diff options
Diffstat (limited to 'source3/lib')
| -rw-r--r-- | source3/lib/debug.c | 134 |
1 files changed, 83 insertions, 51 deletions
diff --git a/source3/lib/debug.c b/source3/lib/debug.c index 27fa80ca3f..9c97385db3 100644 --- a/source3/lib/debug.c +++ b/source3/lib/debug.c @@ -82,6 +82,7 @@ FILE *dbf = NULL; pstring debugf = ""; BOOL append_log = False; + int DEBUGLEVEL_CLASS[DBGC_LAST]; int DEBUGLEVEL = DEBUGLEVEL_CLASS; @@ -105,6 +106,12 @@ int DEBUGLEVEL = DEBUGLEVEL_CLASS; * to build the formatted output. * * format_pos - Marks the first free byte of the format_bufr. + * + * + * log_overflow - When this variable is True, never attempt to check the + * size of the log. This is a hack, so that we can write + * a message using DEBUG, from open_logs() when we + * are unable to open a new log file for some reason. */ static BOOL stdout_logging = False; @@ -114,6 +121,7 @@ static int syslog_level = 0; #endif static pstring format_bufr = { '\0' }; static size_t format_pos = 0; +static BOOL log_overflow = False; /* * Define all the debug class selection names here. Names *MUST NOT* contain @@ -289,19 +297,25 @@ void setup_logging(char *pname, BOOL interactive) /* ************************************************************************** ** * reopen the log files * note that we now do this unconditionally + * We attempt to open the new debug fp before closing the old. This means + * if we run out of fd's we just keep using the old fd rather than aborting. + * Fix from dgibson@linuxcare.com. * ************************************************************************** ** */ -void reopen_logs( void ) + +BOOL reopen_logs( void ) { pstring fname; mode_t oldumask; + FILE *new_dbf = NULL; + BOOL ret = True; if (DEBUGLEVEL_CLASS[ DBGC_ALL ] <= 0) { if (dbf) { (void)fclose(dbf); dbf = NULL; } - return; + return True; } oldumask = umask( 022 ); @@ -311,22 +325,33 @@ void reopen_logs( void ) pstrcpy(fname, lp_logfile()); pstrcpy( debugf, fname ); - if (dbf) - (void)fclose(dbf); if (append_log) - dbf = sys_fopen( debugf, "a" ); + new_dbf = sys_fopen( debugf, "a" ); else - dbf = sys_fopen( debugf, "w" ); + new_dbf = sys_fopen( debugf, "w" ); + + if (!new_dbf) { + log_overflow = True; + DEBUG(0, ("Unable to open new log file %s: %s\n", debugf, strerror(errno))); + log_overflow = False; + fflush(dbf); + ret = False; + } else { + setbuf(new_dbf, NULL); + if (dbf) + (void) fclose(dbf); + dbf = new_dbf; + } + /* Fix from klausr@ITAP.Physik.Uni-Stuttgart.De * to fix problem where smbd's that generate less * than 100 messages keep growing the log. */ force_check_log_size(); - if (dbf) - setbuf( dbf, NULL ); (void)umask(oldumask); -} + return ret; +} /* ************************************************************************** ** * Force a check of the log size. @@ -363,54 +388,61 @@ BOOL need_to_check_log_size( void ) void check_log_size( void ) { - int maxlog; - SMB_STRUCT_STAT st; + int maxlog; + SMB_STRUCT_STAT st; - /* - * We need to be root to check/change log-file, skip this and let the main - * loop check do a new check as root. - */ + /* + * We need to be root to check/change log-file, skip this and let the main + * loop check do a new check as root. + */ - if( geteuid() != 0 ) - return; + if( geteuid() != 0 ) + return; - if( !need_to_check_log_size() ) - return; + if(log_overflow || !need_to_check_log_size() ) + return; - maxlog = lp_max_log_size() * 1024; + maxlog = lp_max_log_size() * 1024; - if( sys_fstat( fileno( dbf ), &st ) == 0 && st.st_size > maxlog ) - { - (void)fclose( dbf ); - dbf = NULL; - reopen_logs(); - if( dbf && get_file_size( debugf ) > maxlog ) - { - pstring name; + if( sys_fstat( fileno( dbf ), &st ) == 0 && st.st_size > maxlog ) { + (void)reopen_logs(); + if( dbf && get_file_size( debugf ) > maxlog ) { + pstring name; - (void)fclose( dbf ); - dbf = NULL; - slprintf( name, sizeof(name)-1, "%s.old", debugf ); - (void)rename( debugf, name ); - reopen_logs(); - } - } - /* - * Here's where we need to panic if dbf == NULL.. - */ - if(dbf == NULL) { - dbf = sys_fopen( "/dev/console", "w" ); - if(dbf) { - DEBUG(0,("check_log_size: open of debug file %s failed - using console.\n", - debugf )); - } else { - /* - * We cannot continue without a debug file handle. - */ - abort(); - } - } - debug_count = 0; + slprintf( name, sizeof(name)-1, "%s.old", debugf ); + (void)rename( debugf, name ); + + if (!reopen_logs()) { + /* We failed to reopen a log - continue using the old name. */ + (void)rename(name, debugf); + } + } + } + + /* + * Here's where we need to panic if dbf == NULL.. + */ + + if(dbf == NULL) { + /* This code should only be reached in very strange + circumstances. If we merely fail to open the new log we + should stick with the old one. ergo this should only be + reached when opening the logs for the first time: at + startup or when the log level is increased from zero. + -dwg 6 June 2000 + */ + dbf = sys_fopen( "/dev/console", "w" ); + if(dbf) { + DEBUG(0,("check_log_size: open of debug file %s failed - using console.\n", + debugf )); + } else { + /* + * We cannot continue without a debug file handle. + */ + abort(); + } + } + debug_count = 0; } /* check_log_size */ /* ************************************************************************** ** |