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Log message before aborting

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Log message before aborting due to watchdog timeout. We have to use
async-safe write to debug log, as it is done in signal handler.

Minor changes from committer.
This commit is contained in:
Mike Crute 2023-01-12 17:40:53 +01:00 committed by Ondrej Zajicek
parent e20bef69cc
commit 64a2b7aaa3
3 changed files with 25 additions and 0 deletions
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1
lib/birdlib.h
View File

@ -160,6 +160,7 @@ void bug(const char *msg, ...) NORET;
#define L_BUG "\011" /* BIRD bugs */
void debug(const char *msg, ...); /* Printf to debug output */
void debug_safe(const char *msg); /* Printf to debug output, async-safe */
/* Debugging */

2
sysdep/unix/io.c
View File

@ -2128,6 +2128,8 @@ watchdog_sigalrm(int sig UNUSED)
config->latency_limit = 0xffffffff;
io_update_time();
debug_safe("Watchdog timer timed out\n");
/* We want core dump */
abort();
}

22
sysdep/unix/log.c
View File

@ -31,6 +31,7 @@
#include "lib/lists.h"
#include "sysdep/unix/unix.h"
static int dbg_fd = -1;
static FILE *dbgf;
static list *current_log_list;
static char *current_syslog_name; /* NULL -> syslog closed */
@ -324,6 +325,21 @@ debug(const char *msg, ...)
va_end(args);
}
/**
* debug_safe - async-safe write to debug output
* @msg: a string message
*
* This function prints the message @msg to the debugging output in a
* way that is async safe and can be used in signal handlers. No newline
* character is appended.
*/
void
debug_safe(const char *msg)
{
if (dbg_fd >= 0)
write(dbg_fd, msg, strlen(msg));
}
static list *
default_log_list(int initial, const char **syslog_name)
{
@ -422,8 +438,10 @@ done:
void
log_init_debug(char *f)
{
dbg_fd = -1;
if (dbgf && dbgf != stderr)
fclose(dbgf);
if (!f)
dbgf = NULL;
else if (!*f)
@ -434,6 +452,10 @@ log_init_debug(char *f)
fprintf(stderr, "bird: Unable to open debug file %s: %s\n", f, strerror(errno));
exit(1);
}
if (dbgf)
{
setvbuf(dbgf, NULL, _IONBF, 0);
dbg_fd = fileno(dbgf);
}
}