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Fix #38: add option -C file for alt. kernel seqno cache file

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg 2021-06-30 22:39:09 +02:00
parent 39ffa1b4cb
commit e381bc3620
2 changed files with 24 additions and 7 deletions
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11
man/syslogd.8
View File

@ -43,6 +43,7 @@
.Op Fl a Ar name[:port] .Op Fl a Ar name[:port]
.Op Fl b Ar addr[:port] .Op Fl b Ar addr[:port]
.Op Fl b Ar :port .Op Fl b Ar :port
.Op Fl C Ar file
.Op Fl f Ar file .Op Fl f Ar file
.Op Fl m Ar interval .Op Fl m Ar interval
.Op Fl P Ar file .Op Fl P Ar file
@ -209,6 +210,16 @@ is
.Ql syslog . .Ql syslog .
This option can be specified multiple times to bind to This option can be specified multiple times to bind to
multiple addresses and/or ports. multiple addresses and/or ports.
.It Fl C Ar file
File to use for caching last read kernel sequence number from
.Pa /dev/kmsg ,
default:
.Pa /run/syslogd.cache .
If
.Nm
cannot write to, or read from, this file it will cause repeated kernel
log messages when restarting
.Nm .
.It Fl d .It Fl d
Put Put
.Nm .Nm

14
src/syslogd.c
View File

@ -96,6 +96,7 @@ static char sccsid[] __attribute__((unused)) =
#include "timer.h" #include "timer.h"
#include "compat.h" #include "compat.h"
char *CacheFile = _PATH_CACHE;
char *ConfFile = _PATH_LOGCONF; char *ConfFile = _PATH_LOGCONF;
char *PidFile = _PATH_LOGPID; char *PidFile = _PATH_LOGPID;
char ctty[] = _PATH_CONSOLE; char ctty[] = _PATH_CONSOLE;
@ -202,7 +203,7 @@ static void sys_seqno_load(void)
char buf[32], *str; char buf[32], *str;
FILE *fp; FILE *fp;
fp = fopen(_PATH_CACHE, "r"); fp = fopen(CacheFile, "r");
if (!fp) if (!fp)
return; return;
@ -235,7 +236,7 @@ static void sys_seqno_save(void)
if (prev == sys_seqno) if (prev == sys_seqno)
return; /* no changes since last save */ return; /* no changes since last save */
fp = fopen(_PATH_CACHE, "w"); fp = fopen(CacheFile, "w");
if (!fp) if (!fp)
return; /* best effort, ignore any errors */ return; /* best effort, ignore any errors */
@ -273,6 +274,7 @@ int usage(int code)
" :port UDP port number, or service name\n" " :port UDP port number, or service name\n"
" default: 'syslog', port 514\n" " default: 'syslog', port 514\n"
"\n" "\n"
" -C FILE File to cache last read kernel seqno, default: %s\n"
" -d Enable debug mode, implicitly enables -F to prevent backgrounding\n" " -d Enable debug mode, implicitly enables -F to prevent backgrounding\n"
" -F Run in foreground, required when monitored by init(1)\n" " -F Run in foreground, required when monitored by init(1)\n"
" -f FILE Alternate .conf file, default: %s\n" " -f FILE Alternate .conf file, default: %s\n"
@ -293,7 +295,7 @@ int usage(int code)
" -v Show program version and exit\n" " -v Show program version and exit\n"
"\n" "\n"
"Bug report address: %s\n", "Bug report address: %s\n",
_PATH_LOGCONF, _PATH_LOGPID, _PATH_LOG, _PATH_LOGCONF, PACKAGE_BUGREPORT); _PATH_CACHE, _PATH_LOGCONF, _PATH_LOGPID, _PATH_LOG, _PATH_LOGCONF, PACKAGE_BUGREPORT);
#ifdef PACKAGE_URL #ifdef PACKAGE_URL
printf("Project home page: %s\n", PACKAGE_URL); printf("Project home page: %s\n", PACKAGE_URL);
#endif #endif
@ -308,7 +310,7 @@ int main(int argc, char *argv[])
int pflag = 0, bflag = 0; int pflag = 0, bflag = 0;
int ch; int ch;
while ((ch = getopt(argc, argv, "46Aa:b:dHFf:km:nP:p:r:sTv?")) != EOF) { while ((ch = getopt(argc, argv, "46Aa:b:C:dHFf:km:nP:p:r:sTv?")) != EOF) {
switch ((char)ch) { switch ((char)ch) {
case '4': case '4':
family = PF_INET; family = PF_INET;
@ -338,6 +340,10 @@ int main(int argc, char *argv[])
}); });
break; break;
case 'C': /* kernel seqno cache file */
CacheFile = optarg;
break;
case 'd': /* debug */ case 'd': /* debug */
Debug = 1; Debug = 1;
Foreground = 1; Foreground = 1;