[Bug stdio/29126] New: libio: _IO_MTSAFE_IO is not assumed on some places

[Bug stdio/29126] New: libio: _IO_MTSAFE_IO is not assumed on some places

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29126

            Bug ID: 29126
           Summary: libio: _IO_MTSAFE_IO is not assumed on some places
           Product: glibc
           Version: 2.36
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: adhemerval.zanella at linaro dot org
  Target Milestone: ---

The libio/libio.h defines internal macros to optimize _IO_peekc, _IO_flockfile,
and_IO_funlockfile. However, it only defines it to check for lock if
_IO_MTSAFE_IO is defined.

Some file does not set _IO_MTSAFE_IO (for instance malloc.c and putgrent.c)
which makes stdio stream usage wrong regarding locking (since
_IO_flockfile/_IO_funlockfile will be empty definitions).

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[Bug stdio/29126] libio: _IO_MTSAFE_IO is not assumed on some places

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29126

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
grp/Makefile:CFLAGS-putgrent.c += -fexceptions $(libio-mtsafe)

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[Bug stdio/29126] libio: _IO_MTSAFE_IO is not assumed on some places

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29126

--- Comment #2 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
(In reply to Andreas Schwab from comment #1)
> grp/Makefile:CFLAGS-putgrent.c += -fexceptions $(libio-mtsafe)

Indeed, I haven't checked all the code that is affected by the missing
_IO_MTSAFE_IO. In any case my intended fix to assume _IO_MTSAFE_IO.

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