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-rw-r--r--string/strsignal.c93
1 files changed, 86 insertions, 7 deletions
diff --git a/string/strsignal.c b/string/strsignal.c
index 69629b7..41585dc 100644
--- a/string/strsignal.c
+++ b/string/strsignal.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 94, 95, 96, 97, 98 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
@@ -18,7 +18,9 @@
#include <signal.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
+#include <bits/libc-lock.h>
#ifndef HAVE_GNU_LD
@@ -27,23 +29,100 @@
/* Defined in siglist.c. */
extern const char *const _sys_siglist[];
+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 (signum < 0 || signum > NSIG || (desc = _sys_siglist[signum]) == NULL)
+ /* 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)
{
- static char buf[512];
- int len = __snprintf (buf, sizeof buf, _("Unknown signal %d"), signum);
+ char *buffer = getbuffer ();
+ int len = __snprintf (buffer, BUFFERSIZ - 1,
+#ifdef SIGRTMIN
+ signum >= SIGRTMIN && signum <= SIGRTMAX
+ ? _("Real-time signal %d") :
+#endif
+ _("Unknown signal %d"), signum);
if (len < 0)
- return NULL;
- buf[len - 1] = '\0';
- return buf;
+ 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;
+}