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Fix tzfile.c namespace (bug 17583).

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tzfile.c is brought in by various ISO C functions, but calls fileno,
fread_unlocked and ftello, which are not ISO C functions.  This patch
adds names __fileno, __fread_unlocked and __ftello for those
functions, making tzfile.c use those new names.

Note: there are various uses of fileno elsewhere in glibc that I
didn't change, although it may turn out that some of those also need
to use __fileno.

Tested for x86_64 with the glibc testsuite.  Changed line numbers in
tzfile.c cause changes in assertions, and for some reason this ends up
with different instruction choice and register allocation, affecting
the size of __tzfile_read and so making comparison of disassembly for
libc.so problematic.

	[BZ #17583]
	* libio/fileno.c (fileno): Rename to __fileno and define as weak
	alias of __fileno.  Use libc_hidden_weak.
	(__fileno): Use libc_hidden_def.
	[weak_alias] (fileno_unlocked): Define as weak alias of __fileno.
	* libio/ftello.c (ftello): Rename to __ftello and define as weak
	alias of __ftello.
	[__OFF_T_MATCHES_OFF64_T] (ftello64): Define as weak alias of
	__ftello.
	* libio/iofread.c [weak_alias && !_IO_MTSAFE_IO]
	(__fread_unlocked): Define as strong alias of _IO_fread.  Use
	libc_hidden_def.
	(fread_unlocked): Don't use libc_hidden_ver.
	* libio/iofread_u.c (fread_unlocked): Rename to __fread_unlocked
	and define as weak alias of __fread_unlocked.  Don't use
	libc_hidden_def.
	(__fread_unlocked): Use libc_hidden_def.
	* include/stdio.h (__fileno): Declare.  Use libc_hidden_proto.
	(ftello): Don't use libc_hidden_proto.
	(__ftello): Declare.  Use libc_hidden_proto.
	(fread_unlocked): Don't use libc_hidden_proto.
	(__fread_unlocked): Declare.  Use libc_hidden_proto.
	* time/tzfile.c (__tzfile_read): Use __fileno, __fread_unlocked
	and __ftello instead of fileno, fread_unlocked and ftello.
This commit is contained in:
Joseph Myers 2014-11-12 16:22:51 +00:00
parent 2581b98ecb
commit 5a6fa4d7ed
8 changed files with 69 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
ChangeLog
View File

@ -1,3 +1,30 @@
2014-11-12 Joseph Myers <joseph@codesourcery.com>
[BZ #17583]
* libio/fileno.c (fileno): Rename to __fileno and define as weak
alias of __fileno. Use libc_hidden_weak.
(__fileno): Use libc_hidden_def.
[weak_alias] (fileno_unlocked): Define as weak alias of __fileno.
* libio/ftello.c (ftello): Rename to __ftello and define as weak
alias of __ftello.
[__OFF_T_MATCHES_OFF64_T] (ftello64): Define as weak alias of
__ftello.
* libio/iofread.c [weak_alias && !_IO_MTSAFE_IO]
(__fread_unlocked): Define as strong alias of _IO_fread. Use
libc_hidden_def.
(fread_unlocked): Don't use libc_hidden_ver.
* libio/iofread_u.c (fread_unlocked): Rename to __fread_unlocked
and define as weak alias of __fread_unlocked. Don't use
libc_hidden_def.
(__fread_unlocked): Use libc_hidden_def.
* include/stdio.h (__fileno): Declare. Use libc_hidden_proto.
(ftello): Don't use libc_hidden_proto.
(__ftello): Declare. Use libc_hidden_proto.
(fread_unlocked): Don't use libc_hidden_proto.
(__fread_unlocked): Declare. Use libc_hidden_proto.
* time/tzfile.c (__tzfile_read): Use __fileno, __fread_unlocked
and __ftello instead of fileno, fread_unlocked and ftello.
2012-11-12 Siddhesh Poyarekar <siddhesh@redhat.com>
* sysdeps/s390/s390-32/bcopy.S (__bcopy): Use GOT instead of

2
NEWS
View File

@ -11,7 +11,7 @@ Version 2.21
6652, 12926, 14132, 14138, 14171, 15215, 15884, 17266, 17344, 17363,
17370, 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522,
17555.
17555, 17583.
* New locales: tu_IN, bh_IN.

8
include/stdio.h
View File

@ -143,12 +143,16 @@ libc_hidden_proto (perror)
libc_hidden_proto (remove)
libc_hidden_proto (rewind)
libc_hidden_proto (fileno)
extern __typeof (fileno) __fileno;
libc_hidden_proto (__fileno)
libc_hidden_proto (fwrite)
libc_hidden_proto (fseek)
libc_hidden_proto (ftello)
extern __typeof (ftello) __ftello;
libc_hidden_proto (__ftello)
libc_hidden_proto (fflush)
libc_hidden_proto (fflush_unlocked)
libc_hidden_proto (fread_unlocked)
extern __typeof (fread_unlocked) __fread_unlocked;
libc_hidden_proto (__fread_unlocked)
libc_hidden_proto (fwrite_unlocked)
libc_hidden_proto (fgets_unlocked)
libc_hidden_proto (fputs_unlocked)

8
libio/fileno.c
View File

@ -28,7 +28,7 @@
#include <stdio.h>
int
fileno (fp)
__fileno (fp)
_IO_FILE* fp;
{
CHECK_FILE (fp, EOF);
@ -41,12 +41,14 @@ fileno (fp)
return _IO_fileno (fp);
}
libc_hidden_def (fileno)
libc_hidden_def (__fileno)
weak_alias (__fileno, fileno)
libc_hidden_weak (fileno)
#ifdef weak_alias
/* The fileno implementation for libio does not require locking because
it only accesses once a single variable and this is already atomic
(at least at thread level). Therefore we don't test _IO_MTSAFE_IO here. */
weak_alias (fileno, fileno_unlocked)
weak_alias (__fileno, fileno_unlocked)
#endif

7
libio/ftello.c
View File

@ -31,7 +31,7 @@
off_t
ftello (fp)
__ftello (fp)
_IO_FILE *fp;
{
_IO_off64_t pos;
@ -61,8 +61,9 @@ ftello (fp)
}
return pos;
}
libc_hidden_def (ftello)
libc_hidden_def (__ftello)
weak_alias (__ftello, ftello)
#ifdef __OFF_T_MATCHES_OFF64_T
weak_alias (ftello, ftello64)
weak_alias (__ftello, ftello64)
#endif

3
libio/iofread.c
View File

@ -49,7 +49,8 @@ libc_hidden_def (_IO_fread)
weak_alias (_IO_fread, fread)
# ifndef _IO_MTSAFE_IO
strong_alias (_IO_fread, __fread_unlocked)
libc_hidden_def (__fread_unlocked)
weak_alias (_IO_fread, fread_unlocked)
libc_hidden_ver (_IO_fread, fread_unlocked)
# endif
#endif

5
libio/iofread_u.c
View File

@ -30,7 +30,7 @@
#undef fread_unlocked
_IO_size_t
fread_unlocked (buf, size, count, fp)
__fread_unlocked (buf, size, count, fp)
void *buf;
_IO_size_t size;
_IO_size_t count;
@ -44,4 +44,5 @@ fread_unlocked (buf, size, count, fp)
bytes_read = _IO_sgetn (fp, (char *) buf, bytes_requested);
return bytes_requested == bytes_read ? count : bytes_read / size;
}
libc_hidden_def (fread_unlocked)
libc_hidden_def (__fread_unlocked)
weak_alias (__fread_unlocked, fread_unlocked)

33
time/tzfile.c
View File

@ -170,7 +170,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
goto ret_free_transitions;
/* Get information about the file we are actually using. */
if (fstat64 (fileno (f), &st) != 0)
if (fstat64 (__fileno (f), &st) != 0)
{
fclose (f);
goto ret_free_transitions;
@ -188,7 +188,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
__fsetlocking (f, FSETLOCKING_BYCALLER);
read_again:
if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead),
if (__builtin_expect (__fread_unlocked ((void *) &tzhead, sizeof (tzhead),
1, f) != 1, 0)
|| memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) != 0)
goto lose;
@ -248,7 +248,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
tzspec_len = 0;
if (sizeof (time_t) == 8 && trans_width == 8)
{
off_t rem = st.st_size - ftello (f);
off_t rem = st.st_size - __ftello (f);
if (__builtin_expect (rem < 0
|| (size_t) rem < (num_transitions * (8 + 1)
+ num_types * 6
@ -293,16 +293,17 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
if (sizeof (time_t) == 4 || __builtin_expect (trans_width == 8, 1))
{
if (__builtin_expect (fread_unlocked (transitions, trans_width + 1,
if (__builtin_expect (__fread_unlocked (transitions, trans_width + 1,
num_transitions, f)
!= num_transitions, 0))
goto lose;
}
else
{
if (__builtin_expect (fread_unlocked (transitions, 4, num_transitions, f)
if (__builtin_expect (__fread_unlocked (transitions, 4,
num_transitions, f)
!= num_transitions, 0)
|| __builtin_expect (fread_unlocked (type_idxs, 1, num_transitions,
|| __builtin_expect (__fread_unlocked (type_idxs, 1, num_transitions,
f) != num_transitions, 0))
goto lose;
}
@ -337,7 +338,8 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
{
unsigned char x[4];
int c;
if (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x),
if (__builtin_expect (__fread_unlocked (x, 1,
sizeof (x), f) != sizeof (x),
0))
goto lose;
c = getc_unlocked (f);
@ -352,13 +354,13 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
types[i].offset = (long int) decode (x);
}
if (__glibc_unlikely (fread_unlocked (zone_names, 1, chars, f) != chars))
if (__glibc_unlikely (__fread_unlocked (zone_names, 1, chars, f) != chars))
goto lose;
for (i = 0; i < num_leaps; ++i)
{
unsigned char x[8];
if (__builtin_expect (fread_unlocked (x, 1, trans_width, f)
if (__builtin_expect (__fread_unlocked (x, 1, trans_width, f)
!= trans_width, 0))
goto lose;
if (sizeof (time_t) == 4 || trans_width == 4)
@ -366,7 +368,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
else
leaps[i].transition = (time_t) decode64 (x);
if (__glibc_unlikely (fread_unlocked (x, 1, 4, f) != 4))
if (__glibc_unlikely (__fread_unlocked (x, 1, 4, f) != 4))
goto lose;
leaps[i].change = (long int) decode (x);
}
@ -396,7 +398,7 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
{
/* Skip over the newline first. */
if (getc_unlocked (f) != '\n'
|| (fread_unlocked (tzspec, 1, tzspec_len - 1, f)
|| (__fread_unlocked (tzspec, 1, tzspec_len - 1, f)
!= tzspec_len - 1))
tzspec = NULL;
else
@ -405,8 +407,8 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
else if (sizeof (time_t) == 4 && tzhead.tzh_version[0] != '\0')
{
/* Get the TZ string. */
if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead),
1, f) != 1, 0)
if (__builtin_expect (__fread_unlocked ((void *) &tzhead,
sizeof (tzhead), 1, f) != 1, 0)
|| (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic))
!= 0))
goto lose;
@ -427,14 +429,15 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
+ num_isgmt2);
off_t off;
if (fseek (f, to_skip, SEEK_CUR) != 0
|| (off = ftello (f)) < 0
|| (off = __ftello (f)) < 0
|| st.st_size < off + 2)
goto lose;
tzspec_len = st.st_size - off - 1;
char *tzstr = alloca (tzspec_len);
if (getc_unlocked (f) != '\n'
|| (fread_unlocked (tzstr, 1, tzspec_len - 1, f) != tzspec_len - 1))
|| (__fread_unlocked (tzstr, 1, tzspec_len - 1, f)
!= tzspec_len - 1))
goto lose;
tzstr[tzspec_len - 1] = '\0';
tzspec = __tzstring (tzstr);