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1 | /* Copyright (C) 2009 Pierre-Marc Fournier |
2 | * | |
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. | |
7 | * | |
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. | |
12 | * | |
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 | |
16 | */ | |
17 | ||
18 | #ifndef _USTERR_SIGNAL_SAFE_H | |
19 | #define _USTERR_SIGNAL_SAFE_H | |
20 | ||
21 | #include <string.h> | |
22 | #include <sys/types.h> | |
23 | #include <sys/syscall.h> | |
24 | #include <errno.h> | |
25 | #include <stdarg.h> | |
26 | #include <stdio.h> | |
27 | ||
28 | #include <ust/core.h> | |
29 | ||
30 | #include "share.h" | |
31 | ||
32 | #ifndef UST_COMPONENT | |
33 | //#error UST_COMPONENT is undefined | |
34 | #define UST_COMPONENT libust | |
35 | #endif | |
36 | ||
37 | /* To stringify the expansion of a define */ | |
38 | #define XSTR(d) STR(d) | |
39 | #define STR(s) #s | |
40 | ||
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. | |
43 | */ | |
44 | ||
45 | extern int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...) | |
46 | __attribute__ ((format (printf, 3, 4))); | |
47 | ||
48 | static inline void __attribute__ ((format (printf, 1, 2))) | |
49 | __check_ust_safe_fmt(const char *fmt, ...) | |
50 | { | |
51 | } | |
52 | ||
53 | #define sigsafe_print_err(fmt, args...) \ | |
54 | { \ | |
55 | /* Can't use dynamic allocation. Limit ourselves to 250 chars. */ \ | |
56 | char ____buf[250]; \ | |
57 | int ____saved_errno; \ | |
58 | \ | |
59 | /* Save the errno. */ \ | |
60 | ____saved_errno = errno; \ | |
61 | \ | |
62 | ust_safe_snprintf(____buf, sizeof(____buf), fmt, ## args); \ | |
63 | \ | |
64 | /* Add end of string in case of buffer overflow. */ \ | |
a6352fd4 | 65 | ____buf[sizeof(____buf) - 1] = 0; \ |
30ffe279 NC |
66 | \ |
67 | patient_write(STDERR_FILENO, ____buf, strlen(____buf)); \ | |
68 | /* Can't print errors because we are in the error printing code path. */ \ | |
69 | \ | |
70 | /* Restore errno, in order to be async-signal safe. */ \ | |
71 | errno = ____saved_errno; \ | |
72 | } | |
73 | ||
74 | #define UST_STR_COMPONENT XSTR(UST_COMPONENT) | |
75 | ||
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) | |
77 | ||
78 | #ifdef UST_DEBUG | |
79 | # define DBG(fmt, args...) ERRMSG(fmt, ## args) | |
80 | # define DBG_raw(fmt, args...) do { sigsafe_print_err(fmt, ## args); fflush(stderr); } while(0) | |
81 | #else | |
82 | # define DBG(fmt, args...) __check_ust_safe_fmt(fmt, ## args) | |
83 | # define DBG_raw(fmt, args...) __check_ust_safe_fmt(fmt, ## args) | |
84 | #endif | |
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) | |
88 | ||
89 | #if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !defined(_GNU_SOURCE) | |
90 | #define PERROR(call, args...)\ | |
91 | do { \ | |
92 | char buf[200] = "Error in strerror_r()"; \ | |
93 | strerror_r(errno, buf, sizeof(buf)); \ | |
94 | ERRMSG("Error: " call ": %s", ## args, buf); \ | |
95 | } while(0); | |
96 | #else | |
97 | #define PERROR(call, args...)\ | |
98 | do { \ | |
99 | char *buf; \ | |
100 | char tmp[200]; \ | |
101 | buf = strerror_r(errno, tmp, sizeof(tmp)); \ | |
102 | ERRMSG("Error: " call ": %s", ## args, buf); \ | |
103 | } while(0); | |
104 | #endif | |
105 | ||
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) | |
109 | ||
110 | #endif /* _USTERR_SIGNAL_SAFE_H */ |