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logging: don't write fatal messages to invalid descriptor

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If opening the log file specified with the -l option failed (after
closing all descriptors), the error message is written to an invalid
descriptor as no log file or syslog is opened yet. Fix the code to track
when the output is usable.
This commit is contained in:
Miroslav Lichvar
2018-02-21 12:40:53 +01:00
parent 4da9f74d24
commit 7b98443a13
2 changed files with 16 additions and 16 deletions
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30
logging.c
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@@ -79,11 +79,11 @@ LOG_Initialise(void)
void
LOG_Finalise(void)
{
if (system_log) {
if (system_log)
closelog();
} else {
if (file_log)
fclose(file_log);
}
LOG_CycleLogFiles();
@@ -116,7 +116,7 @@ static void log_message(int fatal, LOG_Severity severity, const char *message)
assert(0);
}
syslog(priority, fatal ? "Fatal error : %s" : "%s", message);
} else {
} else if (file_log) {
fprintf(file_log, fatal ? "Fatal error : %s\n" : "%s\n", message);
}
}
@@ -134,7 +134,7 @@ void LOG_Message(LOG_Severity severity,
time_t t;
struct tm stm;
if (!system_log) {
if (!system_log && file_log) {
/* Don't clutter up syslog with timestamps and internal debugging info */
time(&t);
stm = *gmtime(&t);
@@ -160,16 +160,14 @@ void LOG_Message(LOG_Severity severity,
case LOGS_FATAL:
log_message(1, severity, buf);
/* With syslog, send the message also to the grandparent
process or write it to stderr if not detached */
if (system_log) {
if (parent_fd > 0) {
if (write(parent_fd, buf, strlen(buf) + 1) < 0)
; /* Not much we can do here */
} else if (parent_fd == 0) {
system_log = 0;
log_message(1, severity, buf);
}
/* Send the message also to the foreground process if it is
still running, or stderr if it is still open */
if (parent_fd > 0) {
if (write(parent_fd, buf, strlen(buf) + 1) < 0)
; /* Not much we can do here */
} else if (system_log && parent_fd == 0) {
system_log = 0;
log_message(1, severity, buf);
}
break;
default:
@@ -220,6 +218,8 @@ void
LOG_SetParentFd(int fd)
{
parent_fd = fd;
if (file_log == stderr)
file_log = NULL;
}
/* ================================================== */