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74015205 | 1 | /* Copyright (C) 1991, 94, 95, 96, 97, 98 Free Software Foundation, Inc. |
c84142e8 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
28f540f4 RM |
19 | #include <signal.h> |
20 | #include <stdio.h> | |
74015205 | 21 | #include <stdlib.h> |
28f540f4 | 22 | #include <string.h> |
74015205 | 23 | #include <bits/libc-lock.h> |
28f540f4 RM |
24 | |
25 | ||
26 | #ifndef HAVE_GNU_LD | |
27 | #define _sys_siglist sys_siglist | |
28 | #endif | |
29 | ||
f2149f69 | 30 | /* Defined in siglist.c. */ |
46ec036d | 31 | extern const char *const _sys_siglist[]; |
74015205 UD |
32 | static __libc_key_t key; |
33 | ||
34 | /* If nonzero the key allocation failed and we should better use a | |
35 | static buffer than fail. */ | |
36 | #define BUFFERSIZ 100 | |
37 | static char local_buf[BUFFERSIZ]; | |
38 | static char *static_buf; | |
39 | ||
40 | /* Destructor for the thread-specific data. */ | |
41 | static void init (void); | |
42 | static void free_key_mem (void *mem); | |
43 | static char *getbuffer (void); | |
28f540f4 RM |
44 | |
45 | ||
46 | /* Return a string describing the meaning of the signal number SIGNUM. */ | |
47 | char * | |
46ec036d | 48 | strsignal (int signum) |
28f540f4 | 49 | { |
74015205 | 50 | __libc_once_define (static, once); |
46ec036d UD |
51 | const char *desc; |
52 | ||
74015205 UD |
53 | /* If we have not yet initialized the buffer do it now. */ |
54 | __libc_once (once, init); | |
55 | ||
56 | if ( | |
57 | #ifdef SIGRTMIN | |
58 | (signum >= SIGRTMIN && signum <= SIGRTMAX) || | |
59 | #endif | |
60 | signum < 0 || signum > NSIG || (desc = _sys_siglist[signum]) == NULL) | |
28f540f4 | 61 | { |
74015205 UD |
62 | char *buffer = getbuffer (); |
63 | int len = __snprintf (buffer, BUFFERSIZ - 1, | |
64 | #ifdef SIGRTMIN | |
65 | signum >= SIGRTMIN && signum <= SIGRTMAX | |
66 | ? _("Real-time signal %d") : | |
67 | #endif | |
68 | _("Unknown signal %d"), signum); | |
b3a59f40 | 69 | if (len < 0) |
74015205 UD |
70 | buffer = NULL; |
71 | else | |
72 | buffer[len] = '\0'; | |
73 | ||
74 | return buffer; | |
28f540f4 RM |
75 | } |
76 | ||
46ec036d | 77 | return (char *) _(desc); |
28f540f4 | 78 | } |
74015205 UD |
79 | |
80 | ||
81 | /* Initialize buffer. */ | |
82 | static void | |
83 | init (void) | |
84 | { | |
85 | if (__libc_key_create (&key, free_key_mem)) | |
86 | /* Creating the key failed. This means something really went | |
87 | wrong. In any case use a static buffer which is better than | |
88 | nothing. */ | |
89 | static_buf = local_buf; | |
90 | } | |
91 | ||
92 | ||
93 | /* Free the thread specific data, this is done if a thread terminates. */ | |
94 | static void | |
95 | free_key_mem (void *mem) | |
96 | { | |
97 | free (mem); | |
98 | __libc_setspecific (key, NULL); | |
99 | } | |
100 | ||
101 | ||
102 | /* Return the buffer to be used. */ | |
103 | static char * | |
104 | getbuffer (void) | |
105 | { | |
106 | char *result; | |
107 | ||
108 | if (static_buf != NULL) | |
109 | result = static_buf; | |
110 | else | |
111 | { | |
112 | /* We don't use the static buffer and so we have a key. Use it | |
113 | to get the thread-specific buffer. */ | |
114 | result = __libc_getspecific (key); | |
115 | if (result == NULL) | |
116 | { | |
117 | /* No buffer allocated so far. */ | |
118 | result = malloc (BUFFERSIZ); | |
119 | if (result == NULL) | |
120 | /* No more memory available. We use the static buffer. */ | |
121 | result = local_buf; | |
122 | else | |
123 | __libc_setspecific (key, result); | |
124 | } | |
125 | } | |
126 | ||
127 | return result; | |
128 | } |