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Diffstat (limited to 'REORG.TODO/string/strsignal.c')
-rw-r--r-- | REORG.TODO/string/strsignal.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/REORG.TODO/string/strsignal.c b/REORG.TODO/string/strsignal.c new file mode 100644 index 0000000000..6cb4399934 --- /dev/null +++ b/REORG.TODO/string/strsignal.c @@ -0,0 +1,125 @@ +/* Copyright (C) 1991-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <libintl.h> +#include <libc-lock.h> + +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 = _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; +} |