#ifndef _USTERR_SIGNAL_SAFE_H
#define _USTERR_SIGNAL_SAFE_H
/*
* Copyright (C) 2009 Pierre-Marc Fournier
* Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1 of
* the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <sys/types.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <share.h>
#include "lttng/ust-tid.h"
enum ust_loglevel {
UST_LOGLEVEL_UNKNOWN = 0,
UST_LOGLEVEL_NORMAL,
UST_LOGLEVEL_DEBUG,
};
extern volatile enum ust_loglevel ust_loglevel;
void init_usterr(void);
#ifdef LTTNG_UST_DEBUG
static inline int ust_debug(void)
{
return 1;
}
#else /* #ifdef LTTNG_UST_DEBUG */
static inline int ust_debug(void)
{
return ust_loglevel == UST_LOGLEVEL_DEBUG;
}
#endif /* #else #ifdef LTTNG_UST_DEBUG */
#ifndef UST_COMPONENT
//#error UST_COMPONENT is undefined
#define UST_COMPONENT libust
#endif
/* To stringify the expansion of a define */
#define UST_XSTR(d) UST_STR(d)
#define UST_STR(s) #s
#define USTERR_MAX_LEN 512
/* We sometimes print in the tracing path, and tracing can occur in
* signal handlers, so we must use a print method which is signal safe.
*/
extern int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...)
__attribute__ ((format (printf, 3, 4)));
static inline void __attribute__ ((format (printf, 1, 2)))
__check_ust_safe_fmt(const char *fmt, ...)
{
}
/* Can't use dynamic allocation. Limit ourselves to USTERR_MAX_LEN chars. */
/* Add end of string in case of buffer overflow. */
#define sigsafe_print_err(fmt, args...) \
do { \
if (ust_debug()) { \
char ____buf[USTERR_MAX_LEN]; \
int ____saved_errno; \
\
____saved_errno = errno; /* signal-safety */ \
ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \
____buf[sizeof(____buf) - 1] = 0; \
patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
errno = ____saved_errno; /* signal-safety */ \
fflush(stderr); \
} \
} while (0)
#define UST_STR_COMPONENT UST_XSTR(UST_COMPONENT)
#define ERRMSG(fmt, args...) \
do { \
sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" UST_XSTR(__LINE__) ")\n", \
(long) getpid(), \
(long) gettid(), \
## args, __func__); \
} while(0)
#define DBG(fmt, args...) ERRMSG(fmt, ## args)
#define DBG_raw(fmt, args...) sigsafe_print_err(fmt, ## args)
#define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
#define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
#define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
#if !defined(__GLIBC__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE))
/*
* Version using XSI strerror_r.
*/
#define PERROR(call, args...) \
do { \
if (ust_debug()) { \
char buf[200] = "Error in strerror_r()"; \
strerror_r(errno, buf, sizeof(buf)); \
ERRMSG("Error: " call ": %s", ## args, buf); \
} \
} while(0)
#else
/*
* Version using GNU strerror_r, for linux with appropriate defines.
*/
#define PERROR(call, args...) \
do { \
if (ust_debug()) { \
char *buf; \
char tmp[200]; \
buf = strerror_r(errno, tmp, sizeof(tmp)); \
ERRMSG("Error: " call ": %s", ## args, buf); \
} \
} while(0)
#endif
#define BUG_ON(condition) \
do { \
if (caa_unlikely(condition)) \
ERR("condition not respected (BUG) on line %s:%d", __FILE__, __LINE__); \
} while(0)
#define WARN_ON(condition) \
do { \
if (caa_unlikely(condition)) \
WARN("condition not respected on line %s:%d", __FILE__, __LINE__); \
} while(0)
#define WARN_ON_ONCE(condition) WARN_ON(condition)
#endif /* _USTERR_SIGNAL_SAFE_H */