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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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15
string/strerror_l.c
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@@ -20,8 +20,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <libc-symbols.h>
#include <errno.h>
static __thread char *last_value;
@@ -38,8 +37,9 @@ translate (const char *str, locale_t loc)
/* Return a string describing the errno code in ERRNUM. */
char *
strerror_l (int errnum, locale_t loc)
__strerror_l (int errnum, locale_t loc)
{
int saved_errno = errno;
char *err = (char *) __get_errlist (errnum);
if (__glibc_unlikely (err == NULL))
{
@@ -48,11 +48,16 @@ strerror_l (int errnum, locale_t loc)
translate ("Unknown error ", loc), errnum) == -1)
last_value = NULL;
return last_value;
err = last_value;
}
else
err = (char *) translate (err, loc);
return (char *) translate (err, loc);
__set_errno (saved_errno);
return err;
}
weak_alias (__strerror_l, strerror_l)
libc_hidden_def (__strerror_l)
void
__strerror_thread_freeres (void)