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Make strsignal(3) thread-safe.

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MFC after:	2 weeks
This commit is contained in:
Hajimu UMEMOTO 2010-01-24 10:35:26 +00:00
parent 681ffdf935
commit 4f86602c03
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=202916
1 changed files with 48 additions and 4 deletions
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52
lib/libc/string/strsignal.c
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@ -33,22 +33,64 @@ static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#if defined(NLS)
#include <nl_types.h>
#endif
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include "reentrant.h"
#include "un-namespace.h"
#define UPREFIX "Unknown signal"
static char sig_ebuf[NL_TEXTMAX];
static char sig_ebuf_err[NL_TEXTMAX];
static once_t sig_init_once = ONCE_INITIALIZER;
static thread_key_t sig_key;
static int sig_keycreated = 0;
static void
sig_keycreate(void)
{
sig_keycreated = (thr_keycreate(&sig_key, free) == 0);
}
static char *
sig_tlsalloc(void)
{
char *ebuf = NULL;
if (thr_main() != 0)
ebuf = sig_ebuf;
else {
if (thr_once(&sig_init_once, sig_keycreate) != 0 ||
!sig_keycreated)
goto thr_err;
if ((ebuf = thr_getspecific(sig_key)) == NULL) {
if ((ebuf = malloc(sizeof(sig_ebuf))) == NULL)
goto thr_err;
if (thr_setspecific(sig_key, ebuf) != 0) {
free(ebuf);
ebuf = NULL;
goto thr_err;
}
}
}
thr_err:
if (ebuf == NULL)
ebuf = sig_ebuf_err;
return (ebuf);
}
/* XXX: negative 'num' ? (REGR) */
char *
strsignal(int num)
{
static char ebuf[NL_TEXTMAX];
char *ebuf;
char tmp[20];
size_t n;
int signum;
@ -60,6 +102,8 @@ strsignal(int num)
catd = catopen("libc", NL_CAT_LOCALE);
#endif
ebuf = sig_tlsalloc();
if (num > 0 && num < sys_nsig) {
n = strlcpy(ebuf,
#if defined(NLS)
@ -67,7 +111,7 @@ strsignal(int num)
#else
sys_siglist[num],
#endif
sizeof(ebuf));
sizeof(sig_ebuf));
} else {
n = strlcpy(ebuf,
#if defined(NLS)
@ -75,7 +119,7 @@ strsignal(int num)
#else
UPREFIX,
#endif
sizeof(ebuf));
sizeof(sig_ebuf));
}
signum = num;