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glibc/include/stdio.h
Frédéric Bérat 505c884aeb stdio: Ensure *_chk routines have their hidden builtin definition available 
If libc_hidden_builtin_{def,proto} isn't properly set for *_chk routines,
there are unwanted PLT entries in libc.so.

There is a special case with __asprintf_chk:
If ldbl_* macros are used for asprintf, ABI gets broken on s390x,
if it isn't, ppc64le isn't building due to multiple asm redirections.

This is due to the inclusion of bits/stdio-lbdl.h for ppc64le whereas it
isn't for s390x. This header creates redirections, which are not
compatible with the ones generated using libc_hidden_def.
Yet, we can't use libc_hidden_ldbl_proto on s390x since it will not
create a simple strong alias (e.g. as done on x86_64), but a versioned
alias, leading to ABI breakage.

This results in errors on s390x:
/usr/bin/ld: glibc/iconv/../libio/bits/stdio2.h:137: undefined reference
to `__asprintf_chk'

Original __asprintf_chk symbols:
00000000001395b0 T __asprintf_chk
0000000000177e90 T __nldbl___asprintf_chk

__asprintf_chk symbols with ldbl_* macros:
000000000012d590 t ___asprintf_chk
000000000012d590 t __asprintf_chk@@GLIBC_2.4
000000000012d590 t __GI___asprintf_chk
000000000012d590 t __GL____asprintf_chk___asprintf_chk
0000000000172240 T __nldbl___asprintf_chk

__asprintf_chk symbols with the patch:
000000000012d590 t ___asprintf_chk
000000000012d590 T __asprintf_chk
000000000012d590 t __GI___asprintf_chk
0000000000172240 T __nldbl___asprintf_chk

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2023-07-05 16:59:48 +02:00

331 lines
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#ifndef _STDIO_H
# if !defined _ISOMAC && defined _IO_MTSAFE_IO
# include <stdio-lock.h>
# endif
/* Workaround PR90731 with GCC 9 when using ldbl redirects in C++. */
# include <bits/floatn.h>
# if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
# if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
# pragma GCC system_header
# endif
# endif
# include <libio/stdio.h>
# ifndef _ISOMAC
# define _LIBC_STDIO_H 1
# include <libio/libio.h>
/* Now define the internal interfaces. */
/* Some libc_hidden_ldbl_proto's do not map to a unique symbol when
redirecting ldouble to _Float128 variants. We can therefore safely
directly alias them to their internal name. */
# if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc)
# define stdio_hidden_ldbl_proto(p, f) \
extern __typeof (p ## f) p ## f __asm (__ASMNAME ("___ieee128_" #f));
# elif __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
# define stdio_hidden_ldbl_proto(p,f) __LDBL_REDIR1_DECL (p ## f, p ## f ## ieee128)
# else
# define stdio_hidden_ldbl_proto(p,f) libc_hidden_proto (p ## f)
# endif
/* Set the error indicator on FP. */
static inline void
fseterr_unlocked (FILE *fp)
{
fp->_flags |= _IO_ERR_SEEN;
}
extern int __fcloseall (void) attribute_hidden;
extern int __snprintf (char *__restrict __s, size_t __maxlen,
const char *__restrict __format, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
stdio_hidden_ldbl_proto (__, snprintf)
extern int __vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 2, 0)));
libc_hidden_proto (__vfscanf)
extern int __vscanf (const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 1, 0)));
extern __ssize_t __getline (char **__lineptr, size_t *__n,
FILE *__stream) attribute_hidden;
extern int __vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 2, 0)));
extern int __sprintf_chk (char *, int, size_t, const char *, ...) __THROW;
extern int __snprintf_chk (char *, size_t, int, size_t, const char *, ...)
__THROW;
extern int __vsprintf_chk (char *, int, size_t, const char *,
__gnuc_va_list) __THROW;
extern int __vsnprintf_chk (char *, size_t, int, size_t, const char *,
__gnuc_va_list) __THROW;
extern int __printf_chk (int, const char *, ...);
extern int __fprintf_chk (FILE *, int, const char *, ...);
extern int __vprintf_chk (int, const char *, __gnuc_va_list);
extern int __vfprintf_chk (FILE *, int, const char *, __gnuc_va_list);
extern char *__fgets_unlocked_chk (char *buf, size_t size, int n, FILE *fp);
extern char *__fgets_chk (char *buf, size_t size, int n, FILE *fp);
extern int __asprintf_chk (char **, int, const char *, ...) __THROW;
extern int __vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW;
extern int __dprintf_chk (int, int, const char *, ...);
extern int __vdprintf_chk (int, int, const char *, __gnuc_va_list);
extern int __obstack_printf_chk (struct obstack *, int, const char *, ...)
__THROW;
extern int __obstack_vprintf_chk (struct obstack *, int, const char *,
__gnuc_va_list) __THROW;
extern int __isoc99_fscanf (FILE *__restrict __stream,
const char *__restrict __format, ...) __wur;
extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
extern int __isoc99_sscanf (const char *__restrict __s,
const char *__restrict __format, ...) __THROW;
extern int __isoc99_vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc99_vscanf (const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc99_vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __THROW;
extern int __isoc23_fscanf (FILE *__restrict __stream,
const char *__restrict __format, ...) __wur;
extern int __isoc23_scanf (const char *__restrict __format, ...) __wur;
extern int __isoc23_sscanf (const char *__restrict __s,
const char *__restrict __format, ...) __THROW;
extern int __isoc23_vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc23_vscanf (const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc23_vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __THROW;
libc_hidden_proto (__isoc99_sscanf)
libc_hidden_proto (__isoc99_vsscanf)
libc_hidden_proto (__isoc99_vfscanf)
libc_hidden_proto (__isoc23_sscanf)
libc_hidden_proto (__isoc23_vsscanf)
libc_hidden_proto (__isoc23_vfscanf)
/* Internal uses of sscanf should call the C2X-compliant version.
Unfortunately, symbol redirection is not transitive, so the
__REDIRECT in the public header does not link up with the above
libc_hidden_proto. Bridge the gap with a macro. */
# if !__GLIBC_USE (DEPRECATED_SCANF)
# undef sscanf
# define sscanf __isoc23_sscanf
# endif
# if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc)
/* These are implemented as redirects to other public API.
Therefore, the usual redirection fails to avoid PLT. */
extern __typeof (__isoc99_sscanf) ___ieee128_isoc99_sscanf __THROW;
extern __typeof (__isoc99_vsscanf) ___ieee128_isoc99_vsscanf __THROW;
extern __typeof (__isoc99_vfscanf) ___ieee128_isoc99_vfscanf __THROW;
extern __typeof (__isoc23_sscanf) ___ieee128_isoc23_sscanf __THROW;
extern __typeof (__isoc23_vsscanf) ___ieee128_isoc23_vsscanf __THROW;
extern __typeof (__isoc23_vfscanf) ___ieee128_isoc23_vfscanf __THROW;
libc_hidden_proto (___ieee128_isoc99_sscanf)
libc_hidden_proto (___ieee128_isoc99_vsscanf)
libc_hidden_proto (___ieee128_isoc99_vfscanf)
libc_hidden_proto (___ieee128_isoc23_sscanf)
libc_hidden_proto (___ieee128_isoc23_vsscanf)
libc_hidden_proto (___ieee128_isoc23_vfscanf)
#define __isoc99_sscanf ___ieee128_isoc99_sscanf
#define __isoc99_vsscanf ___ieee128_isoc99_vsscanf
#define __isoc99_vfscanf ___ieee128_isoc99_vfscanf
#define __isoc23_sscanf ___ieee128_isoc23_sscanf
#define __isoc23_vsscanf ___ieee128_isoc23_vsscanf
#define __isoc23_vfscanf ___ieee128_isoc23_vfscanf
# endif
/* Prototypes for compatibility functions. */
extern FILE *__new_tmpfile (void);
extern FILE *__old_tmpfile (void);
# define __need_size_t
# include <stddef.h>
# include <bits/types/wint_t.h>
/* Generate a unique file name (and possibly open it). */
extern int __path_search (char *__tmpl, size_t __tmpl_len,
const char *__dir, const char *__pfx,
int __try_tempdir) attribute_hidden;
extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags,
int __kind) attribute_hidden;
/* The __kind argument to __gen_tempname may be one of: */
# define __GT_FILE 0 /* create a file */
# define __GT_DIR 1 /* create a directory */
# define __GT_NOCREATE 2 /* just find a name not currently in use */
/* Print out MESSAGE (which should end with a newline) on the error output
and abort. */
extern void __libc_fatal (const char *__message)
__attribute__ ((__noreturn__));
_Noreturn void __libc_message (const char *__fnt, ...) attribute_hidden;
extern void __fortify_fail (const char *msg) __attribute__ ((__noreturn__));
libc_hidden_proto (__fortify_fail)
/* Acquire ownership of STREAM. */
extern void __flockfile (FILE *__stream) attribute_hidden;
/* Relinquish the ownership granted for STREAM. */
extern void __funlockfile (FILE *__stream) attribute_hidden;
/* Try to acquire ownership of STREAM but do not block if it is not
possible. */
extern int __ftrylockfile (FILE *__stream);
extern int __getc_unlocked (FILE *__fp) attribute_hidden;
extern wint_t __getwc_unlocked (FILE *__fp);
extern int __fxprintf (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
extern int __fxprintf_nocancel (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
int __vfxprintf (FILE *__fp, const char *__fmt, __gnuc_va_list,
unsigned int)
attribute_hidden;
extern const char *const _sys_errlist_internal[] attribute_hidden;
extern const size_t _sys_errlist_internal_len attribute_hidden;
extern const char *__get_errlist (int) attribute_hidden;
extern const char *__get_errname (int) attribute_hidden;
libc_hidden_ldbl_proto (__asprintf)
# if IS_IN (libc)
extern FILE *_IO_new_fopen (const char*, const char*);
# define fopen(fname, mode) _IO_new_fopen (fname, mode)
extern FILE *_IO_new_fdopen (int, const char*);
# define fdopen(fd, mode) _IO_new_fdopen (fd, mode)
extern int _IO_new_fclose (FILE*);
# define fclose(fp) _IO_new_fclose (fp)
extern int _IO_fputs (const char*, FILE*);
libc_hidden_proto (_IO_fputs)
/* The compiler may optimize calls to fprintf into calls to fputs.
Use libc_hidden_proto to ensure that those calls, not redirected by
the fputs macro, also do not go through the PLT. */
libc_hidden_proto (fputs)
# define fputs(str, fp) _IO_fputs (str, fp)
extern int _IO_new_fsetpos (FILE *, const __fpos_t *);
# define fsetpos(fp, posp) _IO_new_fsetpos (fp, posp)
extern int _IO_new_fgetpos (FILE *, __fpos_t *);
# define fgetpos(fp, posp) _IO_new_fgetpos (fp, posp)
# endif
extern __typeof (dprintf) __dprintf
__attribute__ ((__format__ (__printf__, 2, 3)));
stdio_hidden_ldbl_proto (__, dprintf)
libc_hidden_ldbl_proto (dprintf)
libc_hidden_ldbl_proto (fprintf)
libc_hidden_ldbl_proto (vfprintf)
libc_hidden_ldbl_proto (sprintf)
libc_hidden_proto (ungetc)
libc_hidden_proto (__getdelim)
libc_hidden_proto (fwrite)
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)
extern __typeof (ftello) __ftello;
libc_hidden_proto (__ftello)
extern __typeof (fseeko64) __fseeko64;
libc_hidden_proto (__fseeko64)
extern __typeof (ftello64) __ftello64;
libc_hidden_proto (__ftello64)
libc_hidden_proto (fflush)
libc_hidden_proto (fflush_unlocked)
extern __typeof (fflush_unlocked) __fflush_unlocked;
libc_hidden_proto (__fflush_unlocked)
extern __typeof (fread_unlocked) __fread_unlocked;
libc_hidden_proto (__fread_unlocked)
libc_hidden_proto (fwrite_unlocked)
libc_hidden_proto (fgets_unlocked)
extern __typeof (fgets_unlocked) __fgets_unlocked;
libc_hidden_proto (__fgets_unlocked)
libc_hidden_proto (fputs_unlocked)
extern __typeof (fputs_unlocked) __fputs_unlocked;
libc_hidden_proto (__fputs_unlocked)
libc_hidden_proto (feof_unlocked)
extern __typeof (feof_unlocked) __feof_unlocked attribute_hidden;
libc_hidden_proto (ferror_unlocked)
extern __typeof (ferror_unlocked) __ferror_unlocked attribute_hidden;
libc_hidden_proto (getc_unlocked)
libc_hidden_proto (fputc_unlocked)
libc_hidden_proto (putc_unlocked)
extern __typeof (putc_unlocked) __putc_unlocked attribute_hidden;
libc_hidden_proto (fmemopen)
/* The prototype needs repeating instead of using __typeof to use
__THROW in C++ tests. */
extern FILE *__open_memstream (char **, size_t *) __THROW __wur;
libc_hidden_proto (__open_memstream)
libc_hidden_proto (__libc_fatal)
rtld_hidden_proto (__libc_fatal)
libc_hidden_proto (__fgets_unlocked_chk)
#if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
libc_hidden_ldbl_proto (__asprintf_chk)
#else
libc_hidden_proto (__asprintf_chk)
#endif
libc_hidden_ldbl_proto (__fprintf_chk)
libc_hidden_ldbl_proto (__sprintf_chk)
libc_hidden_ldbl_proto (__vsprintf_chk)
extern FILE * __fmemopen (void *buf, size_t len, const char *mode);
libc_hidden_proto (__fmemopen)
extern int __gen_tempfd (int flags);
libc_hidden_proto (__gen_tempfd)
# ifdef __USE_EXTERN_INLINES
__extern_inline int
__NTH (__feof_unlocked (FILE *__stream))
{
return __feof_unlocked_body (__stream);
}
__extern_inline int
__NTH (__ferror_unlocked (FILE *__stream))
{
return __ferror_unlocked_body (__stream);
}
__extern_inline int
__getc_unlocked (FILE *__fp)
{
return __getc_unlocked_body (__fp);
}
__extern_inline int
__putc_unlocked (int __c, FILE *__stream)
{
return __putc_unlocked_body (__c, __stream);
}
# endif
extern __typeof (renameat) __renameat;
libc_hidden_proto (__renameat)
extern __typeof (renameat2) __renameat2;
libc_hidden_proto (__renameat2)
# endif /* not _ISOMAC */
#endif /* stdio.h */
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