nginx/src/core/ngx_log.c

/*
   TODO: log pid and tid
*/

/*
   "[time as ctime()] [alert] 412:3 (32)Broken pipe: anything"

   "[time as ctime()] [alert] (32)Broken pipe: anything"
   "[time as ctime()] [alert] anything"
*/

#include <ngx_config.h>
#include <ngx_errno.h>
#include <ngx_time.h>
#include <ngx_string.h>
#include <ngx_log.h>


static const char *err_levels[] = {
    "emerg", "alert", "crit", "error", "warn", "notice", "info", "debug"
};

#if (HAVE_VARIADIC_MACROS)
void ngx_log_error_core(int level, ngx_log_t *log, ngx_err_t err,
                        const char *fmt, ...)
#else
void ngx_log_error_core(int level, ngx_log_t *log, ngx_err_t err,
                        const char *fmt, va_list args)
#endif
{
    char       errstr[MAX_ERROR_STR];
    ngx_tm_t   tm;
    size_t     len;
#if (HAVE_VARIADIC_MACROS)
    va_list    args;
#endif

    ngx_localtime(&tm);
    len = ngx_snprintf(errstr, sizeof(errstr), "%02d:%02d:%02d",
                       tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec);

    if (err) {
        if ((unsigned) err < 0x80000000)
            len += ngx_snprintf(errstr + len, sizeof(errstr) - len - 1,
                            " [%s] (%d)",
                            err_levels[level], err);
        else
            len += ngx_snprintf(errstr + len, sizeof(errstr) - len - 1,
                            " [%s] (%X)",
                            err_levels[level], err);

        len += ngx_strerror_r(err, errstr + len, sizeof(errstr) - len - 1);
        if (len < sizeof(errstr) - 2) {
            errstr[len++] = ':';
            errstr[len++] = ' ';
        } else {
            len = sizeof(errstr) - 2;
        }

    } else {
        len += ngx_snprintf(errstr + len, sizeof(errstr) - len - 1,
                            " [%s] ", err_levels[level]);
    }

#if (HAVE_VARIADIC_MACROS)
    va_start(args, fmt);
    len += ngx_vsnprintf(errstr + len, sizeof(errstr) - len - 1, fmt, args);
    va_end(args);
#else
    len += ngx_vsnprintf(errstr + len, sizeof(errstr) - len - 1, fmt, args);
#endif

    if (len > sizeof(errstr) - 2)
        len = sizeof(errstr) - 2;
    errstr[len] = '\n';
    errstr[len + 1] = '\0';

    fputs(errstr, stderr);

    if (level == NGX_LOG_EMERG)
        exit(1);
}

#if !(HAVE_VARIADIC_MACROS)

void ngx_log_error(int level, ngx_log_t *log, ngx_err_t err,
                   const char *fmt, ...)
{
    va_list    args;

    if (log->log_level >= level) {
        va_start(args, fmt);
        ngx_log_error_core(level, log, err, fmt, args);
        va_end(args);
    }
}

void ngx_log_debug_core(ngx_log_t *log, const char *fmt, ...)
{
    va_list    args;

    va_start(args, fmt);
    ngx_log_error_core(NGX_LOG_DEBUG, log, 0, fmt, args);
    va_end(args);
}

void ngx_assert_core(ngx_log_t *log, const char *fmt, ...)
{
    va_list    args;

    va_start(args, fmt);
    ngx_log_error_core(NGX_LOG_ALERT, log, 0, fmt, args);
    va_end(args);
}

#endif