/**
* log_msg - Write log message into lp_diag log file
*
* @fmt format string to printf()
* @... additional argument
*/
void
log_msg(const char *fmt, ...)
{
int rc;
int len = 0;
char buf[LP_ERROR_LOG_MAX];
va_list ap;
#ifndef LPD_DEBUG
/* In order to make testing easier we will not print time in
* debug version of lp_diag.
*/
if (lp_error_log_fd != STDOUT_FILENO) {
len = insert_time(buf, LP_ERROR_LOG_MAX);
len += snprintf(buf + len, LP_ERROR_LOG_MAX - len, ": ");
}
#endif
/* Add the actual message */
va_start(ap, fmt);
len += vsnprintf(buf + len, LP_ERROR_LOG_MAX - len, fmt, ap);
if (len < 0 || len >= LP_ERROR_LOG_MAX) {
dbg("Insufficient buffer size");
va_end(ap);
return;
}
va_end(ap);
/* Add ending punctuation */
len += snprintf(buf + len, LP_ERROR_LOG_MAX - len, ".");
if (lp_error_log_fd == -1) {
dbg("Log file \"%s\" is not available", lp_error_log_file);
_dbg(buf);
return;
}
_dbg(buf);
/* reformat the new message */
len = reformat_msg(buf, LP_ERROR_LOG_MAX);
rc = write(lp_error_log_fd, buf, len);
if (rc == -1)
dbg("Write to log file \"%s\" failed", lp_error_log_file);
}
/**
* dbg
* @brief Write debug messages to stdout
*
* Provide utility to print debug statements if the debug flag
* is specified.
*
* @param fmt format string a la printf()
* @param ... args a la printf()
*/
void
_dbg(const char *fmt, ...)
{
va_list ap;
char buf[RTAS_ERROR_LOG_MAX + 8];
int len;
if (debug == 0)
return;
memset(buf, 0, sizeof(buf));
va_start(ap, fmt);
len = sprintf(buf, "DEBUG: ");
len += vsnprintf(buf + len, RTAS_ERROR_LOG_MAX, fmt, ap);
buf[len] = '\0';
va_end(ap);
len = reformat_msg(buf);
fprintf(stdout, "%s", buf);
fflush(stdout);
}
/**
* _log_msg
* @brief The real routine to write messages to rtas_errd_log
*
* This is a common routine for formatting messages that go to the
* /var/log/rtas_errd.log file. Users should pass in a reference to
* the rtas_event structure if this message is directly related a rtas
* event and a formatted message a la printf() style. Please make sure
* that the message passed in does not have any ending punctuation or
* ends with a newline. It sould also not have any internal newlines.
*
* This routine will do several things to the message before printing
* it out;
* - Add a timestamp
* - If a rtas_event reference is passed in, a sequenbce number is added
* - If errno is set, the results of perror are added.
* - The entire message is then formatted to fit in 80 cols.
*
* @param event reference to event
* @param fmt formatted string a la printf()
* @param ... additional args a la printf()
*/
static void
_log_msg(struct event *event, const char *fmt, va_list ap)
{
struct stat sbuf;
char buf[RTAS_ERROR_LOG_MAX];
int len = 0, rc;
if (rtas_errd_log_fd == -1) {
dbg("rtas_errd log file is not available");
vsprintf(buf, fmt, ap);
_dbg(buf);
return;
}
#ifndef DEBUG
{
time_t cal;
/* In order to make testing easier we don't print the date
* to the log file for debug versions of rtas_errd. This helps
* avoid lots of ugly date munging when comparing files.
*/
cal = time(NULL);
len = sprintf(buf, "%s ", ctime(&cal));
}
#endif
/* Add the sequence number */
if (event)
len += sprintf(buf, "(Sequence #%d) ",
event->seq_num);
/* Add the actual message */
len += vsprintf(buf + len, fmt, ap);
/* Add ending punctuation */
len += sprintf(buf + len, ".");
_dbg(buf);
/* reformat the new message */
len = reformat_msg(buf);
rc = write(rtas_errd_log_fd, buf, len);
if (rc == -1)
dbg("rtas_errd: write to rtas_errd log failed");
/* After each write check to see if we need to to do log rotation */
rc = fstat(rtas_errd_log_fd, &sbuf);
if (rc == -1) {
dbg("rtas_errd: Cannot stat rtas_errd log file "
"to rotate logs");
return;
}
if (sbuf.st_size >= RTAS_ERRD_LOGSZ) {
char cmd_buf[1024];
int rc;
int8_t status;
close(rtas_errd_log_fd);
memset(cmd_buf, 0, 1024);
sprintf(cmd_buf, "rm -f %s; mv %s %s", rtas_errd_log0,
rtas_errd_log, rtas_errd_log0);
rc = system(cmd_buf);
if (rc == -1) {
status = WEXITSTATUS(rc);
log_msg(NULL, "An error occured during the rotation of "
"the rtas_errd logs:\n cmd = %s\nexit status: "
"%d)", cmd_buf, status);
}
rtas_errd_log_fd = open(rtas_errd_log,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP);
if (rtas_errd_log_fd == -1)
dbg("Could not re-open %s", rtas_errd_log);
}
return;
}
/**
* _log_msg
* @brief The real routine to write messages to rtas_errd_log
*
* This is a common routine for formatting messages that go to the
* /var/log/rtas_errd.log file. Users should pass in a reference to
* the rtas_event structure if this message is directly related a rtas
* event and a formatted message a la printf() style. Please make sure
* that the message passed in does not have any ending punctuation or
* ends with a newline. It sould also not have any internal newlines.
*
* This routine will do several things to the message before printing
* it out;
* - Add a timestamp
* - If a rtas_event reference is passed in, a sequenbce number is added
* - If errno is set, the results of perror are added.
* - The entire message is then formatted to fit in 80 cols.
*
* @param event reference to event
* @param fmt formatted string a la printf()
* @param ... additional args a la printf()
*/
static void
_log_msg(struct event *event, const char *fmt, va_list ap)
{
struct stat sbuf;
char buf[RTAS_ERROR_LOG_MAX];
int len = 0, rc;
char *dir_name;
char *rtas_errd_log_c; /* Both rtas_errd_log/rtas_errd_log0 are
global, so make a copy. */
if (rtas_errd_log_fd == -1) {
dbg("rtas_errd log file is not available");
vsprintf(buf, fmt, ap);
_dbg(buf);
return;
}
#ifndef DEBUG
{
time_t cal;
/* In order to make testing easier we don't print the date
* to the log file for debug versions of rtas_errd. This helps
* avoid lots of ugly date munging when comparing files.
*/
cal = time(NULL);
len = sprintf(buf, "%s ", ctime(&cal));
}
#endif
/* Add the sequence number */
if (event)
len += sprintf(buf, "(Sequence #%d) ",
event->seq_num);
/* Add the actual message */
len += vsprintf(buf + len, fmt, ap);
/* Add ending punctuation */
len += sprintf(buf + len, ".");
_dbg(buf);
/* reformat the new message */
len = reformat_msg(buf);
rc = write(rtas_errd_log_fd, buf, len);
if (rc == -1)
dbg("rtas_errd: write to rtas_errd log failed");
/* After each write check to see if we need to to do log rotation */
rc = fstat(rtas_errd_log_fd, &sbuf);
if (rc == -1) {
dbg("rtas_errd: Cannot stat rtas_errd log file "
"to rotate logs");
return;
}
if (sbuf.st_size >= RTAS_ERRD_LOGSZ) {
int rc; /* return code */
struct stat log_file; /* file stat */
int dir_fd; /* fsync */
close(rtas_errd_log_fd);
/*
* Remove log file /var/log/rtas_errd.log0
*/
rc = stat(rtas_errd_log0, &log_file);
if (rc == 0) {
rc = unlink(rtas_errd_log0);
if (rc == -1) {
log_msg(NULL, "An error occured during the "
"rotation of the rtas_errd logs:\n "
"cmd = rm %s\nexit status: %d)",
rtas_errd_log0, errno);
}
} /* stat */
/*
* rotate /var/log/rtas_errd.log to /var/log/rtas_errd.log0
*/
rc = rename(rtas_errd_log, rtas_errd_log0);
if (rc == -1) {
log_msg(NULL, "An error occured during rotation of "
"rtas_errd logs (logger alive):\n cmd = rename"
" %s %s\nexit status: %d)", rtas_errd_log,
rtas_errd_log0, errno);
}
/*
* fsync /var/log/ to be on safer side.
*/
rtas_errd_log_c = strdup(rtas_errd_log);
if (!rtas_errd_log_c) {
log_msg(NULL, "%s, Memory allocation failed, %s",
__func__, strerror(errno));
rtas_errd_log_fd = -1;
dbg("Could not re-open %s", rtas_errd_log);
return;
}
dir_name = dirname(rtas_errd_log_c);
dir_fd = open(dir_name, O_RDONLY|O_DIRECTORY);
rc = fsync(dir_fd);
if (rc == -1) {
log_msg(NULL, "fsync failed, on %s\nexit status: %d",
dir_name, errno);
}
close(dir_fd);
rtas_errd_log_fd = open(rtas_errd_log,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP);
if (rtas_errd_log_fd == -1)
dbg("Could not re-open %s", rtas_errd_log);
}
return;
}
