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

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* log.c: (zlog_signal,zlog_backtrace_sigsafe) Eliminate use of fileno()
	  since it is not async-signal-safe.
	  (_zlog_assert_failed) Rewrite crashlog logic more compactly.
	  (zlog_set_file,zlog_reset_file,zlog_rotate) Update logfile_fd
	  for use in signal handler.
This commit is contained in:
ajs 2005-02-03 19:22:05 +00:00
parent c70257d0af
commit c4c7d0c48b
2 changed files with 27 additions and 29 deletions
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8
lib/ChangeLog
View File

@ -1,3 +1,11 @@
2005-02-03 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* log.c: (zlog_signal,zlog_backtrace_sigsafe) Eliminate use of fileno()
since it is not async-signal-safe.
(_zlog_assert_failed) Rewrite crashlog logic more compactly.
(zlog_set_file,zlog_reset_file,zlog_rotate) Update logfile_fd
for use in signal handler.
2005-02-03 Andrew J. Schorr <ajschorr@alumni.princeton.edu>
* log.c: (syslog_sigsafe) Reduce scope of syslog_fd: it is accessed

48
lib/log.c
View File

@ -1,5 +1,5 @@
/*
* $Id: log.c,v 1.24 2005/02/03 16:42:40 ajs Exp $
* $Id: log.c,v 1.25 2005/02/03 19:22:05 ajs Exp $
*
* Logging of zebra
* Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
@ -31,8 +31,7 @@
#include <sys/un.h>
#endif
static int crashlog_fd = -1; /* Used for last-resort crash logfile when a
signal is caught. */
static int logfile_fd = -1; /* Used in signal handler. */
struct zlog *zlog_default = NULL;
@ -339,17 +338,14 @@ zlog_signal(int signo, const char *action
#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 ((logfile_fd >= 0) || ((logfile_fd = open_crashlog()) >= 0))
DUMP(logfile_fd)
if (!zlog_default)
DUMP(fileno(stderr))
DUMP(STDERR_FILENO)
else
{
if ((PRI <= zlog_default->maxlvl[ZLOG_DEST_FILE]) && zlog_default->fp)
DUMP(fileno(zlog_default->fp))
if (PRI <= zlog_default->maxlvl[ZLOG_DEST_STDOUT])
DUMP(fileno(stdout))
DUMP(STDOUT_FILENO)
/* Remove trailing '\n' for monitor and syslog */
*--s = '\0';
if (PRI <= zlog_default->maxlvl[ZLOG_DEST_MONITOR])
@ -401,17 +397,14 @@ zlog_backtrace_sigsafe(int priority, void *program_counter)
backtrace_symbols_fd(array, size, FD); \
}
if (crashlog_fd >= 0)
DUMP(crashlog_fd)
if ((logfile_fd >= 0) || ((logfile_fd = open_crashlog()) >= 0))
DUMP(logfile_fd)
if (!zlog_default)
DUMP(fileno(stderr))
DUMP(STDERR_FILENO)
else
{
if ((priority <= zlog_default->maxlvl[ZLOG_DEST_FILE]) &&
zlog_default->fp)
DUMP(fileno(zlog_default->fp))
if (priority <= zlog_default->maxlvl[ZLOG_DEST_STDOUT])
DUMP(fileno(stdout))
DUMP(STDOUT_FILENO)
/* Remove trailing '\n' for monitor and syslog */
*--s = '\0';
if (priority <= zlog_default->maxlvl[ZLOG_DEST_MONITOR])
@ -533,18 +526,11 @@ void
_zlog_assert_failed (const char *assertion, const char *file,
unsigned int line, const char *function)
{
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;
}
}
/* Force fallback file logging? */
if (zlog_default && !zlog_default->fp &&
((logfile_fd = open_crashlog()) >= 0) &&
((zlog_default->fp = fdopen(logfile_fd, "w")) != NULL))
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);
@ -621,6 +607,7 @@ zlog_set_file (struct zlog *zl, const char *filename, int log_level)
zl->filename = strdup (filename);
zl->maxlvl[ZLOG_DEST_FILE] = log_level;
zl->fp = fp;
logfile_fd = fileno(fp);
return 1;
}
@ -635,6 +622,7 @@ zlog_reset_file (struct zlog *zl)
if (zl->fp)
fclose (zl->fp);
zl->fp = NULL;
logfile_fd = -1;
zl->maxlvl[ZLOG_DEST_FILE] = ZLOG_DISABLED;
if (zl->filename)
@ -656,6 +644,7 @@ zlog_rotate (struct zlog *zl)
if (zl->fp)
fclose (zl->fp);
zl->fp = NULL;
logfile_fd = -1;
level = zl->maxlvl[ZLOG_DEST_FILE];
zl->maxlvl[ZLOG_DEST_FILE] = ZLOG_DISABLED;
@ -674,6 +663,7 @@ zlog_rotate (struct zlog *zl)
zl->filename, safe_strerror(save_errno));
return -1;
}
logfile_fd = fileno(zl->fp);
zl->maxlvl[ZLOG_DEST_FILE] = level;
}