1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/* Copyright (C) 1991, 1994-2002, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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; either
version 2.1 of the License, or (at your option) any later version.
The GNU C 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 the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libintl.h>
#include <bits/libc-lock.h>
/* Defined in siglist.c. */
extern const char *const _sys_siglist[];
extern const char *const _sys_siglist_internal[] attribute_hidden;
static __libc_key_t key;
/* If nonzero the key allocation failed and we should better use a
static buffer than fail. */
#define BUFFERSIZ 100
static char local_buf[BUFFERSIZ];
static char *static_buf;
/* Destructor for the thread-specific data. */
static void init (void);
static void free_key_mem (void *mem);
static char *getbuffer (void);
/* Return a string describing the meaning of the signal number SIGNUM. */
char *
strsignal (int signum)
{
__libc_once_define (static, once);
const char *desc;
/* If we have not yet initialized the buffer do it now. */
__libc_once (once, init);
if (
#ifdef SIGRTMIN
(signum >= SIGRTMIN && signum <= SIGRTMAX) ||
#endif
signum < 0 || signum >= NSIG
|| (desc = INTUSE(_sys_siglist)[signum]) == NULL)
{
char *buffer = getbuffer ();
int len;
#ifdef SIGRTMIN
if (signum >= SIGRTMIN && signum <= SIGRTMAX)
len = __snprintf (buffer, BUFFERSIZ - 1, _("Real-time signal %d"),
signum - SIGRTMIN);
else
#endif
len = __snprintf (buffer, BUFFERSIZ - 1, _("Unknown signal %d"),
signum);
if (len >= BUFFERSIZ)
buffer = NULL;
else
buffer[len] = '\0';
return buffer;
}
return (char *) _(desc);
}
/* Initialize buffer. */
static void
init (void)
{
if (__libc_key_create (&key, free_key_mem))
/* Creating the key failed. This means something really went
wrong. In any case use a static buffer which is better than
nothing. */
static_buf = local_buf;
}
/* Free the thread specific data, this is done if a thread terminates. */
static void
free_key_mem (void *mem)
{
free (mem);
__libc_setspecific (key, NULL);
}
/* Return the buffer to be used. */
static char *
getbuffer (void)
{
char *result;
if (static_buf != NULL)
result = static_buf;
else
{
/* We don't use the static buffer and so we have a key. Use it
to get the thread-specific buffer. */
result = __libc_getspecific (key);
if (result == NULL)
{
/* No buffer allocated so far. */
result = malloc (BUFFERSIZ);
if (result == NULL)
/* No more memory available. We use the static buffer. */
result = local_buf;
else
__libc_setspecific (key, result);
}
}
return result;
}
|
GitWeb