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string: Implement strerror in terms of strerror_l

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If the thread is terminated then __libc_thread_freeres will free the
storage via __glibc_tls_internal_free.

It is only within the calling thread that this matters.  It makes
strerror MT-safe.

Checked on x86-64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
and s390x-linux-gnu.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella
2020-05-14 17:44:15 -03:00
parent 9deec7c8ba
commit 28aff04781
5 changed files with 24 additions and 26 deletions
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22
string/strerror.c
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@@ -15,29 +15,11 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <libintl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
/* Return a string describing the errno code in ERRNUM.
The storage is good only until the next call to strerror.
Writing to the storage causes undefined behavior. */
libc_freeres_ptr (static char *buf);
#include <locale/localeinfo.h>
char *
strerror (int errnum)
{
char *ret = __strerror_r (errnum, NULL, 0);
int saved_errno;
if (__glibc_likely (ret != NULL))
return ret;
saved_errno = errno;
if (buf == NULL)
buf = malloc (1024);
__set_errno (saved_errno);
if (buf == NULL)
return _("Unknown error");
return __strerror_r (errnum, buf, 1024);
return __strerror_l (errnum, __libc_tsd_get (locale_t, LOCALE));
}