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2005-02-03 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

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* log.c: (syslog_sigsafe) Reduce scope of syslog_fd: it is accessed
	  inside this function only.
	  (open_crashlog) New function to open /var/tmp/quagga.<daemon>.crashlog
	  with flags O_WRONLY|O_CREAT|O_EXCL to save some crash info.
	  (zlog_signal,_zlog_assert_failed) Increase logging priority from
	  LOG_ERR to LOG_CRIT.  If no file logging is configured, try to use
	  open_crashlog to create a crash logfile.
	  (zlog_backtrace_sigsafe) If a crashlog file descriptor is open,
	  dump a backtrace to that file.
This commit is contained in:
ajs 2005-02-03 16:42:40 +00:00
parent 847947f20b
commit 1e2213541b
2 changed files with 83 additions and 19 deletions
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12
lib/ChangeLog
View File

@ -1,3 +1,15 @@
2005-02-03 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* log.c: (syslog_sigsafe) Reduce scope of syslog_fd: it is accessed
inside this function only.
(open_crashlog) New function to open /var/tmp/quagga.<daemon>.crashlog
with flags O_WRONLY|O_CREAT|O_EXCL to save some crash info.
(zlog_signal,_zlog_assert_failed) Increase logging priority from
LOG_ERR to LOG_CRIT. If no file logging is configured, try to use
open_crashlog to create a crash logfile.
(zlog_backtrace_sigsafe) If a crashlog file descriptor is open,
dump a backtrace to that file.
2005-02-02 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* if.h: Declare if_flag_dump.

90
lib/log.c
View File

@ -1,5 +1,5 @@
/*
* $Id: log.c,v 1.23 2005/01/18 22:18:59 ajs Exp $
* $Id: log.c,v 1.24 2005/02/03 16:42:40 ajs Exp $
*
* Logging of zebra
* Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
@ -31,6 +31,9 @@
#include <sys/un.h>
#endif
static int crashlog_fd = -1; /* Used for last-resort crash logfile when a
signal is caught. */
struct zlog *zlog_default = NULL;
const char *zlog_proto_names[] =
@ -197,8 +200,6 @@ hex_append(char *s, int len, u_long x)
}
#endif
static int syslog_fd = -1;
/* Needs to be enhanced to support Solaris. */
static int
syslog_connect(void)
@ -233,6 +234,7 @@ syslog_connect(void)
static void
syslog_sigsafe(int priority, const char *msg, size_t msglen)
{
static int syslog_fd = -1;
char buf[sizeof("<1234567890>ripngd[1234567890]: ")+msglen+50];
char *s;
@ -258,6 +260,38 @@ syslog_sigsafe(int priority, const char *msg, size_t msglen)
#undef LOC
}
static int
open_crashlog(void)
{
#define CRASHLOG_PREFIX "/var/tmp/quagga."
#define CRASHLOG_SUFFIX "crashlog"
if (zlog_default && zlog_default->ident)
{
/* Avoid strlen since it is not async-signal-safe. */
const char *p;
size_t ilen;
for (p = zlog_default->ident, ilen = 0; *p; p++)
ilen++;
{
char buf[sizeof(CRASHLOG_PREFIX)+ilen+sizeof(CRASHLOG_SUFFIX)+3];
char *s = buf;
#define LOC s,buf+sizeof(buf)-s
s = str_append(LOC, CRASHLOG_PREFIX);
s = str_append(LOC, zlog_default->ident);
s = str_append(LOC, ".");
s = str_append(LOC, CRASHLOG_SUFFIX);
#undef LOC
*s = '\0';
return open(buf, O_WRONLY|O_CREAT|O_EXCL, LOGFILE_MASK);
}
}
return open(CRASHLOG_PREFIX CRASHLOG_SUFFIX, O_WRONLY|O_CREAT|O_EXCL,
LOGFILE_MASK);
#undef CRASHLOG_SUFFIX
#undef CRASHLOG_PREFIX
}
/* Note: the goal here is to use only async-signal-safe functions. */
void
zlog_signal(int signo, const char *action
@ -301,17 +335,21 @@ zlog_signal(int signo, const char *action
*s++ = '\n';
/* N.B. implicit priority is most severe */
#define PRI LOG_ERR
#define PRI LOG_CRIT
#define DUMP(FP) write(fileno(FP),buf,s-buf);
#define DUMP(FD) write(FD, buf, s-buf);
/* If no file logging configured, try to write to fallback log file. */
if ((!zlog_default || !zlog_default->fp) &&
((crashlog_fd = open_crashlog()) >= 0))
DUMP(crashlog_fd)
if (!zlog_default)
DUMP(stderr)
DUMP(fileno(stderr))
else
{
if ((PRI <= zlog_default->maxlvl[ZLOG_DEST_FILE]) && zlog_default->fp)
DUMP(zlog_default->fp)
DUMP(fileno(zlog_default->fp))
if (PRI <= zlog_default->maxlvl[ZLOG_DEST_STDOUT])
DUMP(stdout)
DUMP(fileno(stdout))
/* Remove trailing '\n' for monitor and syslog */
*--s = '\0';
if (PRI <= zlog_default->maxlvl[ZLOG_DEST_MONITOR])
@ -353,25 +391,27 @@ zlog_backtrace_sigsafe(int priority, void *program_counter)
s = num_append(LOC,size);
s = str_append(LOC," stack frames:\n");
#define DUMP(FP) { \
#define DUMP(FD) { \
if (program_counter) \
{ \
write(fileno(FP),pclabel,sizeof(pclabel)-1); \
backtrace_symbols_fd(&program_counter, 1, fileno(FP)); \
write(FD, pclabel, sizeof(pclabel)-1); \
backtrace_symbols_fd(&program_counter, 1, FD); \
} \
write(fileno(FP),buf,s-buf); \
backtrace_symbols_fd(array, size, fileno(FP)); \
write(FD, buf, s-buf); \
backtrace_symbols_fd(array, size, FD); \
}
if (crashlog_fd >= 0)
DUMP(crashlog_fd)
if (!zlog_default)
DUMP(stderr)
DUMP(fileno(stderr))
else
{
if ((priority <= zlog_default->maxlvl[ZLOG_DEST_FILE]) &&
zlog_default->fp)
DUMP(zlog_default->fp)
DUMP(fileno(zlog_default->fp))
if (priority <= zlog_default->maxlvl[ZLOG_DEST_STDOUT])
DUMP(stdout)
DUMP(fileno(stdout))
/* Remove trailing '\n' for monitor and syslog */
*--s = '\0';
if (priority <= zlog_default->maxlvl[ZLOG_DEST_MONITOR])
@ -493,9 +533,21 @@ void
_zlog_assert_failed (const char *assertion, const char *file,
unsigned int line, const char *function)
{
zlog_err("Assertion `%s' failed in file %s, line %u, function %s",
assertion,file,line,(function ? function : "?"));
zlog_backtrace(LOG_ERR);
if (zlog_default && !zlog_default->fp)
{
/* Force fallback file logging. */
int fd;
FILE *fp;
if (((fd = open_crashlog()) >= 0) && ((fp = fdopen(fd, "w")) != NULL))
{
zlog_default->fp = fp;
zlog_default->maxlvl[ZLOG_DEST_FILE] = LOG_ERR;
}
}
zlog(NULL, LOG_CRIT, "Assertion `%s' failed in file %s, line %u, function %s",
assertion,file,line,(function ? function : "?"));
zlog_backtrace(LOG_CRIT);
abort();
}