTTOU, &saved_sigttou, SIG_IGN);
set_signal(SIGTSTP, &saved_sigtstp, SIG_IGN);
@@ -327,9 +340,11 @@ int main(int argc, char *argv[])
set_signal(SIGINT, &saved_sigint, sighandle);
set_signal(SIGQUIT, &saved_sigquit, sighandle);
set_signal(SIGTERM, &saved_sigterm, sighandle);
+ set_signal(SIGSYS, &saved_sigsys, sigsys);
(void)siginterrupt(SIGINT, 0);
(void)siginterrupt(SIGQUIT, 0);
(void)siginterrupt(SIGTERM, 0);
+ (void)siginterrupt(SIGSYS, 0);
switch ((pid = fork())) {
case 0:
@@ -364,11 +379,22 @@ int main(int argc, char *argv[])
fflush(stdout);
exit(0);
}
- pidfile();
- prepareIO(reconnect, pgrp, 0, 1, fd2);
+
+ prepareIO(reconnect, pidfile, pgrp, 0, 1, fd2);
while (!signaled)
safeIO();
+ (void)tcdrain(1);
+ (void)tcdrain(2);
+ if (fd2 > 0)
+ (void)tcdrain(fd2);
+
+ errno = 0;
+ if ((fd = open("/dev/console", O_RDWR|O_NOCTTY)) >= 0) {
+ (void)ioctl(fd, TIOCCONS, NULL); /* Restore old console mapping */
+ close(fd);
+ }
+
if (!cntrtty)
kill(ppid, SIGSTOP);
closeIO();
@@ -394,6 +420,7 @@ int main(int argc, char *argv[])
reset_signal(SIGINT, &saved_sigint);
reset_signal(SIGQUIT, &saved_sigquit);
reset_signal(SIGTERM, &saved_sigterm);
+ reset_signal(SIGSYS, &saved_sigsys);
return 0;
}
--- libconsole.c
+++ libconsole.c 2010-05-28 13:57:01.458924791 +0000
@@ -155,7 +155,7 @@ out:
/*
* Arg used: safe out
*/
-static void (*vc_reconnect)(int fd) = NULL;
+static void (*vc_reconnect)(int fd);
static inline void safeout (int fd, const char *ptr, size_t s)
{
int saveerr = errno;
@@ -291,6 +291,7 @@ static int fdfifo = -1;
/*
* Signal control for writing on log file
*/
+volatile sig_atomic_t nsigsys = 0;
static volatile sig_atomic_t nsigio = -1;
static sigset_t save_oldset;
@@ -382,7 +383,7 @@ xout:
static inline void writelog(void)
{
if (!flog)
- goto xout;;
+ goto xout;
clearerr(flog);
lock(&llock);
while (avail > 0) {
@@ -715,6 +716,7 @@ static void *action(void *dummy)
sigaddset(&sigset, SIGINT);
sigaddset(&sigset, SIGQUIT);
sigaddset(&sigset, SIGTERM);
+ sigaddset(&sigset, SIGSYS);
(void)pthread_sigmask(SIG_BLOCK, &sigset, &save_oldset);
lock(&ljoin);
@@ -739,11 +741,13 @@ static void *action(void *dummy)
* Prepare I/O
*/
static const char *fifo_name = _PATH_BLOG_FIFO;
+static void (*vr_access)(void);
static pid_t pgroup = -1;
-void prepareIO(void (*rfunc)(int), const pid_t pgrp, const int in, const int out, const int second)
+void prepareIO(void (*rfunc)(int), void (*pfunc)(void), const pid_t pgrp, const int in, const int out, const int second)
{
vc_reconnect = rfunc;
+ vr_access = pfunc;
pgroup = pgrp;
fdread = in;
fdwrite = out;
@@ -871,6 +875,10 @@ void safeIO (void)
error("Can not open %s: %s\n", BOOT_LOGFILE, STRERR);
goto skip;
}
+ if (vr_access) {
+ (*vr_access)();
+ vr_access = NULL;
+ }
if ((flog = fdopen (log, "a")) == NULL)
error("Can not open %s: %s\n", BOOT_LOGFILE, STRERR);
@@ -915,6 +923,15 @@ skip:
pthread_setschedparam(pthread_self(), policy, &param);
pthread_setschedparam(lthread, policy, &param);
}
+
+ if (nsigsys) { /* Stop writing logs to disk, only repeat messages */
+ if (flog)
+ closeIO();
+ if (nsigio < 0) {
+ nsigio = SIGIO;
+ (void)signal(SIGIO, SIG_IGN);
+ }
+ }
}
/*
@@ -926,11 +943,9 @@ void closeIO(void)
int n = 240;
/* Maybe we've catched a signal, therefore */
- if (flog) {
- fflush(flog); /* Clear out stdio buffers */
- fdatasync(fileno(flog));
- } else
+ if (!flog && !nsigsys)
warn("no message logging because /var file system is not accessible\n");
+
(void)tcdrain(fdwrite); /* Hold in sync with console */
if (fdsec > 0)
(void)tcdrain(fdsec); /* Hold in sync with second console */
@@ -949,9 +964,8 @@ void closeIO(void)
timeout.tv_usec = 25*1000;
more_input(&timeout, 1);
+ (void)tcdrain(fdread);
- if (!flog)
- break;
} while (timeout.tv_sec || timeout.tv_usec);
if (running) {
--- libconsole.h
+++ libconsole.h 2009-12-21 14:54:41.299449887 +0000
@@ -2,6 +2,6 @@ extern void pushd(const char * path);
extern void popd(void);
extern char * fetchtty(const pid_t pid, const pid_t ppid, unsigned int *mjmi);
extern char * secondtty(char * compare);
-extern void prepareIO(void (*rfunc)(int), const pid_t pgrp, const int in, const int out, const int second);
+extern void prepareIO(void (*rfunc)(int), void (*pfunc)(void), const pid_t pgrp, const int in, const int out, const int second);
extern void safeIO (void);
extern void closeIO(void);
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