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Diffstat (limited to 'lib/strsignal.c')
| -rw-r--r-- | lib/strsignal.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/lib/strsignal.c b/lib/strsignal.c new file mode 100644 index 0000000000..2496e2ca44 --- /dev/null +++ b/lib/strsignal.c @@ -0,0 +1,196 @@ +/* Copyright (C) 1991, 1994-2002, 2005, 2008 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. */ + +#ifndef _LIBC +# include <config.h> +#endif + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#ifdef _LIBC +# include <libintl.h> +#else /* !_LIBC */ +# include "gettext.h" +# define _(msgid) gettext (msgid) +# define N_(msgid) gettext_noop (msgid) +#endif /* _LIBC */ + +#ifdef _LIBC +# include <bits/libc-lock.h> +#else /* !_LIBC */ +# include "lock.h" +# include "tls.h" +# define __libc_once_define(CLASS, NAME) gl_once_define (CLASS, NAME) +# define __libc_once(NAME, INIT) gl_once ((NAME), (INIT)) +# define __libc_key_t gl_tls_key_t +# define __libc_getspecific(NAME) gl_tls_get ((NAME)) +# define __libc_setspecific(NAME, POINTER) gl_tls_set ((NAME), (POINTER)) +# define __snprintf snprintf +#endif /* _LIBC */ + +#ifdef _LIBC + +/* Defined in siglist.c. */ +extern const char *const _sys_siglist[]; +extern const char *const _sys_siglist_internal[] attribute_hidden; + +#else /* !_LIBC */ + +/* NetBSD declares sys_siglist in unistd.h. */ +# include <unistd.h> + +# define INTUSE(x) (x) + +# if HAVE_DECL_SYS_SIGLIST +# undef _sys_siglist +# define _sys_siglist sys_siglist +# else /* !HAVE_DECL_SYS_SIGLIST */ +# ifndef NSIG +# define NSIG 32 +# endif /* NSIG */ +static const char *_sys_siglist[NSIG]; +# endif /* !HAVE_DECL_SYS_SIGLIST */ + +#endif /* _LIBC */ + +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) +{ + const char *desc; + __libc_once_define (static, once); + + /* 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) +{ +#ifdef _LIBC + 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; +#else /* !_LIBC */ + gl_tls_key_init (key, free_key_mem); + +# if !HAVE_DECL_SYS_SIGLIST + memset (_sys_siglist, 0, NSIG * sizeof *_sys_siglist); + + /* No need to use a do {} while (0) here since init_sig(...) must expand + to a complete statement. (We cannot use the ISO C99 designated array + initializer syntax since it is not supported by ANSI C compilers and + since some signal numbers might exceed NSIG.) */ +# define init_sig(sig, abbrev, desc) \ + if (sig >= 0 && sig < NSIG) \ + _sys_siglist[sig] = desc; +} while (0); + +# include "siglist.h" + +# undef init_sig + +# endif /* !HAVE_DECL_SYS_SIGLIST */ +#endif /* !_LIBC */ +} + + +/* 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; +} |