1 /* Copyright (C) 2009 Pierre-Marc Fournier
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 #ifndef _USTERR_SIGNAL_SAFE_H
19 #define _USTERR_SIGNAL_SAFE_H
22 #include <sys/types.h>
23 #include <sys/syscall.h>
33 //#error UST_COMPONENT is undefined
34 #define UST_COMPONENT libust
37 /* To stringify the expansion of a define */
38 #define XSTR(d) STR(d)
41 /* We sometimes print in the tracing path, and tracing can occur in
42 * signal handlers, so we must use a print method which is signal safe.
45 extern int ust_safe_snprintf(char *str
, size_t n
, const char *fmt
, ...)
46 __attribute__ ((format (printf
, 3, 4)));
48 static inline void __attribute__ ((format (printf
, 1, 2)))
49 __check_ust_safe_fmt(const char *fmt
, ...)
53 #define sigsafe_print_err(fmt, args...) \
55 /* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \
57 int ____saved_errno; \
59 /* Save the errno. */ \
60 ____saved_errno = errno; \
62 ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \
64 /* Add end of string in case of buffer overflow. */ \
65 ____buf[sizeof(____buf)-1] = 0; \
67 patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \
68 /* Can't print errors because we are in the error printing code path. */ \
70 /* Restore errno, in order to be async-signal safe. */ \
71 errno = ____saved_errno; \
74 #define UST_STR_COMPONENT XSTR(UST_COMPONENT)
76 #define ERRMSG(fmt, args...) do { sigsafe_print_err(UST_STR_COMPONENT "[%ld/%ld]: " fmt " (in %s() at " __FILE__ ":" XSTR(__LINE__) ")\n", (long) getpid(), (long) syscall(SYS_gettid), ## args, __func__); fflush(stderr); } while(0)
79 # define DBG(fmt, args...) ERRMSG(fmt, ## args)
80 # define DBG_raw(fmt, args...) do { sigsafe_print_err(fmt, ## args); fflush(stderr); } while(0)
82 # define DBG(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
83 # define DBG_raw(fmt, args...) __check_ust_safe_fmt(fmt, ## args)
85 #define WARN(fmt, args...) ERRMSG("Warning: " fmt, ## args)
86 #define ERR(fmt, args...) ERRMSG("Error: " fmt, ## args)
87 #define BUG(fmt, args...) ERRMSG("BUG: " fmt, ## args)
89 #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE)
90 #define PERROR(call, args...)\
92 char buf[200] = "Error in strerror_r()"; \
93 strerror_r(errno, buf, sizeof(buf)); \
94 ERRMSG("Error: " call ": %s", ## args, buf); \
97 #define PERROR(call, args...)\
101 buf = strerror_r(errno, tmp, sizeof(tmp)); \
102 ERRMSG("Error: " call ": %s", ## args, buf); \
106 #define BUG_ON(condition) do { if (unlikely(condition)) ERR("condition not respected (BUG)"); } while(0)
107 #define WARN_ON(condition) do { if (unlikely(condition)) WARN("condition not respected on line %s:%d", __FILE__, __LINE__); } while(0)
108 #define WARN_ON_ONCE(condition) WARN_ON(condition)
110 #endif /* _USTERR_SIGNAL_SAFE_H */
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