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Fix __get_nprocs fgets_unlocked namespace (bug 17582).

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__get_nprocs is called from malloc code, but calls fgets_unlocked,
which is not an ISO C or POSIX function.  This patch fixes it to call
a new __fgets_unlocked name instead.

Note: there are various other uses of fgets_unlocked in glibc's
libraries, and I haven't yet investigated which others might also be
problematic (called directly or indirectly from standard functions)
and so need to change to use __fgets_unlocked.

Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by the patch).

	[BZ #17582]
	* libio/iofgets.c [weak_alias && !_IO_MTSAFE_IO]
	(__fgets_unlocked): Add alias of _IO_fgets.  Use libc_hidden_def.
	* libio/iofgets_u.c (fgets_unlocked): Rename to __fgets_unlocked
	and define as weak alias of __fgets_unlocked.  Use
	libc_hidden_weak.
	(__fgets_unlocked): Use libc_hidden_def.
	* include/stdio.h (__fgets_unlocked): Declare.  Use
	libc_hidden_proto.
	* sysdeps/unix/sysv/linux/getsysstats.c (phys_pages_info): Use
	__fgets_unlocked instead of fgets_unlocked.
	* sysdeps/unix/sysv/linux/alpha/getsysstats.c
	(GET_NPROCS_CONF_PARSER): Likewise.
	* sysdeps/unix/sysv/linux/sparc/getsysstats.c
	(GET_NPROCS_CONF_PARSER): Likewise.
This commit is contained in:
Joseph Myers
2014-11-12 22:39:36 +00:00
parent 01cad84e19
commit c4eae75271
8 changed files with 28 additions and 6 deletions
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2
include/stdio.h
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@ -155,6 +155,8 @@ 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)
libc_hidden_proto (fmemopen)
libc_hidden_proto (open_memstream)